30
P5417009-rev.6
6.2 Piping Connection Work
Comply with the restrictions for refrigerant piping (permissible length, height difference) in Sections 6.5 “Piping
Work Conditions” and “Piping Branch Restriction.” If not, the outdoor unit can become damaged or fail.
The stop valves are closed completely (factory-setting) when refrigerant piping connections are performed.
Do not open these stop valves until all the refrigerant pipes are connected, pressure tested, and vacuumed.
6.2.1 Stop Valve
Gas Valve
(1) Make sure that all the stop valves are closed completely.
(2) Connect the charging hose to the service port and release the gas inside the pipe.
(3) Cut the end of the closing pipe and ensure that no residual gas or oil exists inside the gas pipe.
(4) Remove any combustible material such as stop valve cover (cardboard) from unit before using a torch.
(Please see close pipe drawing below.)
(5) Remove the closing pipe from the brazing portion with a torch. Be careful that the flame doesn’t
damage the stop valve.
● Remove gas inside the closing pipe before the brazing work is performed.
If the brazing filler metal melts with residual gas inside, the pipe will explode and injuries can result.
● Do not expose surrounding parts and the oil return pipe of the compressor to flames when a torch
is used. If the oil return pipe is exposed to the fire, high temperature oil will spurt and cause a fire
or injury.
Figure 6.1
Heat Exchanger Fin
Heat
Exchanger
Stop Valve for Liquid Valve
Field-Work Side
Valve Stay
Torch
Closing Pipe
Metal Plate for
Protection
Stop Valve for Gas Pipe (Body)
(High/Low Pressure)
Stop Valve for Gas Pipe (Body)
(Low Pressure)
Stop Valve for
Liquid Valve
Stop Valve for Gas Valve
(High/Low Pressure)
Service Port
Stop Valve Cover (Cardboard)
(Read the precautions.)
End of Closing Pipe (
φ
1/4(6.35))
Closing Pipe
Cutting Portion
(
φ
1/4(6.35) Pipe)
Cut Here
Stop Valve for Gas Valve
(Low Pressure)
