ENGLISH
6.2.1 Brazing work
! CAUTION
• Use nitrogen gas for blowing during pipe brazing. If oxygen, acetylene or uorocarbon gas is used, it will cause an explosion or poisonous gas.
• A lot of oxidation lm will occur inside of tubes if no nitrogen gas blowing is performed during brazing work. This lm will be ecked off after
operation and will circulate in the cycle, resulting in clogged expansion valves, etc. This will cause bad inuence to the compressor.
• Use a reducer valve when nitrogen gas blowing is performed during brazing. The gas pressure should be maintained within 0.03 to 0.05 MPa. If a
excessively high pressure is applied to a pipe, it will cause an explosion.
6.2.2 Refrigerant charge
! CAUTION
• Do not charge OXYGEN, ACETYLENE, or other ammable and poisonous gases into the refrigerant because an explosion can occur. It is
recommended that oxygen free nitrogen be charged for these types of tests cycle when performing a leakage test or an airtight test. These types
of gases are extremely dangerous.
• Insulate the unions and are-nuts at the piping connection part completely.
• Insulate the liquid piping completely to avoid a decrease of performance; if not, it will cause sweating on the surface of the pipe.
• Charge refrigerant correctly. Overcharging or insufcient charging could cause a compressor failure.
• Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difculty with breathing or harmful gases would occur
if a îš¿re were being used in the room.
• If the are nut is tightened too hard, the are nut may crack after a long time and cause refrigerant leakage.
6.2.3 Drain Piping
6.2.3.1 Drain Discharging Boss
When the base of the outdoor unit is temporarily utilized as a drain receiver and the drain water in it is discharged, this drain boss is
utilized to connect the drain piping.
Model Applicable Model
DBS-26
RASM-(4-6)(V)NE
RAS-(4-10)WH(V)NPE
DBS-12L RASM-(2/3)VRE
REFRIGERANT AND WATER PIPING
PMML0575 rev.2 - 03/2022
49
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