Hisense AVWT-72FHFSHA Instrucciones De Montaje página 37

< Heat Pump System >
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
< Heat Recovery System >
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
7.2 Vacuuming
Connect manifold gauge and vacuum pump to the check joints.
(1)
(1)
(2) Continue vacuum pumping for one to two hours until the pressure reaches
(2)
-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.
(3)
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.
●
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.
Outdoor Unit
Stop Valve
(Liquid Piping
High/Low
Pressure Gas Piping
Liquid Piping
Manifold Pipe Insulation
Outdoor Unit
Stop Valve
(Liquid Piping) Manifold
Gauge
Vacuum Pump
Liquid Piping
High/Low Pressure Gas Piping
Low Pressure
Gas Piping
Switch BOX
Insulation
Switch BOX
Manifold Pipe
Fig. 7.1 Air-Tight Test
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Manifold
Gauge
Siphonic Refrigerant Cylinder
(R410A)
Vacuum Pump
Weigher
Indoor Unit
(or Water Module)
[Cover the gas and liquid piping with
insulation.]
Nitrogen Tank
(for Nitrogen Blow during Brazing
and Air Tight Test)
Siphonic Refrigerant Cylinder
(R410A)
Weigher
(or Water Module)
Insulation
[Cover the gas and liquid piping with insulation.]
CAUTION
Stop Valve
Insulation
(Field-Supplied)
Refrigerant Piping
(Field-Supplied)
Fig. 7.2 Insulation on Pipes
29
Indoor Unit