Typical Unit Parts Arrangement - Lennox Signature XP21 Series Installation And Service Procedure

Typical Unit Parts Arrangement

WIRE TIE
RT13 OUTDOOR
AMBIENT
TEMPERATURE
SENSOR
DISCHARGE LINE
DISCHARGE LINE
TEMPERATURE SENSOR
(RT28)
MUFFLER
REVERSING
VALVE
VAPOR VALVE
AND GAUGE
PORT
LIQUID VALVE AND
GAUGE PORT
TRUE SUCTION LINE
PORT
LIQUID LINE BI−FLOW
FILTER DRIER
CONTACTOR−1POLE
HIGH VOLTAGE FIELD
CHECK
EXPANSION VALVE
COMPRESSOR
HIGH PRESSURE
SWITCH (S4)
LOW PRESSURE
SWITCH (S87)
Figure 1. Plumbing, Switches and Sensor Components
FAN MOTOR CONTROL (A177)
MODULATION (PWM) (ONLY ON UNITS WITH MAIN
GROUND LUGS
(K1−1)
CONNECTIONS
HEAT PUMP CONTROL (A175)
FAN MOTOR SURGE PROTECTION (ONLY
ON XP21−XXX−230−01 BUILD. STARTING
WITH BUILD −02, SURGE PROTECTION
BUILT INTO FAN MOTOR)
COIL TEMPERATURE SENSOR (RT21) − ON
RETURN BEND, 12 TUBES UP FROM
HR1 CRANKCASE HEATER
CRANKCASE HEATER THERMOSTAT (S40)
Page 5
PULSE−WIDTH
CONTROL 101796−XX)
CAPACITOR (C12)
XP21−024 AND −036
BOTTOM (11.50' UP)
XP21−048 AND −060
COIL TEMPERATURE
SENSOR (RT21) − ON
RETURN BEND, 24
TUBES UP FROM
BOTTOM (23.50' UP)
XP21