Daikin Altherma 3 HT - Connections to the Indoor Unit

9 | Electrical installation
Installer reference guide
109
EPRA14~18D + ETVH/X16S18+23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
9.3 Connections to the indoor unit
Item Description
Power supply (main) See "9.3.1To connect the main power
supply"[4112].
Power supply (backup
heater)
See "9.3.2To connect the backup heater power
supply"[4114].
Shut-off valve See "9.3.3To connect the shut-off valve"[4117].
Electricity meters See "9.3.4To connect the electricity meters"[4118].
Domestic hot water pump See "9.3.5To connect the domestic hot water
pump"[4119].
Alarm output See "9.3.6To connect the alarm output"[4120].
Space cooling/heating
operation control
See "9.3.7To connect the space cooling/heating ON/
OFF output"[4121].
Changeover to external
heat source control
See "9.3.8To connect the changeover to external
heat source"[4122].
Power consumption digital
inputs
See "9.3.9To connect the power consumption
digital inputs"[4123].
Safety thermostat See "9.3.10To connect the safety thermostat
(normally closed contact)"[4124].
Smart Grid See "9.3.11To connect a Smart Grid"[4125].
WLAN cartridge See "9.3.12To connect the WLAN cartridge
(delivered as accessory)"[4129].
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] Ext thermostat type
For the additional zone:
▪ [3.A] Ext thermostat type
▪ [3.9] (read-only) Control