Daikin VRV III, Manual, Page: 76 / 455

ED34-862 Installation Manual
FXFQ-P 71
2
3P161684-3B
11 English
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.
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:
After the work is finished, make sure to check that there is no gas leak.
• 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
fitting (8) and (9). (Fasten both ends with the clamps (4).)
(Refer to Fig. 16)
• Wrap the sealing pad (11) only around the insulation for the joints on the gas piping side. (Refer to Fig. 16)
CAUTION
For local insulation, be sure to insulate local piping all the way into the pipe connections inside the machine.
Exposed piping may cause condensation or burns on contact.
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
“Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filler metal
(BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux.”
(Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant oil.)
Pipe size Further tightening angle Recommended arm length of tool
φ
6.4 (1/4”) 60 to 90 degrees Approx. 150mm
φ
9.5 (3/8”) 60 to 90 degrees Approx. 200mm
φ
12.7 (1/2”) 30 to 60 degrees Approx. 250mm
φ
15.9 (5/8”) 30 to 60 degrees Approx. 300mm
Screw mounting part
of piping presser plate
(2 locations)
Liquid piping
Gas piping
Fig. 16
Gas Piping Insulation Procedure
Insulation for fitting (8)
(accessory)
Turn seams up
Turn seams up
Flare nut connection
Insulation for fitting (9)
(accessory)
Flare nut connection
Attach to base
Attach to base
Main unit
Main unit
Piping insulation
material
(Field supply)
Piping insulation
material
(Field supply)
Tighten the part other
than the piping insulation
material.
Wrap over from the
base of the unit to
the top of the flare
nut connection.
Wrap the
insulator around
the part from the
root.
Sealing pad
medium-1 (11)
(accessory)
Sealing pad
medium-2 (12)
(accessory)
Clamp (4) (accessory)
Tighten the part other
than the piping insulation
material.
Clamp (4) (accessory)
Liquid Piping Insulation Procedure
Piping insulation
material (main unit)
Piping insulation
material (main unit)
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