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13ACX SERIES
Typical Unit Parts Arrangement
COMPRESSOR
HARNESS
LIQUID LINE SERVICE VALVE
SUCTION LINE SERVICE
VALVE (BALL OR ANGLE-
TYPE)
OUTDOOR COIL
DISCHARGE LINE
HIGH PRESSURE
SWITCH (S4)
COMPRESS0R
GROUND LUG
CONTACTOR
CONTROL
CAPACITOR
CONTROL WIRE
LOOP
CUTOUT FOR HIGH
VOLTAGE CONDUIT
NOTE — PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY
BETWEEN MODEL SIZES.
Operating Gauge Set and Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
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.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
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
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 psig on the high side and a low
side of 30” vacuum to 250 psig with dampened speed to
