Daikin EPRA16DAW1 Installer's Reference Manual page 185

Emergency
EPRA14~18DAV3+W1 + ETBH/X16DA6V+9W
Daikin Altherma 3 H HT W
4P587501-1A – 2020.01
# Code
9.4.4 [4-03]
Emergency
When the heat pump fails to operate, the backup heater and/or booster heater
can serve as an emergency heater. It then takes over the heat load either
automatically or by manual interaction.
▪ When Emergency is set to Automatic and a heat pump failure occurs, the
backup heater automatically takes over the heat load, and the booster heater in
the optional tank takes over the domestic hot water production.
▪ When Emergency is set to Manual and a heat pump failure occurs, the
domestic hot water heating and space heating stops.
To manually recover it via the user interface, go to the Malfunctioning main
menu screen and confirm whether the backup heater and/or booster heater can
take over the heat load or not.
▪ Alternatively, when Emergency is set to:
- auto SH reduced/DHW on, space heating is reduced but domestic hot
water is still available.
- auto SH reduced/DHW off, space heating is reduced and domestic hot
water is NOT available.
- auto SH normal/DHW
domestic hot water is NOT available.
Similarly as in Manual mode, the unit can take the full load with the backup
heater and/or booster heater if the user activates this via the Malfunctioning
main menu screen.
To keep energy consumption low, we recommend to set Emergency to auto SH
reduced/DHW off if the house is unattended for longer periods.
# Code
[9.5.1] [4-06]
INFORMATION
The auto emergency setting can be set in the menu structure of the user interface
only.
Description
▪ 4: Booster heater operation is NOT allowed
except for "Disinfection function".
Only use this in case the capacity of the
heat pump can cover the heating requirements
of the house and domestic hot water over the
complete heating season.
The booster heater will not be allowed to
operate when T <[5‑03] and [5‑02]=1. The
a
domestic hot water temperature can be
maximum the heat pump OFF temperature.
off, space heating operates as normally but
Description
▪ 0: Manual
▪ 1: Automatic
▪ 2: auto SH reduced/DHW on
▪ 3: auto SH reduced/DHW off
▪ 4: auto SH normal/DHW off
9 Configuration
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Installer reference guide
185