Cairox AOYG-KQTA Installation Manual Download Page 7

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3.4. Drain installation

CAUTION

• Perform drain work in accordance with this Manual, and ensure that the drain water

is properly drained. If the drain work is not carried out correctly, water may drip down
from the unit, wetting the furniture.

• When the outdoor temperature is 0 °C or less, do not use the accessory drain pipe.

If the drain pipe is used, the drain water in the pipe may freeze in extremely cold
weather.

• If you are installing the drain pipe and drain caps,

please provide a working space under the base of
the outdoor unit.

• As the drain water

ows out of the outdoor unit

during heating operation, install the drain pipe and
connect it to a commercial 16 mm hose. (Reverse
cycle model only)

• When installing the drain pipe, plug all the holes

other than the drain pipe mounting hole in the
bottom of the outdoor unit with putty so there is no
water leakage. (Reverse cycle model only)

Drain pipe mounting hole

Base of the outdoor unit

Drain pipe

(Unit : mm)

270

265

170

352

267

680

Drain cap mounting hole ×3

Drain pipe mounting
hole ×1

AIR

3.5. Pipe installation

3.5.1. Opening a knock out hole

CAUTION

• Be careful not to deform or scratch the panel while opening the knock out holes.
• To protect the piping insulation after opening a knock out hole, remove any burrs

from the edge of the hole. It is recommended to apply rust prevention paint to the
edge of the hole.

• Pipes can be connected from 4 directions, front, lateral side, rear side and bottom.

(Fig. A)

• When connecting at the bottom, remove the service panel and piping cover on the

front of the outdoor unit, and open the knock out hole provided at the bottom corner
of the piping outlet.

• It can be installed as shown on “Fig. B” cutting out the 2 slits as indicated on “Fig. C”.

(When cutting slits, use a steel saw.)

Fig.

Service cover

Front

connection

Bottom

connection

Lateral

connection

Rear

connection

Bottom
connection

Slit

Fig. B

Fig. C

3.5.2. Pipe connection



Brazing

CAUTION

• If air or another type of refrigerant enters the refrigeration cycle, the internal

pressure in the refrigeration cycle will become abnormally high and prevent the unit
from exerting its full performance.

• Apply nitrogen gas while brazing the pipes. If a pipe is brazed without applying

nitrogen gas, an oxidation

lm will be created.

This can degrade performance or damage the parts
in the unit (such as the compressor or valves).
Nitrogen gas pressure: 0.02 MPa
(= pressure felt suf

ciently on the back of the hand)

• For brazing material, use phosphor copper

that does not require

ux. Do not use

ux to

braze pipes. If the

ux is the chlorine type, it will

cause the pipes to corrode.
Furthermore, if the

ux contains

uoride, it will adversely affect the refrigerant pipe

system such as by degrading the refrigerant.
If

uoride is contained, quality of refrigerant deteriorates and affects the refrigerant

piping system.



Flaring

CAUTION

Do not use mineral oil on a

ared part. Prevent mineral oil from getting into the system

as this would reduce the lifetime of the units.

• Use special pipe cutter and

are tool exclusive for R410A.

(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings will not enter the pipe and remove any

burrs.

(3) Insert the

are nut (always use the

are nut attached to the indoor and outdoor

units respectively) onto the pipe and perform the

are processing with a

are tool.

Leakage of refrigerant may result if other

are nuts are used.

(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from

entering the pipes.

Check if [L] is