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Si39-406
Installation
General Information
35
The evacuation of air conditioner piping provides the following effects.
1. Vacuum drying
2. Removes air and nitrogen (used in air-tightness test) from the inside of pipes.
Therefore, it is necessary to ensure that the both purposes have been achieved in the vacuum
drying operation.
Choosing a
Vacuum Pump
General
Refrigerant piping content volume of the VRVII R410A Series is larger than the VRV Inverter
Series, and consequently takes more time for vacuum drying. If you have time to spare, you may
use the same vacuum pump, but if you want to save time, you will have to use a pump with higher
exhaust velocity (exhaust volume).
The Necessity for Counter Flow Prevention
After the vacuum process of the refrigerant cycle, the inside of the hose will be vacuumed after
stopping the vacuum pump, and the vacuum pump oil may flow back. Moreover, if the vacuum
pump stops during the operation by some reason, the same thing happens.
In such cases, different oil mixes in the HFC system refrigerant apparatus cycle, and becomes the
cause of a refrigerant circuit trouble. Therefore, in order to prevent the counter flow from the
vacuum pump, a check valve is needed.
Vacuum pump with check valve or vacuum pump adapter
Key points
Lower the degree of vacuum to below –14.6psi (–755mmHg)
(V1216)
Vacuum pump adapter
Reverse flow preventive
vacuum adapter
Vacuum pump with
check valve
Summary of Contents for REYQ96MTJU
Page 1: ...Design Installation Testing Instruction R410A Heat Recovery 60Hz REYQ96MTJU Si39 406...
Page 6: ...Si39 406 iv Table of Contents...
Page 34: ...Installation Si39 406 28 General Information Flaring Procedure...
Page 68: ...Installation Si39 406 62 General Information Caution Caution label 3P124617 4P124614...
Page 114: ...Appendix Si39 406 108 General Information 3P135887 1...
Page 126: ...Appendix Si39 406 120 General Information 7 8 3 BS Unit BSVQ36MVJ BSVQ60MVJ 4D045338...
Page 128: ...Appendix Si39 406 122 General Information 7 9 2 Field Wiring REYQ96MTJU 3D042647A...
Page 156: ...Refrigerant Piping Si39 406 150 Installation Manual REYQ96MTJU...
Page 158: ...Refrigerant Piping Si39 406 152 Installation Manual REYQ96MTJU...
Page 230: ...Precautions for New Refrigerant R410A Si39 406 224 Precautions for New Refrigerant R410...
Page 236: ...375 Park Avenue Suite 3308 New York N Y 10152 info daikinac com www daikinac com...