7 Commissioning [specialist]
22
99640766x-mub-en – V03
2014/11
7.4
Setting the temperature
Set the desired (maximum) domestic hot water temperature at the controller under "Para"
(see controller instructions, page 24).
WARNING
Danger of scalding due to hot water!
The maximum domestic hot water temperature must not exceed 60 °C in order
to avoid scalding at the tap.
Primary circuit
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 set at the controller and on the temperature available in the buffer tank.
The maximum domestic hot water flow rate through the module FriwaMega is of 130 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 withdrawal flow
rate consists of a mixture of hot and cold water.
The indicated heat transfer capacity is necessary to heat up the water to be withdrawn [l/min]
from 10 °C to 45 °C.
