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f Adding the heating refrigerant
f
1) When recharging the heating refrigerant, connect the low pressure pipe from manifold gage to the suction charging
port .
2) Press the function key for adding refrigerant in heating mode .
3) After 20 minutes of operation, open the valve on suction charge port .
4) Open the valve for low pressure side on the manifold gage to recharge the remaining refrigerant .
• Open the gas side and liquid side service valve completely after charging the refrigerant . (If you operate the Air
to Water Heat Pump with the service valve closed, the important parts may be damaged . )
CAUTION
To close the valve stem
1 . Open the cap and turn the valve stem clockwise by using a hexagonal wrench .
Tightening torque
for body cap
(Refer to the table)
Charging core
Tightening torque
for charging port cap
(Refer to the table)
2 . Tighten the valve stem until it reached the sealing edge .
• Do not apply excessive force to the valve stem and always use special instruments . Otherwise, the contact
surface between valve stem and sealing edge can be damaged and refrigerant can leak through this damaged
NOTE
surface .
• If refrigerant would leak, turn the valve stem back by half and tighten the valve stem again, then check the
leakage . If there is no leakage any more, tighten the valve stem entirely .
3 . Tighten the cap securely .
To open the valve stem
1 . Remove the cap .
2 . Turn the valve stem counterclockwise by using a hexagonal wrench .
3 . Turn the valve stem until it is stopped .
4 . Tighten the cap securely .
• When you use the service port, always use a charging hose, too .
• Check the leakage of refrigerant gas after tightening the cap .
CAUTION
• Must use a spanner and wrench when you open/tighten the valve stem .
Outer Diameter
Stem
(mm)
ø6 . 3 5
ø9 . 5 2
ø12 . 7 0
Sealing
edge
ø15 . 8 8
ø19 . 0 5
❋ ❋ 1 N•m = 10 kgf•cm
ENGLISH-35
Tightening torque (N•m)
Charging port
Body cap
cap
20 ~ 25
10 ~ 12
Operating torque (N•m)
Stem
Max 5
Max 5
Max 5
Max 5
Max 12
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