Installation
SiEN34-705
22
General Information
3.2.3 Refrigerant Pipe Work
!
Operational steps
The 3 Principles
of Refrigerant
Piping
The “3 principles of refrigerant piping” must be strictly observed
Fit pipes
provisionally
Install indoor unit
Solder
Flushing
Air tight test
Vacuum drying
Cut pipes to size
Replace nitrogen
(V0963)
The 3 principles of refrigerant piping
Dry
Clean
Air tight
Make sure there is no moisture
inside the pipes
Make sure there is no dirt inside the
pipe
Make sure the refrigerant does not
leak out
Actoin to avoid problem
Cause of problem
Rainwater, work water, etc.
gets into pipes from outside
Moisture generated inside
pipes due to condensation
Formation of oxides inside
pipes during soldering
Dirt, dust or other
extraneous material gets
into pipes from outside
Leak from soldered area
Leak from flared area
Leak from flange area
Pipe covering
Flushing
Replace nitrogen
Pipe covering
Air tight test
Flushing
Vacuum drying
Use the proper materials (copper pipe,
solder, etc.)
Adhere strictly to standard soldering
work practice
Adhere strictly to standard flaring work
practice
Adhere strictly to standard flange
connection work parctice
Clean
Dr
y
Air tight
(V0964)
Moisture
Dirt
Leak
