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STATES
LOAD
REMARK
COMP
ON
ON
OFF
OFF
F DEFROSTING HEATER
OFF
ON
ON
OFF
COMP OPERATION
COMP OFF, F-DEFROSTING HEATER OFF
F-DEFROSTING HEATER ON
COMP OFF, F-DEFROSTING HEATER OFF
preverting power of F-DEFROSTING HEATER
PREVENTING COMP POWER
As it is seen above block diagram. 220V line is connected to the commons of comp relay, Ry 71 and defrosting heater relay,
Ry 73, Ry 75. When those relays are off state comp and defrosting heater are also off. As comp relay moves to on and AC
220V applied to comp load it starts operating On the other hand defrost heater runs if defrost heater relay moves to on. There
is no chance that both comp and defrost heater runs together so it’s useful for safety aspect.
7. COMP AND DEFROSTING HEATER OPERATING
RED
GRY
COMP LED
F-DEFROSTING HEATER
R-DEFROSTING HEATER