Payne PH4GNAB24000AA Installation Instructions Manual page 31

T1 - ENABLES DEFROST
TIMER.MUST BE
ENERGIZED FOR
DEFROST TIMER
TO START
C - COMMON
O - REVERSING VALVE
THERMOSTAT INPUTS
Fig. 19 - - Defrost Control
OUTDOOR FAN
RELAY
DEFROST THERMOSTAT
MUST BE CLOSED BEFORE
DEFROST TIMER BEGINS
Y OUTPUT TO PRESSURE
SWITCHES AND CONTACTOR
SPEEDUP
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