Johnson Controls YVAHP072B31S, Service Manual

Page: 854 / 1796

After installation, it is recommended that the customer retain this manual for future reference.
4. Make sure that all stop valves for the outdoor unit are closed completely.
5. Bleed nitrogen gas through piping during brazing. Pressure not to exceed 2.9psi (0.2MPa).
6. The airtight test pressure for this product is 601psi (4.15MPa).
7. Install the supplied insulation with these multi-kits to each branch (liquid side and gas side), with tape. Also,
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temperature. Anything done immediately after brazing can cause 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 a heat resistance of 212ºF (100ºC)
for gas piping.)
Do not leave any
gaps between layers
of insulation.
Insulation (Field-Supplied)
After positioning all insulation with tape,
follow up and secure it permanently
with a second application of tape.
Insulation for Gas and
Liquid Line (Accessory)
Insulation Tape (Field-Supplied)
Wrap insulation tape between the accessory
insulation and the field-supplied insulation.
There should be no gaps showing.
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INSTALLATION