Table of Contents
Advertisement
WARNING
This product and/or the indoor unit it is matched
with may contain fiberglass wool.
Disturbing
the
insulation
maintenance, or repair will expose you to fiberglass
wool dust. Breathing this may cause lung cancer.
(Fiberglass 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.
Table 1. Torque Requirements
Part
Service valve cap
8 ft.− lb.
Sheet metal screws
16 in.− lb.
Machine screws #10
28 in.− lb.
Compressor bolts
90 in.− lb.
Gauge port seal cap
8 ft.− lb.
USING MANIFOLD GAUGE SETS
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
See figure 3 for a typical manifold gauge connection setup.
OPERATING SERVICE VALVES
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.
during
installation,
Recommended Torque
11 NM
2 NM
3 NM
10 NM
11 NM
The liquid and suction line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a
factory−installed valve stem.
11 12
10
9
8
7
6
Figure 1. Cap Tightening Distances
NOTE − A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque listed.
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
Operating Angle−Type Service Valve
To Access Angle−Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
SERVICE PORT CAP
SERVICE PORT
CORE
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS
VALVE STEM
FRONT-SEATED
TO INDOOR
UNIT
TO OUTDOOR UNIT
Figure 2. Angle−Type Service Valve
(Font−Seated Closed)
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
S
With Torque Wrench: Tighten finger tight and then
tighten per table 1.
Page 3
1/6 TURN
11 12
1
2
10
3
9
4
8
5
7
6
IMPORTANT
SERVICE PORT
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
STEM CAP
1/12 TURN
1
2
3
4
5
AC13 SERIES
Hide quick links:
Advertisement
Table of Contents
