Drain Work (Only For Heat Pump Models); Flaring The Pipe End; Refrigerant Piping - Daikin RX09NMVJU Installation Manual

2.
Drain work
(only for heat pump models)
• If the drain port is covered by a mounting base or floor
surface, place additional foot bases of at least 1-1/4
inch (30mm) in height under the outdoor unit's feet.
• In cold areas, do not use a drain socket, drain
caps (1,2) and a drain hose with the outdoor unit.
(Otherwise, the drain water may freeze, impairing
heating performance.)
1) Attach C drain cap (1) and
2) Attach B drain socket.
3.

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
4.

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent cracking of the flare nut as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with a spanner and a
torque wrench.
Flare nut tightening torque
Gas side
3/8 inch (9.5mm) 1/2 inch(12.7mm)
24-1/8 – 29-1/2ft • Ibf 36-1/2 – 44-1/2ft • lbf
(32.7-39.9N • m) (49.5-60.3N • m)
Width across flats 11/16 inch(17mm) 3/4 inch(19mm)
Valve cap
10-1/2–12-5/8ft • lbf 12-5/8–15-3/8ft • lbf
tightening torque (14.2-17.2N • m) (17.1-20.9N • m)
Service port cap tightening torque
8 – 10-7/8ft • lbf (10.8-14.7N • m)
■
English
D drain cap (2).
Liquid side
5/8 inch(15.9mm) 1/4 inch (6.4mm)
45-5/8 – 55-5/8ft • lbf
10-1/2 – 12-3/4ft • lbf
(61.8-75.4N • m)
(14.2-17.2 N • m)
7/8 inch(22mm) 1-1/16 inch(27mm)
16 – 20-1/4ft • lbf 35-3/8–44-1/8ft • lbf
(21.6-27.4N • m) (48-59.8N • m)
09/12 class
Drain cap (1)
C
Drain cap (2)
D
Drain cap (1)
C
Drain
B
Air outlet side
socket
Bottom frame
Drain cap
Pinch the bottom
frame in.
Cut exactly at
Remove burrs.
right angles.
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
0-0.020 inch
Die A
(0-0.5mm)
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.
18/24 class
Drain cap (1)
C
Drain cap (2)
D
B Drain
D
socket
Air outlet side
Bottom frame
Drain socket
B
Hose (available commercially,
inner dia. 5/8 " (16mm))
Check
The pipe end must
Flare's inner be evenly flared in
a perfect circle.
surface must
be flaw-free.
Make sure that the
flare nut is fitted.
Flaring
Conventional flare tool
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
0.039-0.059 inch 0.059-0.079 inch
(1.0-1.5mm) (1.5-2.0mm)
Apply oil
Apply refrigeration oil to
the inner surface of the
flare.
Drain cap (2)
6