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13HPX SERIES
Typical Unit Parts Arrangement
COMPRESSOR HARNESS
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE VALVE
(ANGLE−TYPE − ALL
OTHER SIZES)
BI−FLOW FILTER
DRIER
DISCHARGE
LINE
HIGH PRESSURE SWITCH (S4)
COMPRESS0R
TRUE SUCTION
PORT
CHECK /
EXPANSION VALVE
DEFROST THERMOSTAT
(S6)
EQUALIZER LINE
MUFFLER
REVERSING
VALVE (L1)
REVERSING VALVE
SOLENOID
LOW PRESSURE
SWITCH (S87)
NOTE PLUMBING LAYOUT AND
COMPRESSOR TYPE MAY VARY
SLIGHTLY BETWEEN MODEL SIZES.
GROUND
LUG
CONTACTOR
(K−1)
CONTROL
CONTROL WIRE
LOOP
CUTOUT FOR
HIGH VOLTAGE
CONDUIT
DEFROST
CONTROL
(CMC1)
DUAL RUN
CAPACITOR
(C12)
SWITCH
COVER
THERMAL
PROTECTION SWITCH
(S173) (
ONLY ON
UNITS USING
EXTERNAL SWITCH)
CRANKCASE HEATER THERMOSTAT
(S40) (−042, −048, −060 UNITS ONLY)
CRANKCASE
CASE HEATER
(HR1) (−060
UNIT ONLY)
VAPOR LINE
SERVICE VALVE
(BALL−TYPE −060
ONLY)
Figure 1. Typical Unit Parts Arrangement
Caps and Fasteners Torque Requirements
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Notes #C−08−1
for further details and information.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
Table 1. Torque Requirements
Parts
Recommended Torque
Service valve cap
8 ft.− lb.
11 NM
Sheet metal screws
16 in.− lb.
2 NM
Machine screws #10
28 in.− lb.
3 NM
Compressor bolts
90 in.− lb.
10 NM
Gauge port seal cap
8 ft.− lb.
11 NM
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