Johnson Controls YVAHP0721CW Series, Руководство по обслуживанию

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(3) Make sure that all stop valves for the outdoor unit are closed completely.
(4) Bleed nitrogen gas through refrigerant lines when brazing. Pressure should not exceed 2.9psi (0.02MPa).
(5) The air-tight test pressure of this product is 601psi (4.15MPa).
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NOTE
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 value of 212ºF
(100ºC) for gas piping.)
a) Cover the gas header with the insulation as shown
below.
For Gas Side For Liquid Side
Insulation
(Accessory)
Header for
Gas Line
Tape
(Accessory)
b) Seal the joint portion of insulation with tape
(accessory).
Tape
(Accessory) Closing Pipe
(Accessory)
Insulation for Gas
Line Closing Pipe
(Accessory)
c) Attach the insulation (accessory) to the closed-off
end of pipe. Then seal the joint portion with tape
(accessory).
Insulation for
Header Multi-Kit
Insulation
(Field-Supplied)
Tape
(Accessory)
(Accessory)
a) Braze the pipe cap to the open end of the liquid
header, opposite the liquid line connection. Cover
the liquid line header with the insulation after pipe
temperature decreases to room temperature.
b) Cut the sections of insulation for liquid piping as
often as required.
c) Seal the joint for the closed-off end of pipe with tape
(accessory) after attaching the liquid pipe insulation.
Header for
Liquid Line
Closing Pipe for Liquid Line Header
Insulation
(Accessory) Tape
(Accessory)
Tape
(Accessory)
Insulation for Liquid
Pipe Adjusted for
Attaching (Accessory)
Cut off as many as
required for field
connection.
Tape
(Accessory)
Closing Pipe
(Accessory)
Make sure that a test for leakage of refrigerant gases has been performed. The refrigerant used for this unit
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60
INSTALLATION