Specifications

Installation Manual EDUS04-740
50 Room Air Conditioners D-Series
Outdoor Unit Installation
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 (Heat pump-Models)
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.)
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
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.
(Cut exactly at
right angles.) Remove burrs
Set exactly at the position shown below.
A
Flaring
Die
A 0 ~ 0.020”
Clutch-type
Flare tool for R410A
0.039 ~ 0.059”
Clutch-type (Rigid-type)
0.059 ~ 0.079”
Wing-nut type (Imperial-type)
Conventional flare tool
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.
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/4 inch
24.1~29.4ft • Ibf 10.4~12.7ft • Ibf
Valve cap tightening torque
Gas side Liquid side
3/8 inch 1/4 inch
15.9~20.2ft • Ibf 15.9~20.2ft • Ibf
Service port cap
7.9~10.8ft • Ibf
tightening torque
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.
Warning