Heat Generator Minimum Temperature Limit; Heat Circuits Minimum Temperature Limit - Rotex Controller Series Product Documentation

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8.1.2 Heat Generator Minimum Temperature Limit (..2.., ..22.., ..C..)
Function: In order to protect the heat generator against agressive condensate the minimum
temperature limit documented by the manufacturer of the heat generator is to be set.
The heat generator switches on when the temperature falls below the set value, while
it switches off when the set value plus the burner switching differential is exceeded.
During heating the limit temperature will be maintained
This setting is used only for the reaction of the heat generator (burner) to reaching
the set minimum temperature (KT
unchanged.
The mode of operation of the set limit is defined via the heat generator parameter
"H-GEN start-up protection".
Function
Minimum temperature
limit H-GEN: There are three different modes of operation for the minimum temperature limit:
Minimum temperature limit at heat requirement
If there is no demand from the heating or DHW, the boiler will be switched off. The
minimum limit is deactivated. If the temperature in the heat generator drops below
the heat generator frost protection temperature of +5°C, the burner will be switched
on and the heat generator is heated to the minimum temperature limit.
Conditional minimum limit
The boiler minimum temperature serves as the lower limit value and is also
maintained without demand. The boiler is only switched off when summer switch-off
is activated.
Permanent minimum limit
The boiler temperature is limited according to the set minimum temperature
regardless of the demands or the switched-off operating modes.
Operation:
8.1.3

Heat circuits minimum temperature limit

•
•
8-2
Note on operation
Setting minimum temperature
Function minimum temperature limit
If the boiler temperature BT
(BT ) the heating circuit pumps (HC-P, SOL-P, MC-P) are switched off. The
min-HC
mixer valves are closed.
If BT > BT + SD
act min-HC
and mixer valves are enabled again.
Product documentation THETA NORM/UNIT
). The function for the H-GEN remains
min-H-GEN
Key / parameter tree
HEAT GENER.
HEAT GENER.
<= parameter 27
act
(H-GEN parameter 28) the heating circuit pumps
min-HC
Parameter
PARAMETER 03
PARAMETER 05