Indoor Unit Installation; Refrigerant Piping Work - Daikin FXDQ20NVE Installation Manual

(3)
Main unit
Force
Filter
Force
In case of bottom side
5.

INDOOR UNIT INSTALLATION

〈〈 〈〈 〈〈 〈〈As for the parts to be used for installation work, be sure to
use the provided accessories and specified parts desig-
nated by our company.〉〉 〉〉 〉〉 〉〉
(1) Install the indoor unit temporarily.
• Attach the hanger bracket to the suspension bolt. Be sure
to fix it securely by using a nut and washer from the upper
and lower sides of the hanger bracket. (Refer to Fig. 5)
[ Securing the hanger bracket ]
Part to be procured
in the field
Washer for
hanging bracket (8)
(accessory)
Hanger
bracket
Tighten
(double nut)
Fig. 5
[ PRECAUTION ]
Since the unit uses a plastic drain pan, prevent welding
spatter and other foreign substances from the air outlet
during installation.
(2) Adjust the height of the unit.
(3) Check the unit is level.
CAUTION
• Make sure the unit is installed level using a level or a
plastic tube filled with water. (One thing to watch out for
in particular is if the unit is installed so that the slope is
not in the direction of the drain piping, this might cause
leaking.)
Level
(4) Tighten the upper nut.
English
Attach the filter to the
main unit while pushing
down on the bends.
In case of back side
[ How to secure washers ]
Insert below washer
Washer fixing plate (11)
(accessory)
Vinyl tube
6.

REFRIGERANT PIPING WORK

〈 〈 〈 〈 For refrigerant piping of outdoor units, see the installation
manual attached to the outdoor unit.〉 〉 〉 〉
〈 〈 〈 〈 Execute heat insulation work completely on both sides of
the gas piping and the liquid piping. Otherwise, a water
leakage can result sometimes.
Use insulation that can withstand temperatures of at least
120°C. Reinforce the insulation on the refrigerant piping
according to the installation environment. If it is not reinforced,
condensation may form on the surface of the insulation.〉 〉 〉 〉
CAUTION
Follow the points at below.
• Use a pipe cutter and flare suitable for the type of refrigerant.
• Apply ester oil or ether oil to the flare section when using a
flare connection.
• Only use the flare nuts included with the unit. Using different
flare nuts may cause the refrigerant to leak.
• To prevent dust, moisture or other foreign matter from infil-
trating the piping, either pinch the end or cover it with tape.
• Do not allow anything other than the designated refrigerant
to get mixed into the refrigerant circuit, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
(1) Connect the piping.
• The outdoor unit is charged with refrigerant.
• Be sure to use both a spanner and torque wrench together,
as shown in the drawing, when connecting or disconnecting
pipes to/from the unit. (Refer to Fig. 6)
Torque wrench
Spanner
Flare nut
Piping union
Fig. 6
• Refer to the Table 1 for the dimensions of flare nut spaces.
• Apply ester oil or ether oil to flare section (both inside and
out) when using flare nut connections and then turn 3 or 4
times by hand. (Refer to Fig. 7)
• Refer to Table 1 for tightening torque.
Table 1
Pipe
Tightening torque
size
φ 6.4
14.2 – 17.2 N·m
(1/4")
φ 9.5
32.7 – 39.9 N·m
(3/8")
φ 12.7
49.5 – 60.3 N·m
(1/2")
φ 15.9
61.8 – 75.4 N·m
(5/8")
CAUTION
Overtightening may damage the flare and cause leaks.
• Refer to Table 2 if no torque wrench is available.
Using a wrench to tighten flare nuts causes the tightening
torque to suddenly grow much tighter after a certain point.
From there, tighten the nut further by the appropriate angle
listed in Table 2.
(2) After the work is finished, make sure to check that
there is no gas leak.
Ester oil or ether oil
Fig. 7
Flare dimen-
Flare shape
sion A (mm)
8.7 – 9.1
12.8 – 13.2
R0.4-0.8
16.2 – 16.6
19.3 – 19.7
5