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7. Air-Tight Test and Additional Refrigerant Charge
7. Air-Tight Test and Additional Refrigerant Charge
7.1 Air-Tight Test
1. Check to ensure that spindles of the stop valves for gas and liquid pipes are closed completely before
air-tight test.
Check the cap shape and tighten according to the torque specification as shown in the table below.
2. The refrigerant used for this outdoor unit is R410A. Use the manifold gauge and the charging hose for
exclusive use of R410A.
< Tightening Check of Stop Valves >
After connecting the pipe, remove the caps of stop valves for gas and liquid. Tighten the open-close
spindle in the closing direction according to the following tightening torque.
•
Caution for Operation of Stop Valves
1. Remove the stop valve caps before performing the air-tight test after connecting the refrigerant piping.
Tighten the spindle (valve) in clockwise direction according to the following tightening torque.
2. Perform the work after warming the spindle part with a dryer etc. when controlling the stop valve in
a cold area.
(O-ring of the spindle part will harden at the low temperature and the refrigerant leakage may occur.)
3. Do not apply excessive force after fully opening the spindle. (Tightening Torque: < 5.0N-m)
(The back seat is not provided.)
4. When each valve is opened, remove tags "Close" (Accessories) and attach tags "Open" instead.
Do NOT put two
wrenches here.
Stop Valve
for Liquid Pipe
Position both wrenches
here.
< CNCCLW >
Outdoor Unit
Spindle (Valve)
(Base Unit)
Gas
Valve
8 - 14HP
16 - 20HP
22.0 - 28.0
22 - 30HP
< Air-Tight Test Method >
1. Connect the manifold gauge to the check joints of the liquid line and the gas line stop valves using
charging hoses with a vacuum pump or a nitrogen cylinder.
Perform the air-tight test.
Do not open the stop valves. Apply nitrogen gas pressure of 4.15MPa for SET FREE "air365 Max" series.
For checking gas leakage, use the leak detector or forming agent. If there is any leakage, fix the leaking
part.
2. For checking gas leakage, do not use a forming agent which generates ammonia.
Additionally, do NOT use a household detergent as forming agent whose components are not clear.
The recommended forming agent for checking gas leakage is shown in the table.
Procedure
Completion of
Ref. Piping
58
Stop Valve
for Gas
Flare Nut
Tightening Torque (N·m)
Flare Nut
Liquid
Liquid
Valve
33.0 - 42.0
7.0 - 9.0
50.0 - 62.0
9.0 - 11.0
68.0 - 84.0
Applying
Check of
Nitrogen Gas
Pressure Decrease
Repairing of
Leakage Part
Cap
Hexagonal Wrench
(To open or close
the stop valve)
O-ring
(Rubber)
Cap
Cap
Gas
Liquid
Valve
Valve
33.0 - 42.0
42.0 - 48.0
50.0 - 62.0
Pass
Access Port
(Only the charging hose for
R410A can be connected.)
Refrigerant Pressure
Stop Valve
Counterclockwise...Open
Clockwise...............Close
Closed before Shipment
Hexagonal Wrench
Check Joint
Gas
Liquid
Gas
Valve
Valve
Valve
9.0 - 14.0 14.0 - 18.0
10
Recommended
Manufacturer
Forming Agent
Yokogawa
Guproflex
& CO., Ltd.
Size
(mm)
Liquid
Valve
4
5
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