Loading ...
Loading ...
Loading ...
Fig. 7.1 Air-Tight Test
(1) Connect manifold gauge and vacuum pump to the check joints.
(2) Continue vacuum pumping for one to two hours until the pressure reaches
-14.5Psi(-0.1MPa /-756mmHg)or lower.
After vacuum pumping, stop the valve of manifold gauge, stop the vacuum pump and leave it for one hour.
Check to ensure that the pressure in the manifold gauge does not increase.
(3) Tighten the cap of check joint after vacuum pumping.
NOTES:
1. If tools or measuring instruments come into contact with the refrigerant, use the tools or the
measuring instruments exclusively for R410A.
2. If vacuum degree of -14.5Psi(-0.1MPa /-756mmHg) is not available, it is considered that there is a
gas leakage. Check for any gas leakage once again. If no leakage exists, operate the vacuum
pump for one to two hours.
7.2 Vacuuming
29
Stop Valve
(Liquid Piping)
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
High/Low Pressure Gas Piping
Liquid Piping
Insulation
Switch BOX
[Cover the gas and liquid piping with insulation.]
Switch BOX
Outdoor Unit
Vacuum Pump
Siphonic Refrigerant Cylinder
(R410A)
Weigher
Nitrogen Tank
(for Nitrogen Blow during Brazing
and Air Tight Test)
Indoor Unit
Manifold Pipe
Manifold
Gauge
Insulation
Outdoor Unit
Stop Valve
Manifold
Gauge
Vacuum Pump
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Siphonic Refrigerant Cylinder
(R410A)
Weigher
High/Low
Pressure Gas Piping
Liquid Piping
(Liquid Piping
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
Manifold Pipe
Insulation
Indoor Unit
(or Water Module)
[Cover the gas and liquid piping with
insulation.]
(or Water Module)
Low Pressure
Gas Piping
< Heat Pump System >
< Heat Recovery System >
Stop Valve
Insulation
(Field-Supplied)
Refrigerant Piping
(Field-Supplied)
Fig. 7.2 Insulation on Pipes
Insulate the refrigerant pipes as shown in Fig.7.2. After
connecting the refrigerant piping, seal the refrigerant pipes
by using the field-supplied insulation material. Insulate the
unions and flare nuts at the piping connections completely.
Insulate the liquid piping and gas piping completely to
avoid decreasing of performance and dewing on the
surface of the pipe.
●
CAUTION
(1)
(2)
(3)
Loading ...
Loading ...
Loading ...