LUU189HV Installation Manual

12
CONNECTING COPPER PIPES
ENGLISH
NOTE
!
Always blow nitrogen into pipe which is brazed. Always use a non-oxidizing brazing material
for brazing the parts and do not use flux. If not, oxidized film can cause clogging or damage
to the compressor unit and flux can harm the copper piping or refrigerant oil.
• The torch tip should be positioned at the opposite angle to shop the correct way to apply
heat on the pipe coupling.
1 Refrigerant piping 4 Taping
2 Pipe to be brazed 5 Valve
3 Nitrogen 6 Pressure-reducing valve
Plumbing materials and storage methods
Pipe must be able to obtain the specified thickness and
should be used with low impurities. Also when handling
storage, pipe must be careful to prevent a fracture,
deformity and wound.
Should not be mixed with contaminations such as dust,
moisture.
Refrigerant piping on three principles
Drying Cleanliness Airtight
Should be no moisture inside No dust inside. There is no refrigerant leakage
Items
Moisture
Dust
Leakage
Cause failure
- Significant hydrolysis of refrigerant
oil
- Degradation of refrigerant oil
- Poor insulation of the compressor
- Do not cold and warm
- Clogging of EEV, Capillary
- Degradation of refrigerant oil
- Poor insulation of the compressor
- Do not cold and warm
- Clogging of EEV, Capillary
- Gas shortages
- Degradation of refrigerant oil
- Poor insulation of the compressor
- Do not cold and warm
Countermeasure
- No moisture in the pipe
- Until the connection is completed,
the plumbing pipe entrance should
be strictly controlled.
- Stop plumbing at rainy day.
- Pipe entrance should be taken
side or bottom.
- When removal burr after cutting
pipe, pipe entrance should be
taken down.
- Pipe entrance should be fitted cap
when pass through the walls.
- No dust in the pipe.
- Until the connection is completed,
the plumbing pipe entrance should
be strictly controlled.
- Pipe entrance should be taken
side or bottom.
- When removal burr after cutting
pipe, pipe entrance should be
taken down.
- Pipe entrance should be fitted cap
when pass through the walls.
- Airtightness test should be.
- Brazing operations to comply with
standards.
- Flare to comply with standards.
- Flange connections to comply with
standards.
3
2
1
45
6