Refrigerant System - Lennox HP29 Series Unit Information

1 − Compressor Cover (Figure 9)
A compressor cover
constructed of vinyl-faced
fiberglass is used on all
HP29 units. The cover
provides an acoustic barrier.
The cover slides over the
compressor and is held
secure with snap buttons.
Slits are provided
installation around the
discharge and suction lines.
2 − Crankcase Heater
A crankcase heater is used on all HP29 units equipped with
a reciprocating compressor.
insertion−type heater is self−regulating. See table 8 for
crankcase heater specifications.
TABLE 8
HP29 CRANKCASE HEATER RATINGS
Unit
HP29−211/-261/-311/-410
HP29-460,-510 and -650
HP29−018/−024/−030
HP29−042
C − Condenser Fan Motor
All units use single−phase PSC fan motors which require a run
capacitor. In all HP29 units, (except "G" and "J" voltage) the
outdoor fan is controlled by the CMCI defrost board.
ELECTRICAL DATA tables in this manual show
specifications for outdoor fans used in HP29s.
Access to the outdoor fan motor on all units is gained by
removing the seven screws securing the fan assembly.
See figure 10. The outdoor fan motor is removed from
the fan guard by removing the four nuts found on the top
panel. If condenser fan motor must be replaced, align
fan hub flush with motor shaft.
DEFROST THERMOSTAT
EXPANSION/
LOW
PRESSURE
HCFC22
DRUM
LIQUID LINE
SERVICE PORT
COVER
for
COMPRESSOR
SLIT FOR DISCHARGE LINE
FIGURE 9
The well−mounted
Rating (Watts)
40 watts
27 watts
40 watts
27 watts
CHECK
BI-FLOW
VALVE
FILTER / DRIER
HIGH
PRESSURE
MUFFLER
TO
COMPRESSOR
THERMOMETER
WELL
NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW
SLIT FOR
SUCTION
LINE
Remove (7) screws
SNAP
BUTTONS
Remove (4) nuts
D − Reversing Valve L1 and Solenoid
A refrigerant reversing valve with electromechanical
solenoid is used to reverse refrigerant flow during unit
operation. The reversing valve requires no maintenance.
It is not repairable. If the reversing valve has failed, it must
be replaced.
If replacement is necessary, access reversing valve by
removing the outdoor fan motor. Refer to figure 10.
III − REFRIGERANT SYSTEM
Refer to figure 11 for refrigerant flow in the cooling modes.
The reversing valve is energized during cooling demand
and during defrost.
A − Liquid and Vapor Line Service Valves
The liquid and vapor line service valves (figures 12 and 13)
and gauge ports are accessible from outside the unit.
Each valve is equipped with a service port. The service ports
are used for leak testing, evacuating, charging and checking
charge. A schrader valve is factory installed. A service port cap
is supplied to protect the schrader valve from contamination
and serve as the primary leak seal.
NOTE-Always keep valve stem caps clean.
OUTDOOR UNIT
DISTRIBUTOR
OUTDOOR
REVERSING VALVE
COIL
SUCTION
SERVICE
PORT
EXPANSION/CHECK
FIGURE 11
Page 10
CONDENSER FAN MOTOR
AND COMPRESSOR ACCESS
FAN
ALIGN FAN HUB
FLUSH WITH
MOTOR SHAFT
REMOVE (7) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/FAN ASSEMBLY.
FIGURE 10
HEATING MODE
INDOOR UNIT
VAPOR
LINE
VALVE
INDOOR
COIL
VALVE
FAN GUARD
WIRING DRIP
LOOP