Daikin RWEYQ72PCYD, Installation Manual

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12 English
(straight pipe) of 4-3/4 in. (120 mm) or more is connected to the joint.
Refer to figure 23 (Fig. C).
• Incorrect installation may cause breakage of outside unit.
(Refer to figure 23)
1. Caution nameplate
2. Horizontal line
3. Ground
4. Straight part of 19-11/16 in. (500 mm) or more
5. Local pipe
(4-3/4 in. (120 mm) length or more)
Precautions when selecting branch piping.
• If the overall equivalent length of piping between the outside units
and indoor units is 262.5 ft. (80 m) or more, be sure to enlarge the
main pipe in the liquid-side branch piping.
Depending on the length of the refrigerant piping, the cooling/heat-
ing capacity may drop, but even in such cases it is ok to enlarge the
main pipe.
(Refer to figure 21)
1. Outside unit
2. Main pipe
3. Enlarge
4. The first refrigerant branch kit.
5. Indoor unit
[Liquid side]
RWEYQ72/84P type:
...................................................φ
3/8”
→ φ
1/2”
RWEYQ144P type:
......................................................φ
1/2”
→ φ
5/8”
RWEYQ168/216P type:
...............................................φ
5/8”
→ φ
3/4”
RWEYQ252P type:
......................................................φ
3/4”
→ φ
7/8”
9-2 Protection against contamination when install-
ing pipes
• Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
• Great caution is needed when passing copper tubes through
walls.
9-3 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.
(Flux has an extremely negative effect on refrigerant piping sys-
tems. For instance, if chlorine based flux is used, it will cause pipe
corrosion. If the flux contains fluorine, it will damage the refriger-
ant oil.)
DANGER
• Use of oxygen could cause an explosion resulting in severe injury
or death. Only use nitrogen gas.
• Refrigerant gas may produce toxic gas if it comes in contact with fire
such as from a fan heater, stove or cooking device. Exposure to this
gas could cause severe injury or death.
NOTE
• The pressure regulator for the nitrogen released when doing the
brazing should be set to 2.9 psig (0.02 MPa) or less.
(Refer to figure 18)
1. Refrigerant piping
2. Location to be brazed
3. Nitrogen
4. Taping
5. Manual valve
6. Regulator
Precautions when connecting pipes
• See the following table for flare part machining dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside of
the flares and turn them three or four times at first.
(Use ester oil or ether oil.)
• See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, check the gas leak with
nitrogen.
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the unit
without a torque wrench, you may follow the installation method men-
tioned below.
After the work is finished, make sure to check that there is no gas
leak.
When you keep on tightening the flare nut with a spanner, there is a
point where the tightening torque suddenly increases. From that posi-
tion, further tighten the flare nut the angle shown below:
(Unit: in. (mm))
9-4 Connecting the refrigerant piping
Connect piping to outside unit by using accessory pipes
(Refer to figure 20)
1. Gas side piping
2. (field supply)
3. Gas side accessory pipe (for suction gas (1))
4. Liquid side pipe (field supply)
5. Flare nut (Included in the unit)
6. Accessory pipes (for discharge gas and suction gas (2))
is not used.
7. Piping on discharge gas side (field supply)
8. Piping on suction gas side (field supply)
9. Cut off the hatched area and use it as a cover for the drilled.
10. Hatched area
11. Accessory pipe (for discharge gas)
12. Accessory pipe (for suction gas)
13. Guideline for pipe machining
14. Accessory pipe (for suction gas (2))
15. Brazing
16. Accessory pipe (for suction gas (1))
17. Before fitting to the product, apply brazing.
NOTE
• Be sure to use the attached pipe when carrying out piping work in
the field.
• Be sure that the local piping does not touch other pipes, the bottom
panel or side panel. Especially for the bottom and side connection, be
sure to protect the local piping with the provided insulation, to prevent
it from coming into contact with the casing.
Precautions for installation of units
NOTE
• The outside unit multi connection piping kit that is sold separately as
an option (BHFP2 84U, BHFP2 84U) is neces-
sary for the multi installation of outside units.
• See the installation manual attached to the kit with attention to instal-
lation restrictions described in “connecting the refrigerant piping”
when installing.
Place Installation period Protection method
Outdoor
More than a month Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor Regardless of the period
pipe size
(in.)
tightening torque
(ft.·lbf. (N·m))
A
(in. (mm))
flare shape
(in. (mm))
φ
3/8
24.1 - 29.4
(32.7-39.9)
0.504 - 0.520
(12.8-13.2)
φ
1/2
36.5 - 44.5
(49.5-60.3)
0.638 - 0.654
(16.2-16.6)
φ
5/8
45.6 - 55.6
(61.8-75.4)
0.760 - 0.776
(19.3-19.7)
Pipe size Further tightening angle Recommended arm length of tool
φ
3/8 60 to 90 degrees Approx. 7-7/8 (200)
φ
1/2
30 to 60 degrees Approx. 9-13/16 (250)
φ
5/8 30 to 60 degrees Approx. 11-13/16 (300)
φ
3/4
20 to 35 degrees Approx. 17-3/4 (425)
R=0.016-0.031
(0.4-0.8)
45˚±2
90˚±2
A
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