Specifications

EDUS04-740 Installation Manual
Room Air Conditioners D-Series 57
1. Installing Outdoor Unit
1) When installing the outdoor unit, refer to “Precautions for Selecting the Location” and the “Outdoor Unit
Installation Drawings.”
2) If drain work is necessary, follow the procedures below.
2. Drain Work
1) Use drain plug for drainage.
2) If the drain port is covered by a mounting base or floor surface, place additional
foot bases of at least 1 1/4” in height under the outdoor unit’s feet.
3) In cold areas, do not use a drain hose with the outdoor unit.
(Otherwise, drain water may freeze, impairing heating performance.)
3. 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.
Outdoor Unit Installation
4. 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)
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.
Drain-water hole
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 16mm)
Coat here with refrigeration machine oil
Torque wrench
Piping union
Flare nut
Spanner
Service port cap tightening torque 7.9~10.8ft • Ibf
Warning
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
Flare nut tightening torque
Gas side Liquid side
1/2 inch
5/8 inch
1/4 inch
36.5~44.5ft • Ibf
45.6~55.6ft • Ibf
10.4~12.7ft • 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.
A 0 ~ 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