Follett FZR5-PL Series Manuale di installazione, funzionamento e assistenza - Pagina 8

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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 4 and 5 close and energize the evaporator

and condenser fan motors, compressor and door heater. The LED's under the snowfl ake and fan on the controller

will come on to indicate 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 5 reopens, which de-energizes the condenser fan motor and the compressor.

The LED under the snowfl ake icon will go out, the LED under the fan icon will remain on.

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

below -25 C (-13 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 6

for changing the temperature set point. The 2 C cut-out differential will be maintained regardless of the controller

set point.

Defrosting

The FZR5-PL undercounter freezer controls frost accumulation on the evaporator through automatic timed defrost

cycles. The defrost cycle is initiated by the temperature controller every 6 hours. Contacts 4 and 5 on the controller

open and the refrigeration system is turned off. Contact 2 is closed and the defrost heater is energized. The LED

under the melting snowfl ake icon on the controller will come on, and the temperature display will read: "DEF" to

indicate the freezer is in the defrost cycle.

The heater warms 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 4 C (39 F) or after 25 minutes of defrost

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

the compressor and condenser fan. The LED under the snowfl ake on the controller will come on to indicate the

refrigeration system is running.

There is a 10 minute delay before the evaporator fan motor is re-energized. The LED under the fan 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 snowfl ake

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.

Cleaning

Use only non-chlorine-based cleaners. Cleaners containing chlorine can cause staining and pitting of the

stainless steel.

Interior – Using a sponge or soft cloth, clean unit with a non-abrasive, non-chlorinated, all-purpose detergent.

Exterior – Wipe exterior with a soft cloth in the direction of grain as needed. Stainless steel polish may be used to

enhance the fi nish of the unit.