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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Instantaneous water heater with primary heat exchanger
In the case of instantaneous water heaters with primary heat exchanger, the heat
exchanger is heated up directly by the burner’s flame. Hence, there is no heat transfer
from the boiler water to the DHW.
When DHW is consumed, the burner is controlled depending on the DHW outlet
temperature (sensor B38). The burner is switched on when the DHW outlet temperature
lies one switching differential below the setpoint of consumption. The burner is switched
off again when the DHW outlet temperature exceeds the setpoint by the current switch-
off differential. The switch-off differential is calculated dynamically, based on the
parameterized minimum and maximum switch-off differential.
When DHW is consumed, the burner’s output is controlled depending on the DHW
outlet temperature (sensor B38), but the boiler temperature is limited. Parameter Boil
temp out red (2527) is used to set the temperature limit. The associated switching
differential is set via parameter Swi diff output red (2528).
Line no. Operating line
1610 Nominal setpoint
2460 Switching diff on DHW
2461 Switching diff off min DHW
2462 Switching diff off max DHW
2463 Settling time DHW
2527 Boil temp out red
2528
Swi diff output red
5020 Flow setpoint boost
Line no. Operating line
8003 State DHW
8852 DHW consumption temp
8853 Instant WH setpoint
The Keep hot function is not available with instantaneous water heaters equipped
with a primary heat exchanger.
DHW consumption
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