Daikin Altherma EHYKOMB33AA - Scheduled mode; Scheduled + reheat mode

4 | Operation
User reference guide
28
EHYHBH05AF + EHYHBH/X05+08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355632-1E – 2020.10
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.
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
T
t
T
t
Domestic hot water 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: 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.
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
t
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
DHWtank temperature
t Time
60°C Storage comfort
50°C Storage eco