Defrosting is initiated by the time clock and terminated
by a temperature thermostat set to close at 76°F. When
this thermostat closes, it energizes a solenoid in the
time clock which in turn trips the clock mechanism off
defrost. Should this thermostat fail to close, the defrost
cycle will be terminated by the failsafe pin on the time
clock (set at 40 minutes).
As an additional safety feature, the temperature limiting
thermostat is wired in series with the defrost heater.
This thermostat will also open the heater circuit when
the top coil reaches 76°F. should any malfunction of the
defrost thermostat occur.
Any time the system has been opened and
exposed to the atmosphere, a new drier
should be installed, system completely evacuated, and
recharged to the specified refrigerant and amount list-
ed on the serial plate located inside the unit compart-
ment on the left wall.
DO NOT ATTEMPT CHARGING BY
PRESSURES ALONE!! Charge is
very critical! Charging should be accomplished by
means of weighing, or the use of a charging cylinder.
NOTE:
IMPORTANT:
8 INTRODUCTION
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