3DJH
Liquid Line Service Valve ( Figure 8)
The valve is equipped with a service port. There is no
schrader valve installed in the liquid line service port. A
service port cap is supplied to seal off the port.
The liquid line service valve is a front and back seating
valve. When the valve is backseated the service port is
not pressurized. The service port cap can be removed
and gauge connections can be made.
To Access Service Port:
1-- Remove the stem cap. Use a service wrench to
make sure the service valve is backseated.
FIGURE 8
KNIFE EDGE SEAL
STEM CAP
VALVE
BACKSEATED
INLET
(FROM OUTDOOR COIL)
OUTLET
(TO INDOOR COIL)
SERVICE PORT
CLOSED TO LINE SET
AND UNIT
(NO PRESSURE)
SERVICE PORT CAP
TO OUTDOOR UNIT
(COIL)
TO LINE SET
STEM CAP
KNIFE EDGE
SEAL
VALVE FRONT
SEATED
TO LINE SET
SERVICE PORT OPEN
TO LINE SET
AND CLOSED
TO UNIT
TO OUTDOOR
UNIT (COIL)
LIQUID LINE SERVICE VALVE
IMPORTANT
A schrader valve is not provided on the liquid line service port.
Valve must be backseated to turn off pressure to service port.
VALVE STEM
USE SERVICE
WRENCH
VALVE STEM
USE SERVICE WRENCH
CAUTION
The service port cap is used to seal the liquid
line service valve. A schrader valve is not
provided. Access to service port requires
backseating the service valve to isolate the
service port from the system. Failure to do so
will cause refrigerant leakage.
2-- Remove service port cap and connect high pres-
sure gauge to service port.
3-- Using service wrench, open valve stem (one turn
clockwise) from backseated position.
4-- When finished using port, backseat stem with ser-
vice wrench. Tighten firmly.
5-- Replace service port and stem cap. Tighten finger
tight, then tighten an additional 1/6 turn.
To Close Off Service Port:
1-- Using service wrench, backseat valve by turning
stem counterclockwise. Tighten firmly.
To Open Liquid Line Service Valve:
1-- Remove the stem cap with an adjustable wrench.
2-- Using service wrench, backseat valve by turning
stem counterclockwise until backseated. Tighten
firmly.
3-- Replace stem cap, finger tighten then tighten an
additional 1/6 turn.
To Close Liquid Line Service Valve:
1-- Remove the stem cap with an adjustable wrench.
2-- Turn the stem in clockwise with a service wrench to
front seat the valve. Tighten firmly.
3-- Replace stem cap, finger tighten then tighten an
additional 1/6 turn.
Vapor Line Service Valve ( Figure 9)
The valve is equipped with a service port. A schrader
valve is factory installed. A service port cap is supplied
to protect the schrader valve from contamination and
assure a leak free seal.
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 an additional 1/6 turn.
To Open Vapor Line Service Valve:
1-- Remove stem cap with an adjustable wrench.
2-- Using service wrench and 5/16 hex head exten-
sion back the stem out counterclockwise until the
valve stem just touches the retaining ring.
