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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Room thermostat HCx
The input can be used to generate a room thermostat request for the selected heating
circuit.
If several inputs Hx are configured for the room thermostat to be used with the same
heating circuit, only input Hx with the highest number is used. The other inputs are not
taken into consideration (no configuration error).
Order of inputs Hx with the same room thermostat configuration:
H7, H6, H5, H4, H3, H2-EM3, H2-EM2, H2-EM1, H1.
DHW flow switch
Here, connect the flow switch of the instantaneous water heater.
DHW thermostat
Here, the DHW storage tank thermostat is connected.
In addition, the DHW sensor (5730) of the Configuration menu is to be set to
Thermostat and no connections are allowed at input B3/B38.
Limit thermostat HC
If the extension module for the heating circuit is used, an external limit thermostat (e.g.
for floor heating) can be connected to input H2 (low-voltage).
If the limit thermostat cuts out, …
- the mixing valve is closed and the pump is deactivated,
- an error message Limit thermostat HCx is delivered,
- state Limit thermostat cut out is generated.
If the function of the extension module is set to Heating circuits 1…3, and the function
of input H2 for the same module to Limit thermostat HC, the module gives consideration
to the state at input H2 in that case, for control of the relay outputs (pump and mixing
valve opening/closing).
Wiring example:
PE
N
N
PE
QX23
L
H2
M
230V
TW
Figure 92: H2 extension module
When used as a limit thermostat input, the contact type of input H2 cannot be selected.
The interpretation of Open is always Limit thermostat cut out.
The state at input H2 is transmitted to the basic unit where it is evaluated for the
generation of error messages. The input test also shows the state (Open/Closed).
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