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English
REFRIGERANT PIPING
MAXIMUM PIPE LENGTH AND MAXIMUM
NUMBER OF BENDS
When the pipe length becomes too long, both the capacity
and reliability drop. As the number of bends increases,
system piping resistance to the refrigerant flow increases,
thus lowering the cooling capacity. As a result, compressor
reliability will be affected. Always choose the
shortest path and follow the recommendation as tabulated
below:
PIPING WORKS AND FLARING TECHNIQUE
Do not use contaminated or damaged copper tubing. If any
piping, evaporator or condenser had been exposed or had
been opened for 15 seconds or more, vacuum the system.
Generally, do not remove plastic, rubber plugs and brass
nuts from the valves, fittings, tubings and coils until it is
ready for connection.
If any brazing work is required, ensure that the nitrogen gas
is passed through piping and joints while the brazing work
is being done. This will eliminate soot formation on the
inside walls of the copper tubings.
Cut the pipe stage by stage, advancing the blade of pipe
cutter slowly. Extra force and deep cut will cause more
distortion of pipe and therefore extra burr.
Remove burrs from cut edges of pipes with a remover as
shown in Fig. R. This will avoid unevenness on the flare
faces which will cause gas leak. Hold the pipe on top position
and burr remover at lower position to prevent metal chips
from entering the pipe.
Insert the flare nuts mounted on the connection parts of both
indoor and outdoor unit, into the copper pipes.
The exact length of pipe protruding from the face of the
flare die is determined by the flaring tool.
Fix the pipe firmly on the flare die. Match the centers of
both the flare die and the flaring punch, and tighten flaring
punch fully.
1/4t
CUTTING COPPER TUBE
Fig. R
Model
10
15
20
25
Data
Maximum Length (m)
7
10
15
15
Maximum Elevation (m)
5
5
8
8
Maximum No. of Bends (m)
10
10
10
10
20 m
MAX. PIPING LENGTH
MAX. ELEV
A
TION HEIGHT
20 m
MAX. PIPING LENGTH
MAX. ELEV
A
TION HEIGHT
REMOVE BURR
COPPER TUBE
SWAGING BLOCK
Model
30
40
50
60
Data
Maximum Length (m)
20
20
20
20
Maximum Elevation (m)
10
10
10
10
Maximum No. of Bends (m)
10
10
10
8
20 m
20 m
D
A
CCC-0700 (01~16) ENG*
2/1/01, 10:42 AM
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