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7.
Additional Refrigerant Charge
7.1
Air-Tight Test
Liquid Valve
Cap
Tightening Torque: b N·m
O-ring
Hexagonal Wrench
Used to open/close
spindle valve
Refrigerant
Pressure
Spindle Valve
Counterterclockwise......Open
Clockwise......Close
Refrigerant Piping
<Gas Valve>
Tighening Torque: a N·m
Procedure
Completion of
Ref. Piping
Charging
Nitrogen Gas
Check of Pressure
Decrease
Pass
Fix Leakage
(1)Check to ensure that the stop valves are closed completely before air-tight test.
<Tightening Check of Stop Valves>
After connecting the pipe, remove the cap of stop valve for liquid.
Check Joint for Service Port
For charging additional refrigerant only
Valve-closing torque: 11.1ft·lbs (15 N·m)
(2) Connect the indoor units and the outdoor unit with field-supplied refrigerant piping.
Suspend the refrigerant piping at specified points and prevent the refrigerant piping from touching weak
parts of the building such as wall, ceiling, etc.. Vibration of the piping may give abnormal sound.
(3) Connect the manifold gauge to a vacuum pump or a nitrogen cylinder and the check joint of the
liquid stop valves and gas stop valves with charging hoses.
(4) Apply nitrogen gas pressure of 601psi(4.15MPa).
Do not open the stop valves.
(5) Check for any gas leakage at the flare nut connections, or brazed parts by use of a foaming agent or
gas leak detector.
(6) Mount the piping insulation materials after connecting the pipe.
DANGER
Be sure to use Nitrogen Gas for air-tight test. If other gases such as oxygen gas, acetylene gas or
fluorocarbon gas are accidentally used, it may cause explosion or gas intoxication.
28
Model
Torque a
ft·lbs(N·m)
Torque b
72~96
5.2(7)
7.4(10) 22.1(30)
9.6(13) 25.8(35)
18.4(25)
120
144~192
ft·lbs(N·m)
<Liquid Valve>
Check Joint for Service Port
Only the charge hose can be
connected
Tightening torque: a ft·lbs(N·m)
Cap Tightening torque: b N·m
O-ring
Allen Wrench
Open/close
spindle valve
Spindle Valve
Counterclockwise......open
Clockwise......close
Tightening torque: c ft·lbs
(N·m)
Refrigerant Pressure
Gas Valve
Model
Torque a
ft·lbs(N·m)
Torque b
72~192
11.1(15)
40.5(55)
ft·lbs(N·m)
Torque c
ft·lbs(N·m)
22.1(30)
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