5 Piping installation
Installation manual
13
23EA
Daikin Altherma 3 R F
4P629088-1C – 2021.11
Gas piping
Ø15.9 mm (5/8")
▪
Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
Annealed (O)
≥0.8 mm
t
Ø
15.9 mm (5/8")
Annealed (O)
≥1.0 mm
(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.
5.1.2
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
15.9 mm (5/8")
16~20 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.
5.2
Connecting refrigerant piping
See the installation manual of the outdoor unit for all guidelines,
specifications and installation instructions.
5.2.1
To connect the refrigerant piping to the
indoor unit
1
Connect the liquid stop valve from the outdoor unit to the
refrigerant liquid connection of the indoor unit.
b
a
a
Refrigerant liquid connection
b
Refrigerant gas connection
2
Connect the gas stop valve from the outdoor unit to the
refrigerant gas connection of the indoor unit.
INFORMATION
When the indoor unit is installed in a place with limited
space, an optional pipe bend (EKHVTC) kit can be
installed to facilitate the connection to the refrigerant gas
and liquid connections of the indoor unit. For installation
instructions, see the instruction sheet of the pipe bend kit.
5.3
Preparing water piping
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
NOTICE
Water circuit requirements.
Make sure to comply with the
water pressure and water temperature requirements
below. For additional water circuit requirements, see the
installer reference guide.
▪
Water pressure – Domestic hot water.
The maximum water
pressure is 4 bar. Provide adequate safeguards in the water circuit
to ensure that the maximum pressure is NOT exceeded. The
minimum water pressure to operate is 1 bar.
▪
Water pressure –
Space heating/cooling circuit.
The maximum
water pressure is 3 bar. Provide adequate safeguards in the water
circuit to ensure that the maximum pressure is NOT exceeded.
The minimum water pressure to operate is 1 bar.
▪
Water temperature.
All installed piping and piping accessories
(valve,
connections,…)
MUST
withstand
the
following
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
M
M
FCU1
FCU2
FCU3
FHL1
FHL2
FHL3
a
b
c
d
e
f
g
f
h
i
i
i
i
j
k
89°C
75°C
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Backup heater
e
Pump
f
Stop valve
g
Motorised 3-way valve
h
Motorised 2-way valve (field supply)
i
Collector
j
Domestic hot water tank
k
Heat exchanger coil
FCU1...3
Fan coil unit (optional) (field supply)
FHL1...3
Floor heating loop (field supply)
T
Room thermostat (optional) (field supply)
▪
Valve towards expansion vessel.
The valve towards the
expansion vessel (if equipped) MUST be open.
