Daikin RZQ71D3V1B Installation Manual Download Page 10

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Installation manual

RZQ7 RZQ100~14 RZQ100~140B9W1B

Split System air conditioners

4PW60930-1

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In case of simultaneous operating system
-

Upward and downward piping should be performed at the
main piping line.

Use branch piping kit (optional) for branching refrigerant
pipes.

Precautions to be taken. (For details, refer to the manual attached to
branch piping kit.)

Install the branch pipes horizontally (with a maximum
inclination of 15°) or vertically.

Length of branch pipe to the indoor unit should be as short as
possible.

Try to keep lengths of both branch pipes to the indoor unit
equal.

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When using existing refrigerant piping
Pay attention to the following points when using existing
refrigerant piping

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Perform a visual check on quality of residual oil in existing
refrigerant piping.
This check is extremely important because using existing
piping with deteriorated oil will cause compressor
breakdown.
- Put some residual oil of the pipes you want to reuse on a

piece of white paper or on the white surface of an oil
checking reference card and compare that oil colour with
the circled colour of the oil checking reference card.

- If oil colour is identical to the circled colour or darker,

replace the piping, install new piping or clean the piping
thoroughly.

- If oil colour is lighter, the pipes can be reused without

cleaning.

An oil checking reference card is indispensable for such
evaluation and can be obtained at your dealer.

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In the following situations, the existing piping should not be
re-used and new piping should be installed.
- If the previously used model had problems with its

compressor (this might cause oxidised coolant oil, scale
residue and other adverse effects).

- If the indoor or outdoor units were disconnected from the

piping for a long period of time (water or dirt might have
gotten into the piping).

- If copper piping is corroded.

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Flares should not be re-used but rather new ones made in
order to prevent leaks.

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Check welded connections for gas leaks, if the local piping
has welded connections.

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Replace deteriorated insulation with new material.

EFRIGERANT

PIPING

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Field pipes can be installed in four directions.

Figure - Field pipes in four directions

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Cutting out the two slits makes it possible to install as shown in
the

figure "Field pipes in four directions"

(Use a metal saw to cut out the slits.)

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To install the connecting pipe to the unit in a downward direction,
make a knockout hole by penetrating the centre area around the
knockout hole using a

6 mm drill. (See

figure "Field pipes in

four directions"

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After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.

Preventing foreign objects from entering

Plug the pipe through-holes with putty or insulating material
(procured locally) to stop up all gaps, as shown in the figure.

Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.

Cautions for handling stop valve

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The stop valves for indoor-outdoor connecting piping are closed
at shipment from the factory.

The names of parts of the stop valve are shown in the figure.