Daikin Altherma 3 R F+W EHVH08S23D Series Podręcznik użytkownika - Strona 9
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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 only
▪ Schedule + reheat
▪ Schedule only
CAUTION
The booster heater permission schedule is used to restrict
or allow booster heater operation based on a weekly
program.
Advice:
In
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 Reheat only or Schedule + reheat mode
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 Schedule
recommended to program an Eco action 3 hours before
the scheduled start-up of the disinfection function to
preheat the tank.
To determine which domestic hot water mode you are using
(method 1)
Check the installer settings table filled in by the installer.
To determine which domestic hot water mode you are using
(method 2)
1 Go to [5]: Tank.
2 Check which items are displayed:
[5.1]
Powerful operation
[5.2]
Comfort setpoint
[5.3]
Eco setpoint
[5.4]
Reheat setpoint
[5.5]
Schedule
If... is displayed
Then the DHW tank mode =...
Only [5.1] Powerful
Reheat only
operation
All items except [5.4]
Schedule only
Reheat setpoint are
displayed
All items including [5.4]
Schedule + reheat
Reheat setpoint are
displayed
4.5.2
Reheat mode
In reheat mode the DHW tank continuously heats up to the
temperature shown on the home screen (example: 50°C) when the
temperature drops below a certain value.
EHBH/X04+08DA + EHVH/X04+08S18+23DA + EHVH/
X04+08S18+23DJ
Daikin Altherma 3 R F+W
4P495250-1B – 2019.06
order
to
avoid
unsuccessful
only mode is selected, it is
T t
1
60°C
50°C
40°C
15°C
00:00
07:00
T
DHW tank temperature
t
t
Time
INFORMATION
Risk of space heating capacity shortage for domestic hot
water tank without internal booster heater: In case of
frequent domestic hot water operation, frequent and long
space heating/cooling interruption will happen when
selecting the following:
Tank > Heat up mode > Reheat only.
INFORMATION
When the DHW tank mode is reheat, the risk for capacity
shortage and comfort problem is significant. In case of
frequent reheat operation, space heating/cooling function
is regularly interrupted.
4.5.3
Scheduled mode
In scheduled mode the DHW tank produces hot water corresponding
to a schedule. The best time to allow the tank to produce hot water is
at night, because the space heating demand is lower.
Example:
T t
1
2
60°C
50°C
40°C
15°C
00:00
07:00
T
DHW tank temperature
t
t
Time
▪ Initially, the DHW tank temperature is the same as the
temperature of the domestic water entering the DHW tank
(example: 15°C).
▪ At 00:00 the DHW tank is programmed to heat up the water to a
preset value (example: Comfort = 60°C).
▪ During the morning, you consume hot water and the DHW tank
temperature decreases.
▪ At 14:00 the DHW tank is programmed to heat up the water to a
preset value (example: Eco = 50°C). Hot water is available again.
▪ During the afternoon and evening, you consume hot water again
and the DHW tank temperature decreases again.
▪ At 00:00 the next day, the cycle repeats.
4.5.4
Scheduled + reheat mode
In scheduled + reheat mode, the domestic hot water control is the
same as in scheduled mode. However, when the DHW tank
temperature drops below a preset value (=reheat tank temperature –
hysteresis value; example: 35°C), the DHW tank heats up until it
reaches the reheat set point (example: 45°C). This ensures that a
minimum amount of hot water is available at all times.
Example:
4 Operation
3
2
4
t
14:00
21:00
4
3
5
t
14:00
21:00
User reference guide
9