48
Do not apply excessive force to the stop valve after fully opening. Otherwise, the stop valve will blow out due
to refrigerant pressure. At the test run, fully open the stop valve. Otherwise, these devices will be damaged.
(It is closed before shipment.)
Caution for Opening Stop Valve
1. Do not apply an excessive force after fully opening the stop valve (Tightening Torque: < 5.0 N·m).
(This valve does not have a hard stop when opening, and allows for the complete removal of the valve
stem.)
2. Securely tighten the caps according to the torque specifications in Section 7.2.1 after each stop valve is
opened.
Hexagonal Wrench Size [mm]
Model
Gas Valve Liquid Valve
76, 96
5
5
114
, 136, 154
10
170 - 190
9.3 Charging Work
(1) An additional refrigerant charge is required according to total piping length. Refer to Table 9.1.
(2) After vacuum pumping work, check that the high/low pressure gas valve (low pressure gas valve is for
heat recovery system only), and liquid stop valve are fully closed.
Charge the additional refrigerant from the access port of liquid stop valve (acceptable error must
be within 0.5 kg).
(3) After refrigerant has been charged, fully open the liquid stop valve and gas stop valves.
Gas remaining at the O-ring or screw component may emit a hissing sound when removing the stop
valve cap. However, this is not leaking gas.
(4) If it proves impossible to dispense the specified (charged) quantity of refrigerant, follow the procedure
below.
(a) Fully open the stop valve at the gas line side (for heat recovery system, both stop valves of high/low
pressure and low pressure side).
(b) Operate the compressor in the cooling mode and charge the additional refrigerant from the access
port of the liquid stop valve. An acceptable error must fall within 0.5 kg. At this time, keep
the liquid stop valve slightly open.
(c) After the refrigerant is charged, fully open the liquid stop valve and the gas stop valve.
(d) Carefully calculate any additional refrigerant quantity for charging. If the quantity of additional
refrigerant is not correct, it might cause a compressor failure. The additional refrigerant must be
charged in a liquid condition.
(e) Refrigerant charge from the access port on the gas stop valve can lead to compressor failure.
Be sure to charge refrigerant from the access port on the liquid stop valve.
Refrigerant
Pressure
Stop Valve
Counterclockwise...Open
Clockwise...............Close
Only the charging
hose for R410A
can be connected.
Access Port
Cap
O-ring
(Rubber)
Hexagonal
Wrench
To open or
close the
stop valve
Closed before Shipment
Summary of Contents for AVWW-114FKFW
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