Daikin EKHWET-BV3, Installer'S Reference Manual, Page: 84 / 120

10 | Configuration
Installer reference guide
84
E120B
R32 Split series – Domestic hot water tank
4P680077-1A – 2022.11
Operation
# Code Description
[9.4.4] [4-03] Defines the operation permission of the booster
heater depending on ambient, domestic hot
water temperature or operation mode of heat
pump.
[9.4.4] [4-03] ▪ 0 Restricted : Booster heater operation is
NOT allowed except for "Disinfection function"
and "Powerful domestic water heating".
Only use this in case the heat pump capacity
can cover the heating requirements of the
house and domestic hot water during the
complete heating season.
[9.4.4] [4-03] ▪ 1 Allowed : Booster heater operation is
allowed when required.
[9.4.4] [4-03] ▪ 2 Overlap : The booster heater is allowed
outside the operation range of the heat pump
for domestic hot water operation.
Booster heater operation is only allowed if:
- Ambient temperature is out of the operating
range: T
a
<-15_C] or T
a
>42°C
- Domestic hot water temperature is 2°C lower
than the heat pump OFF temperature.
9.4.4 [4-03] ▪ 3 Compressor off : The booster heater is
allowed when the heat pump is NOT active in
domestic hot water operation.
Same as setting 1, but simultaneous heat pump
domestic hot water operation and booster
heater operation is not allowed.
INFORMATION
If the selected value of [4-03] is other than 1, the Quick mode will not work, see
Operation mode, refer to
" Quick mode timer " [ 4 83].
Emergency
Emergency
When the heat pump fails to operate, the 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
booster heater in the tank automatically takes over the domestic hot water
production.
▪ When Emergency is set to Manual and a heat pump failure occurs, the
domestic hot water heating stops.
To manually recover it via the user interface, go to the Malfunctioning main
menu screen and confirm whether the booster heater can take over the heat
load or not.