7 Electrical installation
Installation manual
11
FTXTP-M_FTXTP-N
Daikin room air conditioner
3P650253-16U – 2023.03
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
6.1.2
Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4 mm (1/4")
8~10 mm
≥10 mm
9.5 mm (3/8")
10~14 mm
≥13 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
6.2
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
6.2.1
To connect the refrigerant piping to the
indoor unit
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
▪
Pipe length
. Keep refrigerant piping as short as possible.
1
Connect refrigerant piping to the unit using
flare connections
.
2
Wrap the refrigerant piping connection using vinyl tape,
overlapping at least half the width of the tape with each turn.
Keep the slit of the heat insulation pipe cover up. Avoid
wrapping the tape too tight.
b
a
c d
e
f
e
a
Heat insulation pipe cover (on the indoor unit side)
b
Flare connections
c
Liquid pipe (with insulation) (field supply)
d
Gas pipe (with insulation) (field supply)
e
Slit on heat insulation pipe cover facing up
f
Vinyl tape (field supply)
3
Insulate
the refrigerant piping, interconnection cable and drain
hose on the indoor unit: See
"8.1 To insulate the drain piping,
refrigerant piping and interconnection cable"
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
6.2.2
To check refrigerant piping joints for leaks
after charging refrigerant
1
Perform the leak tests according to instructions in the outdoor
unit installation manual.
2
Charge refrigerant.
3
Check for refrigerant leaks after charging (see below).
Tightness test of field-made refrigerant joints indoors
1
Use a leakage test method with a minimum sensitivity of 5 g of
refrigerant/year. Test leaks using a pressure of at least 0.25
times the maximum working pressure (see "PS High" on the
unit nameplate).
If a leak is detected
1
Recover the refrigerant, repair the joint, and repeat the test.
7
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least
3 mm between the contact point gaps that provides full
disconnection under overvoltage category III.
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.
WARNING
Do NOT connect the power supply to the indoor unit. This
could result in electrical shock or fire.
WARNING
▪ Do NOT use locally purchased electrical parts inside
the product.
▪ Do NOT branch the power supply for the drain pump,
etc. from the terminal block. This could result in
electrical shock or fire.
WARNING
Keep the interconnection wiring away from copper pipes
without thermal insulation as such pipes will be very hot.
7.1
Specifications of standard wiring
components
NOTICE
We recommend using solid (single-core) wires. If stranded
wires are used, slightly twist the strands to consolidate the
end of the conductor for either direct use in the terminal
clamp or insertion in a round crimp-style terminal. Details
are described in "Guidelines when connecting the electrical
wiring" in the installer reference guide.
