Operating Gauge Set and Service Valves
IMPORTANT
To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for refrigerant recovery, flushing, leak testing, evacuating, weighing in refrigerant and optimizing system charge.
Each valve is equipped with a service port which has a factory−installed valve core. Figure 2 provides information on how to access and operate both angle− and ball−type service valves.
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold gauge set that features low−loss anti−blow back fittings.
Manifold gauge set used for HFC−410A refrigerant systems must be capable of handling the higher system operating pressures. The manifold gauges should be rated for:
SHigh side
square inch gauge (psig)
SLow side sig with dampened speed to 500 psig
SManifold gauge set hoses must be rated for use to 800 psig of pressure with a 4000 psig burst rating.
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 to open
the service valve.
| SERVICE PORT CAP | TO INDOOR |
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| UNIT |
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| SERVICE PORT CORE |
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SERVICE PORT |
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| TO OUTDOOR |
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CORE | (VALVE STEM SHOWN OPEN) | UNIT | VALVE STEM | |
| INSERT HEX WRENCH HERE |
| SHOWN | |
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| CLOSED |
2INSERT HEX−HEAD EXTENSION HERE
TO INDOOR 
UNIT
TO OUTDOOR UNIT
STEM CAP
1 REMOVE
When service valve stem is in the CLOSED position,STEM CAP the service port is open to the line set and indoor unit.
When service valve is OPEN, the service port is open to line set, indoor and outdoor unit.
To Access Service Port:
Operating Ball−Type Service Valve:
1.Remove stem cap with an appropriately sized wrench.
2.Use an appropriately sized wrenched to open.
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 set to service port. |
1/6 TURN
11 12 1
10 2
98 
543
A To open rotate stem |
counterclockwise |
TO INDOOR UNIT
3. When testing is completed, replace service port cap and |
tighten as follows: |
7 6
90°. |
BTo close rotate stem
clockwise 90°.
SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP
BALL (SHOWN CLOSED)
2 VALVE STEM
SWith torque wrench: Finger tighten and torque cap per table 1.
SWithout torque wrench: Finger tighten and use an appropriately sized wrench to turn an additional 1/6 turn clockwise.
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| 1/12 TURN | |
Reinstall Stem Cap: |
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Stem cap protects the valve stem from damage and |
| 11 | 12 1 |
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serves as the primary seal. Replace the stem cap and |
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tighten as follows: | 10 |
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S With Torque Wrench: Finger tighten and then | 9 |
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8 | 7 | 6 | 5 | 4 | ||
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torque cap per table 1. |
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TO OUTDOOR UNIT | REMOVE |
| 1 STEM CAP |
SWithout Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/12 turn clockwise.
NOTE | que. |
Figure 2. Angle and Ball−Type Service Valves
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