User Manual

Functions
Control parameters
4
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4.15 Control parameters
A number of control parameters can be readjusted to optimize control
performance. This can be done on the thermostat via HMI,
commissioning/operating tool, or Siemens smartphone application PCT Go for
Android. These parameters can also be set during operation without opening the
unit.
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.
4.15.1 Parameter setting via local HMI
1. Press left and right buttons simultaneously for 3 seconds or until device beeps
if buzzer function is enabled (P030).
Release and within 0.5…4 seconds, press the right button again until P001 is
displayed.
Continue with step 2.
1. Press left and right buttons simultaneously for 3 seconds or until device beeps
if buzzer function is enabled (P030).
Release and within 0.5…4 seconds, press the left button again until the
temperature disappears.
Turn the rotary knob counterclockwise minimum ½ rotation. P050 displays.
Continue with step 2.
2. Select the required parameter by turning the rotary knob.
3. Press (OK) button; the current value of the selected parameter starts
flashing and can be changed by turning the rotary knob.
4. Press (OK) button to confirm the adjusted value or press button (Esc) to
cancel the change.
5. If you want to adjust additional parameters, repeat steps 2…4.
6. Press button (Esc) to exit the parameter setting mode.
The factory setting for the control parameters can be reloaded via P505, by
changing the value to ON. Confirm the change by pressing the right button.
Then 8888 displays during reloading and device restarts 4 s later.
If password protection (needs to be done by HVAC installer) is enabled, users
must enter the password to open parameter setting mode. If the password is
mistyped 5 times, the thermostat is locked and the password cannot be entered for
5 minutes. Symbols and are displayed.
Enter only Service level
Enter Expert level with
Diagnostics and test
Reset parameters
Note:
Adjust parameters