Daikin Altherma EHYKOMB AA Series User Reference Manual page 28

4 | Operation
Scheduled mode
Scheduled + reheat mode
User reference guide
28
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.
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
60°C
50°C
40°C
15°C
00:00
T Domestic hot water 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: Storage 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: Storage 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.
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
60°C
50°C
45°C
35°C
15°C
00:00
T DHW tank temperature
t
t Time
60°C Storage comfort
50°C Storage eco
1
2
4
3
5
07:00 14:00 21:00
1
2
3
07:00 14:00 21:00
t
4
5
t
EHYHBH05AF + EHYHBH/X05+08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355632-1E – 2020.10