Figure - Daikin R-410A Installation Manual

EDUS39-605
with the provided insulation, to prevent it from coming into
contact with the casing.
Precautions when knocking out knockout holes:
Avoid damaging the casing
•
After knocking out the holes, prevent rusting by painting
•
the edges and surrounding areas with the repair paint.
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.
Knockout hole
1.
Drill
2.
Concave section
3.
2. Make sure to perform the piping installation within the
range of the maximum allowable pipe length, level differ-
ence, and total length after branching as indicated in Sec-
tion 6.3 Example of Connection.
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.
3. For installation of the refrigerant branching kit, refer to the
installation manual delivered with the kit. Mount the REF-
NET joint so that it branches either horizontally or verti-
cally.
Horizontal wires
1.
Up to ±30° or vertically. Mount the REFNET header
2.
so that it branches horizontally.
Horizontal wires
3.
4. Pipe Connection
Only use the flare nuts included with the unit. Using differ-
•
ent flare nuts may cause the refrigerant to leak.
Be sure to perform a nitrogen blow when brazing. Brazing
•
without performing nitrogen replacement or releasing nitro-
gen into the pipin creates large quantities of oxidized film
on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing
normal operation.Do not use flux when brazing the refrig-
erant pipe joints. Use phosphor copper brazing (B-Cu93P-
710/795: ISO 3677) which does not require flux.
Flux has an extremely negative effect on refrigerant piping
systems. For instance, if chlorine based flux is used, it will
cause pipe corrosion. Flux containing flourine damages
refrigerant oil.
DANGER
Use of oxygen can cause an explosion resulting in severe
•
injury or death. Only use nitrogen gas.
Refrigerant gas may produce toxic gas if it comes in con-
•
tact with fire such as from a fan, heater, stove or cooking
device. Exposure to this gas can cause severe injury or
death.
The pressure regulator for the nitrogen released when
•
doing the brazing should be set to 2.9 psi or less.
Refer to Figure 9.
Refrigerant piping
1.
Location to be brazed
2.
Installation of Outdoor Units
Nitrogen
3.
Taping
4.
Manual valve
5.
Regulator
6.
Nitrogen
7.
5. Protection against contamination when installing pipes
Take measures to prevent foreign materials like mois-
•
ture and contamination from mixing into the system
Place Installation period
More than a month
Outdoor
Less than a month
Indoor Regardless of the period
Use caution when passing copper tubes through walls.
•
Precautions when selecting branch piping.
If the piping between the outdoor units is 295 ft. or longer,
•
be sure to enlarge the main pipe in the liquid-side and gas-
side branch 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.
Outdoor unit
1.
Main pipe
2.
Enlarge
3.
The first refrigerant branching kit.
4.
Indoor unit
5.
RXYQ72MTJU.................... φ3/4"→φ7/8"
RXYQ96MTJU..................... φ7/8"→φ1"
RXYQ144MTJU ............. φ1-1/8"→φ1-1/4"
RXYQ168MTJU ............. φ1-1/8"→φ1−1/4"
RXYQ192MTJU ............. φ1-1/8"→φ1−1/4"
Precautions for installation of units:
The outdoor unit multi-connection piping kit is sold as a
•
separate option under Part Number BHFP22M90 and is
necessary for the installation of multiple outdoor units.
When installing, see the installation manual attached to the
kit and pay attention to installation restrictions described in
Connecting Refrigerant Piping.
Installation
.
Protection method
Pinch the pipe
Pinch or tape the pipe
GAS LIQUID
φ3/8"→φ1/2"
φ3/8"→φ1/2"
φ5/8"→φ3/4"
φ5/8"→φ3/4"
φ5/8"→φ3/4"
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