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8 Configuration
INFORMATION
In case of error code AH and no interruption of the
disinfection function occurred due to domestic hot water
tapping, following actions are recommended:
▪ When the Domestic hot water > Type > Reheat or
Reheat + sched. is selected, it is recommended to
program the start-up of the disinfection function at least
4 hours later than the last expected large hot water
tapping. This start-up can be set by installer settings
(disinfection function).
▪ When the Domestic hot water > Type > Scheduled only
is selected, it is recommended to program a Storage
eco 3 hours before the scheduled start-up of the
disinfection function to preheat the tank.
INFORMATION
Disinfection function is restarted in case the domestic hot
water temperature drops 5°C below the disinfection target
temperature within the duration time.
INFORMATION
An AH error occurs if you do the following during
disinfection:
▪ Set the user permission level to Installer.
▪ Go to the DHW tank temperature home page (Tank).
▪ Press
to interrupt the disinfection.
8.3.3
Heat source settings
Backup heater
For systems without domestic hot water tank or with separate
domestic hot water tank (only for EHBH/X)
Backup heater operation mode: defines when backup heater
operation is enabled or disabled. This setting is only overruled when
backup heating is required during defrost operation or malfunctioning
of the outdoor unit (when [A.6.C] is enabled).
For systems with an integrated domestic hot water tank (only
for EHVH/X)
Backup heater operation mode: defines when backup heater
operation is disabled or only allowed during domestic hot water
operation. This setting is only overruled when backup heating is
required during defrost operation or malfunctioning of the outdoor
unit (when [A.6.C] is enabled).
#
Code
[A.5.1.1]
[4‑00]
Backup heater operation:
▪ 0: Disabled
▪ 1 (default): Enabled
[A.5.1.3]
[4‑07]
Defines whether backup heater second
step is:
▪ 1: Allowed
▪ 0: NOT allowed
In this way it is possible to limit the
backup heater capacity.
N/A
[5-00]
Is backup heater operation allowed
above equilibrium temperature during
space heating operation?
▪ 1: NOT allowed
▪ 0: Allowed
Installer reference guide
66
Description
#
Code
[A.5.1.4]
[5‑01]
Equilibrium temperature.
Outdoor temperature below which
operation of the backup heater is
allowed.
Range: –15°C~35°C (default: 0°C) (step:
1°C)
INFORMATION
Only for systems with integrated domestic hot water tank: If
backup heater operation during space heating needs to be
limited but can be allowed for domestic hot water
operation, then set [4‑00] to 2.
INFORMATION
Only for systems with integrated domestic hot water tank: If
the storage temperature set point is higher than 50°C,
Daikin recommends NOT to disable the backup heater
second step because it will have a big impact on the
required time for the unit to heat up the domestic hot water
tank.
Auto emergency
When the heat pump fails to operate, the backup heater can serve
as an emergency heater and either automatically or non-
automatically take over the heat load.
▪ When auto emergency is set to Automatic and a heat pump failure
occurs, the backup heater will automatically take over the heat
load.
▪ When auto emergency is set to Manual and a heat pump failure
occurs, the domestic hot water and space heating operations will
stop and need to be recovered manually. The user interface will
then ask you to confirm whether the backup heater can take over
the heat load or not.
When the heat pump fails,
will appear on the user interface. If the
house is unattended for longer periods, we recommend to set
[A.6.C] Emergency to Automatic.
#
Code
[A.6.C]
N/A
Emergency:
▪ 0: Manual (default)
▪ 1: Automatic
INFORMATION
The auto emergency setting can be set in the menu
structure of the user interface only.
INFORMATION
If a heat pump failure occurs and [A.6.C] is set to Manual,
the room frost protection function, the underfloor heating
screed dryout function, and the water pipe antifreeze
function will remain active even if the user does NOT
confirm emergency operation.
Bivalent
Applies only to installations with an auxiliary boiler (alternating
operation, parallel connected). The purpose of this function is to
determine — based on the outdoor temperature (possibility 1) or on
energy prices (possibility 2) — which heating source can/will provide
the space heating, either the indoor unit or an auxiliary boiler.
The field setting "bivalent operation" applies only the indoor unit
space heating operation and the permission signal for the auxiliary
boiler.
Possibility 1
ERHQ+ERLQ011~016 + EHVH/X11+16S18+26CB
Description
Description
Daikin Altherma – Low temperature split
4P384975-1C – 2018.02
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