Basic Documentation
Table Of Contents
- 1 About this document
- 2 Overview
- 3 Notes
- 4 Functions
- 4.1 Temperature control
- 4.2 Operating modes
- 4.3 Room temperature setpoint
- 4.4 Application overview
- 4.5 Additional functions
- 4.6 Control sequences
- 4.7 Control outputs
- 4.8 Fan control
- 4.9 Multifunctional input, digital input
- 4.10 Auto Timer
- 4.11 Handling system faults
- 4.12 Infrared remote control
- 4.13 Control parameters
- 5 Connection
- 6 Technical data
- 7 Dimensions
- Index
Functions
Control sequences
4
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31 | 58
4.6.2 2-pipe fan coil unit
In 2-pipe applications, the thermostat controls a valve in heating/cooling mode with
changeover (automatically or manually), heating only, or cooling only (factory
setting, P01 = 1).
The diagrams below show the control sequence for On/Off control.
Heating mode
Cooling mode
T[°C] Room temperature
SDH Switching differential "Heating"
(P30)
w Room temperature setpoint
SDC Switching differential "Cooling"
(P31)
V1 Control command "Valve" or
"Compressor"
The diagrams below show the control sequence for modulating PI control.
Heating mode
Cooling mode
T[°C] Room temperature
XpH Proportional band "Heating"
(P30)
w Room temperature setpoint
XpC Proportional band "Cooling"
(P31)
V1 Control command "Valve"
The diagrams only show the PI thermostat’s proportional part.
To set sequence and control outputs, see Application overview [➙ 21], Overview of
sequences (setting via P01) [➙ 30] and Control outputs [➙ 36].
On/Off control
Control sequence
On/Off output
Modulating control:
3-position
Control sequence
modulating output
Note