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 inuence 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 insufcient charging could cause a compressor failure.
• Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difculty with breathing or harmful gases would occur
if a 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
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