Refrigerant Piping Work; General Instructions; Connecting The Refrigerant Pipe - Daikin FHQ18PVJU Manuel D'installation

(5) When hanging the indoor unit main body, be sure to
use a level or a plastic tube with water in it to make sure
the drain piping is set either level or slightly tilted, in
order to ensure proper drainage. (Refer to Fig. 12)
A
B
1˚ or less
A.B
A.When the drain piping is tilted to the right, or to the right
and back.
Place it level, or tilt it slightly to the right or the back. (1° or less.)
B.When the drain piping is tilted to the left, or to the left and
back.
Place it level, or tilt it slightly to the left or the back. (1° or less.)
CAUTION
• Setting the unit at an angle opposite to the drain piping might
cause a water leakage.
6.

REFRIGERANT PIPING WORK

DANGER
• Refrigerant gas may produce toxic gas if it comes in contact
with fi re such as from a fan heater, stove or cooking device.
Exposure to this gas could cause severe injury or death.
CAUTION
• Use a pipe cutter and fl are suitable for the type of refrig-
erant.
• To prevent dust, moisture or other foreign matter from infi l-
trating the tube, either pinch the end or cover it with tape.
• Do not allow anything other than the designated refrig-
erant 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.
6-1

GENERAL INSTRUCTIONS

• For refrigerant pipe of outdoor units, see the installation
manual attached to the outdoor unit.
• Execute thermal insulation work completely on both
sides of the gas pipe and the liquid pipe.
Otherwise, a water leakage can result sometimes.
(The temperature of the gas pipe can reach up to
approximately 250ºF, so use insulation pipe cover
which is suffi ciently resistant.)
• Also, in cases where the temperature and humidity of
the refrigerant pipe sections might exceed 86ºF or RH
80%, reinforce the thermal insulation. (3/4 in. or thicker)
Condensate may form on the surface of the insulation
pipe cover.
English
1˚ or less
1˚ or less
Fig. 12
• Before refrigerant pipe work, check which type of refrig-
erant is used.
Proper operation is not possible if the types of refriger-
ant are not the same.
6-2

CONNECTING THE REFRIGERANT PIPE

• The outdoor unit is charged with refrigerant.
• Use copper alloy seamless pipes.
• 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. 13)
• Refer to "Table 2" to determine the proper tightening torque.
• Refer to "Table 2" for the dimensions of fl are shape.
• When connecting the fl are nut, coat the fl are section with
ester oil or ether oil, rotate three or four times fi rst, then
screw in. (Refer to Fig. 14)
Torque wrench
Flare nut
CAUTION
• Be careful for oil not to adhere to any portions other than a
fl are part. If oil adhere to resin parts etc., there is a possibil-
ity of damaging by deterioration.
Ester oil or ether oil.
NOTE
• Use the fl are nut included with the unit main body.
Table 2
Pipe size Tightening torque Flare dimensions A
(in.) (ft. lbf)
φ3/8
24.1-29.4 0.504-0.520
φ5/8
45.6-55.6 0.760-0.776
CAUTION
• Overtightening may damage the fl are and cause a refrigerant
leakage
Not recommended 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 installa-
tion method mentioned below.
When you keep on tightening the fl are nut with a spanner,
there is a point where the tightening torque suddenly
increases. From that position, further tighten the fl are nut
the angle shown below :
Pipe union
Spanner
Fig. 13
Fig. 14
Flare shape (in.)
(in.)
R0.016-0.031
7