Operation
The temperature control board and probe indicate when the refrigeration system is required to turn on and off.
The refrigeration system removes heat from the cabinet interior and rejects it to the surrounding room air.
When the cabinet interior temperature rises above the controller cut-in temperature, the controller turns the
refrigeration system on. The controller energizes the evaporator fan and solid-state control relay which energizes
the condensing unit. The compressor uses a current-style starting relay and a starting capacitor to start the
compressor motor.
When the cabinet interior falls below the predetermined cut-out temperature, read by the P1 (control probe), the
controller de-energizes the solid state compressor relay and condenser fan motor. The additional evaporator fan
run-time is dependent upon the delay setting programmed within the controller menu.
Any accumulated frost on the evaporator coils melts during the off cycle. The condensate drains out of the unit
to the condensate tray to the left of the condensing unit. The heat from the condensing unit evaporates any
condensate in the drain pan.
Temperature Control
The temperature control system is preset by the factory to maintain a cabinet temperature of 3.3–5.5C
(38–42F). If desired, the set-point temperature can be raised as high as 10 C (50F) by following the instructions
in Controller Operation on page 8 for changing the temperature set point. The 2.2C differential will be maintained
regardless of the controller set point.
Defrosting
Performance Plus undercounter refrigerators do not require manual defrosting. The unit cooler defrosts
automatically when the condensing unit is in the OFF cycle and during an off time defrost every 8 hours. The
defrost will terminate when the evaporator temperature reaches 3.3 C (38 F) or after 30 minutes.
REF4P, REF5P and REF5BBP-T Undercounter Refrigerators 13
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