User Manual

Page 32 Unrestricted 0 – Siemens Smart infrastructure
Product Bundle (D): FCU, chilled/heated ceiling via KNX thermostat
Operation
Operating modes
Comfort
The operating mode when the room is occupied must be Comfort.
Economy
Economy must be the present operating mode in a room that is unoccupied for a longer
period (e.g. planned night setback).
Protection
The operating mode when the building is unoccupied (for example, during holiday periods)
for any extended period of time must be Protection. The operating mode Protection must
protect the building against overheating or cooling down too much.
Determine operating mode
Local
Presence detector: The thermostat switches to Comfort mode when the presence detector is
active (room occupied).
Central and local
Room occupancy time schedule: The room operating mode is determined by a time schedule
and is commanded via the communication bus. The scheduler must be used on the
automation or management level and specifies the operating mode. The room temperature
must be controlled to the setpoint defined for these states.
Presence detector: If presence is detected, the room operating mode determined by the time
schedule is overridden and the Comfort mode is activated.
Room equipment
Room thermostat
The thermostat must be able to:
• Measure the room temperature and maintain the setpoint
• Measure the room humidity and maintain the pre-programmed setpoint
• Receive a signal from a presence detector and switch thermostat into Comfort mode
• Provide the user with the following:
• Local operation to change setpoint for temperature
• Manual selection of room operating mode/occupancy
• LCD display for room/outside temperature, humidity, operating modes, fan speed