Daikin RHBH04CB [12/28] Operation
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Daikin RHBH04CB [12/28] Operation

Daikin RHBH08CB [12/28] Operation
4 Operation
User reference guide
12
RHBH/X04~16CB
ROTEX HPSU low temperature Bi‑bloc
4P384968-1B – 2017.04
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 reheat mode, you can do the following:
You can… Location
Read out the desired reheat temperature. DHWtank
temperature
home page
Adjust the reheat temperature.
Condition:
is displayed on the DHWtank
temperature home page.
Activate the DHWtank booster mode.
(Only for RHBH/X)
Program a booster heater allowance schedule
to restrict when the booster heater can operate.
Example: Only allow the booster heater to
operate during the night.
Menu structure
(Only for field supplied domestic hot water
pump for secondary return)
Program a domestic hot water pump schedule
to determine when to turn ON and OFF the pump.
When turned ON, the pump runs and makes sure
hot water is instantly available at the tap. To save
energy, only turn ON the pump during periods of
the day when instant hot water is necessary.
See also:
▪ "4.5.5Using the DHWtank temperature home page"on page13
▪ "4.5.6Using the DHWtank booster mode"on page13
▪ "4.7Preset values and schedules"on page17
4.5.3 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
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: 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 mode, you can do the following:
You can… Location
Read out the active or next scheduled desired
temperature.
DHWtank
temperature
home page
Overrule the active or next scheduled desired
temperature.
Condition:
is displayed on the DHWtank
temperature home page.
Activate the DHWtank booster mode.
Select a DHWtank temperature schedule. Menu structure
Program a DHWtank temperature schedule.
Define preset values that are used by the
DHWtank temperature schedule.
(Only for RHBH/X)
Program a booster heater allowance schedule
to restrict when the booster heater can operate.
Example: Only allow the booster heater to
operate during the night.
(Only for field supplied domestic hot water
pump for secondary return)
Program a domestic hot water pump schedule
to determine when to turn ON and OFF the pump.
When turned ON, the pump runs and makes sure
hot water is instantly available at the tap. To save
energy, only turn ON the pump during periods of
the day when instant hot water is necessary.
See also:
▪ "4.5.5Using the DHWtank temperature home page"on page13
▪ "4.5.6Using the DHWtank booster mode"on page13
▪ "4.7Preset values and schedules"on page17
4.5.4 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

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