Service Valves - Lennox HSXA12-018 Installation Instructions Manual

Service Valves

The liquid line and vapor line service valves (figures 11 and
12) and gauge ports are used for leak testing, evacuating,
charging and checking charge. See table 3 for torque re-
quirements.
Each valve is equipped with a service port which has a fac-
tory−installed Schrader valve. A service port cap protects
the Schrader valve from contamination and serves as the
primary leak seal.
Table 3
Torque Requirements
Part
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is completed, replace service port cap.
Tighten finger tight, then tighten an additional 1/6 turn.
To Open Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to
back the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for liquid line
sizes or a 5/16" extension for vapor line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 turn.
To Close Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to
turn the stem clockwise to seat the valve. Tighten it
firmly.
NOTE − Use a 3/16" hex head extension for liquid line
sizes or a 5/16" extension for vapor line sizes.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 turn.
Recommended Torque
8 ft.− lb. 11 NM
16 in.− lb. 2 NM
28 in.− lb. 3 NM
90 in.− lb. 10 NM
8 ft.− lb. 11 NM
service
port
to outdoor coil
service
port cap
Schrader valve open
to line set when valve is
closed (front seated)
insert hex
wrench here
service
port
to outdoor coil
service port
cap
Schrader
valve
Vapor Line (Ball Type) Service Valve
Vapor line service valves function the same way as the oth-
er valves; the difference is in the construction. These
valves are not rebuildable. If a valve has failed, you must
replace it. A ball valve is illustrated in figure 12.
The ball valve is equipped with a service port with a factory−
installed Schrader valve. A service port cap protects the
Schrader valve from contamination and assures a leak−
free seal.
Page 12
Service Valve
(Valve Closed)
insert hex
wrench here
to indoor coil
(valve front seated)
Service Valve
(Valve Open)
to indoor coil
Figure 11
stem cap
stem cap