Drain Work; Models, Excluding Rxl Models); Flaring The Pipe End; Refrigerant Piping - Daikin FTX-N/U Manual

FTX-N/U, FVXS-N, FDMQ-R Series
2.
Drain work (only for heat pump

models, excluding RXL models)

CAUTION
In cold areas, do not use a drain socket, drain caps (1,2)
and a drain hose with the outdoor unit. (Drain water may
freeze, impairing heating performance.)
• 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.
1) Attach
2) Attach
• When attaching
frame, make sure to connect the drain hose to the
drain socket first.
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 filings do not enter the
pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring has been done correctly.
WARNING
• Do not apply mineral oil to the flare.
• Prevent mineral oil from getting into the system as this would reduce the service life of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with this unit.
• Never install a dryer to this R410A unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Incomplete flaring may result in refrigerant gas leakage.
4.

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking 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.
3/8 inch (9.5mm)
24-1/8 – 29-1/2ft • Ibf
(32.7-39.9N • m)
Width across flats 11/16 inch(17mm)
Valve cap 10-1/2 – 12-5/8ft • lbf
tightening torque (14.2-17.2N • m)
01_EN_3P379970-10C.indd 6
drain cap (1) and drain cap (2).
C D
B drain socket.
drain socket to the bottom
B
Flare nut tightening torque
Gas side
1/2 inch(12.7mm) 5/8 inch(15.9mm)
36-1/2 – 44-1/2ft • lbf 45-5/8 – 55-5/8ft • lbf
(49.5-60.3N • m) (61.8-75.4N • m)
3/4 inch(19mm) 7/8 inch(22mm)
12-5/8 – 15-3/8ft • lbf 16 – 20-1/4ft • lbf
(17.1-20.9N • m) (21.6-27.4N • m)
Service port cap tightening torque
8 – 10-7/8ft • lbf (10.8-14.7N • m)
09/12 class
Drain cap (1)
C
D Drain cap (2)
Drain cap (1)
C
B Drain
Air outlet side
socket
Bottom frame
Drain cap
Pinch the bottom
frame in.
Cut exactly at
right angles. Remove burrs.
Flaring
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
0-0.020 inch
Die
A
(0-0.5mm)
Liquid side
1/4 inch (6.4mm)
Do not apply refrigeration
oil to the outer surface.
10-1/2 – 12-3/4ft • lbf
(14.2-17.2 N • m)
Flare nut
1-1/16 inch(27mm)
35-3/8 – 44-1/8ft • lbf
(48-59.8N • m)
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
171
15/18/24 class
C Drain cap (1)
D Drain cap (2)
B Drain
Drain cap (2)
socket D
Air outlet side
Bottom frame
Drain socket
B
Hose (available commercially,
inner dia. 5/8 " (16mm))
Check
The pipe end must
The flare's be evenly flared in
inner surface a perfect circle.
must be
Make sure that the
flaw-free.
flare nut is fitted.
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.
3P379970-10C
10/18/2019 9:18:00 AM
EDUS091558E
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