Daikin Altherma 3 HT - To Connect the Changeover to External Heat Source

9 | Electrical installation
Installer reference guide
122
EPRA14~18D + ETVH/X16S18+23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
A
Y27
B
A
B
7 9
X2M
A4P
Y2YC
X1M
ab
a Installation of EKRP1HBAA is required.
b Prewiring between X2M/7+9 and Q1L (=thermal protector backup heater). Do NOT
change.
3 Fix the cable with cable ties to the cable tie mountings.
9.3.8 To connect the changeover to external heat source
INFORMATION
Bivalent is only possible in case of 1 leaving water temperature zone with:
▪ room thermostat control, OR
▪ external room thermostat control.
Wires: 2×0.75mm²
Maximum load: 0.3A, 250VAC
Minimum load: 20mA, 5VDC
[9.C] Bivalent
1 Open the following (see "7.2.6To open the indoor unit"[469]):
1 Top panel
1
2
3
2 User interface panel
3 Upper switch box cover
2 Connect the changeover to external heat source cable to the appropriate
terminals as shown in the illustration below.