To Braze The Pipe End; To Connect The Refrigerant Piping To The Indoor Unit; Connecting The Electrical Wiring; About Connecting The Electrical Wiring - Daikin FDXM25F3V1B Installer's Reference Manual

Flare tool for
R410A or R32
Clutch type
(clutch type)
(Ridgid-type)
A 0~0.5 mm 1.0~1.5 mm
5 Check that the flaring is properly made.
a b
c
a Flare's inner surface must be flawless.
b The pipe end must be evenly flared in a perfect circle.
c Make sure the flare nut is fitted.
6.3.6

To braze the pipe end

The indoor unit and outdoor unit have flare connections. Connect
both ends without brazing. If brazing should be needed, take the
following into account:
▪ When brazing, blow through with nitrogen to prevent creation of
large quantities of oxidised film on the inside of the piping. This
film adversely affects valves and compressors in the refrigerating
system and prevents proper operation.
▪ Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so it
can be felt on the skin) with a pressure-reducing valve.
a b
f
a Refrigerant piping
b Part to be brazed
c Taping
d Manual valve
e Pressure-reducing valve
f Nitrogen
▪ Do NOT use anti-oxidants when brazing pipe joints.
Residue can clog pipes and break equipment.
▪ Do NOT use flux when brazing copper-to-copper refrigerant
piping. Use phosphor copper brazing filler alloy (BCuP), which
does not require flux.
Flux has an extremely harmful influence on refrigerant piping
systems. For instance, if chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
deteriorate the refrigerant oil.
6.3.7 To connect the refrigerant piping to the
indoor unit
WARNING: FLAMMABLE MATERIAL
The R32 refrigerant (if applicable) in this unit is mildly
(a)
flammable.
(a) Refer to the outdoor unit specifications for the type of
refrigerant to be used.
▪ Pipe length. Keep refrigerant piping as short as possible.
▪ Flare connections. Connect refrigerant piping to the unit using
flare connections.
▪ Insulation. Insulate the refrigerant piping on the indoor unit as
follows:
FDXM25~60F3V1B
Split system air conditioners
4P482333-1 – 2017.03
Conventional flare tool
Wing nut type
(Imperial-type)
1.5~2.0 mm
c d e
f
A
a b c
1
B A
A Gas piping
B Liquid piping
a Insulation material (field supply)
b Cable tie (accessory)
c Insulation pieces: Large (gas pipe), small (liquid pipe)
(accessories)
d Flare nut (attached to the unit)
e Refrigerant pipe connection (attached to the unit)
f Unit
g Sealing pads: Medium 1 (gas pipe), medium 2 (liquid pipe)
(accessories)
1 Turn up the seams of the insulation pieces.
2 Attach to the base of the unit.
3 Tighten the cable ties on the insulation pieces.
4 Wrap the sealing pad from the base of the unit to the top of
the flare nut.
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
6.4

Connecting the electrical wiring

6.4.1

About connecting the electrical wiring

Typical workflow
Connecting the electrical wiring typically consists of the following
stages:
1 Making sure the power supply system complies with the
electrical specifications of the units.
2 Connecting the electrical wiring to the outdoor unit.
3 Connecting the electrical wiring to the indoor unit.
4 Connecting the main power supply.
6.4.2 Precautions when connecting the
electrical wiring
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
6.4.3 Guidelines when connecting the electrical
wiring
Keep the following in mind:
6 Installation
B
d b e f
a b c d b
3 2 3
1
g 4 g
4
Installer reference guide
e f
2
13