Lennox XP19-024 Instruction Manual page 20

A−Service Valves
Access the liquid line and vapor line service valves (figures
21 and 22) and gauge ports are used for leak testing, eva-
cuating, charging and checking charge. See table 8 for
torque requirements.
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 8
Part
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
IMPORTANT
Service valves are closed to the outdoor unit and
open to line set connections. Do not open the valves
until refrigerant lines have been leak tested and
evacuated. All precautions should be exercised to
keep the system free from dirt, moisture and air.
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − 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 − Using service wrench and hex head extension, back
the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for liquid line
size.
3 − Replace stem cap and tighten it firmly. Tighten finger
tight, then tighten an additional 1/6 turn.
To Close Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension, turn
stem clockwise to seat valve. Tighten it firmly.
NOTE − Use a 3/16" hex head extension for liquid line
size.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
Vapor Line (Ball Type) 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 valve is illustrated in figure 22.
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
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.
Front-Seated Liquid Line Service Valve
SCHRADER
VALVE
[open to line set
when valve is
closed (front
seated)]
(VALVE front-
seated)
To
indoor coil
To outdoor coil
SERVICE PORT CAP
SERVICE
PORT
To
indoor coil
To outdoor coil
Vapor Line (Ball Type) Service Valve
Use Adjustable Wrench
To close: rotate Stem
Counter-clockwise 90°.
To open: rotate Stem
Clockwise 90°.
SERVICE
PORT
SCHRADER
VALVE
SERVICE
PORT CAP
Page 20
SERVICE PORT CAP
SERVICE PORT
(Valve Shown
Closed)
Insert hex
wrench here
SCHRADER
VALVE
(Valve Shown Open)
insert hex wrench here
STEM
CAP
FIGURE 21
(Valve Open)
To indoor coil
BALL
(Shown
closed)
STEM
STEM
CAP
To outdoor coil
FIGURE 22
STEM
CAP