Daikin FVA71AMVEB Installation Manual page 12

• The outdoor unit is charged with refrigerant.
• The refrigerant piping can be taken out from the following side of the unit.
Left side, Right side, Back side, Bottom side
You must decide from which side you intend to take out the refrigerant piping.
• Be sure to use both a spanner and a torque wrench together as shown in the drawing, when connecting or
disconnecting pipes to/from the unit. (Refer to Fig. 9)
* Using a tool other than a spanner can damage the head of the flare nut, and gas leakage can occur due
to tightening failure.
• When connecting the flare nut, apply ester oil or ether oil to the inside of flared section, and turn the nut spin
3-4 times by hand before screwing in. (Refer to Fig. 10)
Torque wrench
Spanner
Pipe union
Flare nut
CAUTION
Be careful not to damage the flare section.
20, 25, 35 class
50, 60 class
3/8 inch 1/2 inch
32.7-39.9N • m
49.5-60.3N • m
(330-407kgf • cm) (505-615kgf • cm)
Caution on piping handling
1. Protect the open end of the pipe against dust and moisture.
2. All pipe bends should be as gentle as possible. Use a pipe bender for bending.
CAUTION
Overtightening may damage the flare and cause a refrigerant leakage.
When you do not have a torque wrench, use Table 2 as a rule of thumb.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque
suddenly increases.
From that point, further tighten and turn the flare nut the angle shown below. (Refer to Table 2)
After the work is finished, make sure to check that there is no leak.
Unless you tighten as instructed, (if it is loosely tightened), it may lead to the refrigerant leakage (slow
leak) and cause malfunction of the device (such as insufficient cooling or heating).
Table 2
Pipe size
Ø9.5 (3/8")
Ø15.9 (5/8")
10
Fig. 9
Flare nut tightening torque
Gas side
71 R410A class 71 R32 class
1/2 inch 5/8 inch
49.5-60.3N • m 61.8-75.4N • m
(505-615kgf • cm) (630-770 kgf • cm)
Further tightening angle
60 to 90 degrees
30 to 60 degrees
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Liquid side
Rain
1/4 inch
14.2-17.2N • m
(144-175kgf • cm)
Recommended arm length of tool
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Fig. 10
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Approx. 200mm
Approx. 300mm
Wall
English