Cautions During Service Operations (Changes Required By New Refrigerants); The Three Basic Rules For Refrigerant Piping Must Be More Strictly Observed - Daikin VRV Plus Series General Information Manual

Si33-003.book Page 180 Monday, June 25, 2001 9:06 AM

Cautions During Service Operations (Changes Required by New Refrigerants)

6. Cautions During Service Operations (Changes Required
by New Refrigerants)
6.1

The Three Basic Rules for Refrigerant Piping Must Be More Strictly Observed

With new refrigerants, the three basic rules for refrigerant piping must be more strictly observed during
piping as well as servicing.
1. Drying (no moisture)
There shall be no moisture in the pipe.
Water entering from outside, such as
rain.
Moisture due to dew condensation
occurring inside the pipe.
Clogging of expansion valve, capillary
tube, etc.
Insufficient cooling or heating.
Degradation of refringerating machine
oil.
Malfunction of compressor.
180
2. Cleaning (free of contamination)
There shall be no dust in the pipe.
Oxidized film generated during brazing.
Entering of dust, particles, oil, etc. from
outside.
Clogging of expansion valve, capillary
tube, etc.
Insufficient cooling or heating.
Degradation of refrigerating machine oil.
Malfunction of compressor.
Same as the items on the left.
Do not use tools or devices previously
used with a different type of refrigerant.
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SiE33-003
3. Tightening (air-tightness)
There shall be no refrigerant leak.
Insufficient brazing.
Inadequate flaring or insufficient
tightening torque.
Inadequate flange connection.
Gas shortage.
Insuffieient cooling or heating.
Temperature rising of discharge gas.
Degradation of refrigerating machine oil.
Malfunction of compressor.
Follow the basic brazing procedure.
Follow the basic flaring procedure.
Follow the basic flange connection
procedure.
Conduct an air-tightness test
(gas leak check).
New Refrigerant R-407C