RZQ71~125B7V3B
Split System air conditioners
4PW16864-1A
Installation manual
6
Existing or pre-installed piping can be used
1.
Piping must comply with the criteria below.
•
Pipe diameter must comply with the limitations as indicated in
paragraph
"Refrigerant pipe size" on page 5
.
•
Piping length must be within limits of the allowable piping length
as in paragraph
"Allowable pipe length and height difference" on
•
Piping must be designed for R-410A. See paragraph
.
2.
Piping can be reused without cleaning when:
•
Total 1-way piping length: <50 m.
•
No compressor breakdown has occured in the history of the unit
to be replaced.
•
A correct pump down operation can be executed:
-
Operate the unit continuously for 30 minutes in cooling
mode.
-
Execute a pump down operation.
-
Remove the airconditioning units to be replaced.
•
Check the contamination inside the existing piping.
If you cannot meet all these requirements, the existing pipes
must be cleaned after removing the airconditioning units to be
replaced.
3.
Prepare the flare connections for higher pressure. See paragraph
"Cautions for flare connection" on page 8
.
P
RECAUTIONS
ON
REFRIGERANT
PIPING
■
Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
■
Use R-410A only when adding refrigerant
Installation tools:
Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R-410A installations to
withstand the pressure and to prevent foreign materials (e.g.
mineral oils and moisture) from mixing into the system.
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 –100.7 kPa (5 Torr,
–755 mm Hg).
■
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Great caution is needed when passing copper tubes through
walls.
■
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. (Maximum inclination:
30° or less).
-
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
■
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 oxidized 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.
R
EFRIGERANT
P
IPING
■
Field pipes can be installed in four directions.
Figure - Field pipes in four directions
■
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.)
■
To install the connecting pipe to the unit in a downward direction,
make a knockout hole by penetrating the center area around the
knockout hole using a
Ø
6 mm drill. (See
■
After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.
Place
Installation period
Protection method
Outdoor unit
More than a month
Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor unit
Regardless of the
period
1
Drill
2
Center 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
4
4
3
2
1
7
8
9
10
A
D
C
B
5
6
