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
Handling system faults
4
A6V12166490_en--_c
45 | 58
4.11 Handling system faults
If the room temperature exceeds or drops below the measuring range, i.e. above
49 °C or below 0 °C, the limiting temperatures blink, e.g., 0 °C or 49 °C .
In addition, the heating output is activated if the current setpoint is not set to Off,
the thermostat is in heating mode and the temperature is below 0 °C.
For all other cases, no output is activated.
The thermostat resumes Comfort mode as soon as the temperature is within the
measuring range.
In the event of a power failure, all working conditions (operating mode, setpoint, fan
stage, all control parameter settings) are stored without time limitation. When
power returns, user and parameter settings can be retained with power loss and
operating mode can be returned to previous operating mode, Comfort or Protection
(depends on P27).
For thermostat with Auto Timer, see Auto Timer [➙ 42].
4.12 Infrared remote control
Use IRA211 infrared remote control to operate a controller with built-in infrared
receiver. The following operations can be done remotely:
● Select operating modes Protection, Comfort or Auto Timer
● Adjust setpoint in Comfort
● Select fan modes automatic or manual
A buzzer in the thermostat indicates remote control command reception.
Infrared remote control can be disabled via P70.
4.13 Control parameters
To optimize control performance, a number of control parameters can be
readjusted on the thermostat via HMI.
In the event of a power failure, all control parameter settings are retained.
The control parameters are assigned to 2 levels:
● Service level, and
● Expert level, including communications, diagnostics and test
The Service level contains a small set of parameters to set up the thermostat for
the HVAC system and to adjust the user interface. These parameters can be
adjusted any time.
The parameters at the Expert level need careful configuration because they impact
the thermostat’s control performance and functionality.
Temperature out of
range
Power failure