En-6
• Remove the screws, and
then remove cover and
fan guard.
• Install the cover with the
screws as shown in the
following figure.
Model Screw
AR7/9/12/14 9
AR18 11
Cover
Fan guard
screw
3.5.2. Install the filter
• Install the filters (accessories) to the unit.
Filter
Unit
Filter
3.5.3. Fix the unit
(1) Fixing method of the unit
• To prevent overturning, fix the unit to the floor or the wall.
• To avoid the vibration of the unit, insert the spacer between the unit and the floor or the
wall, and fix it.
(2) Leveling
Base horizontal direction leveling on top of the unit.
Level
3/8 (10) or less
PROHIBITED
GOOD
Level
PROHIBITED
GOOD
3/8 (10) or less
Unit: in (mm)
CAUTION
Fasten the unit securely with Special nuts A and B.
4. PIPE INSTALLATION
CAUTION
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
CAUTION
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 0.004 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)] Thickness [in (mm)]
1/4 (6.35) 0.032 (0.80)
3/8 (9.52) 0.032 (0.80)
1/2 (12.70) 0.032 (0.80)
5/8 (15.88) 0.039 (1.00)
3/4 (19.05) 0.047 (1.20)
9374342556-02_IM.indb 6 27-Sep-19 10:29:59 AM
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