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Page 5
XPG20 SERIES
USING MANIFOLD GAUGE SET
When checking the system charge, use only a manifold
gauge set that features low−loss and anti−blow back
fittings.
(VALVE STEM
SHOWN CLOSED)
INSERT HEX
WRENCH HERE
VALVE STEM
FRONT-SEATED
TO OUTDOOR
UNIT
SERVICE PORT
CORE
TO INDOOR
UNIT
SERVICE PORT
SERVICE PORT
CAP
CLOSED TO BOTH
INDOOR AND OUTDOOR
UNITS
STEM CAP
ANGLE−TYPE SERVICE VALVE
(FRONT−SEATED CLOSED)
SERVICE PORT
SERVICE PORT
CORE
TO OUTDOOR
UNIT
STEM CAP
(VALVE STEM
SHOWN OPEN)
INSERT HEX
WRENCH HERE
SERVICE PORT
CAP
TO INDOOR
UNIT
OPEN TO BOTH
INDOOR AND
OUTDOOR
UNITS
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
BALL (SHOWN
CLOSED)
SERVICE PORT
CORE
TO INDOOR UNIT
TO OUTDOOR UNIT
TO
OPEN
ROTATE STEM
COUNTERCLOCKWISE 90°.
TO
CLOSE
ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT CAP
STEM CAP
VALVE
STEM
OPEN TO LINE SET WHEN
VALVE IS CLOSED, TO BOTH
LINE SET AND UNIT WHEN
VALVE IS OPEN.
BALL−TYPE SERVICE
VALVE
Figure 1.
Various Types of Service Valves
Manifold gauge set used with HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 − 800 psig on the high side, and a low
side of 30" vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a
factory−installed valve stem as illustrated in Figure 1.
To Access Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
D
With Torque
Finger
Wrench
:
tighten and then tighten per
Table 1.
D
Without Torque Wrench
:
Finger tighten and use an
appropriately sized wrench to
turn an additional 1/6 turn.
Operating Angle−Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes and 5/16" for
vapor-line valve sizes) to back the stem out
counterclockwise as far as it will go.
Operating Ball−Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open.
S
To open valve, roate stem counterclockwise 90°.
S
To close rotate stem clockwise 90°.
Reinstall Stem Cap:
Replace the stem cap and tighten as follows:
S
With Torque Wrench
: Finger
tighten and then tighten per Table 1.
S
Without Torque Wrench
: Finger
tighten and use an appropriately
sized wrench to turn an
additional 1/12 turn clockwise.
NOTE
Later in the procedure, the HFC−410A container
will be replace by the nitrogen container. A label with
specific torque requirements may be affixed to the stem
cap. If the label is present, use the specified torque.
