Specifications

EDUS04-740 Installation Manual
Room Air Conditioners D-Series 45
1. Flaring the Pipe End
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward
so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
2. Refrigerant Piping
1) Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with
the torque wrenches.
•
Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and escaping gas.
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare. (Use
refrigeration oil for R410A)
Coat here with refrigeration machine oil
To rque wrench
Piping union
Flare nut
Spanner
2-1. Caution on Piping Handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe
bender for bending.
(Bending radius should be 1 3/16 to 1 9/16in or larger.)
2-2. Selection of Copper and Heat Insulation materials
• When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052 W/mK (0.024-0.030 Btu/fthºF)
Refrigerant gas pipe’s surface temperature reaches 230ºF max.
Choose heat insulation materials that will withstand this
temperature.
2) Be sure to insulate both the gas and liquid piping and to provide
insulation dimensions as below.
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe thermal insulation
15/18 class
O.D. 1/2”
Thickness 1/32”
24 class
O.D. 5/8”
Thickness 1/20”
15/18/24 class
O.D. 1/4”
15/18 class
I.D. 1/2”-5/8”
24 class
I.D. 5/8”-2/3”
15/18/24 class
I.D. 1/3”-1/2”
Thickness 1/2” minimum
Thickness 1/32”
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the unit life.
3)
Never use piping which has been used for previous installations. Only use parts which are provided with the
unit.
4) Do never install a refrigerant drier to this unit.
5) The drying material may dissolve and damage the system.
6) Incomplete or improper flaring may cause refrigerant gas leakage.
Warning
Flare nut tightening torque
Gas side Liquid side
1/2 inch
5/8 inch
1/4 inch
36.5~44.5ft • bf
45.6~55.6ft • Ibf
10.4~12.7ft • Ibf
Service port cap tightening torque 7.9~10.8ft • Ibf
Valve cap tightening torque
Gas side Liquid side
1/2 inch
5/8 inch
1/4 inch
35.5~44.0ft • Ibf
32.5~39.7ft • Ibf
15.9~20.2ft • Ibf
(Cut exactly at
right angles.) Remove burrs
Set exactly at the position shown below.
A
Flaring
Die
Check
Flare’s inner
surface must
be flaw-free.
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
A0 ~ 0.020”
Clutch-type
Flare tool for R-410A
0.039 ~ 0.059”
Clutch-type (Rigid-type)
0.059 ~ 0.079”
Wing-nut type (Imperial-type)
Conventional flare tool
Refrigerant piping work