Gree DC Inverter Multi VRF

DC INVERTER MULTI VRF INSTALLATION
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6 INSTALLATION OF REFRIGERANT PIPING
6.1 Flow Chart of Installation
6.2 Three Principles of Refrigerant Piping Installation
Keep to the three principles of refrigerant piping:
Key Factors
Measures to Avoid Failure
Dry z Invasion of outside water
Example: Rainwater, engineering
water
z Invasion of indoor condensate
Clean z Formation of oxides inside the
pipe during welding
z Invasion of dust and foreign
articles from outside
Airtight z Incomplete welding
z Leakage from flared port
z Leakage from edge
Installation of
indoor unit
Fabrication according to
piping design dimension
Installation of
connection pipes
Expel with nitrogen
Welding
Purge
A
irtight test
Vacuuming and
drying
F
a
b
r
i
cat
i
on o
f
fitting pipe
Purge
Vacuuming and
drying
Expel with nitrogen 0.05～0.3Mpa
Purge
F
a
b
r
i
cat
i
on o
f
fitting pipe
Use suitable materials
(copper tube, soldering bar)
Observe the basic
welding procedures.
Observe the basic operations
for flaring of fitting pipe
Observe the basic
interfacing procedures
Airtight test