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BULLETIN NUMBER: CATEGORY: BULLETIN: DATE: BTB-REF-CTL Hardware BASYX Refrigeration Control Scheme June 6, 2007

Technical Bulletin

The BASYX system can provide control of coolers and freezers in convenience store applications. There is always concern when controlling equipment when perishable products are involved, and substantial loss of said product and associated cost is a possibility upon a failure of the control system. TMS recognizes the issues involved with this type control, and utilizes redundant control strategies when applying our controls. All existing thermostats remain in the circuit as provided under the initial installation, and the BASYX system controls a relay in parallel with the existing thermostat. The existing thermostat setting is adjusted to approximately 8-10 degrees higher than originally set, and the BASYX system controls the relay to maintain normal operating conditions. If the BASYX system fails, the temperature will rise to a point where the existing thermostat will control as originally designed, albeit at a higher temperature. This strategy insures that product integrity is maintained, regardless of the BASYX operating condition. Below is a typical wiring diagram showing the physical interface:

N.O.

YELLOW ORANGE

COOLER CONTROL CIRCUIT

RED BLACK

WHT/BLUE WHT/YEL

EXISTING COOLER THERMOSTAT

ADJUST SETPOINT UP 8-10 DEGREES FROM ORIGINAL

COOLER CONTROL RELAY

CONNECT IN PARALLEL WITH ELECTRIC THERMOSTAT

RIBU1C

ELECTRIC THERMOSTAT

FROM BASYX CONTROLLER (24VAC)

Please contact our office if you have questions concerning any portion of this bulletin.

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