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Section 5Electrical System

5-2

Refrigerators - Remote - RR1, RR2, RR3

For wiring diagram, see page 5-8

COOLING CYCLE

With the main ON/OFF switch in the ON

position, the current flows, energizing the

evaporator fan motors.

Current also flows through the closed contacts

of the temperature control, energizing the

liquid line solenoid valve. The increase in

suction pressure causes the contacts on the

low pressure switch to close, energizing the

refrigeration system.

OFF CYCLE

When the temperature control senses the

proper temperature, it opens, shutting off the

liquid line solenoid valve. The drop in suction

pressure causes the low pressure switch to

open, de-energizing the refrigeration system.

The refrigeration system remains off until the

temperature control senses approximately

38°F (3.3°C). (This also keeps the evaporator

defrosted.) At that time, the temperature

control closes and starts the refrigeration

system.

Freezers - Self-Contained - F1, F2, F3

For wiring diagram, see pages 5-9, 5-10, 5-11

COOLING CYCLE

With the main ON/OFF switch in the ON

position, the current flows, energizing the

automatic defrost time clock.

Current also flows through the closed contacts

of the temperature control, energizing the

condenser fan motor(s) and the compressor.

With contact N closed on the automatic

defrost time clock, current will flow through

the normally open (N.O.) light/fan switch

contacts (with the door closed).

When the evaporator coil temperature reaches

30 to 35°F (-1.1 to 1.7°C), the defrost end and

fan delay thermostat closes, energizing the

evaporator fans.

DEFROST CYCLE

At preset times on the automatic defrost time

clock, the contacts switch to defrost the

evaporator. Contact N opens, de-energizing

the evaporator fan motor(s). Contact #4

opens, de-energizing the refrigeration system.

Contact #1 closes, energizing the evaporator

defrost heater.

As the evaporator temperature rises, the

defrost end and fan delay thermostat opens to

terminate the defrost cycle. Contact #1 opens,

de-energizing the defrost heater. Contacts N

and #4 close, energizing the refrigeration

system.

OFF CYCLE

When the temperature control senses the

proper temperature, it opens, shutting off the

refrigeration system.

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