Drain Piping Work; Electric Wiring Work - Daikin FXMQ30MVJU Installation Manual

6-4 Brazing referigerant piping
• 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 piping, 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, con-
nect the indoor unit with a flared or a flanged connection.
• Nitrogen should be set to 2.9psi. with a pressure-reducing
valve if brazing while inserting nitrogen into the piping.
NOTE
Do not use flux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing filter metal (BCuP) which
does not require flux.
(Flux has extremely harmful infulence on refrigerant piping
sysems. 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.)
7.

DRAIN PIPING WORK

〈〈Rig the drain pipe as shown below and take measures
against condensation. Improperly rigged piping could lead
to leaks and eventually wet furniture and belongings.〉〉
〈〈Insulate the drain piping inside the building.〉〉
(1) Carry out the drain piping.
• Keep piping as short as possible and slope it downwards
so that air may not remain trapped inside the pipe.
• Keep pipe size equal to or greater than that of the con-
necting pipe (Vinyl pipe of 1 " nominal diam. and 1 1/4"
outer diam.).
• Use the attached drain hose and clamp.
Tighten the clamp firmly.
• Insulate the metal clamp with the sealing pad.
• There is negative pressure inside the unit relative to atmo-
spheric pressure when the unit is running, so be sure to
provide condensate trap on the condensate outlet. (See
the figure)
• In order to prevent foreign matter from building up
inside the piping, you should avoid curves as much
as possible, and arrange so the trap can be cleaned.
NOTE
• If converging multiple drain pipes, install according to the pro-
cedure shown below. (Install a condensate trap for each
indoor unit.)
(2) After piping work is finished, check drainage flows
smoothly.
• Add approximately 61in
and check drainage flow.
NOTE
• Drain piping connections
Do not connect the drain piping directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might enter
the indoor unit through the drain pipes and corrode the heat
exchanger.
8.

ELECTRIC WIRING WORK

8-1 GENERAL INSTRUCTIONS
• All field supplied parts and materials and electric works must
conform to local codes.
• Use copper wire only.
• For electric wiring work, refer to also "Wiring diagram label"
attached to the electric parts box lid.
• For remote controller wiring details, refer to the installation
manual attached to the remote controller.
• All wiring must be performed by an authorized electrician.
• This system consists of multiple indoor units. Mark each
indoor unit as unit A, unit B..., and be sure the terminal board
wiring to the outdoor unit and BS unit are properly matched.
If wiring and piping between the outdoor unit and an indoor
unit are mismatched, the system may cause a malfunction.
• A circuit breaker capable of shutting down power supply to
the entire system must be installed.
• Refer to the installation manual attached to the outdoor unit
for the size of power supply wiring connected to the outdoor
unit, the capacity of the circuit breaker and switch, and wiring
instructions.
• Be sure to ground the air conditioner.
• Do not connect the ground wire to gas and water pipes, light-
ning rods, or telephone ground wires.
3
of water slowly from the air inlet
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