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4 Operation
User reference guide
10
EHBH/X04+08+16CA + EHVH/X04+08+16CA
Daikin Altherma - Low Temperature Split
4P313778-1B – 2012.11
2 Press or to adjust.
Example:
45°C 4C
4.5 Domestic hot water control
4.5.1 About domestic hot water control
Depending on the DHW tank mode (installer setting), you use a
different domestic hot water control:
Reheat mode
Scheduled mode
Scheduled + reheat mode
CAUTION
The booster heater permission schedule is used to restrict
or allow booster heater operation based on a weekly
program. Advice: In order to avoid unsuccessful
disinfection function, at least allow the booster heater (by
the weekly program) for minimum 4 hours starting from the
scheduled start-up of disinfection. If the booster heater is
restricted during disinfection, this function will NOT be
successful and the applicable warning AH will be
generated.
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 > Setpoint mode >
Reheat or Reheat + sched. is selected, it is
recommended to program the start-up 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 > Setpoint mode >
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.
To determine which DHW tank mode you are
using (method 1)
Check the installer settings table filled in by the installer.
To determine which DHW tank mode you are
using (method 2)
Prerequisite: User profile = Detailed.
1 Go to the DHW tank temperature home page (Tank).
2 Check which icons are displayed:
If… is displayed Then the DHW tank mode =…
Reheat mode
Scheduled mode
Scheduled + reheat mode
4.5.2 Reheat mode
In reheat mode ( ), the DHW tank continuously heats up to the
desired temperature (example: 50°C).
t
60°C
00:00 07:00
50°C
15°C
40°C
14:00 21:00
1
2
3
4
5
T
t
T
t
: DHW tank temperature
t: Time
INFORMATION
It is recommended NOT to use the selection of ([60D]=0,
[A.4.1] Domestic hot water Setpoint mode=Reheat only) in
case of a domestic hot water tank without internal booster
heater.
The risk of space heating (cooling) capacity shortage/
comfort problems is significant (in case of frequent
domestic hot water operation, frequent and long space
heating/cooling interruption will happen).
In reheat mode, you can do the following:
You can… Location
Read out the desired reheat temperature. DHW tank
temperature
home page
Adjust the reheat temperature.
Condition:
is displayed on the DHW tank
temperature home page.
Activate the DHW tank booster mode.
(Only for EHBH/X)
Program a booster heater allowance schedule
to restrict when the booster heater can operate.
Example: Only allow the booster heater to operate
during the night.
Menu structure
(Only for field supplied domestic hot water
pump for secondary return)
Program a domestic hot water pump schedule
to determine when to turn ON and OFF the pump.
When turned ON, the pump runs and makes sure
hot water is instantly available at the tap. To save
energy, only turn ON the pump during periods of
the day when instant hot water is necessary.
See also:
"4.5.5 Using the DHW tank temperature home page" on page 11
"4.5.6 Using the DHW tank booster mode" on page 12
"4.7 Preset values and schedules" on page 15
4.5.3 Scheduled mode
In scheduled mode ( ), the DHW tank produces hot water
corresponding to a schedule. The best time to produce hot water is
during the night, because (possibly):
Space heating demand is lower
Electric tariffs are lower
Example:
10


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