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SiUS34-801A_b
Test Operation
VRVIII R-410A Heat Recovery 60Hz
223
10.2.3 Air Tight Test and Vacuum Drying
After finishing piping work, carry out air tight test and vacuum drying.
Note:
Always use nitrogen gas for the air-tightness test.
Absolutely do not open the shutoff valve until the main power circuit insulation measurement
has been completed. If you measure after the shutoff valve is opened, it will cause the insulation
value to drop.
<Needed tools>
<The system for air tight test and vacuum drying>
Referring to figure 25, connect a nitrogen tank, refrigerant tank, and a vacuum pump to the
outside unit.
The refrigerant tank and the charge hose connection to refrigerant charge port or the valve A in
figure 25 are needed in
10.2.6 Additional Refrigerant Charge and Check Operation
.
Note:
The air-tightness test and vacuum drying should be done using the service ports of equalizer
pipe, HP/LP gas pipe, suction gas pipe and liquid pipe shutoff valve.
See the [R-410A] Label attached to the front plate of the outside unit for details on the location
of the service port (see figure in page 238)
See
[Shutoff valve operation procedure]
in
10.2.6.1 Before working
for details on handling
the shutoff valve.
The refrigerant charge port is connected to unit pipe.
When shipped, the unit contains the refrigerant, so use caution when attaching the charge hose.
Gauge manifold
Charge hose valve
• To prevent entry of any impurities and to ensure sufficient pressure resistance,
always use the special tools dedicated for R-410A.
• Use a charge hose that has a pushing stick for connecting to the service ports
of shutoff valves or refrigerant charge port.
Vacuum pump
• The vacuum pump for vacuum drying should be able to lower the pressure to
–14.6 psi.
• Take care the pump oil never flows backward into the refrigerant pipe during the
pump stops.
Gauge manifold
Nitrogen
Measuring
device
R-410A tank (with siphon) Vacuum pump
Charge hose
Equalizer pipe shutoff valve
HP/LP gas pipe shutoff valve
Suction gas pipe shutoff valve
Liquid pipe shutoff valve
Valve B
Outside unit Outside unit
To BS
(or indoor) unit
: Shutoff valve
Refrigerant charge port
Valve A
(
)
: Field piping
: Gas flow
Valve C
: Service port
figure 25
Gauge manifold
Nitrogen
Measuring
device
R-410A tank (with siphon) Vacuum pump
Charge hose
Refrigerant charge port
HP/LP gas pipe shutoff valve
Suction gas pipe shutoff valve
Liquid pipe shutoff valve
Valve C
Outside unit
To BS (or indoor) unit
Valve A
Valve B
: Field piping
: Gas flow
(
)
: Shutoff valve
: Service port
REYQ72~120PYDN
REYQ72~144PTJU
REMQ72~120PYDN
REMQ72~120PTJU
Summary of Contents for VRV III
Page 15: ...SiUS34 801A_b xiv ...
Page 23: ...Model Selection SiUS34 801A_b 8 General Information ...
Page 133: ...Field Settings SiUS34 801A_b 118 VRVIII R 410A Heat Pump 60Hz ...
Page 254: ...SiUS34 801A_b Test Operation VRVIII R 410A Heat Recovery 60Hz 239 R 410A Label R 410A Label ...
Page 329: ...Field Setting SiUS34 801A_b 314 Indoor Unit ...
Page 340: ...SiUS34 801A_b Troubleshooting by Remote Controller Troubleshooting 325 ...
Page 490: ...SiUS34 801A_b Piping Diagrams Appendix 475 Heat Pump 230V RXYQ72 96 120PTJU 3D058636A ...
Page 491: ...Piping Diagrams SiUS34 801A_b 476 Appendix Heat Pump 230V RXYQ144PTJU 3D058640 ...
Page 492: ...SiUS34 801A_b Piping Diagrams Appendix 477 Heat Recovery 460V REYQ72 96 120PYDN 3D058639A ...
Page 493: ...Piping Diagrams SiUS34 801A_b 478 Appendix Heat Recovery 460V REMQ72PYDN 3D058637A ...
Page 494: ...SiUS34 801A_b Piping Diagrams Appendix 479 Heat Recovery 460V REMQ96 120PYDN 3D058638A ...
Page 495: ...Piping Diagrams SiUS34 801A_b 480 Appendix Heat Recovery 230V REYQ72 96 120PTJU 3D058639A ...
Page 496: ...SiUS34 801A_b Piping Diagrams Appendix 481 Heat Recovery 230V REYQ144PTJU 3D058640 ...
Page 497: ...Piping Diagrams SiUS34 801A_b 482 Appendix Heat Recovery 230V REMQ72PTJU 3D058637A ...
Page 498: ...SiUS34 801A_b Piping Diagrams Appendix 483 Heat Recovery 230V REMQ96 120PTJU 3D058638A ...
Page 501: ...Piping Diagrams SiUS34 801A_b 486 Appendix 1 3 BS Unit 4D057985A ...
Page 537: ...Piping Installation Point SiUS34 801A_b 522 Appendix ...
Page 543: ...Pressure Sensor SiUS34 801A_b 528 Appendix ...
Page 563: ...SiUS34 801A_b iv Index ...