Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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57
Recommended
Forming Agent
Manufacturer
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Yokogawa
& CO.,Ltd
< Airtight 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 airtight test.
Do not open the stop valves. Apply nitrogen gas pressure of 601 psi (4.15MPa).
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leaking part.
(2) For checking gas leakage, do not use a forming agent which generates ammonia.
Additionally, do NOT use any household detergent as forming agent with potentially unknown or
harmful ingredients.
The recommended forming agent to detect leaking refrigerant gas is shown below.
NOTE:
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If not performed in this manner, the expansion valve for the outdoor unit, or indoor unit can close up,
making any airtight test impossible.
Be sure to use nitrogen gas for the airtight test. If other gases such as oxygen gas, acetylene gas or
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< Insulation Work >
(1) Securely insulate the gas piping side and liquid piping side individually.
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(2) Seal the gap between the bottom base or front piping cover and pipes with the insulation.
NOTICE:
If the gap is not sealed, damage can occur from rain, snow, animals, or insects that can gain entry.
Completion of
Ref. Piping
Repairing of
Leakage Part
Check of
Pressure Decrease
Applying
Nitrogen Gas
Pass
Procedure
Power Supply Wiring
Seal
Conduit Tube
Communication Cable
Rubber Bushing
For Wiring from Bottom Base For Piping from Front Piping Cover
Seal these gaps with insulation (field-supplied).
Liquid Pipe Gas Pipe Piping Cover