FIGURE 9
SNAP
BUTTONS
SLIT FOR DISCHARGE LINE
SLIT FOR
SUCTION
LINE
COVER
COMPRESSOR
Page 10
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 for
installation around the
discharge and suction lines.
2 − Crankcase Heater
A crankcase heater is used on all HP29 units equipped with
a
reciprocating compresso
r. The well−mounted
insertion−type heater is self−regulating. See table 8 for
crankcase heater specifications.
Unit
HP29−211/-261/-311/-410
HP29 CRANKCASE HEATER RATINGS
Rating (Watts)
40 watts
27 watts
HP29-460,-510and-650
40 watts
27 watts
HP29−018/−024/−030
HP29−042
TABLE 8
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.
FIGURE 10
FAN
CONDENSER FAN MOTOR
AND COMPRESSOR ACCESS
Remove (7) screws
REMOVE (7) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/FAN ASSEMBLY.
FAN GUARD
WIRING DRIP
LOOP
Remove (4) nuts
ALIGN FAN HUB
FLUSH WITH
MOTOR SHAFT
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
COIL
DEFROST THERMOSTAT
EXPANSION/
CHECK
VALVE
BI-FLOW
FILTER / DRIER
TO
HCFC22
DRUM
LOW
PRESSURE
HIGH
PRESSURE
COMPRESSOR
REVERSING VALVE
VAPOR
LINE
VALVE
MUFFLER
NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW
SERVICE
PORT
SUCTION
EXPANSION/CHECK
VALVE
INDOOR UNIT
OUTDOOR UNIT
LIQUID LINE
SERVICE PORT
THERMOMETER
WELL
DISTRIBUTOR
INDOOR
COIL
HEATING MODE
FIGURE 11
