AUX ALCF-H18/NDR3HA, Service Manual

Page: 146 / 174

R32
High Efficiency DC Inverter LCAC
7. Connection piping installation
7.1 Installation precaution
Please choose the phosphorus deoxidation seamless copper pipe as the piping.
◇
If use the lengthen piping needs welding:
Please welding before fasten the nut, when welding using nitrogen gas to replace the air
in the pipe in order to prevent oxidation.
◇
If there are many points to be welded when installing the lengthen piping, please set a
filter in the pipe(buy from local market)
◇
Please use nitrogen gas or air to remove the dust and water in the pipe,
◇
Please lay out the piping according to the tend towards of the piping, but it is not allowed
more than 3 times curved at the same point of the pipe(if do like this the pipe will become
rigid)
◇
Pipe bending machine is used during the process of bending the pipe, the curvature shall
not be too small or it will affect the refrigerant flow.
7.2 Specification of connection pipe
Cooling Capacity(KBtu/h) 12K 18K 24K 30K 36K 42K 48K 60K
Connection
Pipe (mm)
Liquid Pipe Φ6.35 Φ9.52
Gas Pipe Φ12.7 Φ15.88 Φ19.05
Max. Length 25 30 50 50 65 65 65 65
Max. Height (m) 10 20 25 25 30 30 30 30
Max. Bend Qty 5 5 5 8 10 10 10 10
7.3 Piping specification selection
As to the detail selection please take reference to the cooling capacity adjust index figure
during different installation situations.
Piping diameter
Tighten
torque
Expanding
size (A)
Expanding shape Paint the frozen
oil
1/4in(φ6.35mm) 15-19(N·m) 8.3-8.7mm
3/8in(φ9.52mm) 35-40(N·m)
12.0-12.4m
m
1/2in(φ12.7mm) 50-60(N·m)
15.4-15.8m
m
5/8in(φ15.88mm
)
62-76(N·m)
18.6-19.0m
m
3/4in(φ19.05mm
)
70-75(N·m)
22.9-23.3m
m