5 Operation
Operation manual
13
EWSAH/X06(U)D
Daikin Altherma 3 WS
4P675761-1C – 2023.02
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.
5.7.2
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
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.
5.7.3
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
5.7.4
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.
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 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.
5.8
Schedule screen: Example
This example shows how to set a room temperature schedule in
heating mode for the main zone.
INFORMATION
The procedures to program other schedules are similar.
To program the schedule: overview
Example:
You want to program the following schedule:
Mon
Sat
Wed
Fri
Thu
Tue
Sun
User defined 1
Prerequisite:
The room temperature schedule is only available if
room thermostat control is active. If leaving water temperature
control is active, you can program the main zone schedule instead.
1
Go to the schedule.
2
(optional) Clear the content of the whole week schedule or the
content of a selected day schedule.
3
Program the schedule for
Monday
.
4
Copy the schedule to the other weekdays.
5
Program the schedule for
Saturday
and copy it to
Sunday
.
6
Give the schedule a name.
To go to the schedule
1
Go to [1.1]:
Room
>
Schedule
.
2
Set scheduling to
Yes
.
3
Go to [1.2]:
Room
>
Heating schedule
.
