6 Electrical installation
Installation manual
11
ET9W
Daikin Altherma 3 H HT F
4P644730-1 – 2021.02
Glycol setting
NOTICE
If glycol is present in the system, setting [E-0D] must be
set to 1. If the glycol setting is NOT set correctly, the liquid
inside the piping can freeze.
Freeze protection by freeze protection valves
About freeze protection valves
When no glycol is added to the water, you can use freeze protection
valves to drain the water from the system before it can freeze.
▪ Install freeze protection valves (field supply) at all lowest points of
the field piping.
▪ Normally closed valves (located indoors near the piping entry/exit
points) can prevent that all water from indoor piping is drained
when the freeze protection valves open.
NOTICE
When freeze protection valves are installed, set the
minimum cooling setpoint (default=7°C) at least 2°C higher
than the maximum opening temperature of the freeze
protection valve. If lower, freeze protection valves can
open during cooling operation.
For more information, see the installer reference guide.
5.2.5
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.
5.2.6
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.
Outdoor water piping insulation
See the installation manual of the outdoor unit, or the installer
reference guide.
6
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
CAUTION
Do NOT push or place redundant cable length in the unit.
NOTICE
The distance between the high voltage and low voltage
cables should be at least 50 mm.
6.1
About electrical compliance
Only for the backup heater of the indoor unit
"6.3.2 To connect the backup heater power supply"
6.2
Guidelines when connecting the
electrical wiring
Tightening torques
Indoor unit:
Item
Tightening torque (N•m)
X1M
2.45 ±10%
X2M
0.88 ±10%
X5M
0.88 ±10%
X6M
2.45 ±10%
X10M
0.88 ±10%
6.3
Connections to the indoor unit
Item
Description
Power supply (main)
"6.3.1 To connect the main power
Power supply (backup
heater)
"6.3.2 To connect the backup heater
Shut-off valve
"6.3.3 To connect the shut-off
14].
Electricity meters
"6.3.4 To connect the electricity
Domestic hot water
pump
"6.3.5 To connect the domestic hot
Alarm output
16].
Space heating
operation control
See To connect the space heating ON/OFF
output.
Changeover to
external heat source
control
"6.3.8 To connect the changeover to
Power consumption
digital inputs
17].
Safety thermostat
thermostat (normally closed
contact)"
Smart Grid
Room thermostat
(wired or wireless)
See below table.
Wires: 0.75 mm²
Maximum running current: 100 mA
For the main zone:
▪ [2.9]
Control
▪ [2.A]
Thermostat type
For the additional zone:
▪ [3.A]
Thermostat type
▪ [3.9] (read-only)
Control
