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Si33-102.book Page 15 Tuesday, June 26, 2001 3:18 PM
SiE33-102
3.2.3 Refrigerant Pipe Work
Operational steps
Install indoor unit
Solder
The 3 Principles of The "3 principles of refrigerant piping" must be strictly observed
Refrigerant Piping
Cause of problem
l
l
l
l
l
l
l
Make sure there is no moisture
inside the pipes
General Information
Cut pipes to size
Flushing
Rainwater, work water,
etc. gets into pipes from
outside Pipe covering
Moisture generated inside
pipes due to condensation
Formation of oxides inside
pipes during soldering
Replace nitrogen
Dirt, dust or other
extraneous material gets Pipe covering
into pipes from outside
Leak from soldered area
Use the proper materials (copper pipe,
solder, etc.)
Adhere strictly to standard soldering
work practice
Leak from flared area
Adhere strictly to standard flaring work
practice
Leak from flange area
Adhere strictly to standard flange
connection work parctice
The 3 princples of refrigerant piping
Dry Clean
Make sure there is no dirt inside the
pipe

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Installation
Fit pipes
Replace nitrogen
provisionally
Air tight test Vacuum drying
Actoin to avoid problem
Flushing Vacuum drying
Flushing
Air tight test
Air tight
Make sure the refrigerant does not
leak out
(V0963)
(V0964)
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