7
English
REFRIGERANT PIPING
Piping Length & Elevation
If the pipe is too long, both the capacity and
reliability of the unit will drop. As the number
of bends increases, resistance to the flow of
refrigerant system increases, thus lowering
cooling capacity. As a result, the compressor may
become defective. Always choose the shortest
path and follow the recommendations as
tabulated below:
Outdoor Unit
Indoor Unit
Model
Min. allowable length (L)
Max. allowable length (L)
Max. allowable height (H)
Gas pipe
Liquid pipe
10
15
3m
15m
10m
O.D. 9.5mm O.D. 12.7mm
O.D. 6.4mm
L
H
*Be sure to add the proper amount of additional
refrigerant. Failure to do so may result in
reduced performance.
Remark:
The refrigerant pre-charged in the
outdoor unit is for piping length up to
7.5 m.
Piping Works
•
Do not use contaminated or damaged copper
tubing. Do not remove plastic, rubber plugs
and brass nuts from the valves, fittings, tubings
and coils until you are ready to connect suction
or liquid line into valves or fittings.
•
If any brazing work is required, ensure that
the nitrogen gas is passed through coil and
joints while the brazing work is being done.
This will eliminate soot formation on the
inside walls of the copper tubings.
•
Cut the connection pipe with a pipe cutter.
•
Remove burrs from cut edges of the pipes with
remover.
Hold the end of the pipe downwards to prevent
metal chips from entering the pipe.
•
Insert the flare nuts, mounted on the
connection parts of both the indoor unit and
outdoor unit onto the copper pipes.
•
Flare the pipe with extra length above the
flaring tool as shown in the table.
•
The flared edge must be even and not cracked
or scratched.
Ø Tube, D
A (mm)
Inch
mm
Imperial
Rigid
1/4"
6.35
1.3
0.7
3/8"
9.52
1.6
1.0
1/2"
12.70
1.9
1.3
5/8"
15.88
2.2
1.7
3/4"
19.05
2.5
2.0
Cutting copper tube
1/4t
Remove burr
Copper tube
Swaging block
