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Installing the Refrigerant Pipe Work
• Adding the cooling refrigerant
– Press the function key for adding refrigerant in
cooling mode.
– After 20 minutes of operation, open the valve on
gas side.
– Open the valve for low pressure side on the
manifold gauge to recharge the remaining
refrigerant.
• Adding the heating refrigerant
– When recharging the heating refrigerant, connect
the low pressure pipe from manifold gage to the
suction charging port.
– Press the function key for adding refrigerant in
heating mode.
– After 20 minutes of operation, open the valve on
suction charge port.
– Open the valve for low pressure side on the
manifold gage to recharge the remaining
refrigerant.
CAUTION
• 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.)
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To Close the Valve Stem
Cap
Service port
1 Open the cap and turn the valve stem clockwise by
using a hexagonal wrench.
2 Tighten the valve stem until it reached the sealing
edge.
NOTE
• 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.
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.
CAUTION
• 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.
Valve stem
Sealing edge
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