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B−Dual Capacitor (C12)
The compressor and fan in HPXA16 units use permanent
split capacitor motors. A single dual" capacitor is used for
both the fan motor and the compressor (see unit wiring dia-
gram). The two sides (fan and compressor) of the capacitor
have different mfd ratings and may change with each com-
pressor. The capacitor is located inside the unit control box.
C−Condenser Fan Motor (B4)
HPXA16 units use single−phase PSC fan motors which re-
quire a run capacitor. The FAN" side of the dual capacitor
is used for this purpose. In all units, the outdoor fan is con-
trolled by the compressor contactor. See ELECTRICAL
DATA and SPECIFICATIONS section for more information.
See figure 8 if condenser fan motor replacement is neces-
sary. Rain shield location is critical on the condenser fan
assembly. Two shields are used in unison to prevent mois-
ture from entering the motor bearings. Installing the shields
to close to the bearing hub will create noise and may affect
operation. Installing too far away will allow moisture to en-
ter the bearing, resulting in motor failure. See figure 9.
"A" SEE TABLE 2
Condenser fan
and motor
FIGURE 8
RUN CAPACITOR
START CAPACITOR
(−024 UNIT ONLY)
DEFROST CONTROL
CHARGE COMPENSATOR
(−048 UNITS ONLY)
TXV/CHECK VALVE
DISCHARGE LINE
DISCHARGE LINE SENSOR
HIGH PRESSURE SWITCH
RAIN SHIELD LOCATION
plastic
fiber
shield
D−Transformer (T46)
Transformer T46 is located in the control box and is ener-
gized any time the compressor is operating.
E−Contactor (K1)
The compressor is energized by a contactor located in the
FAN
GUARD
control box. All HPXA16 units are single phase and use single−
pole contactors.
F−Low Pressure Switch (S87)
The HPXA16 is equipped with an auto−reset low pressure
switch which is located on the suction line. The switch shuts
off the compressor when the suction pressure falls below
Wiring
Drip loop
the factory setting. The switch closes when it is exposed to
55 psig and opens at 25 psig. It is not adjustable.
HPXA16 PARTS ARRANGEMENT
FIGURE
10
Page 7
TABLE 2
HPXA16 UNIT
−024, −036
−048
−060
shield
FIGURE 9
OUTDOOR FAN MOTOR
CONTACTOR
VAPOR LINE
LOW PRESSURE SWITCH
TWO STAGE COMPRESSOR
"A" DIM. + 1/8"
1 1/16"
1 3/16"
1 3/16"
Critical Dimension
1/4" (.250)
VAPOR VALVE AND
GAUGE PORT
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