Daikin REYQ96MTJU Installation Manual page 10

Precautions when knocking out knockout holes
• Be sure to avoid damaging the casing
• After knocking out the holes, we recommend you paint the edges
and areas around the edges using the repair paint to prevent rusting.
• When passing electrical wiring through the knockout holes, wrap
the wiring with protective tape to prevent damage.
• Open knockout holes around the 4 concave knockout holes in the
base frame, using a φ1/4"-bit drill.
(Refer to figure 7)
1. knockout hole
2. Drill
3. Concave section
2.
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated in chapter "Example of
connection"
3.
For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
Mount the REFNET joint so that it branches either horizontally or
vertically.
(Refer to figure 8)
1. (Horizontal connections)
2. (Up to ±30° or vertically.)
Mount the REFNET header so that it branches horizontally.
3. (Horizontal connections)
4.
Pipe connection
• Only use the flare nuts included with the unit.
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
on the inside of the pipes, adversely affecting valves and com-
pressors in the refrigerating system and preventing normal oper-
ation.)
• Do not use a flux when brazing the refrigerant pipe joints.
Use phosphor copper brazing (B-Cu93P-710/795: ISO 3677)
which does not require flux.
(Using a chlorine flux may cause the pipes to corrode, and if it
contains fluoride it may cause the refrigerant lubricant to deterio-
rate, adversely affecting the refrigerant piping system.)
NOTE
• The pressure regulator for the nitrogen released when doing the
brazing should be set to 2.9 psi or less.
(Refer to figure 9)
1. Refrigerant piping
2. Location to be brazed
3. Nitrogen
4. Taping
5. Manual valve
6. Regulator
7. Nitrogen
5.
Protection against contamination when installing pipes
• Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
Place Installation period
More than a month
Outdoor
Less than a month
Indoor Regardless of the period
• Great caution is needed when passing copper tubes through
walls.
Precautions when selecting branch piping.
• If the piping between the outdoor unit and the first refrigerant branch-
ing kit is 295ft. or longer, be sure to enlarge the main pipe in the liq-
uid-side piping.
Do not enlarge the main pipe in the discharge-side and suction-side
piping.
Depending on the length of the refrigerant piping, the power may
drop, but even in such cases it is ok to enlarge the main pipe.
(Refer to figure 10)
1. Outdoor unit
2. Main pipe
3. Enlarge
4. The first refrigerant branching kit.
5. Indoor unit
6. BS unit
[Liquid side]
REYQ96MTJU ............................φ3/8"➔ φ1/2"
REYQ192MTJU ...........................φ5/8"➔ φ3/4"
10
Protection method
Pinch the pipe
Pinch or tape the pipe
〈 〈 〈 〈 Cautions for installation of multiple outdoor units〉 〉 〉 〉
1.
The piping between the outdoor units must be routed level or slightly
upward to avoid the risk of oil detention to the piping side.
Pattern 1
to indoor unit
Piping between outdoor units
to indoor unit
Pattern 2
to indoor unit
to indoor unit
Change to pattern 1 or pattern 2
Prohibited pattern
to indoor unit
to indoor unit
2.
To avoid the risk of oil retention to the stopping unit side, always con-
nect the stop valve and the piping between outdoor units as shown
in the figure A or figure B.
)
*
Piping between outdoor units
Downward inclination
Downward inclination
Oil remains in piping
)
*