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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
To detect DHW consumption in the case of the instantaneous water heater, a flow
switch can be connected. To ensure that DHW consumption is reliably detected, it may
be necessary for the flow switch to respond for a certain minimum time, which can be
parameterized. For this purpose, parameter Flow switch time cons (5482) is available.
Setting 0 means that DHW consumption is detected the very same moment a change
of state occurs.
The flow switch can be in the form of a switching contact or rate-of-flow meter.
Line no. Operating line
5482 Flow switch time cons
A flow switch in the form of a switching contact can be connected to input H1, H3, H4,
H5, H6 or H7. Due to their long response time, inputs H2 on the extension modules are
not suited as inputs for a DHW flow switch. For this purpose, this input is to be
configured as a DHW flow switch via one of the function inputs Hx (Function input H1
(5950), Function input H3 (5960), Function input H4 (5970), Function input H5 (5977),
Function input H6 (6008) and Function input H7 (6011)).
Line no. Operating line
5950 Function input H1
5960 Function input H3
5970 Function input H4
5977 Function input H5
6008 Function input H6
6011 Function input H7
A flow switch in the form of a rate-of-flow meter can be connected to input H4
(frequency input). For that, the input is to be configured via parameter Function input
H4 (5970) as DHW flow switch. Also, the characteristics of the rate-of-flow meter are to
be defined via 2 pairs of value consisting of a frequency value and a function value. The
resolution for the function value is 100 ml/min. This means that for a flow rate of 2 l/min,
the function value to be set is 20. Menu DHW flow heater (instantaneous water heater)
contains parameter Threshold flow detection (5444) which is used to enter the
threshold above which the flow rate indicates DHW consumption. In addition, parameter
Switching diff flow detection (5445) is to be used to enter the hysteresis as a switching
differential. The rate-of-flow meter is to be selected as flow switch via parameter Flow
supervision [4196.1] of the Boiler menu.
Line no. Operating line
5444 Threshold flow detection
5445 Switching diff flow detection
5970 Function input H4
5973 Frequency value 1 H4
5974 Function value 1 H4
5975 Frequency value 2 H4
5976 Function value 2 H4
[4196.1] Flow supervision
Both types of flow switch can be used simultaneously. In that case, DHW consumption
is detected via an OR operation of both inputs. For detection, it is sufficient if one of the
2 inputs indicates consumption. When the end of DHW consumption is reached, none
of the 2 inputs must indicate consumption.
Flow switch
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