Preparing Water Piping; Connecting Water Piping; To Connect The Water Piping; To Fill The Domestic Hot Water Tank - Daikin EKHWET90BAV3 Installation Manual

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 (=0.4 MPa). 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
(=0.1 MPa).
▪ Water temperature. All installed piping and piping accessories
(valve, connections,...) MUST
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
(*) 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")
EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680074-1 – 2021.11
withstand the following
89°C (*)
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.
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
6.2 Guidelines when connecting the
electrical wiring
Tightening torques
Indoor unit:
Item
X2M
X5M
X8M
M4 (earth)
6.3

Connections to the indoor unit

Item
Power supply (main) See "6.3.1 To connect the main power
supply" [ 4 11].
Power supply (booster See "6.3.2 To connect the booster heater
supply" [ 4 12].
heater) power
WLAN cartridge See "6.3.3 To connect the WLAN cartridge
(delivered as
6.3.1

To connect the main power supply

1 Open the following (see "4.2.1 To open the indoor
2 Connect the main power supply.
Interconnection Wires: (3+GND)×1.5 mm²
cable (= main
power supply)
—
6 Electrical installation
supply" [ 4 12].
Tightening torque (N•m)
2.45 ±10%
0.88 ±10%
2.45 ±10%
1.47 ±10%
Description
accessory)" [ 4 13]
unit" [ 4 9]):
Installation manual
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