6 Electrical installation
Installation manual
15
ELBH/X12E
Daikin Altherma 3 R MT W
4P708482-1 – 2023.03
a
b
a
Space heating/cooling – Water OUT (screw connection,
1")
b
Space heating/cooling – Water IN (screw connection, 1")
2
Screw the indoor unit nuts on the shut-off valves.
3
Connect the field piping on the shut-off valves.
4
In case of connection with the optional domestic hot water tank,
see the installation manual of the domestic hot water tank.
NOTICE
Install air purge valves at all local high points.
NOTICE
Differential
pressure bypass valve
(delivered as
accessory). We recommend to install the differential
pressure bypass valve in the space heating water circuit.
▪ Mind the minimum water volume when choosing the
installation location of the differential pressure bypass
valve (at the indoor unit, or at the collector). See
"5.3.1 To check the water volume and flow rate"
14].
▪ Mind the minimum flow rate when adjusting the
differential pressure bypass valve setting. See
"5.3.1 To check the water volume and flow rate"
and
"8.2.1 To check the minimum flow rate"
NOTICE
In case an optional domestic hot water tank is installed: A
pressure relief valve (field supply) with an opening
pressure of maximum 10 bar (= 1 MPa) must be installed
on the domestic cold water inlet connection in accordance
with the applicable legislation.
NOTICE
In case an optional domestic hot water tank is installed:
▪ A drain device and pressure relief device must be
installed on the cold water inlet connection of the
domestic hot water cylinder.
▪ To avoid back siphonage, it is recommended to install a
non-return valve on the water inlet of the domestic hot
water tank in accordance with the applicable legislation.
Make sure it is NOT between the pressure relief valve
and the DHW tank.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ It is recommended to install an expansion vessel on the
cold water inlet in accordance with the applicable
legislation.
▪ It is recommended to install the pressure relief valve on
a higher position than the top of the domestic hot water
tank. Heating of the domestic hot water tank causes
water to expand and without pressure relief valve the
water pressure inside the tank can rise above the tank
design pressure. Also the field installation (piping,
tapping points, etc.) connected to the tank is subjected
to this high pressure. To prevent this, a pressure relief
valve needs to be installed. The overpressure
prevention depends on the correct operation of the field
installed pressure relief valve. If this is NOT working
correctly, overpressure will deform the tank and water
leakage may occur. To confirm good operation, regular
maintenance is required.
5.4.2
To fill the water circuit
To fill the water circuit, use a field supply filling kit. Make sure you
comply with the applicable legislation.
NOTICE
Pump.
To prevent blocking of the pump rotor, commission
the unit as quickly as possible after filling the water circuit.
INFORMATION
Make sure both air purge valves (one on the magnetic filter
and one on the backup heater) are open.
5.4.3
To fill the domestic hot water tank
See the installation manual of the domestic hot water tank.
5.4.4
To insulate the water piping
The piping in the complete water circuit MUST be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity.
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
Electrical installation
DANGER: RISK OF ELECTROCUTION
