Typical Parts Arrangement; Caps And Fasteners Torque Requirements; Operating Gauge Set And Service Valves - Lennox Merit 13HPX Series Installation Instructions Manual

Typical Unit Parts Arrangement
DUAL RUN
CAPACITOR
(C12)
CONTACTOR
(K−1)
GROUND
LUG
DEFROST
CONTROL
(CMC1)
CUTOUT FOR
HIGH VOLTAGE
CONDUIT

Caps and Fasteners Torque Requirements

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.
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CONTROL
PROTECTION SWITCH
CONTROL WIRE
LOOP
NOTE
COMPRESSOR TYPE MAY VARY
SLIGHTLY BETWEEN MODEL SIZES.
Figure 1. Typical Unit Parts Arrangement
IMPORTANT
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THERMAL
(S173) (ONLY ON
UNITS USING
EXTERNAL SWITCH)
SWITCH
COVER
COMPRESSOR HARNESS
DEFROST THERMOSTAT
(S6)
CHECK /
EXPANSION VALVE
EQUALIZER LINE
BI−FLOW FILTER
DRIER
TRUE SUCTION
PORT
PLUMBING LAYOUT AND
CRANKCASE HEATER THERMOSTAT
(S40) (−042, −048, −060 UNITS ONLY)
HIGH PRESSURE SWITCH (S4)
LIQUID LINE SERVICE
VALVE
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
Parts
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
Page 3
REVERSING VALVE
SOLENOID
VAPOR LINE
SERVICE VALVE
(ANGLE−TYPE − ALL
OTHER SIZES)
VAPOR LINE
SERVICE VALVE
(BALL−TYPE −060
ONLY)
Table 1. Torque Requirements
Recommended Torque
8 ft.− lb.
16 in.− lb.
28 in.− lb.
90 in.− lb.
8 ft.− lb.
COMPRESS0R
DISCHARGE
LINE
MUFFLER
LOW PRESSURE
SWITCH (S87)
REVERSING
VALVE (L1)
CRANKCASE
CASE HEATER
(HR1) (−060
UNIT ONLY)
11 NM
2 NM
3 NM
10 NM
11 NM
13HPX SERIES