Refrigerant Piping - Daikin RZQ-BW1 Installation Manual

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

refrigerant piping

Perform a visual check on quality of residual oil in existing
refrigerant piping.
This check is extremely important because using existing
piping with deteriorated
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.
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.
Flares should not be re-used but rather new ones made in
order to prevent leaks.
Check welded connections for gas leaks, if the local piping
has welded connections.
Replace deteriorated insulation with new material.
Installation manual
7
oil will cause compressor
R
EFRIGERANT PIPING
Field pipes can be installed in four directions.
1 2 3
4 4
Figure - Field pipes in four directions
1 Drill
2 Centre area around knockout hole
3 Knockout hole
4 Slit
5 Connecting pipe
6 Bottom frame
7 Front plate
8 Pipe outlet plate
9 Screw front plate
10 Pipe outlet plate screw
A Forward
B Backward
C Sideways
D Downward
Cutting out the two slits makes it possible to install as shown in
the figure "Field pipes in four
(Use a metal saw to cut out the slits.)
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
Ø
four directions".)
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.
1
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.
Cautions for handling stop valve
The stop valves for indoor-outdoor connecting piping are closed
at shipment from the factory.
Make sure to keep the valve open during operation.
The names of parts of the stop valve are shown in the figure.
1
2
3
4
7
9
10
5 6
A
D
directions".
6 mm drill. (See figure "Field pipes in
1 Putty or insulating material
(produced locally)
1 Service port
2 stop valve
3 Field piping connection
4 Valve cover
RZQ71~140C7V1B + RZQ100~140B8W1B
Split System air conditioners
4PW40417-1
8
B
C