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The demand defrost control measures differential temperatures to detect when the system is performing poorly because of
ice build−up on the outdoor coil. The controller self−calibrates when the defrost system starts and after each system defrost
cycle. The demand defrost control components are shown in figure 22.
TEST PINS
DEFROST TERMINATION PIN
SETTINGS
SENSOR PLUG IN (COIL &
AMBIENT
SENSORS)
DELAY PINS
REVERSING VALVE
PRESSURE
SWITCH
CIRCUIT
CONNECTIONS
506650−01
Demand Defrost Control (A108)
.
Figure 22
Demand Defrost Control (A108)
Page 28
LOW AMBIENT THERMOSTAT
PINS
DIAGNOSTIC LEDS
24V TERMINAL STRIP CONNECTIONS
Note − Component locations vary
by board manufacturer.
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