Daikin fxzq20mve, Руководство по установке

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10 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 fol-
low the installation method mentioned below.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque sud-
denly 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.
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.)
• Before brazing local refrigerant piping, nitrogen gas shall be blown through the piping to expel air from the
piping.
If your brazing is done without nitrogen gas blowing, a large amount of oxide film develops inside the pip-
ing, and could cause system malfunction.
• When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution or
while inserting nitrogen into the refrigerant piping. Once this is done, connect the indoor unit with a flared
or a flanged connection.
• Nitrogen should be set to 0.02 MPa with a pressure-reducing valve if brazing while inserting nitrogen into
the piping. (Refer to Fig.15)
• 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 fit-
ting (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)
Pipe size Further tightening angle Recommended arm length of tool
ø6.4 (1/4”) 60 – 90 degrees Approx. 150mm
ø12.7 (1/2”) 30 – 60 degrees Approx. 250mm
Nitrogen
Pressure-reducing valve
hands valve
Taping
Refrigerant piping
Part to be
brazed
Nitrogen
Fig. 15
Small sealing pad
(accessory) (11)
(Wrap the piping union
with the sealing pad.)
Insulation for fitting
(accessory) (9)
Insulation for fitting (accessory) (8)
(for gas pipe)
(for liquid pipe)
Gas piping
Liquid piping
Clamp (4)
(Big 4)
Fig. 16
(accessory)
01_EN_3P184443-5S.fm Page 10 Friday, October 16, 2015 6:44 PM