Page 10
504953M 03/06
Service Valves
The liquid line and vapor line service valves and gauge
ports are used for leak testing, evacuating, charging and
checking charge. Each valve is equipped with a service
port which has a factory−installed Schrader valve. A ser-
vice port cap protects the Schrader valve from contamina-
tion and serves as the primary leak seal.
Front-Seated Service Valve (Liquid Line)
The front-seated service valve is shown in figure 11. When
this valve is closed, the service port is open to the line set.
Access the service port and open and close valves as de-
scribed in the following paragraphs.
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 completed, replace service port cap.
Tighten finger tight; then torque per table 1 (Page 2).
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight; then torque
per table 1 (Page 2).
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight; then torque
per table 1 (Page 2).
Vapor Line Ball Valve
Ball-type service valves (see figure 12) function the same
way as the other valves but cannot be rebuilt; if one fails,
replace with a new valve. The ball valve is equipped with a
service port with a factory−installed Schrader valve. A ser-
vice port cap protects the Schrader valve from contamina-
tion and assures a leak−free seal.
Front-Seated Liquid Line Service Valve
SERVICE
PORT
(Valve Shown Open)
insert hex wrench here
To outdoor coil
STEM
CAP
Service port Is open to
line set when valve is
closed (front seated)
Figure 11
To
indoor coil
To outdoor coil
STEM
CAP
(Valve Shown Closed)
Insert hex wrench here
CAP
To
indoor coil
SERVICE
PORT
CAP
SERVICE PORT
BALL (SHOWN
CLOSED)
STEM
CAP
SCHRADER VALVE
SERVICE
PORT CAP
TO
INDOOR
COIL
TO
OUTDOOR
COIL
STEM
USE ADJUSTABLE WRENCH
TO OPEN: ROTATE STEM
COUNTER-CLOCKWISE 90°.
TO CLOSE: ROTATE STEM
CLOCKWISE 90°.
Ball−Type Vapor Valve (Valve Closed)
Figure 12
