Johnson Controls YVAHP0721CW Series, Service Manual

Page: 143 / 416

After installation, it is recommended that the customer retain this manual for future reference.
4. Make sure that all stop valves of the outdoor unit are closed completely.
5. Bleed nitrogen gas through refrigerant lines when brazing. Pressure should not exceed 2.9psi (0.02MPa).
6. The air-tight test pressure for this product is 601psi (4.15MPa).
7.
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NOTE
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temperature. Anything done immediately after brazing can cause the insulation to melt.
Ɣ During piping work, always cover over or plug the open end to keep the inside free of dust and moisture.
Make sure that a test for leakage of refrigerant gases has been performed. The refrigerant used for this unit
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When polyethylene foam is applied, a thickness of 13/32 inch (10mm) for liquid piping and 19/32 to 25/32 inch
(15 to 20mm) for gas piping is recommended. (Use a grade of insulation with heat resistance value of 212ºF
(100ºC) for gas piping.)
Do NOT leave a gap
between the insulation.
Insulation (Field-Supplied)
Fix the insulation with
tape (accessory) completely
after taping temporary.
Insulation for Gas and
Liquid Line (Accessory)
Insulation Tape (Field-Supplied)
Wrap the insultation tape without gap between
accessory insulation and field-supplied insulation.
60
INSTALLATION