Daikin EPRA18DAW1 Installer's Reference Manual page 104

8 | Electrical installation
Installer reference guide
104
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B
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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.
[9.8.1]=3 (Benefit kWh power supply = Safety thermostat)
4 Connect the safety thermostat (normally closed) cable to the appropriate
terminals as shown in the illustration below.
Q3L
1
2
1 2
X5M
EPRA14~18DAV3+W1 + ETVZ16S18+23DA6V+9W
Daikin Altherma 3 H HT F
4P587503-1A – 2020.01