Installation Manual

18 Vertical Air Handling Unit
3
2
1
45
6
1 Refrigerant piping 4 Taping
2 Pipe to be brazed 5 Valve
3 Nitrogen 6 Pressure-reducing valve
CAUTION
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.
!
Note : The torch tip should be positioned at the opposite angle to shop the
correct way to apply heat on the pipe coupling.
Installation
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.
Plumbing materials and storage methods
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
Countermeas
ure
- 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.