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5. CAUTIONS ON INSTALLATION

• Before installation, confirm the strength and levelness of the founda-

tion so that vibrations and noise are not generated.

• Fix the outdoor unit securely on a rigid base with foundation bolts as

shown in the foundation drawing below.
(Prepare 4 sets of commercially available M12-type or equivalent
foundation bolts, nuts and washers.)

• Use resin washers to prevent the paint from being scratched off and

rusting.

• The foundation bolts should be protruded by 15/16 in..

(Refer to figure)

〈〈

Drain treatment

〉〉

• In a location where drain from the outdoor unit may cause troubles

(for example, where drainage may splash on general passersby),
perform the drain piping work using the drain plug (optional).

• For drain treatment, space of at least 4 in. is required under the bot-

tom frame of the outdoor unit.

• In the drain piping work, make sure that drainage is discharged

securely.
(When routing the piping downward, check for water leakage.)

• Transport fittings (YELLOW ones in two positions) are provided on

the leg of the compressor for protecting the unit during transport.
Remove them as described below.

(1) Open the noise-proof cover as shown in the figure above.

At this time, do not pull the noise-proof cover, and do not remove it
from the compressor.

(2) Slightly loosen each fixing nut.
(3) Remove each transport fitting as shown in the figure above.
(4) Tighten each fixing nut again.
(5) Close the noise-proof cover to achieve the former status.

CAUTION

• If the unit is operated with the transport fittings attached, abnormal

vibration or sound may be generated.

6. REFRIGERANT PIPING WORK

CAUTION

<To piping technician>

•

Make sure to open the stop valves after finishing the piping
work. (Refer to the table shown in “ 6-7 Additional refrigerant
charge”.)
(Operating the air conditioner with the stop valve shut may
damage the compressor.)

• Use R410A to add refrigerant. (The R410A refrigerant cylinder has a

pink stripe painted around it.)
All field piping must be installed by a licensed refrigeration technician
and must comply with relevant local and national regulations.

•

BRAZING REFRIGERANT PIPING

Do not use flux when brazing copper-to copper refrigerant piping.
(Particularly for the HFC refrigerant piping) Therefore, use the phosphor
copper brazing filler metal (BCuP) which does not require flux.
(Flux has an extremely negative effect on refrigerant piping systems.
For instance, if chlorine based flux is used, it will cause pipe corro-
sion. Flux containing fluorine will damage refrigerant oil.)

NOTE

• Maximum piping length between the outdoor and indoor unit is 230ft.
• Installation tools:

Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to withstand
the pressure and to prevent foreign materials (e.g. mineral oils such
as SUNISO and moisture) from mixing into the system.
(The screw specifications differ for R410A and R407C.)
Vacuum pump (use a 2-stage vacuum pump with a non-return valve):

Make sure the pump oil does not flow oppositely into the system
while the pump is not working.

Use a vacuum pump which can evacuate to –14.6 psi.

6-1 Selection of piping material
1.

Foreign materials inside pipes (including oils for fabrication) must be
9mg/10ft. or less.

Use the following material specification for refrigerant pipping:
• construction material: Phosphoric acid deoxidized seamless cop-

per for refrigerant.

• size: Determine the proper size referring to chapter “Example of

connection”.

6-2 Protection of piping

• Protect the pipings to prevent moisture and dusts from coming into

the pipings.

• Especially, pay attention when passing the pipings through a hole or

connecting the end of piping to the outdoor.

6-3 Piping connection

•

For handling of stop valves, refer to “Stop valve operation
method” in “6-7 Additional refrigerant charge”.

•

Only use the flare nuts attached to the stop valves.
Using different flare nuts may cause the refrigerant to leak.

•

Be sure to perform a nitrogen blow when brazing.

(Brazing without performing nitrogen replacement or releasing nitrogen
into the piping will create large quantities of oxidized film inside the
pipes, adversely affecting valves and compressor in the refrigerating
system and preventing normal operation.)

DANGER

• Use of oxygen could cause an explosion resulting in severe injury or

death. Only use nitrogen gas.

• Refrigerant gas may produce toxic gas if it comes in contact with fire

such as from a fan heater, stove or cooking device. Exposure to this
gas could cause severe injury or death.

Transport fitting removal procedure

15/16

Resin

washer

5 1/2

1 3/4

5 1/2