Page 3
XC13 SERIES
WARNING
This product and/or the indoor unit it is matched
with may contain fiberglass wool.
Disturbing the insulation during installation, main-
tenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber-
glass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service and repair items.
TORQUE OR TIGHTENING REQUIREMENTS
Use a torque wrench and the Table 1 when tighten various
components. In the absence of a torque wrench, use
figures 1 and 23 for tightening distances.
Table 1. Torque Requirements
Part
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
1
2
3
4
5
6
7
8
9
10
11 12
1/6 TURN
1
2
3
4
5
6
7
8
9
10
11 12
1/12 TURN
Figure 1. Tightening Distances
USING MANIFOLD GAUGE SETS
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
See
Charging Procedures
, step 1 for a typical manifold
gauge connection setup.
Manifold gauge sets 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 on the high side and a low side of
30" vacuum to 250 psi with dampened speed to 500 psi.
Gauge hoses must be rated for use at up to 800 psi of
pressure with a 4000 psi burst rating.
OPERATING SERVICE VALVES
The liquid and suction line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each service valve is equipped with a service port which
has a factory−installed valve stem.
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.
NOTE − A label with specific tightening requirements may
be affixed to the stem cap. If the label is present, use the
specified torque stated.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
To Access Angle−Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
VALVE STEM
FRONT-SEATED
TO OUTDOOR UNIT
SERVICE PORT
CORE
TO INDOOR
UNIT
SERVICE PORT
SERVICE PORT CAP
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS
STEM CAP
Figure 2.
Angle−Type Service Valve
(Font−Seated Closed)
