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B - Service Valves
The liquid line and suction line service valves and gauge
ports are accessible from outside of the unit. Full service
liquid and suction line valves are used. See figures 10 and
11. The service ports are used for leak testing, evacuating,
charging and checking charge.
1 - Liquid Line Service Valve
A full service liquid line valve is used on all HS24 series
units. Different manufacturers of valves may be used. All
liquid line service valves function the same way, differĆ
ences are in construction. Valves manufactured by Parker
are forged assemblies. Valves manufactured by Primore
are brazed together. Valves are not rebuildable. Defective
valves must be replaced. The liquid line service valve is ilĆ
lustrated in figure 10.
LIQUID LINE SERVICE VALVE
FIGURE 10
STEM CAP
STEM CAP
STEM
CAP
VALVE BACK
SEATED
VALVE
FRONT
SEATED
SERVICE PORT
NOTE: WHEN VALVE IS BACKSEATED SERVICE PORT
IS ISOLATED (BLOCKED OFF) FROM SYSTEM
NOTE: WHEN VALVE IS FRONT SEATED
SERVICE PORT IS NOT ISOLATED
(BLOCKED OFF) FROM SYSTEM
IMPORTANT
A schrader valve is not provided on the liquid line
service port. Valve must be backseated to turn off
pressure to service port.
NO SCHRADER
The valve is equipped with a service port. There is no
schrader valve installed in the liquid line service port. A serĆ
vice 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 isoĆ
lated from the system.
CAUTION
The service port cap is used to seal the liquid line
service valve. Access to service port requires backĆ
seating the service valve to isolate the service port
from the system. Failure to do so will cause refrigerĆ
ant leakage.
IMPORTANT
A schrader valve is not provided on the liquid line
service port. Valve must be backseated to turn off
pressure to service port.
To Access Service Port:
1 - Remove the stem cap with an adjustable wrench.
2 - Remove service port cap with an adjustable wrench.
3 - Connect high pressure gauge to liquid line service port.
4 - Open valve stem (1/2 turn clockwise) from backseated
position.
5 - When finished using port, backseat stem, tighten firmly,
remove gauge; install service port cap, tighten firmly.
Replace stem cap, tighten firmly. See table 6 for serĆ
vice port cap and stem cap torque specifications.
To Close Off Service Port:
1 - Backseat valve with service wrench.
a - Turn stem counterclockwise.
b - Tighten firmly.
To Open Liquid Line Service Valve:
1 - Remove the stem cap with an adjustable wrench.
2 - Backseat valve with service wrench.
a - Turn stem counterclockwise until backseated.
b - Tighten firmly.
3 - Replace stem cap, tighten firmly. See table 6 for stem
cap torque specifications.
To Close Liquid Line Service Valve:
1 - Remove the stem cap with an adjustable wrench.
2 - Turn the stem in clockwise to seat the valve. See table 6
for valve seating torque specifications.
3 - Replace stem cap. See table 6 for stem cap torque
specifications.
