To Change The Desired Leaving Water Temperature; Domestic Hot Water Control; Reheat Mode; Scheduled Mode - Daikin Altherma 3 H HT F Series Operation Manual

4.6.3 To change the desired leaving water
temperature
INFORMATION
The leaving water is the water that is sent to the heat
emitters. The desired leaving water temperature is set by
your installer in accordance with the heat emitter type.
Only adjust the leaving water temperature settings in case
of problems.
You can use the leaving water temperature setpoint screen to read
out and adjust the desired leaving water temperature.
1 Go to [2]: Main zone or [3]: Additional zone.
2
Main zone
3
Additional zone
2 Adjust the desired leaving water temperature.
a b
2
35
°C
Main zone
a b
3
45
°C
Additional zone
a Actual leaving water temperature
b Desired leaving water temperature
4.7

Domestic hot water control

4.7.1

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
ETVZ16S18+23DA6V+9W
Daikin Altherma 3 H HT F
4P586460-1 – 2019.07
+
–
+
–
3
2 4
14:00 21:00 t
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.
4.7.2

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.
4.7.3

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 DHW tank temperature
t
t Time
4.7.4

Using DHW powerful operation

About powerful operation
Powerful operation allows the domestic hot water to be heated by
the backup heater. Use this mode on days when there is more hot
water usage than usual.
4 Operation
4
3
5
t
14:00 21:00
3 4
5
t
14:00 21:00
Operation manual
13