Installing Glycerine Solution in Product Simulation Bottle
1. Remove the bottle from the bracket located in the upper left side
of the refrigerator
(Fig. 12).
2. Remove the top and fill the bottle with a 50/50 solution of glycerine
and water.
3. Replace the top (and probe).
4. Reinsert bottle into the bracket.
Note: If you are using this in a food service application, and installing in
accordance with NSF, you must remove the probe from the bottle.
NSF requires that air temperature be displayed.
Fig. 12
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 temperature falls below the controller cut-out temperature, the controller turns the
refrigeration system off. The controller contacts reopen, which de-energizes the evaporator fan motor and solid-
state control relay which de-energizes the condensing unit (compressor and condenser fan motor).
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 38 – 42 F
(3.3 – 5.5 C). If desired, the set-point temperature can be raised as high as 50 F (10 C) by following the
instructions in Controller Operation on page 8 for changing the temperature set point. The 3 F differential will be
maintained regardless of the controller set point.
Defrosting
Precision series 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 38 F (3.3 C) or after 30 minutes.
REF4P and REF5P Undercounter Refrigerators 7
REUC235
