Drain Piping Work - Daikin FHQG71CVEB Installation Manual

3. 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.)
4. When the airtight test is performed for the indoor unit and inter-unit piping after indoor unit installation, be
sure to refer to the installation manual for the indoor unit or technical guide for airtight pressurization and
refrigerant piping installation.
5. If the refrigerant functions inefficiently due to a failure to perform air purge and additional refrigerant filling,
the devices may malfunction (no cooling or heating, etc.).
Please refer to the installation manual for the indoor unit and technical guide for the refrigerant piping
installation.
CAUTION
Do not use anything such as the oxidation inhibitor when brazing. (Residues may result in the clogging
pipe or parts damage.)

7. DRAIN PIPING WORK

(1) Carry out the drain piping.
• Make sure piping provides proper drainage.
• You can select whether to bring the drain piping our from the rear right, right, rear left, or left. For rear right-
facing and right-facing situations, refer to Fig. 15 for rear left-facing and left-facing situations. (Refer to Fig. 18)
Fig. 18
Rear side (metal plate)
removable part
• When setting piping facing left, move the rubber stopper and insulation which are attached to the drain pipe con-
nection hole on the left side of the indoor unit to the right-side drain pipe connection hole.
When doing this, insert the rubber stopper all the way in to prevent a water leakage.
After the drain hose installing, attach the protection net by reversing the steps taken to remove it. (Refer to Fig. 19)
• Make sure the pipe diameter is the same or bigger than the branch piping. (vinyl-chloride piping, nominal
diameter 20 mm, external diameter 26 mm)
• Make sure the piping is short, has at least a 1/100 slope, and can prevent air pockets from forming.
(Refer to Fig. 20)
Fig. 19
Protection net
Protection
fixing screw
net
CAUTION
Water accumulating in the drain piping can cause the drain to clog.
English
Fig. 20
Good
1 - 1.5m
Rear left-facing drain piping
Left dressing board removable part
Left-facing drain piping
Support
parts
Downward slope of
least 1/100 or greater
Wrong
Do not lift
Make sure
there is no
slack
Make sure
it is not in
the water
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