Domestic Hot Water Control; Reheat Mode; Scheduled Reheat Mode; Using Dhw Powerful Operation - Daikin ETSHB12P30EF Operation Manual

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
5.7

Domestic hot water control

5.7.1

Reheat mode

In reheat mode the storage 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 Storage tank temperature
t
t Time
INFORMATION
Risk of space heating capacity shortage: In case of
frequent tank operation, frequent and long space heating/
cooling interruption will happen when selecting the
following:
Tank > Heat up mode > Reheat only.
5.7.2

Scheduled reheat mode

In scheduled reheat mode the storage tank set temperature varies
according to the schedule. When the tank temperature drops below
the set temperature minus the heat pump ON hysteresis
temperature [6-00], the tank heats up to the reheat temperature.
Example:
T t
1
2
60°C
50°C
40°C
15°C
00:00 07:00
T Storage tank temperature
t
ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663481-1A – 2022.07
+
–
+
–
3
2 4
t
14:00 21:00
3
6
4
5
t
14:00 21:00
t Time
▪ At 14:00 the DHW schedule is programmed to heat up the tank to
60°C.
▪ At 21:00 the DHW schedule is programmed to heat up the tank to
50°C. This value is valid until 14:00 the next day.
▪ With the higher set temperature, in the afternoon and evening
more hot water is available.
▪ During the morning, you consume hot water and the storage tank
temperature decreases.
▪ When the tank temperature drops below a preset value (=set
temperature – hysteresis value; example 40°C), the tank is heated
up to 50°C.
▪ During the afternoon and evening, you consume hot water again
and the DHW tank temperature decreases again.
▪ When the tank temperature drops below a preset value (=set
temperature – hysteresis value; example 50°C), the tank is heated
up to 60°C.
5.7.3

Using DHW powerful operation

About powerful operation
Powerful operation allows the domestic hot water to be heated by
the backup heater or booster 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 tank temperature setpoint.
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:
User defined 1
Mon
Tue
Wed
Thu
Fri
Sat
Sun
5 Operation
Operation manual
13