Typical Unit Parts Arrangement; Operating Gauge Set And Service Valves - Lennox 13ACX Installation And Service Procedure

Typical Unit Parts Arrangement

CONTROL
GROUND LUG
CONTACTOR
CUTOUT FOR HIGH
VOLTAGE CONDUIT

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.
NOTE — PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY
BETWEEN MODEL SIZES.
COMPRESS0R
CAPACITOR
DISCHARGE LINE
COMPRESSOR
HARNESS
OUTDOOR COIL
CONTROL WIRE
LOOP
HIGH PRESSURE
SWITCH (S4)
LIQUID LINE SERVICE VALVE
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.
Parts
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
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
Page 9
SUCTION LINE SERVICE
VALVE (BALL OR ANGLE-
TYPE)
IMPORTANT
Table 1. Torque Requirements
Recommended Torque
8 ft.- lb.
16 in.- lb.
28 in.- lb.
90 in.- lb.
8 ft.- lb.
11 NM
2 NM
3 NM
10 NM
11 NM
13ACX
SERIES