Lennox 13HPX Series Unit Information page 7

SUCTION
1
SUCTION
POCKET
SUCTION
3
CONDENSER FAN MOTOR
AND COMPRESSOR ACCESS
Remove (7) screws
FAN
Remove (4) nuts
REMOVE (7) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/
FAN ASSEMBLY.
FIGURE 9
DANGER
Make sure all power is disconnected before
beginning electrical service procedures.
C − Outdoor Fan Motor
All units use single−phase PSC fan motors which require a run
capacitor. In all units, the condenser fan is controlled by
the compressor contactor (and defrost control during
defrost cycles).
ELECTRICAL DATA tables in this manual show specifi-
cations for condenser fans used in 13HPXs.
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
HIGH PRESSURE GAS
FIGURE 8
FAN GUARD
WIRING
ALIGN FAN HUB
FLUSH WITH
MOTOR SHAFT.
ON −060 UNITS
SHAFT SHOULD
BE 1/4" FROM
HUB.
Page 7
2
SUCTION
4
Access to the condenser fan motor on all units is gained
by removing the seven screws securing the fan assem-
bly. See figure 9. The outdoor fan motor is removed from
the fan guard by removing the four nuts found on the top
panel. If replacing outdoor fan motor on the 13HPX−060,
align motor shaft 1/4" from the hub. For all other 13HPX
model units, motor shaft should be flush with hub. See
figure 9. Drip loops should be used in wiring when ser-
vicing motor.
D − Reversing Valve L1 and Solenoid
A refrigerant reversing valve with electromechanical so-
lenoid is used to reverse refrigerant flow during unit op-
eration. The reversing valve requires no maintenance.
The only replaceable part is the solenoid. If the reversing
valve itself has failed, it must be replaced.
If replacement is necessary, access reversing valve by re-
moving the outdoor fan motor. Refer to figure 9.
E − High Pressure Switch S4
IMPORTANT
Pressure switch settings for R−410A refrigerant
will be significantly higher than units with R−410A.
An auto-reset, single-pole/single-throw high pressure switch
is located in the liquid line. This switch shuts off the compres-
sor when liquid line pressure rises above the factory setting.
The switch is normally closed and is permanently adjusted to
trip (open) at 590 + 15 psi.
F − Low Pressure Switch S87
An auto-reset, single-pole/single-throw low pressure
switch is located in the suction line. This switch shuts off the
compressor when suction pressure drops below the facto-
ry setting. The switch is closed during normal operating
pressure conditions and is permanently adjusted to trip
INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
DISCHARGE
POCKET