Daikin VRV II Series Design, Installation & Testing Instructions page 23

Si39-303
3.2.3 Refrigerant Pipe Work
!
The 3 Principles
The "3 principles of refrigerant piping" must be strictly observed
of Refrigerant
Piping
Make sure there is no moisture
inside the pipes
General Information
Operational steps
Install indoor unit Cut pipes to size
Solder
Cause of problem
l
Rainwater, work water,
etc. gets into pipes from
outside
l
Moisture generated inside
pipes due to condensation
l
Formation of oxides inside
pipes during soldering
l
Dirt, dust or other
extraneous material gets
into pipes from outside
l
Leak from soldered area
l
Leak from flared area
l
Leak from flange area
Dry
Fit pipes
provisionally
Flushing Air tight test
Actoin to avoid problem
Pipe covering
Replace nitrogen
Pipe covering
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
The 3 principles of refrigerant piping
Clean
Make sure there is no dirt inside the
pipe
Installation
Replace nitrogen
Vacuum drying
Flushing Vacuum drying
Flushing
Air tight test
Air tight
Make sure the refrigerant does not
leak out
(V0963)
(V0964)
17