Page 4
FIGURE 6
HP27 UNIT COMPONENTS
CONTACTOR
DEFROST CONTROL/TIMED−OFF CONTROL
LIQUID LINE
SERVICE VALVE
AND GAUGE
PORT
VAPOR LINE
SERVICE VALVE
AND GAUGE
PORT
MUFFLER
EXPANSION VALVE
WITH
INTERNAL CHECK
VALVE
REVERSING
VALVE
AND SOLENOID
BIFLOW FILTER/DRIER
DUAL CAPACITOR
DISTRIBUTOR
HIGH PRESSURE
SWITCH
GROUND LUG
TERMINAL STRIP
DEFROST
THERMOSTAT
TXV
SENSING BULB −036,
−042 ONLY
SUCTION
GAUGE
PORT
THERMOMETER WELL
ACCUMULATOR
TXV
SENSING BULB
−024, −030 ONLY
D−High Pressure Switch
An automatic reset high pressure switch (S4) located in the
liquid line of the compressor shuts off the compressor when
liquid line pressure rises above the factory setting. The switch
is normally closed and is permanently adjusted to trip (open)
at 410 + 10 psi. The switch closes at 210 + 10 psi. See figure 6
for switch location.
E−Contactor
The compressor is energized by a contactor (K1) located
in the control box. Units will use single−pole or double−pole
contactors. See wiring diagrams for specific unit. The con-
tactor is energized by indoor thermostat terminal Y when
thermostat demand is present.
DANGER
Electric Shock Hazard.
May cause injury or death.
Disconnect all remote electrical power
supplies berore opening unit panel. Unit
may have multiple power supplies.
Some units are equipped with single−
pole contactors. When unit is equipped
with a single−pole contactor, line voltage
is present at all components (even when
unit is not in operation).
F−Condenser Fan Motor
See page 1 for specifications for all condenser fan motors
(B4) used. See figure 7 if condenser fan motor replace-
ment is necessary. In all units, the condenser fan motor is
controlled by the compressor contactor and is de−ener-
gized when the defrost relay is energized.
FIGURE 7
"A" SEE TABLE 2
FAN
GUARD
Condenser fan
and motor
Wiring
Drip loop
TABLE 2
UNIT
"A" DIM.
TOLERANCE
HP27−024, −030
1 1/16"
+ 1/8"
HP27−036, −042
1 3/16"
+ 1/8"
G−Accumulator
The accumulator is located on the liquid line (see figure 6.)
The accumulator retains liquid and releases mostly vapor
to the compressor. This ensures that the liquid refrigerant
will not enter and damage the compressor.
