Carrier PHD4 F Series Installation Instructions Manual page 32

T1 - ENABLES DEFROST
TIMER.MUST BE
ENERGIZED FOR
DEFROST TIMER
TO START
C - COMMON
O - REVERSING VALVE
32
OUTDOOR FAN
DEFROST THERMOSTAT
MUST BE CLOSED BEFORE
DEFROST TIMER BEGINS
Y OUTPUT TO PRESSURE
SWITCHES AND CONTACTOR
THERMOSTAT INPUTS
Fig. 21 - - Defrost Control
Specifications are subject to change without notice.
RELAY
SPEEDUP
A150622
51801200404