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3.5. Installing the unit
Install the air conditioner in a location which can withstand a load of at least 5 times the
weight of the main unit and which will not amplify sound or vibration. If the installation loca-
tion is not strong enough, the indoor unit may fall and cause injuries.
Confirm the directions of the air intake and outlet before installing the unit.
The unit takes in air from the evaporator side, and expels it from the fan side.
3.5.1 Installation in an unconditioned space
The exterior cabinet of this unit has a greater risk of sweating when installed in an uncon-
ditioned space than when it is installed in the conditioned space. This is primarily due to
the temperature of the conditioned air moving through the indoor unit and the air circulating
around the unit where it is installed. For this reason, the following is recommended for all
indoor unit applications, but special attention should be paid to those installed in uncondi-
tioned spaces:
• Duct sizing and airflow are critical and must be based on the equipment selected.
• Supply and return duct attachment: If other than the factory flanges are used, the attach-
ment of ducting must be insulated and tight to prevent sweating.
• No perimeter supply flanges are provided. If a full perimeter supply duct is used, it is the
responsibility of the installer to provide duct flanges as needed, to secure and seal the sup-
ply duct to prevent air leakage and the sweating that will result.
• Apply caulking around all cabinet penetrations such as power wires, control wires, refriger-
ant tubing and condensate line where they enter the cabinet. Seal the power wires on the
inside where they exit conduit opening. Sealing is required to prevent air leakage into the
unit which can result in condensate forming inside the unit, control box, and on electrical
controls. Take care not to damage, remove or compress insulation when applying the caulk.
• In some cases, the entire indoor unit can be wrapped with insulation. This can be done as
long as the unit is completely enclosed in insulation, sealed and service access is provided
to prevent accumulation of moisture inside the insulation wrap.
• An auxiliary overflow pan is recommended to protect the structure from excessive cabinet
sweating or a restricted heat exchanger drain line.
• Apply caulking around all cabinet penetrations such as power wires, control wires, refriger-
ant tubing and condensate line where they enter the cabinet. Seal the power wires on the
inside where they exit conduit opening. Sealing is required to prevent air leakage into the
unit which can result in condensate forming inside the unit, control box, and on electrical
controls. Take care not to damage, remove or compress insulation when applying the caulk.
3.5.2 Closet Installation
Prior to installing the indoor unit make sure the holes are cut into the floor for the refrigerant
pipes, the drain line, the electrical wiring, the remote controller wiring.
(1) Remove the fan unit and control box access panel.
(2) Remove the heat exchanger access panel.
(3) Place the unit into position using one of the following choices:
A) If the Combustible Floor Base is used you slide the unit on to the combustible floor
base until the unit is touching the flanges on the back of the floor base.
B) If the Combustible Floor Base is not used you slide the unit over the duct opening
until the opening in the unit lines up with the duct opening in the floor.
(4) Secure the unit by one of the two choices:
A) If the Combustible Floor Base is used you secure the furnace to the floor by drilling
two holes through the furnace base and the floor base at the right and left front inside
corners of the cabinet. Use two screws to secure the furnace to the floor.
B) If the Combustible Floor Base is not used you secure the unit to the floor by drilling
two holes through the furnace base at the left and right front inside corners of the
cabinet. Use two screws to secure the unit to the floor.
(5) Use calking, sealers, and/or tape to seal between the combustible floor base and the
opening on the unit or between the opening on the unit and the duct in the floor.
3.5.3 Installation on combustible fl ooring
WARNING
Combustible Floor Base MUST BE
USED when the unit is being installed on
combustible flooring. The unit cannot be
installed on carpeting.
Failure to use the combustible floor base
combustible flooring or installing the unit
on carpeting could result in a fire causing
personnel injury, property damage or loss
of life.
Before installing the combustible floor base
make sure that there is a minimum of R-2.1
insulation between the sheet metal and
any wood or combustible flooring. Refer to
following figure for typical combustible floor
base installation.
En-9
WARNING
CAUTION
Installation example (locally purchased)
Floor base
Fold over
tabs
Duct con-
nector
Main trunk
11 in × 12 in
Duct cutout
14-1/8 in × 14-1/8 in
Floor cutout
3.5.4 Mounting the duct
To prevent people from touching the parts inside the unit, be sure to install grilles on the
inlet and outlet ports. The grilles must be designed in such a way that cannot be removed
without tools.
The external static pressure is as follows.
AR12/18/24/30/36/48/60TLAV: 0.1 to 0.8 in WG (25 to 200 Pa)
If an intake duct is installed, take care not to damage the temperature sensor (the tempera-
ture sensor is attached to the intake port flange).
Be sure to install the air filter in the air inlet. If the air filter is not installed, the heat ex-
changer may be clogged and its performance may decrease.
Placing unit in duct work
• Utilize flexible transitions on supply and return connections to reduce noise and vibration
transmission to the structure.
• When the connecting return air duct is smaller than the heat exchanger inlet opening,
construct the transition piece so that the vertical and horizontal dimensions of the transition
piece do not increase more then one inch for every seven inches of length of the transition
piece.
• Provide at least three feet of straight duct work preceding the unit inlet.
Duct insulation and vapor proofing:
• Properly select and install duct insulation as required by the application.
• All externally insulated duct work must have an adequate vapor seal for summer operation.
This is particularly important where the duct is exposed to highly humid conditions in such
places as attics, vented crawl spaces, unconditioned basements, and utility rooms. The
vapor seal prevents condensation of moisture in the insulating material and subsequent
loss of its insulating value.
3.5.5 Auxiliary overfl ow pan
In compliance with recognized codes, an auxiliary overflow pan must installed under all
equipment containing heat exchanger that are located in any area of a structure where
damage to the building or building contents may occur as a result of an overflow of the heat
exchanger drain pan or a stoppage in the primary condensate drain piping.
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 (especially
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 available
on the market.
Thicknesses of
Pipe outside diameter [in (mm)]
annealed copper
pipes (R410A)
CAUTION
CAUTION
CAUTION
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)
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