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Installation Operation Maintenance Odyssey

Air Cooled Split System Unit 50 Hz

SSA-SVX03A-EN 3000-0898-05


Important Note: installation procedures should be performed in the sequence that they appear in this manual. This manual is customer's property. Do not destroy or remove the manual from the unit. The manual should remain weather protected with the unit until all installation procedures are completed. Warning: Open and lock the disconnect switch before attempting any installation or maintenance. Failure to do so will cause severe injury even to death for electrical shock or contact with moving parts. Note: It is not the intention of this manual

to cover all possible variations in systems that may occur or to provide comprehensive information concerning every possible contingency that may be encountered during an installation. If additional information is required or if specific problems arise that are not fully discussed in this manual, contact your local Sales office. Note: Warning and Cautions appear at appropriate places in this manual. Your personal safety and the proper operation of this machine require that you follow them carefully. The Company assumes no liability for installation or servicing performed by unqualified personnel.

Contents Model Nomenclature Dimensional Data Reception

Suspension Recommendations and Installation Preparations

1 2 4 8 9 10 12 16 17 18 20 23 27

Location of the Unit Refrigerant Piping Refrigerant Charging Procedures Drainage Piping and Ductwork Field Wiring Instructions Thermostat Installation and its Operation Guide Field Wiring Layout/Detailed Diagram Wiring Diagram


Model Nomenclature (Indoor Unit)


Model Nomenclature (Outdoor Unit)


Dimensional Data (Indoor Unit)


D Duct flange



Horizontal (ceiling suspended)

26.8 Dia.PVC40 A water connection (X 2) (Horizontal Installation) b

22.23 Dia. prepared hole (single point wire entry)

c 12.7 panel depth (the same depth of all)

Return air opening AF (specified) AE Return air opening Vertical Return air



T Min. clearance for filter removal (both ends)

d P

22.23 Dia. prepared hole (low voltage entry) 22.23 Dia. prepared hole (high voltage entry)

AJ Return air opening AG (specified) AH Return air opening Horizontal Return air Note: a,b,c,d-22.23 Dia prepared hole (x 4) (horizontal suspension) AK

W 26.8 Dia.PVC40 water connection (X 2) (Vertical Installation)

50.80 Dia. prepared hole (suction lines- both ends) 22.23 Dia. prepared hole (liquid line-both ends)

MODEL TWE075 TWE120 Model TWE075 TWE120 AC 406 406

A 1372 1372 AD 43 43

B 1207 1613 AE 1061 1468

C 635 635 AF 73 73

D 300 503 AG 73 73

E 607 607 AH 1060 1468

F 408 408 AJ 178 178

P 1147 1553 AK 406 406

R 937 937

T 560 560

W 30 30

Y 168 168

Figure 1 TWE 075/120(mm)


Dimensional Data (Indoor Unit)



a Duct flange


Horizontal (ceiling suspended)

A 33.4 Dia.PVC40 water connection (X 2) (Horizontal Installation) b c

AP AB Specific dimension Duct opening AA AM AN Duct opening (outside) Return air opening AL AC

12.7 panel depth (the same depth of all) T Min. clearance for filter removal (both ends) d P 22.23 Dia. prepared hole (single point wire entry) 22.23 Dia. prepared hole (low voltage entry) 22.23 Dia. prepared hole (high voltage entry) 33.4 Dia.PVC40 water connection (X 2) (Vertical Installation)

Vertical return air

AK Duct opening AJ Specific dimension AF AH Duct opening (outside) Return air opening AE AG


22.23 Dia. prepared hole (liquid line-both ends) 50.80 Dia. prepared hole (suction lines- both ends) 22.23 Dia. prepared hole (liquid line-both ends)


Horizontal return air

Note: a,b,c,d-22.23 Dia prepared hole (x 4) (horizontal suspension)

MODEL TWE150 TWE240 Model TWE150 TWE240 AA 891 999

A 1751 1824 AB 71 124

B 2019 2350 AC 87 78

C 702 773 AD 90 76

D 282 447 AE 891 999

E 1456 1456 AF 891 999 AG 96 116

F 408 408 AH 1876 2105

P 1960 2266 AJ 73 122

R 1219 1291 AK 457 508

T 660 790 AL 891 999

W 30 42 AM 96 116

Y 242 242 AN 1876 2105 AP 457 508

Figure 2 TWE 150/240(mm)


Dimensional Data (Outdoor Unit)

Clearance Distance 915mm minimum A



B Clearance Perimeter 915mm minimum

Control Box

Service Access 1070mm minimum



Clearance Distance 915mm minimum

45mm Dia. Hole (High Pressure) 22.23 Dia. Hole (Control Wiring)

107 30.6 Top Discharge 2540mm minimum Control Box Access Panel

Compressor Access Panel 123 C 68 F G

H D 31.75 Lifting Hole


E 22.23 Dia. Extruded Hole 38.1 Dia. Extruded Hole 762 847

11.11 Dia. Footing



Figure 5 TTA/TWA 075/100

A 1300 1300

B 965 965

C 983 1133

D 1240 1240

E 652 652

F 678 678

G 767 767

H 329 329

J 252 252


Dimensional Data (Outdoor Unit)



4 Clearance Perimeter 915mm minimum



1 Control Box Access Panel

Note: Minimum clearance for proper operation is 915mm from walls, shrubbery, privacy fences, etc. Minimum clearance between adjacent units is 1830mm 44.45 Dia.(power wiring) 22.23 Dia.(Control Wiring)

2" /38.1 Dia.( Refrigerant Gauge Fitting access) C



38.1 Dia. Extruded Hole(Suction Lines) View "A" 22.23 Dia. Extruded Hole (Liquid Lines)

Top Discharge 2540mm minimum

D G 762 997 View "B"


A 2375 B 1118 C 1137 D 651 E 224 F 256 G 2313

Figure 6 TTA /TWA 150/200/240



General Information:

This manual includes outdoor unit installation procedures for TTA/TWA075, TTA/TWA100 single circuit system, TTA/TWA150, TTA/TWA200, TTA/TWA240 dual circuit system and dual circuit manifold system. This manual also covers the installation of the TWE075, TWE120 (single circuit) and TWE150, TWE240 (dual circuit) air handlers. These new air handlers are completely redesigned to incorporate a single slab coil assembly, improved application flexibility, serving and maintenance accessory line. All these accessories are convertible for horizontal or vertical configuration. Note: For TWE075 and TWE120 air handlers, the supply air plenum can be rotated 180 degrees.

Reception Checklist

To protect against loss due to damage incurred in transit, complete the following checklist upon receipt of the unit. · Inspect individual pieces of the shipment before accepting the unit. Check for obvious damage to the unit or packing material. · Inspect the unit for concealed damage before it is stored and as soon as possible after delivery. Concealed damage must be reported within 15 days. If concealed damage is discovered, stop unpacking the shipment. Do not remove damaged material from the receiving location. Take photos of the damage if possible. The owner must provide reasonable evidence that the damage did not occur after delivery. · Notify the carrier's terminal of damage immediately by phone and by mail. Request an immediate joint inspection of the damage by the carrier and the consignee. · Notify the sales representative and arrange for repair. Do not repair the unit until the damage is inspected by the carrier's representative.

Note: An "Installation Checklist" is provided at this manual. Use the checklist to verify that all necessary installation procedures have been completed. Do not use the checklist as a substitute for reading the information contained in the manual. Read the entire manual before beginning installation procedures.


Inspect material carefully for any shipping damage. If damaged, it must be reported to, and claims made against the transportation company. Compare the information that appears on the unit nameplate with ordering and submittal data to insure the proper unit was shipped. Available power supply must be compatible with electrical characteristics specified on component nameplates. Replace damaged parts with authorized parts only.

Initial Leak Test

All outdoor units are shipped with a holding charge of nitrogen in each circuit. Remove the compressor access panel(s) shown in Figure 5 through Figure 6. Locate the liquid line or suction line service valve for each circuit. Install gauges to determine if the circuits are still pressurized. If not, the charge has escaped. Repair as required to obtain a leak-free circuit.


Suspension Recommendations and Installation Preparations

Table 1-Total indoor unit weight and corner weights (kg)

Corner weight #1 #2 38 38 38 38 47 47 45 49 83 83 84 76 98 98 90 109

j .Knife or wire stripper k. Tape measure

#3 38 38 47 49 83 91 98 106 #4 38 38 47 45 83 82 98 87

Model Number TWE075 TWE120 TWE150 TWE240

Configuration Vertical Horizontal Vertical Horizontal Vertical Horizontal Vertical Horizontal

Gross maximum 169 169 210 210 359 359 420 420

Net maximum 150 150 185 185 330 330 390 390

2. Refrigerant Piping, Electrical Wires and Insulation Material . a .Refer to technical data to purchase the refrigerant piping or order them from the factory. b .The thickness of insulation material must be proper, if not it will cause condensate. c. Check local electrical codes and regulations before buying any wire. Also check for any specific wiring instructions or limitations. 3. Additional materials required for installation a. Saddles or clamps to secure refrigerant piping b .Insulated clamps or staples for connecting wire. See local codes. c. Ceiling mount: use nuts and bolts as required to mount the unit of the ceiling. Use 4(3/8") fasteners or closest standard metric nuts and lock washers. The length will vary with application. d. Refrigerant oil and insulation tape. e. Putty or similar filler. f .Expansion bolts for ceiling mounting.

Table 2 Total outdoor unit weight and corner weights (kg)

Model Number TWA075 TWA120 TWA150 TWA200 TWA240 Gross maximum 265 285 525 580 590 Net maximum 205 235 435 490 500 Corner weight #1 #2 68 78 111 145 148 58 63 102 147 150 #3 35 51 106 99 101 #4 43 33 115 99 101

Suspension Recommendations

Before preparing the unit for lifting, estimate the approximate center of gravity for lifting safety. Due to the placement of the interior components, the unit weight may be unevenly distributed. Table 1 and Table 2 show the approximate weights of indoor unit and outdoor unit separately. Warning: On-sight lifting equipment must be capable of lifting the unit weight with an adequate safety factor. The use of under-capacity lifting devices may result in severe personal injury or death and can seriously damage the unit. The crated unit can be moved using a forklift of suitable capacity. For lifting the unit, attach lifting straps or slings securely to the lifting holes at each corner. Use spreader bars to protect the unit casing from damage. Test lift the unit to determine proper balance and stability. Caution: Use spreader bars to prevent lifting straps from damaging the unit. Install bars between lifting straps. This will prevent the straps from crushing

the unit cabinet or damaging the unit finish. Warning: open and lock unit disconnect switch to prevent injury or death from electric shock or contact with moving parts before attempting any installation or maintenance.

Installation Preparations

Following is a brief outline of where and how to install the unit. Please read over the entire set of instructions for indoor and outdoor units and make sure all the accessory parts listed are with the unit before beginning. 1. Tools required for installation (not supplied) a. Level b. Hole saw or saw c .Core bits d. Hammer e .Drill f .Torque wrench g. Adjustable wrench h. Standard screwdriver i .Phillips head screwdriver


Location of the Unit (Indoor unit)

The location of air handler is usually determined by constructer, contractor or customer. Take the following points as consideration for proper installation: a. Available power supply must be compatible with electrical characteristics specified in the unit nameplate. b. Ensure enough installation space around the unit for some accessories. c. All ducts must be properly insulated to prevent heat or cool loss. d. Refrigerant piping must be properly insulated. Caution: All refrigerant lines must be properly insulation to prevent the condensate water contamination, poor

performance and possible damage to compressor. Refer to unit outline drawings (Figure 1 & 2), unit accessory drawing (Figure 3 & 4) and the above dimensions. Inspect the installation location again. Predetermine the prepared holes for use and adequate clearance for installation and maintenance.

The overall unit weight is shown in Table 1. Caution: Before the unit is lifted to the suspension beam, a larger ring is required to strengthen the prepared holes in the unit casing. The ring should be placed between the unit t casing and the expansion nuts. Install the suspension beams to the structure securely and then install the air handler to the support. Line up the provided holes in the casing with the structure support. If not, it is necessary to field add a beam to the structure. Warning: The ceiling structure should be strong enough to support the unit weight and its accessories.

Horizontal Ceiling Installation

If the air handler is installed horizontally (See Figure 7), the unit should be isolated from the structure with a suspension device. Usually use the field-supplied springs or rubber vibration isolation pad. Suspension beams should also be field fabricated. The type of isolation pad required is determined by the unit weight.



Figure 7 Illustration of horizontal suspension mounting

Location of the Unit (Outdoor unit)

Installation clearances

Provide enough space around the unit to allow unrestricted access to all service points. Refer to unit dimensional data (Figure 5 & 6) for minimum required service and free air clearances. Observe the following points to insure proper unit operation. a. Don't install the unit under low shield. Keep discharge air freely. Refer to Figure 5 and 6. Important: Don't block discharge air. This can result in warm air recirculation through the coil. b. Don't locate the unit in a position where runoff water can drop into the fan discharge openings. c. Unit should be positioned properly, where the vapor from the unit while deforesting may not condense or freeze on windows, shield or close buildings. d. Intake air can be supplied from three sides of unit. Refer to Figure 5 and 6 for required minimum clearance.

Rooftop Mounting

If the unit is roof mounted, be sure the structure is strong enough to support the overall weight of the unit and all accessories. Refer to Table 2 for unit weight detailed. Warning: Ensure the structure is strong enough to support the gross weight of unit and its accessories. Failure to do will result in severe injury or death and can seriously damage the unit and building. The unit should be elevated on a horizontal, field-fabricated 102 mm steel frame or 100X100 mm wooden mounting frame. Complete the frame and fix it firmly on the roof before lifting the unit to the roof. The frame must support a minimum of three of the unit's four sides and can span the roof supports to distribute the load on the roof.

Ground Level Mounting

The unit base should be adequately supported and hold the unit near level. Any ground level location must comply with the required clearances in Figure 5 and 6. Place the unit on a 102 mm cement support plate. The support should extend 51mm beyond the unit base channel at all points. The unit and support should be isolated from any adjacent structure to prevent possible noise or vibration problem.

Snow Ground Installation Recommendations

The unit should exceed the direct installation base at least 203-305mm in frequently snowy region for preventing the heat exchanger from blocking by snow and making condensate water drain freely. Do not place unit where snow may be accumulated. Remove snow as soon as possible to avoid the great loss of heating capacity. Install baffle to avoid snow accumulate around the unit. Refer to Figure 5 and 6 for the clearance between baffle and unit.


Refrigerant Piping

TWE Unit

The final installation location is determined by service access, the weight distribution on the building, electrical wiring,refrigerant piping and condensate water drainage, etc. All refrigerant line connectors should be placed inside of the unit casing. And the refrigerant lines enter the unit casing through the provided holes.

Right hand bend (optional) Diameter 50.8 Diameter 19.05 Left hand bend (as standard)

Figure 8

Note: refrigerant line connection of TWE air handler is convertible for the left hand or right hand according to the original design. TWE air handler is configured as left hand connection in factory. For right hand connection, braze away the bend in suction line, rotate it 180 degree and braze it again. (Refer to Figure 8 and Figure 9) Caution: The air handler is charged with dry nitrogen in factory. Don't release it before interconnecting refrigerant lines.

Right hand bend (optional) Diameter 19.05 Diameter 50.8 Left hand bend (as standard)

Figure 9


Refrigerant Piping

Installation Note

Make a diameter of 65mm hole in the wall to route tubing and wiring through a locally purchased PVC sleeve. The hole should slope downwards slightly towards the outside (Shown in Figure 10). Before cutting, check that no pipes or studs are directly behind the place to be cut. Avoid areas where electrical wiring or conduits are located. 1. In the single circuit air handler, you can find a bag attached to refrigerant line. There are two copper clamps, a 230mm (L) x 100mm (W) insulation strap inside the bag, which are used to fix the sensor bulb of thermal expansion valve to the suction line and then wrap them for insulation. For dual circuits air handler, there are two bags (Refer to Figure 11). 2. For the left hand refrigerant connection,

remove the rubber ring of the prepared hole in the casing and straighten the capillary tube of expansion valve and sleeve the ring. Then, let the sensor bulb go through the prepared hole and replace the ring at the original position. The single circuit unit is equipped with one capillary tube with the sensor bulb, and the dual circuits unit is equipped with two. The sensor bulb should be positioned at 45degree angle to the vertical direction and 250mm-300mm far from the indoor unit. 3. For the right hand refrigerant connection, the sensor bulbs should be placed on the suction line inside of the unit. Follow the above procedures and place it 250mm far from the right end of the unit casing. 4. Whether the sensor bulbs are placed inside or outside of the unit, wrap and

insulate it after the installation is completed. Insulate the whole refrigerant lines. Caution: Ensure that the refrigerant lines going through the unit casing should not touch the sharp sheet metal edges. Note: If the sensor bulbs have been pre-installed on the suction line in factory, 4 procedures above is unnecessary.

Lower 5-10mm

Wall pipe Inside Outside


Figure 10

ATTENTION After refrigerant lines completed, the sensor bulb of expansion device should be fixed on the suction line correctly for proper unit performance. For dual circuits unit, the bulbs should be fixed on the related suction lines correctly.

Suction line 12 9:00 8:00 9 6 3 3:00 4:00

Position of the sensor bulb

Figure 11 Illustration of horizontal suspension mounting


Refrigerant Piping

Structural Preparation for Outdoor Unit

Holes must be made in the structure to run refrigerant lines. For the majority of ground-level installations, the holes can be made in the header that rests on top of the foundation. Alternatively, these holes may also be made in the foundation itself. On roof-mounted units, refrigerant lines should enter the building as close to the unit as possible; preferably within 76 to 102 mm of the refrigerant connection on the unit, plus a 152 mm (long radius) 90 degree ell entering the building(See Figure 12).

Outdoor Unit Insulated Gas Line Insulated Liquid Line R152 long radius

Refrigerant Piping Guidelines

a. Recommended line sizes:

Suction line

Liquid line (without subcooler)

1-3/8"L type sealed refrigerant line 1/2"L type sealed refrigerant line

b. Insulate all refrigerant lines and joints c. Pitch all horizontal suction lines down towards the unit to assist gravity oil drainage back to the compressor. d. Avoid creating large oil traps in horizontal suction lines as this will reduce oil circulating in the system and may eventually lead to failure of the compressor. e. A small oil trap at the end of a horizontal suction line before a long vertical riser (of more than 4 meters) has the advantage of assisting the high velocity gas to carry the oil up the vertical pipe.

Unit Base channel Elevation (mounting frame)

Roof Construction Roof Trussing


Figure 12 Rooftop Mounted Unit


Refrigerant Piping

Refrigerant Piping Procedures (Outdoor Unit)

Each unit ships with a fully charge. Due to this minimal amount (about 500 g), we recommend that it be removed and the entire system evacuated (at the proper time) to avoid possible contamination. 1. Remove the compressor service access panel. 2. Find the liquid and suction line service valves. Check that the piping connection stubs on the valves line up properly with the holes in the unit cabinet. 3. Puncture the seal cap on the service connection stubs to release remaining refrigerant and nitrogen (See Figure 13).

4. Heat and remove the seal cap and open the service valve slowly to release the Nitrogen from the unit. Caution: Do not remove the seal caps from refrigerant connections before unit prepared to braze refrigerant lines to the connections. Excessive exposure to atmosphere may allow moisture or dirt to contaminate the system, damaging valve seats and causing ice format ion in system components. 5. Cut, fit and braze tubing, starting at the outdoor unit and work toward the indoor unit. Note: Use long radius ells for all 90degree bends. All brazing should be done using 14 to 56kPa dry nitrogen purge flowing through the pipe being brazed (See Figure 14).

Leakage Test

After the brazing operation of refrigerant lines to both the outdoor and indoor unit is completed, the field-brazed connections must be checked for leaks. Pressurize the system through the service valve with dry nitrogen to 1.4MPa. Use soap bubbles or other leak-checking methods to ensure that all field joints are leak free. If not, release pressure, repair and repeat leak test (See Figure 14).

Charging Port

sharp tool

seal cap

Caution: Wet-wrap all valves and protect painted surfaces from excessive heat. Heat can damage system components and the units finish. Note: Don't install drier filter on suction and liquid lines outside the unit Refrigerant flood back will bring drying media or contamination to other components, which damage compressor, reversing valve and expansion valve etc. Note: Install a pressure-regulating valve between the nitrogen source and the gauge manifold (See Figure 14). Unregulated pressure will damage the unit components.

Manifold Gauge

pressure regulating valve

Figure 14

connection stub

Figure 13

Warning: Do not heat the seal caps unless they have been punctured. If caps are intact, application of heat may generate excessive pressure in the connection stub, causing personal injury or death due to rupturing of components and damage to the service valve.


Refrigerant Charging Procedures

Note: Table 3 Refrigerant Charge (R407C)

Outdoor unit model TWA075 TWA100 TWA150 TWA200 TWA240 Indoor unit model TWE075 TWE120 TWE150 TWE240 TWE240 Refrigerant charge 8800g 9800g 17500g 19200g 20800g

1. Ensure gaseous refrigerant to be charged during the charging progress. 2. Charge sufficient operating amount for normal performance of unit.

Refrigerant Line Insulation and Isolation

Insulate the suction line and refrigerant tubes together, and also insulate liquid lines exposed on extreme temperature. Insulate liquid and suction line separately and isolate them from each other. Isolate all refrigerant tubes from the structures and air ducts. Note: Isolate the refrigerant tubes from the building to avoid possible noise and vibration.

Note: (1) Adequate charge amount for outdoor unit with recommended 7.6m-length refrigerant tube. (2) Actual charge refers to the nameplate.

Unit Evacuation

1. Evacuate the unit after leakage test. 2. Attach appropriate hoses from manifold gauge to suction and liquid line charging port (See Figure 15).

Charging Port

3. Connect the center hose of manifold gauge to a vacuum pump. 4. Evacuate the unit to hold a 46Pa vacuum. 5. Close the valve to the vacuum pump and observe the gauge. If gauge pressure rises above 66Pa within a minute, it indicates that the vacuum is not completed or the system has a leak. 6. If the gauge pressure does not rise above 66Pa within a minute, it indicates that the vacuum is completed.

Charging Port

Manifold Gauge

Figure 15

Note: Unnecessary switching of hoses can be avoided and complete evacuation of all lines leading to sealed system can be accomplished with manifold center hose and connecting branch hose to a cylinder of R407C and vacuum pump.

Figure 16

Manifold Gauge



Drainage Piping and Ductwork

The position of return air opening, filter and the drainage piping connection is different between the horizontal and vertical installation of the unit (See Figure 17).

Condensate Drain Piping

After deciding either horizontal or vertical installation, seal the other water outlet with the seal cap factory supplied with the unit. Use PVC glue (field supplied) to stick the seal caps correctly. 1. The drain hose should go straight down the wall to a level where the runoff will not stain the wall. 2. There should be no water traps. Avoid putting the end of the hose in water. Note: When the unit is either horizontally or vertically installed, water trap of close distance is required. It is recommended to raise the base or support foundation of unit to form water traps. See Figure18 for the water trap.

3. To conveniently drain the system, drain piping must slant downward with a slope of at least 1:50 to avoid leakage. 4. When the drain hose is placed in the room, insulate the hose with foam polyethylene to avoid damage to the ceiling or furniture. 5. After completing the installation of refrigerant tubing, wiring and drain connection, bind the tubing, wiring and drain piping (check if local codes permit) into a bundle with a tape at 100mm200mm (4" ~ 8") intervals. Be sure that the drainpipe should be placed at bottom of the bundle (See Figure 19).

Supply air opening



Washable filter is factory equipped with the unit. To clean or replace the filter, remove the service access panel at the bottom (or end) of unit and pull out the old filter to wash or replace it with new filter.

Return air opening

Drain pan

Drain hose

Vertical installation

Ductwork Connection

Filter Supply air opening

Return air opening

Flame-retarded duct connector should be used to reduce the transmission of vibration. Return air duct should be matched the return air opening of unit in size. Important Note: The unit is equipped with air duct flange. For TWE075 and TWE120 units, the flange is supplied but not installed on the unit. The control cabinet is in left hand facing the unit. Remove the service access panel in the front of the unit. The flange is located in the close unit bracket panel. Remove the screws to get flange and replace the service access panel. Fix the flange in the prepared holes with field provided screws.

Drain pan

Drain hose

Horizontal installation Figure 17

Min 101.6mm

Min 69.85mm

Figure 18 Water Trap Assembly


Field Wiring Instructions

Warning: Follow the basic safety precautions at any attempt of installation and maintenance. Failure may result in serious personal injury or death.

Field wiring

Field wiring includes providing power supply to the unit, installing indoor thermostat for indoor unit and internal low voltage wring. Refer to Figure 5 and 6 for access to electrical connection locations.

1. All electrical wiring, wire diameter, wiring protection and grounding should comply with the national and local electrical codes and regulations. 2. If wiring conduits are applied, the measures should be taken to avoid noises caused by transmission of vibration of the building structure. 3. Ensure all the wiring is tight and no wire is naked.

P.V.C tape

Insulation pipe

Wiring of the Indoor Unit

Suction line Insulation pipe Liquid line P.V.C conduit Drain hose of condensate water (P.V.C pipe) Control wiring Power supply with grounding

The power wiring (380-400V/3~) of TWE indoor unit and interconnecting wiring of internal low voltage terminals should enter to the control box located besides the left fan of the air handler. The wiring enters the unit through the prepared holes. (Shown in Figure 20) Refer to the data on the unit nameplate to select disconnect switch and fuse specifications. See the follow wiring diagrams for detailed.

Figure 19


Prepared hole

Unit power entrance

Low voltage, exterior High voltage, interior

Figure 20


Field Wiring Instructions




Thermostat Installation and Its Operation Guide

Function Key Description Thermostat A

Hold Key is used to hold a temperature set or activate a preset program LCD display Screen Temperature plus

E. Temperature set hold Push Hold key to hold an uncertain temperature. When the Hold key is activated, "Hold" will display on the screen. Push Hold key again will cancel it. 1. Push Hold key 2. Push " " and " " keys to set an uncertain temperature. Note: The uncertain temperature will be valid until the Hold key pushed again. F. Minimum time delay function The minimum time delay function built in the thermostat can inhibit the compressor to be started again in 5 minutes. When the compressor stopped, the time delay function works if changing the position of System Switch or resetting the temperature. It also works when being energized again after sudden power loss. The delay function is inactivated only at the operation of "Select System Check". G. Warning Starting the unit when the outdoor temperature is too low will damage the compressor. It is not allowed to set the unit in cooling mode when the outdoor temperature is lower than 10oC.

Time Set

Temperature minus

Fan Switch

System Switch

User's Operation

A. Slide the Fan and System switches at the bottom of the thermostat to set the run mode of fan and system respectively. 1. Fan Switch mode set: Auto: Normal set for most families. In this set, fan and system start or shut down simultaneously. On: Fan runs continuously to circulate air and improve indoor air quality (System Switch should be at Off position) 2. System Switch mode set: Cool: system works in cooling mode Off: shut down the heating or cooling system Heat: system works in heating mode Em.Ht and Aux.Ht indication: When slide the system switch to Em.Ht, arrow " " on the screen direct to Em.Ht. When arrow " " direct to Aux.Ht on the screen, it indicates that Aux.Ht is working. B. Set current time and date 1. Push the SELECT key twice, and then set the current time by push " " and " "keys. The SET word will display on the screen when setting. 2. Push the SELECT key once more, and then set the current date by push " " and " " keys. C. Programmable (Refer to related contents in instruction) D. Set a temporary temperature Push the " " and " " keys to set a temporary temperature. Note: The temporary temperature will display on the screen for about 3 sec., and it will be valid until the next program runs. Push the Hold key twice to cancel the setting.


Thermostat Installation and Its Operation Guide

Function Key Description Thermostat B

AUTO: When in AUTO mode, the system changes operation mode (cooling or heating) automatically according to temperature set. KEY : (optional outdoor temperature)

If there is outdoor temperature option, push button and will display on the screen. Otherwise, "--" will display on the screen. KEY: (DAY/NIGHT)

When thermostat is in active, the symbol of the day temperature will display on the screen. Push button or energize Terminal CLK1 and CLK2 (customer wiring) on the back of thermostat to select day or night temperature. (The Thermostat will remember this temperature.) Push the button will alternate to set those two temperature.

COOL: Mode: Push the MODE key to choose the operation modes: -cooling mode (COOL will display on the screen for 5 seconds) -heating mode (HEAT will display on the screen for 5 seconds) -Automatic changeover mode (AUTO will display on the screen for 5 seconds) -Emergency auto heating mode (Eht will display for 5 seconds) OFF - Shut down the thermostat and system In cooling mode, push the " " and " " key to select temperature. HEAT: In heating mode, push the " " and " " key to select temperature. FAN: Fan runs automatically when the unit start: if fan needs running continuously, push the button and will display on the screen. OFF: System cannot be operated while "OFF" displays on the screen. Don't use OFF mode in cold season to prevent the coil from freezing.

Remote Temperature Sensor (Option):

RS1-RS2-RS+V If remote temperature sensor installed, the thermostat can be placed anywhere.


C/oF Push down " " and " " buttons simultaneously can change temperature display in oC or oF.





- 3-phase power, 4-line power 3-line

5 B


A - 3-phase power, 4-line




- 3-phase power, 4-line power 3-line









Literature Order Number File Number Trane A business of American Standard Companies Supersedes Stocking location

SSA-SVX03A-EN (Jun 2005) New Taicang

For more information, contact your local district office

TRANE has a policy of continuous product data and product improvement and reserves the right to change design and specifications without Note.



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