Reheat Mode; Scheduled Mode; Scheduled + Reheat Mode; To Change The Domestic Hot Water Temperature - Daikin Altherma 3 H F User Reference Manual

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.
T t
1
60°C
50°C
40°C
15°C
00:00 07:00
T DHW tank temperature
t
t Time
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
EAVZ16S18+23DA6V(7)+9W
Daikin Altherma 3 H F
4P556076-1A – 2021.09
3
2
4
t
14:00 21:00
4
3
5
t
14:00 21:00
▪ 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:
T t
1
2
60°C
50°C
45°C
35°C
15°C
00:00 07:00
T Domestic hot water tank temperature
t
t Time
4.5.5 To change the domestic hot water
temperature
In Reheat only mode, you can use the tank temperature setpoint
screen to read out and adjust the domestic hot water temperature.
1 Go to [5]: Tank.
5
Tank
2 Adjust the domestic hot water temperature.
a b
5
50
°C
Tank
a Actual domestic hot water temperature
b Desired domestic hot water temperature
In other modes, you can only view the setpoint screen but not modify
it. Instead, you can modify the settings for the Comfort setpoint
[5.2], Eco setpoint [5.3] and Reheat setpoint [5.4].
4 Operation
3 4
5
t
14:00 21:00
+
–
User reference guide
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