ENGLISH-40
Refrigerant piping work
f
Adding the heating refrigerant
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
Sealing
edge
Stem
Tightening torque
for charging port cap
(Refer to the table)
Outer Diameter
(mm)
Tightening torque (N•m)
Operating torque (N•m)
Body cap
Charging port
cap
Stem
ø6.35
20 ~ 25
10 ~ 12
Max 5
ø9.52
Max 5
ø12.70
Max 5
ø15.88
Max 5
ø19.05
Max 12
❋
1 N•m = 10 kgf•cm
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
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.
NOTE
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.
• Must use a spanner and wrench when you open/tighten the valve stem.
CAUTION
