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3.3.3. Drilling holes for bolts and installing the bolts
• Using the installation template, drill holes for bolts (4 holes).
Installation template
A
3.3.4. Fix the unit
(1) Hang the unit
Nut A
(Locally purchased)
Washer
(Accessories)
Nut B
(Locally purchased)
Nut A
(Locally purchased)
Washer
(Accessories)
Nut B
(Locally purchased)
13/16 (20)
or less
If the length of hanger bolt is over 13/16 in (20 mm), it will be not convenient for following
works:
• The opening and closing of control box cover
• Replacement of drain pump
(2) Leveling
Base horizontal direction leveling on top of the unit.
3/8 in (10 mm) or less
GOOD
Drain hose
Give a slight tilt to the side to which the drain hose is connected. The tilt should be in the
range of 0 to 3/8 in (0 to 10 mm).
En-5
Drilling position
for bolts
Air
Unit: in (mm)
A
ARUL4
29-5/8 (752)
Hanger
Hanger bolt
Hanger bolt
Hanger
Unit
Unit: in (mm)
13/16 (20)
or less
Ceiling
Level
PROHIBITED
Air
GOOD
3/16 in (5 mm) or less
Leave a space of 3-15/16 in (100 mm) or more between the inlet port and the ceiling.
Fasten the unit securely with nuts A and B.
4. PIPE INSTALLATION
Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant R410A models. Also, when storing the piping, securely seal the openings by
pinching, taping, etc.
While welding the pipes, be sure to blow dry nitrogen gas through them.
4.1. Selecting the pipe material
Do not use existing pipes from another refrigeration system or refrigerant.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material : Phosphor deoxidized seamless copper pipes
It is desirable that the amount of residual oil is less than 0.04 oz/100 ft (40 mg/10 m).
Do not use copper pipes that have a collapsed, deformed, or discolored portion (es-
pecially on the interior surface). Otherwise, the expansion valve or capillary tube may
become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional (R22) refrigerant, it is necessary to
choose adequate materials.
• Thicknesses of copper pipes used with R410A are as shown in the table.
• Never use copper pipes thinner than those indicated in the table even if they are avail-
able on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
Level
PROHIBITED
CAUTION
CAUTION
CAUTION
Thickness [in (mm)]
0.032 (0.80)
0.032 (0.80)
0.032 (0.80)
0.039 (1.00)
0.039 (1.20)
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