6 Electrical installation
Installation manual
10
ETVH/23E
Daikin Altherma 3 H MT F
4P634880-1C – 2022.08
NOTICE
▪ The required concentration might differ depending on
the type of glycol. ALWAYS compare the requirements
from the table above with the specifications provided by
the glycol manufacturer. If necessary, meet the
requirements set by the glycol manufacturer.
▪ The added concentration of glycol should NEVER
exceed 35%.
▪ If the liquid in the system is frozen, the pump will NOT
be able to start. Mind that if you only prevent the
system from bursting, the liquid inside might still freeze.
▪ When water is at standstill inside the system, the
system is very likely to freeze and get damaged.
Glycol and the maximum allowed water volume
Adding glycol to the water circuit reduces the maximum allowed
water volume of the system. For more information, see the installer
reference guide (topic "To check the water volume and flow rate").
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.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
CAUTION
Do NOT push or place redundant cable length into 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%
M4 (earth)
1.47 ±10%
6.3
Connections to the indoor unit
Item
Description
Power supply (main)
See
"6.3.1 To connect the main power
12].
Power supply (backup
heater)
See
"6.3.2 To connect the backup heater
13].
Shut-off valve
See
"6.3.3 To connect the shut-off
Electricity meters
See
"6.3.4 To connect the electricity
14].
Domestic hot water
pump
See
"6.3.5 To connect the domestic hot
15].
Alarm output
See
Space cooling/heating
operation control
See
"6.3.7 To connect the space cooling/
16].
Changeover to
external heat source
control
See
"6.3.8 To connect the changeover to
16].
Power consumption
digital inputs
See
Safety thermostat
See
thermostat (normally closed
contact)"
17].
