Follett FZR5-PL Series Handbuch für Installation, Betrieb und Wartung - Seite 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 snowflake and fan LED's 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

snowflake LED will go out, 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 6

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

set point.

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 melting

snowflake LED 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 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 restarts the compressor and

condenser fan. The snowflake LED 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 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.

Operation

FZR PL Series 00939132R00