5 Operation
Operation manual
9
EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680075-1B – 2022.02
In menu…
You can read out…
[8.8]
Connection status
Information about the connection
status of the unit, the room
thermostat and WLAN.
[8.9]
Running hours
Running hours of specific system
components
5.6
Domestic hot water control
5.6.1
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
60°C
00:00
07:00
50°C
15°C
40°C
14:00
21:00
1
2
3
4
Tt
T
t
DHW tank temperature
t
Time
INFORMATION
When the Priority Schedule is set to DHW (refer to
13]) and the DHW tank mode is
reheat at same time, the risk for capacity shortage and
comfort problem is significant. In case of frequent reheat
operation, space heating/cooling function is regularly
interrupted.
INFORMATION
The application of hysteresis (the amount of the
temperature drop that will trigger the heat up) might vary
depending on whether the target temperature is within
operation range of the outdoor unit. Please consult with
installer or check installer reference guide.
5.6.2
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
60°C
00:00
07:00
50°C
15°C
40°C
14:00
21:00
1
2
3
4
5
Tt
T
t
DHW tank temperature
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.
5.6.3
Sch 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
Tt
60°C
00:00
07:00
50°C
45°C
15°C
14:00
21:00
35°C
1
2
4
5
3
T
t
Domestic hot water tank temperature
t
Time
INFORMATION
The application of hysteresis (the amount of the
temperature drop that will trigger the heat up) might vary
depending on whether the target temperature is within
operation range of the outdoor unit. Please consult with
installer or check installer reference guide.
5.6.4
Using DHW powerful operation
About powerful operation
To check if powerful operation is active
If
is displayed on the home screen, powerful operation is active.
Activate or deactivate
Powerful operation
as follows:
1
Go to [5.1]:
Tank
>
Powerful operation
2
Turn powerful operation
Off
or
On
.
Usage example: You immediately need more hot water
You are in the following situation:
▪ You already consumed most of your domestic hot water.
▪ You cannot wait for the next scheduled action to heat up the
domestic hot water tank.
Then you can activate powerful operation. The domestic hot water
tank will start heating up the water to the
Comfort
temperature.
INFORMATION
When the Priority Schedule is set to DHW (refer to
13]) and powerful operation is
active, the risk of space heating/cooling and capacity
shortage comfort problems is significant. In case of
frequent domestic hot water operation, frequent and long
space heating/cooling interruptions will happen.
Powerful operation
allows the domestic hot water production to
be assisted by the booster heater. Use this mode on days when
there is more hot water usage than usual.
