Siemens LMS14 User Manual

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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
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. Operating line
HC1 HC2 HC3
742 1042 1342 Flow temp setpoint room stat
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
Functions with room thermostat
The following table gives an overview of the room functions and their modes of
operation when using a room thermostat:
Function Description
Automatic summer/winter
changeover
As parameterized; function is not available without outside sensor
24-hour heating limit As parameterized; function is not available without outside sensor
Boost heating As parameterized; ended when room thermostat switches to the Warm state
Quick setback 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
Optimum start/stop control As parameterized; function is not available without outside sensor
Room influence As parameterized and according to the current room temperature, if room
influence is active
Room limitation As parameterized; function is not available without room sensor
Adaption
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
Flow temp setpoint
room stat

Siemens LMS14 Specifications

General

Brand	Siemens
Model	LMS14
Category	Control Unit
Language	English