12
Connecting the refrigerant pipe
When installing, make sure there is no leakage. When recovering the refrigerant, ground the compressor first before
removing the connection pipe. If the refrigerant pipe is not properly connected and the compressor works with the
service valve open, the pipe inhales the air and it makes the pressure inside of the refrigerant cycle abnormally high.
It may cause explosion and injury.
There are two refrigerant pipes of differing diameters:
f
f
A smaller one for the liquid refrigerant
f
f
A larger one for the gas refrigerant
f
f
The inside of copper pipe must be clean & has no dust
1. Remove the pinch pipe on the pipes and connect the assembly pipes to each
pipe, tightening the nuts, first manually and then with a torque wrench, a
spanner applying the following torque.
Outer Diameter
Thickness
N.m
Torque (kgf•cm)
ø6.35 mm(1/4")
0.8 mm(0.03")
14~18
140~180
ø9.52 mm(3/8")
0.8 mm(0.03")
34~42
350~430
ø12.70 mm(1/2")
0.8 mm(0.03")
49~61
500~620
ø15.88 mm(5/8")
0.8 mm(0.03")
68~82
690~830
If the pipes must be shortened refer to page 13.
Refrigerant oil
Spanner
Union
Torque wrench
Flare nut
2. Must use insulator which is thick enough to cover the refrigerant pipe to
protect the condensate water on the outside of pipe falling onto the floor and
the efficiency of the unit will be better.
3. Cut off any excess foam insulation.
4. Be sure that there must be no crack or wave on the bended area.
5. It would be necessary to double the insulation thickness[10mm(0.39") or
more] to prevent condensation even on the insulator when if the installed
area is warm and humid.
Clamp
Insulation
refrigerant pipe
Insulation
refrigerant pipe
Liquid refrigerant pipe
Gas
refrigerant
pipe
❈
The designs and shape are subject to
change according to the model.
• Connect the indoor and outdoor units using pipes with flared connections(not supplied). For the lines, use
insulated, unwelded, degreased and deoxidized copper pipe,(Cu DHP type to ISO 1337), suitable for operating
pressures of at least 4200kPa and for a burst pressure of at least 20700kPa. Copper pipe for hydro-sanitary
applications is completely unsuitable.
• For sizing and limits (height difference, line length,max.bends, refrigerant charge, etc.)see the outdoor unit
installation manual.
• All refrigerant connection must be accessible, in order to permit either unit maintenance or removing it completely.
WARNING
NOTE
CAUTION
FJM IDU-PH_Cassette type_IM_31595A-04_EN.indd 12
2015-11-16 오후 4:52:21
