7 Commissioning [specialist]
20
99640141x-mub-en - V02
2017/07
7.4
Adjustment of the temperature
Set the desired (maximum) domestic hot water temperature at the controller under
"Main menu / Hot water / T HW nom." (see controller instructions, page 19).
WARNING
Danger of scalding due to hot water!
In order to avoid scalding at the tap, the maximum domestic hot water
temperature set at the controller must not exceed 60 °C.
Primary side
The required temperature on the primary side in the buffer tank depends on the desired
domestic hot water temperature and on the required tap quantity. The temperature in the buffer
tank must be at least 5 K above the desired domestic hot water temperature.
Secondary side
The possible withdrawal flow rate [l/min] at the tap depends on the domestic hot water
temperature adjusted at the controller and on the temperature available in the buffer tank.
The recommended maximum domestic hot water flow rate through the domestic hot water
module is ~42 l/min.
The following table illustrates the correlation between the storage tank temperature and the
maximum withdrawal flow rate at a water temperature of 45 °C at the tap (f. ex. single lever tap).
If the domestic hot water temperature set at the controller is above 45 °C, the tap flow rate
consists of a mixture of hot and cold water.
The indicated heat transfer capacity is necessary to heat up the water quantity of the withdrawal
flow rate [l/min] from 10 °C to 45 °C.
