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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 evaporator fan
continuously runs to acheive desired product temperature.
Any accumulated frost on the evaporator coils melts during the electric defrost 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 –28 C (–18 to F). If
desired, the set-point temperature can be raised as high as –17 C (0 F) by following the instructions in Controller
Operation on page 6 for changing the temperature set point. The 2.2 C (4 F) differential will be maintained
regardless of the controller set point.
Defrosting
The Performance Plus freezer is equipped with an electric defrost to keep the evaporator frost free. Defrost cycle
terminates after 30 minutes or when the evaporator reaches 5 C (41 F) as read via the P2 (defrost) probe.
FZR4P, FZR5P and FZR5PLP-T Undercounter Freezers
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