Read 505244j text version

E2010 Lennox Industries Inc. Dallas, Texas, USA

INSTALLATION INSTRUCTIONS

XP14 Elite® Series Units

HEAT PUMP UNITS

505,244M 03/10 Supersedes 10/09

Litho U.S.A.

Table of Contents

XP14 Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . Unit Dimensions and Parts Arrangement . . . . . . . . . General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Flushing Existing Line Set and Indoor Coil . . . . . . . . Refrigerant Metering Device . . . . . . . . . . . . . . . . . . . . Manifold Gauge Set . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Indoor Airflow before Charging . . . . . . . . . . . . Setup for Checking and Adding Charge . . . . . . . . . . Weigh in Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Subcooling Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defrost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Start-up and Performance Checklist . . . . . . . . . . . . . . 1 1 2 3 3 5 6 8 10 11 12 12 13 13 14 14 14 15 15 15 19 24 24 26

RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a qualified installer or service agency.

CAUTION

Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HFCs, and HCFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

XP14 Outdoor Unit

The XP14 outdoor unit uses HFC-410A HFC refrigerant. This unit must be installed with a matching indoor blower coil and line set as outlined in the Lennox Engineering Handbook. Elite® Series XP14 outdoor units are designed for use in check expansion valve (CTXV) systems only and are not to be used with other refrigerant flow control devices. An expansion valve approved for use with HFC-410A must be ordered separately and installed prior to operating the unit.

IMPORTANT

This unit must be matched with an indoor coil as specified in Lennox' Engineering Handbook. Coils previously charged with HCFC-22 must be flushed.

Shipping and Packing List

1 - Assembled XP14 outdoor unit Check the unit components for shipping damage. If you find any damage, immediately contact the last carrier.

*2P0310*

03/10

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*P505244M*

505,244M

Unit Dimensions - Inches (mm) and Parts Arrangement

RUN CAPACITOR DEFROST BOARD CONTACTOR REVERSING VALVE FILTER DRIER/ LIQUID LINE CONNECTIONS

OUTDOOR FAN COMPRESSOR HIGH PRESSURE SWITCH VAPOR LINE VAPOR VALVE AND GAUGE PORT/SUCTION LINE CONNECTIONS

SUCTION LINE CONNECTION LIQUID LINE CONNECTION

TOP VIEW

C DISCHARGE AIR

PARTS ARRANGEMENT

B

LIQUID LINE CONNECTION ELECTRICAL INLETS VAPOR LINE CONNECTION

2 (51) 4-1/4( 108) 4-3/4 (121) 1 (25)

A

SIDE VIEW

UNIT SUPPORT FEET

SIDE VIEW

UNIT SUPPORT FEET

8-1/2 (216)

9-1/2 (241)

16-7/8 (429)

26-7/8 (683)

8-3/4 (222)

8-1/4 (210)

8-3/4 (222) 3-1/8 (79)

3-3/4 (95) 30-3/4 (781) 4-5/8 (117)

5-1/2 (140)

13-1/2 (343)

XP14-018 TO -030 BASE SECTION

Model No.

XP14-018 XP14-024 XP14-030 XP14-036 XP14-042 XP14-048 XP14-060

XP14-036 TO -060 BASE WITH ELONGATED LEGS

B

27 (686) 27 (686) 27 (686) 35 1/2 (902) 35 1/2 (902) 35 1/2 (902) 35 1/2 (902)

A

31 (787) 31 (787) 35 (889) 31 (787) 39 (991) 39 (991) 45 (1143)

C

28 (711) 28 (711) 28 (711) 39 1/2 (1003) 39 1/2 (1003) 39 1/2 (1003) 39 1/2 (1003)

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WARNING

Product contains fiberglass wool. Disturbing the insulation of this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is know to the State of California to cause cancer.) Fiberglass wool may also cause respiratory, skin and eye irritation. To reduce exposure to this substance or for further information, consult material safety data sheets available from address show below, or contact your supervisor. Lennox Industries Inc., PO Box 79011, Dallas, TX 75379-9011

4. Locate the unit so prevailing winter winds will not blow into the coil. 5. Locate unit away from overhanging roof lines which would allow water or ice to drop on, or in front of, coil or into unit.

General Information

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 1 shows torque values for fasteners. Table 1. Torque Requirements Part Recommended Torque

Service valve cap Sheet metal screws Machine screws #8 Compressor bolts Gauge port seal cap 8 ft.- lb. 16 in.- lb. 16 in.- lb. 90 in.- lb. 8 ft.- lb. 11 NM 2 NM 2 NM 10 NM 11 NM

Setting the Unit

CAUTION

In order to avoid injury, take proper precaution when lifting heavy objects. Outdoor units operate under a wide range of weather conditions; therefore, several factors must be considered when positioning the outdoor unit. Position the unit to allow adequate airflow and servicing clearance. Maintain a minimum clearance of 24 inches (610 mm) between multiple units as illustrated in figure 1 for installation clearances. 1. Place a sound-absorbing material, such as Isomode, under the unit if it will be installed in a location or position that will transmit sound or vibration to the living area or adjacent buildings. 2. Install the unit high enough above ground or roof to allow adequate drainage of defrost water and prevent ice build-up. 3. In heavy snow areas, do not locate unit the where snowdrifts will likely build. The unit base should be elevated above the depth of average snows. NOTE - Elevation of the unit may be accomplished by constructing a frame using suitable materials. If a support frame is constructed, it must not block drain holes in unit base.

SLAB MOUNTING When installing unit at grade level, the top of the slab should be high enough above grade so that water from higher ground will not collect around the unit. The slab should have a slope tolerance away from the building of 2 degrees or 2 inches per 5 feet (50 mm per 1500 mm) to prevent ice build-up under the unit during a defrost cycle. NOTE - If necessary for stability, anchor unit to slab as described in Stabilizing Unit on Uneven Surfaces on page 4.

INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM BUILDING STRUCTURE.

GROUND LEVEL

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XP14 SERIES

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See NOTES See NOTES See NOTES See NOTES Control Box NOTES:

Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box. Clearance to one of the other three sides must be 36 in. (914 mm) Clearance to one of the remaining two sides may be 12 in. (305 mm) and the final side may be 6 in. (152 mm). A clearance of 24 in. (610 mm) must be maintained between two units. 48 in. (1219 mm) clearance required on top of unit.

Figure 1. Installation Clearances

BUILDING STRUCTURE MOUNTING SLAB

Figure 2. Slab Mounting Options

ELEVATING THE UNIT (SMALL-BASE UNITS) If additional elevation is necessary, raise the unit by extending the length of the unit support feet. This may be done by cutting four equal true-cut lengths of Schedule (SCH) 40, 4" (101.6mm) piping to the height required as illustrated in figure 3. NOTE - Keep the height of extenders short enough to ensure a sturdy installation. If it is necessary to extend further, consider a different type of field-fabricated framework that is sturdy enough for greater heights. The inside diameter of the 4" (101.6mm) piping is approximately 0.25" (6.35mm) greater than the pre-installed feet on the unit. Devise a shim that will take up the space and hold the extenders onto the feet during this procedure. Small strips of 0.125" (3.175mm) thick adhesive foam may be used. One or two small 1" (25.4mm) square strips should be adequate to hold the extender in place.

Base

NOTE - Keep the height of extenders short enough to ensure a sturdy installation. If it is necessary to extend further, consider a different type of field-fabricated framework that is sturdy enough for greater heights.

Base

Leg Detail

2" (50.8mm) SCH 40 Female Threaded Adapter

Figure 4. Elevated Slab Mounting using Feet Extenders (Larger Base Units) STABILIZING UNIT ON UNEVEN SURFACES To help stabilize an outdoor unit, some installations may require strapping the unit to the pad using brackets and anchors commonly available in the marketplace.

TYPICAL INSTALLATION WITH 3 TO 4 IN. EXTENDERS INSTALLED

Leg Detail

4" (101.6mm) SCH 40 Piping

IMPORTANT! ALWAYS USE STABILIZER BRACKET ON ELEVATED INSTALLATIONS STABILIZER BRACKETS GROUND LEVEL

BUILDING STRUCTURE MOUNTING SLAB

Figure 3. Elevated Slab Mounting using Feet Extenders (Small Base Units) ELEVATING THE UNIT (LARGER-BASE UNITS) Unlike the small-base units which use round feet, the larger-base units are outfitted with elongated feet as illustrated in figure 4. which uses a similar method for elevating the unit height. If additional elevation is necessary, raise the unit by extending the length of the unit support feet. This may be done with 2" SCH 40 female threaded adapter. The specified coupling will fit snuggly into the recess portion of the feet. Use additional 2" SCH 40 male threaded adaptors which can be threaded into the female threaded adaptors to make additional adjustments to the level of the unit.

Figure 5. Elevated Slab Mounting using Feet Extenders

IMPORTANT

Unit Stabilizer Bracket Use (field-provided): Always use stabilizers when unit is raised above the factory height. (Elevated units could become unstable in gusty wind conditions). Stabilizers may be used on factory height units when mounted on unstable or uneven surface.

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With unit positioned at installation site, remove two side louvered panels to expose the unit base pan. Install the brackets as illustrated in figure 6 using conventional practices; replace the panels after installation is complete.

#10 1/2" LONG SELF-DRILLING SHEET METAL SCREWS STABILIZING BRACKET (18 GAUGE METAL - 2" WIDTH; HEIGHT AS REQ'D) #10 1-1/4" LONG HEX HD SCREW & FLATWASHER

Removing Panels

Remove the louvered panels as follows: 1. Remove two screws, allowing the panel to swing open slightly as illustrated in figure 8. 2. Hold the panel firmly throughout this procedure. Rotate bottom corner of panel away from hinge corner post until lower three tabs clear the slots as illustrated figure 8, Detail B . 3. Move panel down until lip of upper tab clears the top slot in corner post as illustrated in figure 8, Detail A. Position and Install Panel Position the panel almost parallel with the unit as illustrated in figure 9, Detail D on page 6 with the screw side as close to the unit as possible. Then, in a continuous motion: S slightly rotate and guide the lip of top tab inward as illustrated in figure 8, Details A and C; then upward into the top slot of the hinge corner post. S rotate panel to vertical to fully engage all tabs. S holding the panel's hinged side firmly in place, close the right-hand side of the panel, aligning the screw holes. When panel is correctly positioned and aligned, insert the screws and tighten.

IMPORTANT! Do not allow panels to hang on unit by top tab. Tab is for alignment and not designed to support weight of panel. Panel shown slightly rotated to allow top tab to exit (or enter) top slot for removing (or installing) panel.

SCREW HOLES

COIL

BASE PAN

CORNER POST

PLASTIC ANCHOR - USE IF CONCRETE (HOLE DRILL 1/4"); NOT IF PLASTIC SLAB (HOLE DRILL 1/8").

Deck Top Mounting

MINIMUM 1 STABILIZING PER SIDE BRACKET (18 GAUGE METAL - 2" WIDTH; HEIGHT AS REQ'D); BEND FOR EXTRA TO FORM RIGHT STABILITY ANGLE

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, 2 BRACKETS PER SIDE, 2" FROM EACH CORNER.

Figure 6. Installing Stabilizer Brackets (Slab Side Mounting) ROOF MOUNTING Install unit 6" (152 mm) above the roof surface to avoid ice build-up around the unit. Locate the unit above a load bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications. If unit cannot be located away from prevailing winter winds, construct a wind barrier sized at least the same height and width as outdoor unit. Position barrier 24" (610 mm) from the sides of the unit in direction of prevailing winds as illustrated in figure 7.

prevailing winter winds wind barrier inlet air

24" (610 mm)

LIP

Detail A

Detail B

inlet air inlet air

ROTATE IN THIS DIRECTION; THEN DOWN TO REMOVE PANEL

Detail C

inlet air

Figure 7. Rooftop Application with Wind Barrier

Figure 8. Removing/Installing Louvered Panels (Details A, B and C)

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XP14 SERIES

MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT AS POSSIBLE) WHILE INSTALLING PANEL. HOLD DOOR FIRMLY TO THE HINGED ANGLE MAY BE TOO SIDE TO MAINTAIN EXTREME FULLY-ENGAGED TABS PREFERRED ANGLE FOR INSTALLATION

4. Units are approved for use only with copper conductors. (A complete unit wiring diagram is located inside the unit control box cover.)

Detail D

Figure 9. Removing/Installing Louvered Panels (Detail D)

WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJURY or DEATH. Unit must be grounded in accordance with national and local codes. NOTE - For use with copper conductors only. Refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size.

CAUTION

To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following: While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched). While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown around and battered.

Figure 10. Outdoor Unit Typical Field Wiring NOTE - For proper voltages, select thermostat wire gauge per the following chart: Table 2. Wire Run Lengths

Wire run length less than 100' (30m) more than 100' (30m) AWG # 18 16 Insulation type color-coded, temperature rating 35ºC minimum

Electrical

In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to the furnace or blower coil installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size. 1. Install line voltage power supply to unit from a properly sized unit disconnect switch. 2. Ground the unit at the unit disconnect switch or to earth ground. 3. To facilitate conduit, a hole is provided in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.

5. Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5 m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight, drafts or vibrations. 6. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit. See figures 11 and 12 on page 7. NOTE - 24V, Class II circuit connections are made in the low voltage junction box.)

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. Line voltage is present at all components when unit is not in operation on units with single-pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.

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Thermostat

R C W1 24V power common 1st-stage auxiliary heat

Indoor Unit

R C W1 W2 W3

Outdoor Unit

24V power common 1st-stage auxiliary heat R C W1

Thermostat

24V power R C common

Indoor Unit

R C

Outdoor Unit

24V power R common C EMERGENCY HEAT RELAY OUTDOOR THERMOSTAT 1st-stage auxiliary heat

E

emergency heat

W1

1st-stage auxiliary heat

W1 W2

W1

G O Y1

indoor blower reversing valve compressor

G O Y1 G O Y1 indoor blower reversing valve compressor

W3 G O Y1

(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)

(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)

Figure 11. Outdoor Unit and Blower Unit Thermostat Designations

Figure 12. Outdoor Unit and Blower Unit Thermostat Designations (with Emergency Heat Relay)

Figure 13. Typical XP14 Wiring

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XP14 SERIES

Refrigerant Piping

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC's, HFC's, and HCFC's) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance. If the XP14 unit is being installed with a new indoor coil and line set, the plumbing connections should be made as outlined in this section. If an existing line set and/or indoor coil is going to be used to complete the XP14 system, refer to the following section that includes flushing procedures. Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections). Use Lennox L15 (sweat, non-flare) series line sets as shown in table 3 or use field-fabricated refrigerant lines. Refer to Refrigerant Piping Guide (Corp. 9351-L9) for proper size, type, and application of field-fabricated lines. Valve sizes are also listed in table 3. REFRIGERANT LINE CONNECTIONS - XP14 OUTDOOR UNIT MATCHED WITH NEW INDOOR COIL AND LINE SET If replacing an existing coil equipped with a liquid line functioning as a metering orifice, replace the liquid line prior to installing the XP14 unit. Line sets are described in table 3. Table 3. Refrigerant Line Sets Model

-018 -024 -030 -036 -042 -048 -060

Select line set diameters from table 3 to ensure that oil returns to the compressor. S Units are designed for line sets of up to 50 feet (15 m); for longer line sets, consult piping guidelines. S Size vertical vapor riser to maintain minimum velocity at minimum capacity. INSTALLING REFRIGERANT LINE Pay close attention to line set isolation during installation of any heat pump or a/c system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent noises. Also, consider the following when placing and installing a high-efficiency outdoor unit: 1. Placement Some localities are adopting sound ordinances based on the unit's noise level observed from the adjacent property, not from the installation property. Install the unit as far as possible from the property line. When possible, do not install the unit directly outside a window. Glass has a very high level of sound transmission. Figure 14 shows how to place the outdoor unit and line set.

S

Install unit away from windows

Valve Field Connections

Liquid Line

3/8 in. (10 mm) 3/8 in. (10 mm) 3/8 in. (10 mm)

Recommended Line Set

Liquid Vapor Line Line

3/8 in. (10 mm) 3/8 in. (10 mm) 3/8 in. (10 mm) 3/4 in (19 mm) 7/8 in (22 mm) 1-1/8 in. (29 mm)

Vapor Line

3/4 in (19 mm) 7/8 in (22 mm) 1-1/8 in. (29 mm)

L15 Line Sets

L15-41 15 ft. - 50 ft. (4.6 m - 15 m) L15-65 15 ft. - 50 ft. (4.6 m - 15 m) Field Fabricated Two 90° elbows installed in line set will reduce line set vibration.

NOTE - When installing refrigerant lines, refer to Lennox Refrigerant Piping Guide (Corp. 9351-L9) or Lennox Technical Support Department Product Applications Group for assistance. In addition, be sure to consider the following points:

Figure 14. Outside Unit Placement 2. Line Set Isolation The following illustrations demonstrate procedures which ensure proper refrigerant line set isolation. S Figure 15 on page 9 shows how to install line sets on horizontal runs. S Figure 16 on page 9 shows how to install line sets on vertical runs. S Figure 17 on page 9 shows how to make a transition from horizontal to vertical

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505244M 10/09

TO HANG LINE SET FROM JOIST OR RAFTER, USE EITHER METAL STRAPPING MATERIAL OR ANCHORED HEAVY NYLON WIRE TIES. 8 FEET STRAPPING MATERIAL (AROUND SUCTION LINE ONLY)

WIRE TIE (AROUND SUCTION LINE ONLY)

ANCHORED HEAVY NYLON WIRE TIE

FLOOR JOIST OR ROOF RAFTER 8 FEET

TAPE OR WIRE TIE

WALL STUD

STRAP LIQUID LINE TO SUCTION LINE METAL SLEEVE TAPE OR WIRE TIE STRAP THE SUCTION LINE TO THE JOIST OR RAFTER AT 8 FEET INTERVALS THEN STRAP THE LIQUID LINE TO THE SUCTION LINE.

LIQUID LINE METAL SLEEVE SUCTION LINE - WRAPPED IN ARMAFLEX AUTOMOTIVE MUFFLER-TYPE HANGER

FLOOR JOIST OR ROOF RAFTER

Figure 15. Refrigerant Line Sets: Installing Horizontal Runs

IMPORTANT - REFRIGERANT LINES MUST NOT CONTACT WALL. OUTSIDE WALL WOOD BLOCK BETWEEN STUDS SUCTION LINE LIQUID LINE

WALL STUD STRAP LIQUID LINE TO SUCTION LINE

LIQUID LINE SUCTION LINE - WRAPPED IN ARMAFLEX WIRE TIE INSIDE WALL STRAP NOTE - SIMILAR INSTALLATION PRACTICES SHOULD BE USED IF LINE SET IS TO BE INSTALLED ON EXTERIOR OF OUTSIDE WALL. SLEEVE WIRE TIE METAL SLEEVE

Figure 17. Refrigerant Line Sets: Transition from Vertical to Horizontal BRAZING CONNECTION PROCEDURE

WOOD BLOCK WIRE TIE STRAP

WARNING

Polyol ester (POE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections. 1. Cut ends of the refrigerant lines square (free from nicks or dents). Debur the ends. The pipe must remain round; do not pinch end of the line. 2. Flow dry nitrogen through the refrigerant piping while making line set connections; this prevents carbon deposits (oxidation) buildup on the inside of the joints being brazed. Such buildup may restrict refrigerant flow through screens and metering devices. To do this:

D

SLEEVE

SUCTION LINE WRAPPED WITH ARMAFLEX LIQUID LINE OUTSIDE WALL

IMPORTANT! REFRIGERANT LINES MUST NOT CONTACT STRUCTURE.

CAULK PVC PIPE FIBERGLASS INSULATION

Figure 16. Refrigerant Line Sets: Installing Vertical Runs (New Construction Shown)

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the Schrader port connection on the vapor service valve and out of the Schrader port connection on the liquid service valve. (Metering device (CTXV and RFC) will allow low pressure nitrogen to flow through the system.)

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XP14 SERIES

D

While nitrogen is flowing, braze refrigerant line set to the indoor and outdoor units. IMPORTANT: The flow of nitrogen must have an escape path other than through the joint to be brazed.

IMPORTANT

The line set and indoor coil must be flushed with at least the same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding. EQUIPMENT REQUIRED FOR FLUSHING LINE SET The following equipment is required to flush the existing line set and indoor coil: S two clean HCFC-22 recovery cylinders S oilless recovery machine with a pump down feature S gauge set for HCFC-22 refrigerant S gauge set for HFC-410A refrigerant (see Manifold Gauge Set section on page 12). FLUSHING PROCEDURE 1. Remove existing HCFC-22 refrigerant using the following, applicable procedure as illustrated in figure 18: If the existing outdoor unit is not equipped with shut-off valves, or if the unit is not operational AND you plan to use the existing HCFC-22 refrigerant to flush the system - D Disconnect all power to the existing outdoor unit. D Connect to the existing unit, a clean recovery cylinder and the recovery machine according to the instructions provided with the recovery machine. D Remove all HCFC-22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant. D Disconnect the liquid and vapor lines from the existing outdoor unit. If the existing outdoor unit is equipped with manual shut-off valves AND you plan to use NEW HCFC-22 refrigerant to flush the system - D Start the existing HCFC-22 system in the cooling mode and close the liquid line valve. D Pump all of the existing HCFC-22 refrigerant back into the outdoor unit. (It may be necessary to bypass the low pressure switches to ensure complete refrigerant evacuation.) D When the low side system pressures reach 0 psig, close the vapor line valve. D Disconnect all power to the existing outdoor unit. Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system. D Disconnect the liquid and vapor lines from the existing outdoor unit. 2. Remove the existing outdoor unit. Set the new HFC-410A unit and follow the Brazing Connection Procedure provided on page 9 to make line set connections. DO NOT install HFC-410A check/expansion valve at this time. 3. Make low voltage and line voltage connections to the new outdoor unit. DO NOT turn on power to the unit or open the outdoor unit service valves at this time.

3. Use silver alloy brazing rods (5 or 6 percent minimum silver alloy for copper-to-copper brazing or 45 percent silver alloy for copper-to-brass or copper-to-steel brazing) which are rated for use with HFC-410A refrigerant. 4. Wrap a wet cloth around the valve body and the copper tube stub to protect it from heat damage during brazing. Wrap another wet cloth underneath the valve body to protect the base paint. NOTE - The tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing and rigidity. 5. Install a field-provided check expansion valve (approved for use with HFC-410A refrigerant) in the liquid line at the indoor coil.

Flushing Existing Line Set and Indoor Coil

IMPORTANT

If this unit is being matched with an approved line set or indoor coil which was previously charged with HCFC-22 refrigerant, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the check expansion valve, reducing system performance and capacity. Failure to properly flush the system per the instructions below will void the warranty.

WARNING

Danger of fire. Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressurized. Application of a brazing torch while pressurized may result in ignition of the refrigerant and oil mixture - check the high and low pressures before unbrazing.

CAUTION

This procedure should not be performed on systems which contain contaminants (Example: compressor burn out).

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INVERTED HCFC-22 CYLINDER CONTAINS CLEAN HCFC-22 TO BE USED FOR FLUSHING.

GAUGE MANIFOLD

A

SUCTION LINE SERVICE VALVE NEW OUTDOOR UNIT

LOW

HIGH

OPENED EXISTING INDOOR UNIT LIQUID LINE SERVICE VALVE RECOVERY CYLINDER TANK RETURN

CLOSED

B

D

A B C D

C

were removed during the first flush. After each system flush, allow the recovery machine to pull a vacuum on the system at the end of the procedure. 9. Close the valve on the inverted HCFC-22 drum and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off. 10. Use dry nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery machine, gauges and HCFC-22 refrigerant drum. Reinstall pressure tap valve cores into XP14 unit's service valves. 11. Install check expansion valve (approved for use with HFC-410A refrigerant) in the liquid line at the indoor coil.

Inverted HCFC-22 cylinder with clean refrigerant to the suction service valve. HCFC-22 gauge set (low side) to the liquid line valve. HCFC-22 gauge set center port to inlet on the recovery machine. with an empty recovery tank to the gauge set. Connect recovery tank to recovery machines per machine instructions.

NOTE - The inverted HCFC-22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system.

4. Remove the existing HCFC-22 refrigerant flow control orifice or check expansion valve before continuing with flushing procedures. HCFC-22 flow control devices (fixed orifice/check expansion valve) are not approved for use with HFC-410A refrigerant and may prevent proper flushing. Use a field-provided fitting to reconnect the lines. 5. Remove the pressure tap valve cores from the XP14 unit's service valves. Connect an HCFC-22 cylinder with clean refrigerant to the vapor service valve. Connect the HCFC-22 gauge set to the liquid line valve and connect a recovery machine with an empty recovery tank to the gauge set. 6. Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor coil. 7. Invert the cylinder of clean HCFC-22 and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor coil before it enters the recovery machine. 8. After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC-22 vapor is recovered. Allow the recovery machine to pull a vacuum on the system. NOTE - A single system flush should remove all of the mineral oil from the existing refrigerant lines and indoor coil. A second flushing may be done (using clean refrigerant) if insufficient amounts of mineral oil

SUCTION LIQUID

INLET DISCHARGE RECOVERY MACHINE

Refrigerant Metering Device

XP14 units may be used in check thermal expansion valve (CTXV) systems only. See indoor coil installation instructions and the Lennox engineering handbook for approved HFC-410A valve match-ups and application information. NOTE - HFC-410A systems will not operate properly with an HCFC-22 valve. Check thermal expansion valves equipped with fittings are available from Lennox. Refer to the Engineering Handbook for applicable expansion valves for use with specific match-ups. (Uncased Coil Shown)

TWO PIECE PATCH PLATE (uncased coil only) DISTRIBUTOR TUBES ORIFICE HOUSING EXPANSION VALVE (see note)

Figure 18. Flushing Connections

O-RING

O-RING

SENSING LINE STRAINER

EQUALIZER LINE Remove and discard SEAL ASSEMBLY (if applicable) SUCTION LINE ACCESS FITTING (no valve core) SENSING BULB (insulation required) On smaller lines, bulb may be mounted on top 12 1/2" & smaller suction line LIQUID LINE

9

Suction Line Bulb

3

Do not mount bulb on bottom of line

5/8" & larger suction line

NOTE - If necessary, remove HCFC-22 flow control device (fixed orifice/check expansion valve) from existing line set before installing HFC-410A approved expansion valve and o-ring.

Figure 19. Metering Device Installation

Page 11

XP14 SERIES

DISTRIBUTOR

OUTDOOR UNIT

NOTE - ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE

CHECK EXPANSION VALVE BIFLOW FILTER / DRIER LOW HUGH PRESSURE PRESSURE MUFFLER VAPOR SERVICE PORT

OUTDOOR COIL

INDOOR UNIT

GAUGE MANIFOLD

VAPOR SERVICE PORT

TO HFC-410 A DRUM

LIQUID LINE SERVICE PORT

VAPOR LINE VALVE

COMPRESSOR

CHECK EXPANSION VALVE

NOTE - Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines and indoor coil. Use vapor gauge port to measure vapor pressure during charging.

INDOOR COIL

Figure 20. XP14 Cooling Cycle (Showing Gauge Manifold Connections)

IMPORTANT

Failure to remove a fixed orifice when installing an expansion valve on the indoor coil will result in improper operation and damage to the system. If you install a check thermal expansion valve with an indoor coil that includes a fixed orifice, remove the orifice before the check expansion valve is installed. See figure 19 for installation of the check expansion valve.

Manifold Gauge Set

Manifold gauge sets used with systems charged with HFC-410A refrigerant must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0 - 800 on the high side and a low side of 30" vacuum to 250 psi with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating.

2. Use a service wrench with a hex-head extension (3/16" for liquid-line valve sizes; 5/16" for vapor-line valve sizes) to back the stem out counterclockwise as far as it will go. 3. Replace the stem cap. Tighten finger tight, then torque per table 1 on page 3. To Close Front-Seated Service Valves: 1. Remove the stem cap with an adjustable wrench. 2. Use a service wrench with a hex-head extension (3/16" for liquid-line valve sizes; 5/16" for vapor-line valve sizes) to turn the stem clockwise to seat the valve. Tighten it firmly. 3. Replace the stem cap. Tighten finger tight, then torque per table 1 on page 3.

SCHRADER VALVE [OPEN TO LINE SET WHEN VALVE IS CLOSED (FRONT SEATED)] TO OUTDOOR COIL TO INDOOR COIL (VALVE FRONT-SEATED) STEM CAP INSERT HEX WRENCH HERE

Service Valves

The service valves and gauge ports are used for leak testing, evacuating, charging and checking charge. Each valve is equipped with a service port which has a factory-installed Schrader valve. A service port cap protects the Schrader valve from contamination and serves as the primary leak seal. To Access Schrader Port: 1. Remove service port cap with an adjustable wrench. 2. Connect gauge to the service port. 3. When testing is completed, replace service port cap. Tighten finger tight, then torque per table 1 on page 3. To Open Front-Seated Service Valves: 1. Remove stem cap with an adjustable wrench.

SERVICE PORT CAP

Valve in closed position

Valve in open position

Figure 21. Front-Seated Liquid Line Valve

Vapor Line Ball Valve

Ball-type service valves as illustrated in figure 22 function the same way as the other valves but cannot be rebuilt; if one fails, replace with a new valve. The ball valve is equipped with a service port with a factory-installed Schrader valve. A service port cap protects the Schrader valve from contamination and assures a leak-free seal.

Page 12

505244M 10/09

STEM CAP USE ADJUSTABLE WRENCH TO OPEN: ROTATE STEM COUNTER-CLOCKWISE 90°. TO CLOSE: ROTATE STEM CLOCKWISE 90°. TO OUTDOOR COIL

STEM

BALL (SHOWN CLOSED)

SERVICE PORT TO INDOO R COIL SCHRADER VALVE SERVICE PORT CAP

Figure 22. Ball-Type Vapor Valve (Valve Closed)

Leak Testing

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks.

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

2. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant. Open the valve on the HFC-410A cylinder (vapor only). 3. Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. [A trace amount is a maximum of 2 ounces (57 g) refrigerant or 3 pounds (31 kPa) pressure]. Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect HFC-410A cylinder. 4. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set. 5. Connect the manifold gauge set high pressure hose to the vapor valve service port. (Normally, the high pressure hose is connected to the liquid line port; however, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.) 6. Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit. 7. After a few minutes, open a refrigerant port to ensure the refrigerant you added is adequate to be detected. (Amounts of refrigerant will vary with line lengths.) Check all joints for leaks. Purge dry nitrogen and HFC-410A mixture. Correct any leaks and recheck.

WARNING

Fire, Explosion and Personal Safety Hazard. Failure to follow this warning could result in damage, personal injury or death. Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause damage by fire and/ or an explosion, that could result in personal injury or death.

Evacuation

Evacuating the system of noncondensables is critical for proper operation of the unit. Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts.

IMPORTANT

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument that reads from 50 microns to at least 23,000 microns. 1. Connect manifold gauge set to the service valve ports as follows: D low pressure gauge to vapor line service valve D high pressure gauge to liquid line service valve 2. Connect micron gauge. 3. Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set. 4. Open both manifold valves; start the vacuum pump. 5. Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in absolute pressure. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

WARNING

Danger of explosion! When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa). USING AN ELECTRONIC LEAK DETECTOR

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant. 1. Connect a cylinder of HFC-410A to the center port of the manifold gauge set.

Page 13

XP14 SERIES

NOTE - The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure. 6. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), close the manifold gauge valves, turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose. Open the manifold gauge valves to break the vacuum in the line set and indoor unit. Close the manifold gauge valves.

4. Replace stem caps and secure finger tight, then tighten an additional (1/6) one-sixth of a turn. 5. Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit nameplate. If not, do not start the equipment until the power company has been consulted and the voltage condition has been corrected. 6. Set the thermostat for a cooling demand. Turn on power to indoor blower unit and close the outdoor unit disconnect to start the unit. 7. Recheck voltage while the unit is running. Power must be within range shown on the nameplate.

IMPORTANT

Mineral oils are not compatible with HFC-410A. If oil must be added, it must be a polyol ester oil.

WARNING

Danger of Equipment Damage! Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void warranty. 7. Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the dry nitrogen from the line set and indoor unit. 8. Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump and closing the manifold gauge valves. 9. When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of HFC-410A refrigerant. Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit. Close manifold gauge valves and shut off the HFC-410A cylinder and remove the manifold gauge set.

Refrigerant Charge

This system is charged with HFC-410A refrigerant which operates at much higher pressures than HCFC-22. The recommended check expansion valve is approved for use with HFC-410A. Do not replace it with a valve that is designed to be used with HCFC-22. This unit is NOT approved for use with coils that include metering orifices or capillary tubes. Units are factory-charged with the amount of HFC-410A refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15 ft. (4.6 m) line set. For varying lengths of line set, refer to table 3 for refrigerant charge adjustment. A blank space is provided on the unit rating plate to list the actual field charge.

Check Indoor Airflow before Charging

IMPORTANT

Check airflow before charging! NOTE - Be sure that filters and indoor and outdoor coils are clean before testing. COOLING MODE INDOOR AIRFLOW CHECK Check airflow using the Delta-T (DT) process (figure 23). HEATING MODE INDOOR AIRFLOW CHECK Blower airflow (CFM) may be calculated by energizing electric heat and measuring:

Start-Up

IMPORTANT

If unit is equipped with crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Rotate fan to check for frozen bearings or binding. 2. Inspect all factory- and field-installed wiring for loose connections. NOTE - After the system has been evacuated and before completing all the remaining start-up steps, this is the ideal time to adjust the amount of refrigerant made necessary by line set length difference and by the specific indoor unit match-up. Skip to the paragraph Setup for Checking and Adding Charge" on page 15 to setup for charging and for determining if charge is needed; adjust the charge accordingly. 3. Open the liquid line and vapor line service valves (counterclockwise) to release refrigerant charge (contained in outdoor unit) into the system.

505244M 10/09

S S S

temperature rise between the return air and supply air temperatures at the indoor coil blower unit, voltage supplied to the unit, amperage being drawn by the heat unit(s).

Then, apply the measurements taken in following formula to determine CFM:

Amps x Volts x 3.41 CFM = 1.08 x Temperature rise (F)

Check indoor airflow using the step procedures as illustrated in figure 23.

Page 14

Dry-bulb

Temp. of air entering indoor coil ºF

DT

80 78 76 74 72 24 23 22 21 24 23 22 21 24 23 22 21 23 22 21 20 23 22 21 19 22 21 20 19 22 21 19 18 22 20 19 17 20 19 18 16 19 18 17 16 18 17 16 15 17 16 15 14 16 15 14 13 15 14 13 12

Step 1. Determine the desired DT Measure entering air temperature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle). Step 2. Find temperature drop across coil Measure the coil's dry bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (TDrop) = A minus C. Step 3. Determine if fan needs adjustment If the difference between the measured TDrop and the desired DT (TDrop­DT) is within +3º, no adjustment is needed. See examples: Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions: Cº TDrop ­ DT = ºF ACTION 53º 58º 62º 19 14 10 ­ ­ ­ 15 15 15 = = = 4 -1 -5 Increase the airflow (within +3º range) no change Decrease the airflow

A

20 20 19 18 17 17 16 15 15 14 13 12 11 10 19 19 18 18 17 17 16 15 15 14 13 12 11 10 57 58 59 60 61 62 63 64 65 66 67 68 69 70

70 Wet-bulb ºF

B C 53º TDrop 19º air flow

DRY BULB

A 72º air flow B 64º

WET BULB

DRY BULB

Step 4. Adjust the fan speed See indoor unit instructions to increase/decrease fan speed. Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within +3º.

All temperatures are expressed in ºF

INDOOR COIL

Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart

Setup for Checking and Adding Charge

SETUP FOR CHARGING Connect the manifold gauge set to the unit's service ports (see figure 20):

weighing facilities are not available, use the subcooling method.) Table 4. Charge per Line Set Lengths

Liquid Line Set Diameter 3/8 in. (9.5mm) Oz. per 5 ft. (g per 1.5m) adjust from 15 ft. (4.6m) line set* 3 ounce per 5 ft. (85g per 1.5m)

S S

low pressure gauge to vapor service port high pressure gauge to liquid service port

Close manifold gauge set valves. Connect the center manifold hose to an upright cylinder of HFC-410A. CALCULATING CHARGE If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refrigerant charge:

Amount specified on nameplate Adjust amt. for variation in line set length (table 4) Additional charge specified per indoor unit match-up (table 5)

NOTE - *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount.

Subcooling Charge

Requirements these items are required for charging:

S S

Manifold gauge set connected to unit. Thermometers for measuring outdoor ambient, liquid line, and vapor line temperatures.

Total charge

+

+

=

When to use cooling mode When outdoor temperature is 60°F (15°C) and above, use cooling mode to adjust charge. When to use heating mode When the outdoor temperature is below 60°F (15°C), use the heating mode to adjust the charge. Adding Charge for Indoor Match-Up Table 5 lists all the Lennox recommended indoor unit matches along with the charge levels for the various sizes of outdoor units.

Weigh in Charge

1. Recover the refrigerant from the unit. 2. Conduct leak check; evacuate as previously outlined. 3. Weigh in the unit nameplate charge plus any charge required for line set differences from 15 feet and any extra indoor unit match-up amount per table 5. (If

Page 15

XP14 SERIES

Table 5. Adding Charge per Indoor Unit Match using Subcooling Method

Use cooling mode 60ºF (15ºC) Use heating mode 1 Check the airflow as illustrated in figure 23 on page 15 to be sure the indoor airflow is as required. (Make any air flow adjustments before continuing with the following procedure.) 2 Measure outdoor ambient temperature; determine whether to use cooling mode or heating mode to check charge. 3 Connect gauge set. 4 Check Liquid and Vapor line pressures. Compare pressures with Normal Operating Pressures table 7, (Table 7 is a general guide. Expect minor pressure variations. Significant differences may mean improper charge or other system problem.) 5 Set thermostat for heat/cool demand, depending on mode being used: Using cooling mode When the outdoor ambient temperature is 60°F (15°C) and above. Target subcooling values in table below are based on 70 to 80°F (21-27°C) indoor return air temperature; if necessary, operate heating to reach that temperature range; then set thermostat to cooling mode setpoint to 68ºF (20ºC). When pressures have stabilized, continue with step 6. Using heating mode When the outdoor ambient temperature is below 60°F (15°C). Target subcooling values in table below are based on 65-75°F (18-24°C) indoor return air temperature; if necessary, operate cooling to reach that temperature range; then set thermostat to heating mode setpoint to 77ºF (25ºC). When pressures have stabilized, continue with step 6. 6 Read the liquid line temperature; record in the LIQº space. 7 Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure chart listed on page 18 and record it in the SATº space. 8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.

SATº LIQº ­ SCº =

9 Compare SCº results with table below, being sure to note any additional charge for line set and/or match-up. 10 If subcooling value is greater than shown in table, remove refrigerant; if less than shown, add refrigerant. 11 If refrigerant is added or removed, repeat steps 5 through 10 to verify charge.

Page 16

505244M 10/09

Table 6. Air Handler/Coil Matchups and Target Subcooling

INDOOR MATCHUPS

Target Subcooling Heating Cooling

*Add charge lb oz 8 0 0 oz 0 2 14 3 14 2 14 2 2 7 10 0 4 2 14 3 8 2 2 oz 8 12 6 3 4 6 4 6 0 6 0 3 0

INDOOR MATCHUPS

Target Subcooling Heating Cooling

*Add charge lb oz 12 8 6 3 3 14 oz 0 0 9 3 2 3 3 5 3 5 5 7 8 15 9 4 8 0 0 oz 13 0 8 7 8 8 7 10 7 4

INDOOR MATCHUPS

Target Subcooling Heating Cooling

*Add charge lb oz 4 9 7 4 oz 9 2 2 0 2 0 2 12 9 1 14 0 0 0 7 14 0 oz 0 0 0 0 0 0 0 0 0 0 0

(+5ºF) XP14-018 CBX27UH-018/024 CBX32MV-018/024 CBX40UHV-024 XP14-024 CBX26UH-024 CBX27UH-018/024 CBX32M-018/024 CBX32M-030 CBX32MV-018/024 CBX32MV-024/030 CBX40UHV-024 CBX40UHV-030 CH23-41 CH33-25A CH33-42B CH33-36A CH33-36C CR33-30/36A/B/C CX34-25A/B CX34-31A/B CX34-36A/B/C CX34-38A/B S/N# 6007 and

after

(+1ºF) XP14-030 (Continued) CH33-42B CR33-30/36A/B/C CX34-31A/B CX34-38A/B S/N# 6007 and

after

(+5ºF)

(+1ºF) XP14-042 (Continued) CR33-50/60C,-60D CX34-62C, -62D CX34-49C CX34-60D XP14-048 CBX26UH-048 CBX27UH-048 CBX32M-048, -060 CBX32MV-048 CBX32MV-060 CBX40UHV-048 CBX40UHV-060 CBX32MV-068 CH23-68 CH33-50/60C CH33-62D CH33-60D CR33-50/60C CR33-60D CX34-62C, -62D CX34-49D CX34-60D XP14-060 CBX26UH-048 CBX26UH-060 CBX27UH-060 CBX32M-048, -060 CBX32MV-048, -060 CBX40UHV-048, -060 CBX32MV-068 CH23-68 CH33-50/60C CH33-62D CX34-62C, -62D

(+5ºF)

(+1ºF)

13 15 15

7 7 7

0 0 0 lb

6 30 11 6 11 15

6 8 6 6 6 11

1 0 1 2 2 2 lb

26 12 12 12

6 6 6 6

0 0 0 0 lb

25 15 16 15 16 15 16 15 16 16 14 16 16 25 16 15 16 11 14

7 8 8 8 8 8 8 8 8 6 11 8 8 7 8 8 8 11 11

0 1 0 1 0 1 0 1 0 0 1 1 0 0 0 1 1 2 2 lb

CX34-38A/B Before S/N#

6007

CX34-43B/C XP14-036 C33-44C CBX26UH-036 CBX26UH-037 CBX27UH-036 CBX32M-036 CBX32M-042 CBX32MV-036 CBX32MV-048 CBX40UHV-036 CBX40UHV-042, -048 CH33-50/60C CH33-44B CH33-48B CR33-50/60C CR33-48B/C CX34-49C CX34-43B/C, -50/60C CX34-38A/B S/N# 6007 and

after

8 11 11 25 11 25 11 10 20 11 10 11 35 37 10 11 11

7 8 8 8 8 8 8 7 9 8 7 8 5 6 7 8 8

1 1 1 0 1 0 1 1 2 1 1 0 0 0 1 0 0 lb

13 26 25 13 13 13 13 11 13 11 11 13 13 25 25 13 13 6 13

6 5 4 6 6 6 6 8 6 8 8 6 6 4 5 6 6 6 6

0 0 1 0 0 0 0 2 0 2 2 1 1 1 0 2 1 0 0 lb

CX34-38A/B before S/N#

6007

XP14-030 CH23-41 CH23-51 CBX26UH-024 CBX26UH-030 CBX27UH-030 CBX32M-030 CBX32M-036 CBX32MV-024/030 CBX32MV-036 CBX40UHV-024, -030 CBX40UHV-036 C33-44C CH33-36C 11 6 30 29 11 11 11 11 15 11 15 11 11 6 6 8 8 6 6 6 6 7 6 7 6 3

12 14 12 12 12 12 12 12 12 12 12

7 4 5 5 5 5 7 5 5 5 7

1 0 0 0 0 0 1 0 0 0 1

0 1 0 2 2 1 2 1 3 1 3 2 0

CX34-38A/B before S/N#

6007

XP14-042 CH23-68 CBX26UH-042 CBX27UH-042 CBX32M-048 CBX32MV-048 CBX40UHV-042, -048 CH33-43 CH33-62D CH33-50/60C CH33-60D 20 27 12 12 12 12 12 12 12 12 9 6 6 6 6 6 6 6 6 6

0 0 0 0 0 0 0 0 0 0

*Add charge = Extra matchup amount required in addition to charge indicated on Heat Pump nameplate (remember to also add any charge required for line set differences from 15 feet). SN indicates serial number.

Page 17

XP14 SERIES

Table 7. Normal Operating Pressures - Liquid +10 and Vapor +5 PSIG* (Cooling)

XP14-018 5F (5C)** 60 (15) 50 (10) 40 (4) 30 (-1) 20 (-7) 65 (18) 70 (21) 75 (24) 80 (27) 85 (29) 90 (32) 95 (35) 100 (38) 105 (41) 110 (38) 115 (45) Liquid / Vapor XP14-024 Liquid / Vapor XP14-030 Liquid / Vapor XP14-036 Liquid/ Vapor XP14-042 Liquid / Vapor XP14-048 Liquid / Vapor XP14-060 Liquid / Vapor

Heating

346 / 139 323 / 117 306 / 98 278 / 84 273 / 66 226 / 140 244 / 141 263 / 142 283 / 143 302 / 144 328 / 145 351 / 146 376 / 147 402 / 148 430 / 149 465 / 150 352 / 138 331 / 114 304 / 99 299 / 80 283 / 66 233 / 137 252 / 138 271 / 140 292 / 141 314 / 142 338 / 143 361 / 145 387 / 146 412 / 147 441 / 148 471 / 151 338 / 137 334 / 112 312 / 93 302 / 74 280 / 53 238 / 138 263 / 139 279 / 139 299 / 140 324 / 141 340 / 142 375 / 145 397 / 145 424 / 147 454 / 150 485 / 150 350 / 134 331 / 117 313 / 97 298 / 83 284 / 66 373 / 139 363 / 117 348 / 97 336 / 74 322 / 64 223 / 125 241 / 130 261 / 134 282 / 138 302 / 139 326 / 140 349 / 141 374 / 142 399 / 143 428 / 145 455 / 146 355 / 130 336 / 113 315 / 88 296 / 72 286 / 64 231 / 136 248 / 139 271 / 140 291 / 142 312 / 143 335 / 144 359 / 145 384 / 146 411 / 148 439 / 149 468 / 150 351 / 117 333 / 105 316 / 88 308 / 70 300 / 61 243 / 136 263 / 137 282 / 138 306 / 139 327 / 140 351 / 141 376 / 142 401 / 143 426 / 145 452 / 146 484 / 148

Cooling

220 / 138 236 / 140 256 / 141 276 / 142 298 / 143 321 / 144 344 / 144 369 / 146 394 / 147 421 / 148 449 / 149

*IMPORTANT These are most popular match-up pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary. **Temperature of the air entering the outside coil.

Table 8. HFC-410A Temp. (°F) - Pressure (Psig) °F

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

Psig

100.8 102.9 105.0 107.1 109.2 111.4 113.6 115.8 118.0 120.3 122.6 125.0 127.3 129.7 132.2 134.6 137.1 139.6 142.2 144.8 147.4 150.1 152.8 155.5 158.2 161.0 163.9 166.7 169.6 172.6 175.4

°F

63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Psig

178.5 181.6 184.3 187.7 190.9 194.1 197.3 200.6 203.9 207.2 210.6 214.0 217.4 220.9 224.4 228.0 231.6 235.3 239.0 242.7 246.5 250.3 254.1 258.0 262.0 266.0 270.0 274.1 278.2 282.3 286.5

°F

94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124

Psig

290.8 295.1 299.4 303.8 308.2 312.7 317.2 321.8 326.4 331.0 335.7 340.5 345.3 350.1 355.0 360.0 365.0 370.0 375.1 380.2 385.4 390.7 396.0 401.3 406.7 412.2 417.7 423.2 428.8 434.5 440.2

°F

125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155

Psig

445.9 451.8 457.6 463.5 469.5 475.6 481.6 487.8 494.0 500.2 506.5 512.9 519.3 525.8 532.4 539.0 545.6 552.3 559.1 565.9 572.8 579.8 586.8 593.8 601.0 608.1 615.4 622.7 630.1 637.5 645.0

Page 18

505244M 10/09

Defrost System

DEFROST SYSTEM DESCRIPTION The demand defrost controller measures differential temperatures to detect when the system is performing poorly because of ice build-up on the outdoor coil. The controller self-calibrates when the defrost system starts and after each system defrost cycle. The defrost control board components are shown in figure 24. The control monitors ambient temperature, outdoor coil temperature, and total run time to determine when a defrost cycle is required. The coil temperature probe is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation. NOTE - The demand defrost board accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the board initiates defrost cycles. SERVICE LIGHT OPERATION The thermostat is not included with the unit and must be purchased separately. Some outdoor thermostats incorporate isolating contacts and an emergency heat function (which includes an amber indicating light). The service light thermostat will enable the emergency heat light function on the room thermostat. EMERGENCY HEAT (AMBER LIGHT) An emergency heat function is designed into some room thermostats. This feature is applicable when isolation of the outdoor unit is required, or when auxiliary electric heat is staged by outdoor thermostats. When the room thermostat is placed in the emergency heat position, the outdoor unit control circuit is isolated from power and field-provided relays bypass the outdoor thermostats. An amber indicating light simultaneously comes on to remind the homeowner that he is operating in the emergency heat mode. Emergency heat is usually used during an outdoor unit shutdown, but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature is below 50°F (10°C). System should be left in the emergency heat mode at least six hours to allow the crankcase heater sufficient time to prevent compressor slugging. FILTER DRIER The unit is equipped with a large-capacity biflow filter drier which keeps the system clean and dry. If replacement is necessary, order another of the same design and capacity. The replacement filter drier must be suitable for use with HFC-410A refrigerant. DEFROST CONTROL BOARD Figure 24 provides a basic illustration of the layout of the defrost control board. Table 9 provides information concerning pin-out and jumper configurations.

Note - Component Locations Vary by Board Manufacturer.

TEST PINS DEFROST TERMINATION PIN SETTINGS SENSOR PLUG IN (COIL, AMBIENT, & DISCHARGE SENSORS) LOW AMBIENT THERMOSTAT PINS

DIAGNOSTIC LEDS

DELAY PINS REVERSING VALVE

24V TERMINAL STRIP CONNECTIONS

PRESSURE SWITCH CIRCUIT CONNECTIONS

Figure 24. Defrost Control Board Test: Defrost Temperature Termination Shunt (Jumper) Pins The defrost board selections are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The shunt termination pin is factory set at 50°F (10°C). If the temperature shunt is not installed, the default termination temperature is 90°F (32°C). Note: The Y1 input must be active (ON) and the O" room thermostat terminal into board must be inactive. DIAGNOSTIC LEDS The state (Off, On, Flashing) of two LEDs on the defrost board (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 10. DELAY MODE The defrost board has a field-selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode. When a jumper is installed on the DELAY pins, the compressor will be cycled off for 30 seconds going in and out of the defrost mode. Units are shipped with jumper installed on DELAY pins. DEFROST BOARD PRESSURE SWITCH CONNECTIONS The unit's automatic reset pressure switches (LO PS - S87 and HI PS - S4) are factory-wired into the defrost board on the LO-PS and HI-PS terminals, respectively. Low Pressure Switch (LO-PS) When the low pressure switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike. The low pressure switch is ignored under the following conditions: S during the defrost cycle and 90 seconds after the termination of defrost S when the average ambient sensor temperature is below 15° F (-9°C) S for 90 seconds following the start up of the compressor S during test mode

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Table 9. Defrost Control Board Description

ID O Out LO-PS Y2 Y1 HI-PS P1 Description 24 VAC output connection for reversing valve Connection for low-pressure switch 24 VAC output for second stage compressor solenoid 24 VAC common output, switched for enabling compressor contactor Connection for high-pressure switch Seven position square pin header. P1 provides selection of the defrost terminate temperature based on the position of selection shunt, as well as selection pins for enabling the field test mode. The following connections are provided in the seven position P2 screw terminal block: W1 C L R Y2 O Y1 P3 24 VAC thermostat output for auxiliary heat operation 24 VAC system common Service light thermostat connection 24 VAC system power input 24 VAC thermostat input for second stage compressor operation 24 VAC thermostat input for reversing valve operation 24 VAC thermostat input for first stage compressor operation

Low Ambient Thermostat Pins - P3 provides selection of the Y2 compressor lock-in temperature. The XP14 series heat pumps do not use a Y2 compressor and therefore these pins are not active. FIVE-STRIKE LOCKOUT FEATURE The internal control logic of the board counts the pressure switch trips only while the Y1 (Input) line is active. If a pressure switch opens and closes four times during a Y1 (Input), the control logic will reset the pressure switch trip counter to zero at the end of the Y1 (Input). If the pressure switch opens for a fifth time during the current Y1 (Input), the control will enter a lockout condition. The five-strike pressure switch lockout condition can be reset by cycling OFF the 24-volt power to the control board or by shorting the TEST pins between 1 and 2 seconds. All timer functions (run times) will also be reset. If a pressure switch opens while the Y1 Out line is engaged, a 5-minute short cycle will occur after the switch closes. Actuation When the reversing valve is de-energized, the Y1 circuit is energized, and the coil temperature is below 35°F (2°C), the board logs the compressor run time. If the board is not calibrated, a defrost cycle will be initiated after 30 minutes of heating mode compressor run time. The control will attempt to self-calibrate after this (and all other) defrost cycle(s). Calibration success depends on stable system temperatures during the 20-minute calibration period. If the board fails to calibrate, another defrost cycle will be initiated after 45 minutes of heating mode compressor run time. Once the defrost board is calibrated, it initiates a demand defrost cycle when the difference between the clear coil and frosted coil temperatures exceeds the maximum difference allowed by the control OR after 6 hours of heating mode compressor run time has been logged since the last defrost cycle. NOTE - If ambient or coil sensor fault is detected, the board will not execute the TEST mode. Termination The defrost cycle ends when the coil temperature exceeds the termination temperature or after 14 minutes of defrost operation. If the defrost is terminated by the 14-minute timer, another defrost cycle will be initiated after 30 minutes of run time. Each test pin shorting will result in one test event. For each TEST the shunt (jumper) must be removed for at least one second and reapplied. Refer to flow chart as illustrated in figure 25 for TEST operation. Test Mode When Y1 is energized and 24V power is being applied to the board, a test cycle can be initiated by placing the termination temperature jumper across the TEST pins for two to five seconds. If the jumper remains across the TEST pins longer than five seconds, the control will ignore the TEST pins and revert to normal operation. The jumper will initiate one cycle per test.

P2

Five position square pin header. P3 provides selection of the Y2 compressor lock-in temperature. Note: This is applicable for two stage compressor operations only. Six position square pin header. P4 provides connections for the temperature sensors: COIL (P4-5) Ground connection for outdoor coil temperature sensor. (P4-6) Connection for outdoor coil temperature sensor. (P4-3) Ground connection for outdoor ambient temperature sensor. (P4-4) Connection for outdoor ambient temperature sensor. (P4-1) Ground connection for discharge temperature sensor. (P4-2) Connection for discharge temperature sensor. Note: This is applicable for two stage compressor operations only.

P4

AMB

DIS

P5 P6

Two position square pin header. P5 provides selection of the 30-second compressor delay option. Eight position header. P6 provides connections for the factory test connections.

High Pressure Switch (HI-PS) When the high pressure switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike. DEFROST BOARD PRESSURE SWITCH SETTINGS S High Pressure (auto reset) - trip at 590 psig; reset at 418 psig. S Low Pressure (auto reset) - trip at 25 psig; reset at 40 psig.

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TEST

S S S S

JUMPER

Placing the jumper on the field test pins (E33) allows the technician to: Clear short cycle lockout Clear five-strike fault lockout Cycle the unit in and out of defrost mode

Place the unit in defrost mode to clear the coil When Y1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control's TEST pins for 2 to 5 seconds. If the jumper remains on the TEST pins for longer than five seconds, the Control will ignore the jumpered TEST pins and revert to normal operation. The Control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one second and then reapplied. Y1 Active

DEMAND DEFROST CONTROL (UPPER LEFT-HAND CORNER)

Place a jumper on TEST pins for longer than one second but less than two seconds.

Place a jumper on TEST pins for more than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable. No other functions will be executed and unit will continue in the mode it was operating.

Clears any short cycle lockout and five strike fault lockout function, if applicable.

ACTIVE

O Line Status

INACTIVE

If in COOLING Mode

If in DEFROST Mode

If in HEATING Mode

No further test mode operation will be executed until the jumper is removed from the TEST pins and reapplied.

The unit will terminate defrost and enter HEAT MODE uncalibrated with defrost timer set for 34 minute test.

If no ambient or coil sensor exist, unit will go into DEFROST MODE. If ambient or coil faults exist (open or shorted), unit will remain in HEAT MODE.

NOTE Placing a jumper on the TEST pins will not bring the unit out of inactive mode. The only way manually activate the heat pump from an inactive mode is to cycle the 24VAC power to the Control.

If jumper on TEST pins remains in place for more than five seconds.

If jumper on TEST pins is removed before a maximum of five seconds.

The unit will return to HEAT MODE un-calibrated with defrost timer set for 34 minutes.

The unit will remain in DEFROST MODE until termination on time or temperature.

Figure 25. Test Mode Page 21

XP14 SERIES

DEFROST BOARD DEFROST SENSOR HARNESS

AMBIENT SENSOR

Figure 26. Sensor Locations

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DEFROST BOARD DIAGNOSTICS See table 10 to determine defrost board operational conditions and to diagnose cause and solution to problems. Table 10. Defrost Control Board Diagnostic LEDs DS1 DS2 Green Red

OFF OFF

Condition/Code

Power problem

Possible Cause(s)

No power (24V) to board terminals R and C or board failure. Unit operating normally or in standby mode. Initial power up, safety trip, end of room thermostat demand.

Solution

1 Check control transformer power (24V). 2 If power is available to board and LED(s) do not

light, replace board. None required. None required (Jumper TEST pins to override)

Simultaneous SLOW Flash Alternating SLOW Flash Simultaneous FAST Flash Alternating FAST Flash ON ON

Normal operation 5-minute anti-short cycle delay Ambient Sensor Problem Coil Sensor Problem Circuit Board Failure

Sensor being detected open or shorted or out of temperature range. Board will revert to time/ temperature defrost operation. (System will still heat or cool). Sensor being detected open or shorted or out of temperature range. Board will not perform demand or time/temperature defrost operation. (System will still heat or cool). Indicates that board has internal component failure. Cycle 24 volt power to board. If code does not clear, replace board.

FAULT and LOCKOUT CODES

OFF OFF SLOW Flash ON SLOW Flash FAST Flash OFF Fast Flash SLOW Flash ON OFF OFF ON ON Fast Flash OFF Low Pressure Fault

(Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)

1 1

Low Pressure LOCKOUT High Pressure Fault High Pressure LOCKOUT Discharge Line Temperature Fault Discharge Line Temperature LOCKOUT Discharge Sensor Fault Discharge Sensor LOCKOUT

Restricted air flow over indoor or outdoor coil. 2 Improper refrigerant charge in system. 3 Improper metering device installed or incorrect operation of metering device. 4 Incorrect or improper sensor location or connection to system.

Remove any blockages or restrictions from coils and/or fans. Check indoor and outdoor fan motor for proper current draws. 2 Check system charge using approach and subcooling temperatures. 3 Check system operating pressures and compare to unit charging charts. 4 Make sure all pressure switches and sensors have secure connections to system to prevent refrigerant leaks or errors in pressure and temperature measurements.

This model does not have a defrost line sensor, therefore this code is not applicable.

The XP14 series units does not use a defrost line sensor. However, a resistor is installed across pins P4-1 and P4-2. If the resistor is missing or damage then this fault code will be displayed. This model does not have a defrost line sensor, therefore this code is not applicable.

Table 11. Sensor Temperature / Resistance Range

Sensor Outdoor (Ambient) Coil Temperature Range °F (°C) -35 to 120 (-37) to (48) -35 to 120 (-37) to (48) Resistance Values Range (ohms) 280,000 to 3750 280,000 to 3750 Pins/Wire Color 3 and 4 (Black) 5 and 6 (Brown)

Note: Sensor resistance decreases as sensed temperature increases (see figure 27).

100 90 80 TEMPERATURE (ºF) 70 60 50 40 30 20 10 0 10000 30000 50000 RESISTANCE (OHMS) 70000 90000 5750 7450 9275 11775 15425 19975 26200 34375 46275 62700 85300

Figure 27. Ambient and Coil Sensors Page 23

XP14 SERIES

Enter the TEST mode by placing a shunt (jumper) across the TEST pins on the board after power-up. The TEST pins are ignored and the test function is locked out if the shunt is applied on the TEST pins before power-up. Board timings are reduced, the low-pressure switch is ignored and the board will clear any active lockout condition. NOTE - The 30-second off cycle is NOT functional when jumpering the TEST pins. Ambient Sensor The ambient sensor (shown in figure 26) considers outdoor temperatures below -35°F (-37°C) or above 120°F (48°C) as a fault. If the ambient sensor is detected as being open, shorted or out of the temperature range of the sensor, the board will not perform demand defrost operation. The board will revert to time/temperature defrost operation and will display the appropriate fault code. Heating and cooling operation will be allowed in this fault condition. Coil Sensor The coil temperature sensor (shown in figure 26) considers outdoor temperatures below -35°F (-37°C) or above 120°F (48°C) as a fault. If the coil temperature sensor is detected as being open, shorted or out of the temperature range of the sensor, the board will not perform demand or time/temperature defrost operation and will display the appropriate fault code. Heating and cooling operation will be allowed in this fault condition. OPERATIONAL DESCRIPTION The defrost control board has three basic operational modes: normal, calibration, and defrost. Normal Mode The demand defrost board monitors the O line, to determine the system operating mode (heat/cool), outdoor ambient temperature, coil temperature (outdoor coil) and compressor run time to determine when a defrost cycle is required. Calibration Mode The board is considered uncalibrated when power is applied to the board, after cool mode operation, or if the coil temperature exceeds the termination temperature when it is in heat mode. Calibration of the board occurs after a defrost cycle to ensure that there is no ice on the coil. During calibration, the temperature of both the coil and the ambient sensor are measured to establish the temperature differential which is required to allow a defrost cycle. Defrost Mode The following paragraphs provide a detailed description of the defrost system operation. DETAILED DEFROST SYSTEM OPERATION Defrost Cycles The demand defrost control board initiates a defrost cycle based on either frost detection or time.

S

IMPORTANT - The demand defrost control board will allow a greater accumulation of frost and will initiate fewer defrost cycles than a time/temperature defrost system. Time If six hours of heating mode compressor run time has elapsed since the last defrost cycle while the coil temperature remains below 35°F (2°C), the demand defrost control will initiate a defrost cycle.

Maintenance

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Before the start of each heating and cooling season, the following service checks should be performed by a qualified service technician. First, turn off electrical power to the unit prior to performing unit maintenance. S Inspect and clean the outdoor and indoor coils. The outdoor coil may be flushed with a water hose. NOTE - It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, etc.) Visually inspect the refrigerant lines and coils for leaks. Check wiring for loose connections. Check voltage at the indoor and outdoor units (with units operating). Check the amperage draw at the outdoor fan motor, compressor, and indoor blower motor. Values should be compared with those given on unit nameplate. Check, clean (or replace) indoor unit filters. Check the refrigerant charge and gauge the system pressures. Check the condensate drain line for free and unobstructed flow; clean, if necessary. Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure. NOTE - If owner reports insufficient cooling, the unit should be gauged and refrigerant charge checked. Refer to section on refrigerant charging in this instruction.

S S S S S S S S

User Information

MAINTENANCE In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. 1. Air Filter Ask your Lennox dealer to show you where your indoor unit's filter is located. It will be either at the indoor unit (installed internal or external to the cabinet)

S

Frost Detection If the compressor runs longer than 30 minutes and the actual difference between the clear coil and frosted coil temperatures exceeds the maximum difference allowed by the control, a defrost cycle will be initiated.

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or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed. 2. Disposable Filter Disposable filters should be replaced with a filter of the same type and size. NOTE - If you are unsure about the filter required for your system, call your Lennox dealer for assistance.

IMPORTANT

Turn off electrical power to the unit at the disconnect switch before performing any maintenance. The unit may have multiple power supplies. 3. Reusable Filter Many indoor units are equipped with reusable foam filters. Clean foam filters with a mild soap and water solution; rinse thoroughly; allow filter to dry completely before returning it to the unit or grille. NOTE - The filter and all access panels must be in place any time the unit is in operation. 4. Electronic Air Cleaner Some systems are equipped with an electronic air cleaner, designed to remove airborne particles from the air passing through the cleaner. If your system is so equipped, ask your dealer for maintenance instructions. 5. Indoor Unit The indoor unit's evaporator coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. This would also apply to an auxiliary drain, if installed.

Cleaning of the outdoor unit's coil should be performed by a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your air conditioning or heat pump system. HEAT PUMP OPERATION Your new Lennox heat pump has several characteristics that you should be aware of: S Heat pumps satisfy heating demand by delivering large amounts of warm air into the living space. This is quite different from gas- or oil-fired furnaces or an electric furnace which deliver lower volumes of considerably hotter air to heat the space. S Do not be alarmed if you notice frost on the outdoor coil in the winter months. Frost develops on the outdoor coil during the heating cycle when temperatures are below 45°F (7°C). An electronic control activates a defrost cycle lasting 5 to 15 minutes at preset intervals to clear the outdoor coil of the frost. S During the defrost cycle, you may notice steam rising from the outdoor unit. This is a normal occurrence. The thermostat may engage auxiliary heat during the defrost cycle to satisfy a heating demand; however, the unit will return to normal operation at the conclusion of the defrost cycle.

In case of extended power outage...

The heat pump is equipped with a compressor crankcase heater which protects the compressor from refrigerant slugging during cold weather operation. If power to your unit has been interrupted for several hours or more, set the room thermostat selector to the Emergency Heat setting to obtain temporary heat without the risk of serious damage to the heat pump. In Emergency Heat mode, all heating demand is satisfied by auxiliary heat; heat pump operation is locked out. After a six-hour compressor crankcase warm-up period, the thermostat can be switched to the Heat setting and normal heat pump operation may resume. THERMOSTAT OPERATIONS Though your thermostat may vary somewhat from the description below, its operation will be similar. Temperature Setting Levers Most heat pump thermostats have two temperature selector levers: one for heating and one for cooling. Set the levers or dials to the desired temperature setpoints for both heating and cooling. Avoid frequent temperature adjustment; turning the unit off and back on before pressures equalize puts stress on the unit compressor. Fan Switch In AUTO or INT (intermittent) mode, the blower operates only when the thermostat calls for heating or cooling. This mode is generally preferred when humidity control is a priority. The ON or CONT mode provides continuous indoor blower operation, regardless of whether the compressor or auxiliary heat are operating. This mode is required when constant air circulation or filtering is desired.

IMPORTANT

Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit. 6. Outdoor Unit Make sure no obstructions restrict airflow to the outdoor unit. Leaves, trash or shrubs crowding the unit cause the outdoor unit to work harder and use more energy. Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit. When removing debris from around the unit, be aware of metal edges on parts and screws. Although special care has been taken to keep exposed edges to a minimum, physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury.

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XP14 SERIES

System Switch Set the system switch for heating, cooling or auto operation. The auto mode allows the heat pump to automatically switch from heating mode to cooling mode to maintain predetermined comfort settings. Many heat pump thermostats are also equipped with an emergency heat mode which locks out heat pump operation and provides temporary heat supplied by the auxiliary heat. Indicating Light Most heat pump thermostats have an amber light which indicates when the heat pump is operating in the emergency heat mode. Temperature Indicator The temperature indicator displays the actual room temperature. Programmable Thermostats Your Lennox system may be controlled by a programmable thermostat. These thermostats provide the added feature of programmable time-of-day setpoints for both heating and cooling. Refer to the user's information manual provided with your particular thermostat for operation details. Preservice Check If your system fails to operate, check the following before calling for service: S Check to see that all electrical disconnect switches are ON.

S S S S S S

Make sure the room thermostat temperature selector is properly set. Make sure the room thermostat system switch is properly set. Replace any blown fuses, or reset circuit breakers. Make sure unit access panels are in place. Make sure air filter is clean. Identify the unit model number before calling.

OPTIONAL ACCESSORIES Refer to the Engineering Handbook for optional accessories that may apply to this unit. The following may or may not apply: S Loss of charge kit S High pressure switch kit S Mild weather kit S Compressor monitor S Compressor crankcase heater S Mounting bases S Timed off control S Stand-off kit S Sound cover S Low ambient kit S Monitor kit S SignatureStatt room thermostat

Start-Up and Performance Checklist

Job Name Job Location Installer Unit Model No. Nameplate Voltage Rated Load Ampacity Maximum Fuse or Circuit Breaker Electrical Connections Tight? Indoor Blower RPM Vapor Pressure; Refrigerant Lines: Service Valves: Leak Checked? - Properly Insulated? Fully Opened? - Caps Tight? Outdoor Fan Checked? Voltage With Compressor Operating Calibrated? THERMOSTAT Properly Set? - Level? Indoor Filter clean? Supply Voltage (Unit Off) Outdoor Coil Entering Air Temp. Compressor Amperage: Serial No. Job no. City City Date State State Service Technician

S.P. Drop Over Indoor (Dry)

SEQUENCE OF OPERATION Heating Correct? Cooling Correct? -

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