Page 14
Service Valves
The liquid line and vapor line service valves (figure 13) and
and gauge ports are used for leak testing, evacuating,
charging and checking charge. See table 2 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 2
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
To Access Schrader Port:
1 − Remove access panel.
2 − Remove service port cap with an adjustable wrench.
3 − Connect gauge to the service port.
4 − When testing is complete, replace service port cap.
Tighten finger tight, then 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 pos-
sible.
NOTE − Use a 3/16" hex head extension for liquid 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.
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 turn.
Ball−Type Vapor Valve – All Units
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 14.
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.
Liquid Line Service Valve
(Valve Closed)
(valve front seated)
to
indoor coil
to outdoor coil
service
port cap
insert hex
wrench here
stem cap
service port
Liquid Line Service Valve
(Valve Open)
valve
core
service port
service
port cap
insert hex
wrench here
to
indoor coil
to outdoor coil
stem
cap
Service Port Is Open
To Line Set When Valve Is
Closed (Front Seated)
Figure 13
Ball−Type Vapor Valve (Valve Open)
Schrader valve
service port
service port
cap
stem cap
stem
Use Adjustable Wrench
To open: rotate Stem Counter-clockwise 90°.
To close: rotate Stem Clockwise 90°.
ball
(shown open)
to outdoor coil
to indoor coil
Figure 14
