Refrigerant Piping Work - Daikin FUY71FJV1 Installation Manual

6.

REFRIGERANT PIPING WORK

〈For refrigerant piping of outdoor units, see the installa-
tion 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.〉
(When using a heat pump, the temperature of the gas piping
can reach up to approximately 120°C, so use insulation which
is sufficiently resistant.)
〈Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30°C or RH80 %,
reinforce the refrigerant insulation. (20 mm or thicker)
Condensation may form on the surface of the insulating
material.〉
〈Before refrigerant piping work, check which type of refrig-
erant is used. Proper operation is not possible if the types
of refrigerant are not the same.〉
CAUTION
• Use a pipe cutter and flare suitable for the type of refrig-
erant.
• Apply ester oil or ether oil around the flare section
before connecting.
• To prevent dust, moisuture or other foreign matter from
infiltrating 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 Refrigerant pipes can be run in 3 directions
(Refer to Fig. 20)
Upward running pipes
Rear running pipes
Right running pipes
Fig. 20
• Use copper alloy seamless pipes (ISO 1337).
• The outdoor unit is charged with refrigerant.
• Be sure to use both a spanner and torque wrench
together, when connecting or disconnecting pipes to/
from the unit. (Refer to Fig. 21)
• Refer to the Table 2 for flare dimensions and tightening
torque.
Torque wrench
Spanner
Piping union
NOTE
• Use the flare nut included with the unit main body.
English
Flare nut
Fig. 21
• When connecting the flare nut, apply ester oil or ether
oil to the inside of the flare section, and spin 3-4 times
before screwing in. (Refer to Fig. 22)
Coat here with ester or ether oil.
CAUTION
Do not let oil get on the screw holders on the dressing board.
Oil can weaken the screw holders.
Table 2
Flare dimensions A (mm)
Type of refrigerant
R22, R407C
Applicable model
FUY-FJV1
FUYP-BV1
Pipe size Tightening torque
φ9.5(3/8")
12.6 – 13.0
32.7-39.9 N • m
φ15.9(5/8")
61.8-75.4 N • m
19.0 – 19.4
φ19.1(3/4")
97.2-118.8 N • m
23.3 – 23.7
• Refer to "Table 2" to determine the proper tightening torque.
CAUTION
• Over-tightening the flare nut may break it and/or cause the
refrigerant to leak.
Not recommendable 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 installation
method mentioned below.
After the work is finished, make sure to check that there is
no gas leak.
When you keep on tightening the flare nut with a spanner, there
is a point where the tightening torque suddenly increases.
From that position, further tighten the flare nut the angle shown
below:
Table 3
Pipe size Further tightening angle
φ9.5 (3/8")
60 to 90 degrees
φ15.9 (5/8")
30 to 60 degrees
φ19.1 (3/4")
25 to 35 degrees
• Make absolutely sure to execute heat insulation works on
the pipe-connecting section after checking gas leakage by
thoroughly studying the following figure and using the
attached heat insulating materials for couplings (6) and (7).
(Fasten both ends with the clamps (4).) (Refer to Fig. 23)
Attach to tha root
Insulation for gas
pipe (6) (accessory)
Clamp (4)
(×4) (accessory)
Fig. 22
R410A
Flare
FUQ
12.8 – 13.2
R0.4-0.8
19.3 – 19.7
Recommended arm
length of tool
Approx. 200mm
Approx. 300mm
Approx. 450mm
Insulation for liquid
pipe (7) (accessory)
Fig. 23
8