Follett FZR5-PL Series Installatie-, Bedienings- en Onderhoudshandleiding - Pagina 9

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Operation –––––––––––––––––––––––––––––––––––––––––––––––––––––––––

The temperature controller 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 reaches +2 C (+4 F) above the controller set point, the probe signals the controller to

turn the refrigeration system on. The normally-open controller contacts 2 and 3 close and energize the evaporator

fan motor, door heater, and control relay that energizes the condensing unit (condenser fan motor and compressor).

The snowflake and fan LEDs on the controller will light to indicate that the refrigeration system is on. The

compressor uses a current-style starting relay and a starting capacitor to start the compressor motor.

When the cabinet interior temperature falls to the set point, the probe signals the controller to turn the refrigeration

system off. The controller contact 3 reopens, which de-energizes the control relay and turns off the condenser fan

motor and the compressor. The snowflake LED will go out and the fan LED will remain on.

Any accumulated frost on the evaporator coils melts during the defrost cycle. Freezer products will remain at or

below -20 C (-4 F) during the defrost cycle. The condensate drains to a drain pan mounted along the condensing

unit. The heat from the condensing unit evaporates any condensate in the drain pan.

The temperature control system is preset by the factory to maintain a cabinet temperature of -33 C (-27 F). If

desired, the cut-out temperature can be raised as high as -25 C (-13 F) by following the instructions on page

for changing the temperature set point. The 2 C (4 F) cut-out differential will be maintained regardless of the

controller set point.

The FZR5-PL series undercounter freezers control frost accumulation on the evaporator through automatic timed

defrost cycles. The defrost cycle is initiated by the temperature controller every 6 hours. Contacts 2 and 3 on the

controller open and the refrigeration system is turned off. Contact 7 is closed and the defrost heater is energized.

The melting snowflake LED on the controller will light, and the temperature display will read "dEF" to indicate the

freezer is in the defrost cycle.

The heaters warm the evaporator coil and drain pan to melt the frost and drain the water to the condensate pan.

The temperature controller monitors evaporator temperature using a probe embedded in the coil. The controller

terminates the defrost cycle when the evaporator temperature reaches +5 C (+41 F) or after 25 minutes of defrost

time, whichever occurs first. As the defrost cycle terminates, the controller de-energizes the heater and energizes

the control relay, turning on the compressor and condenser fan. The snowflake LED on the controller will light to

indicate that the refrigeration system is running.

There is a 10 minute delay before the evaporator fan motor is re-energized. The fan LED on the controller will

come on to indicate the fan is running and the temperature display resumes displaying cabinet temperature. A

defrost cycle can be initiated manually at any time by depressing and holding the melting snowflake button for

approximately three seconds. As a safety feature, a temperature safety switch mounted on the evaporator will turn

off the defrost heater if the temperature of the evaporator reaches +27 C (+80 F) regardless of controller operation.

Note: Storage of products of very low volumes or mass may require additional product insulation.

FZR Undercounter Plasma Freezer

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