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XP21 SERIES
Typical Unit Parts Arrangement
GROUND LUGS
HIGH VOLTAGE FIELD
CONNECTIONS
CONTACTOR 1 POLE (K1−1)
HEAT PUMP CONTROL
(A175)
CAPACITOR (C12)
FAN MOTOR CONTROL (A177)
WIRE TIE
OUTDOOR AMBIENT
TEMPERATURE
SENSOR (RT13)
VAPOR VALVE
AND GAUGE
PORT
REVERSING
VALVE
LIQUID LINE BI−FLOW
FILTER DRIER
HIGH PRESSURE
SWITCH (S4)
LIQUID VALVE AND
GAUGE PORT
TRUE SUCTION LINE
PORT
LOW PRESSURE
SWITCH (S87)
CRANKCASE HEATER THERMOSTAT (S40)
CRANKCASE HEATER (HR1)
(BELLY BAND)
COMPRESSOR
MUFFLER
DISCHARGE LINE
CHECK
EXPANSION VALVE
DISCHARGE LINE
TEMPERATURE SENSOR
(RT28)
COIL TEMPERATURE SENSOR (RT21)
ON RETURN BEND, 12 TUBES UP FROM
BOTTOM (11.50’ UP)
XP21−024 AND −036
XP21−048 AND −060
COIL TEMPERATURE
SENSOR (RT21) ON
RETURN BEND, 24
TUBES UP FROM
BOTTOM (23.50’ UP)
DISTRIBUTOR
Figure 1. Plumbing, Switches and Sensor Components
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