Room Thermostat - Siemens LMS14 User Manual

Flow temp setpoint
room stat
Functions with room thermostat
Function
Automatic summer/winter
changeover
24-hour heating limit
Boost heating
Quick setback
Optimum start/stop control
Room influence
Room limitation
Adaption
Building Technologies Division
6.5.9

Room thermostat

On applications with room thermostat, the heating is switched on only when the room
thermostat calls for heat. When the thermostat is in the Cold state, a fixed or weather-
dependent flow temperature setpoint can be selected.
Line no.
HC1 HC2 HC3
742 1042 1342
The differentiation is made via parameter Flow temp setpoint room stat (742 / 1042 /
1342):

When a setting is made, the flow temperature setpoint corresponds to the fixed
value, which can be readjusted via the room thermostat's adaption function

When no setting is made (---), the flow temperature setpoint is calculated
according to the heating curve. This offers the advantage that – as usual – the
output of the heating system can be adjusted via the heating curve slope and the
room temperature setpoint. In that case, the room thermostat's Adaption function
acts on the heating curve. If no outside sensor is connected, the value of the
heating curve at 0 °C (backup value) is used, and an error message (Outside
sensor missing) is delivered
The following table gives an overview of the room functions and their modes of
operation when using a room thermostat:
Description
As parameterized; function is not available without outside sensor
As parameterized; function is not available without outside sensor
As parameterized; ended when room thermostat switches to the Warm state
Flow temperature setpoint as parameterized:
Function is not available. Outside the Comfort phases, the heating is Off
Flow temperature setpoint according to the heating curve:
- With room sensor: As parameterized and according to the current room
temperature if room influence is active
- Without room sensor and with outside sensor: As parameterized and
according to the room model
Without outside sensor and without room sensor:
- ParQuickSetback = off  no quick setback
- ParQuickSetback = reduced  heating continuously on
- ParQuickSetback = frost  heating continuously on
As parameterized; function is not available without outside sensor
As parameterized and according to the current room temperature, if room
influence is active
As parameterized; function is not available without room sensor
The room thermostat's Adaption function can be specifically parameterized.
For that purpose, the required cycling ratio of the room thermostat must be
parameterized
Flow temperature setpoint as parameterized:  adaption of setpoint
Flow temperature setpoint according to the heating curve:  adaption of heating
curve
User Manual LMS14...
6 The settings in detail
Operating line
Flow temp setpoint room stat
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CC1U7471en
07.05.2014