6 Electrical installation
Installation manual
11
E120B
R32 Split series – Domestic hot water tank
4P680074-1C – 2022.11
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 7 bar (=0.7 MPa), and must be in accordance with the
applicable legislation. Provide adequate safeguards in the water
circuit to ensure that the maximum pressure is NOT exceeded
(see
"5.4.1 To connect the water piping"
11]). The minimum
water pressure to operate is 1 bar (=0.1 MPa).
▪
Water temperature.
All installed piping and piping accessories
(valve,
connections,…)
MUST
withstand
the
following
temperatures:
INFORMATION
The following figure is an example and may NOT
completely match your system layout
89°C (*)
EXAMPLE
(*) Maximum temperature for piping and accessories
5.4
Connecting water piping
5.4.1
To connect the water piping
NOTICE
Do NOT use excessive force when connecting the field
piping and make sure the piping is aligned properly.
Deformation of the piping can cause malfunctioning of the
unit.
1
Connect the domestic hot water in and out pipes to the indoor
unit.
a b
a
DHW – hot water OUT (screw connection, ½”)
b
DHW – cold water IN (screw connection, ½”)
2
Install the following components (field supply) on the cold water
inlet of the DHW tank:
h
d
b
a
e
c
*f
*g
c
a
DHW – hot water OUT (screw connection, ½”)
b
DHW – cold water IN (screw connection, ½”)
c
Shut-off valve (recommended)
d
Non-return valve (recommended)
e
Pressure reducing valve (recommended)
*f
Pressure relief valve (max. 7 bar (=0.7 MPa))(mandatory)
*g
Tundish (mandatory)
h
Expansion vessel (recommended)
WARNING
Do NOT install any valves between the domestic hot water
tank and the pressure relief valve.
NOTICE
A pressure relief valve (field supply) with an opening
pressure of maximum 7 bar (=0.7 MPa) must be installed
on the domestic cold water inlet connection in accordance
with the applicable legislation.
NOTICE
To avoid damage to the surroundings in case of water
leakage, it is recommended to close the domestic cold
water inlet shut‑off valves during periods of absence.
5.4.2
To fill the domestic hot water tank
1
Open every hot water tap in turn to purge air from the system
pipe work.
2
Open the cold water supply valve.
3
Close all water taps after all air is purged.
4
Check for water leaks.
5
Manually operate the field-installed pressure relief valve to
ensure a free water flow through the discharge pipe.
6
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
6.1
About electrical compliance
Only for the booster heater of the indoor unit
See
"6.3.2 To connect the booster heater power supply"
6.2
Guidelines when connecting the
electrical wiring
Tightening torques
Indoor unit:
