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8. Service valve operation
Always install a cap on the charging port
CAUTION
There is a risk of refrigerant leakage
• The stem and stem cap must be securely tightened with the torque indicated below.
In absence of a torque wrench for liquid-side stem tightening, tighten the stem by approximately 45° more than
the protruding state.
• The flare nut should be securely tightened using a defined torque wrench suitable for the pipe size.
Tightening
locations
Valve type
Ø12.7 mm
Ø25.4 mm
<Liquid Side>
Flare nut
Flare nut
Tightening
Front-seated
torque
position
49 to 61 N·m
7 to 9 N·m
Brazed type
19 to 21 N·m
Valve unit
Stopper
Stem
Back-seated
position
0 N·m
34 to 42 N·m
19 to 21 N·m
<Gas Side>
O
S
<Ball valve operating unit position>
stopper.
20
Stem cap
Charge port
14 to 18 N·m
Valve unit
O
S
Stopper
SHC
Fully open
O
S
Stopper
SHC
Fully open
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