6 Electrical installation
Installation manual
18
ET9W
Daikin Altherma 3 H HT F
4P644730-1 – 2021.02
A
1
2
4
5
S6S
S7S
S8S
S9S
3
B
A
B
A8P
X801M
1
2
3
4
5
a
a
Installation of EKRP1AHTA is required.
3
Fix the cable with cable ties to the cable tie mountings.
6.3.10
To connect the safety thermostat
(normally closed contact)
1
Open the following (see
"4.2.1 To open the indoor unit"
6]):
1
Top panel
1
2
3
2
User interface panel
3
Upper switch box cover
Main zone
Wires: 2×0.75 mm²
—
2
Connect the safety thermostat (normally closed) cable to the
appropriate terminals as shown in the illustration below.
A
2
Q3L
1
B
A
B
X5M
1 2
3
Fix the cable with cable ties to the cable tie mountings.
INFORMATION
Installation of a safety thermostat (field supply) is required
for the main zone, otherwise the unit will NOT operate.
NOTICE
A safety thermostat MUST be installed on the main zone to
avoid too high water temperatures in this zone. The safety
thermostat is typically a thermostatically controlled valve
with a normally closed contact. When the water
temperature in the main zone is too high, the contact will
open and the user interface will show a 8H‑02 error. ONLY
the main pump will stop.
Additional zone
Wires: 2×0.75 mm²
Maximum length: 50 m
Safety thermostat contact: 16 V DC detection (voltage
supplied by PCB). The voltage-free contact shall ensure the
minimum applicable load of 15 V DC, 10 mA.
—
4
Connect the safety thermostat (normally closed) cable to the
appropriate terminals as shown in the illustration below.
Note:
The jumper wire (factory-mounted) must be removed from the
respective terminals.
