4.15 Control parameters
To optimize control performance, a number of control parameters can be
readjusted on the thermostat via HMI, commissioning/operating tool, or Siemens
smartphone application PCT Go. These parameters can also be set during
operation without opening the unit.
In the event of a power failure, all settings for control parameter, setpoint, operating
mode and changeover value 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 both left and right buttons simultaneously for 3 seconds or until the
device beeps if the buzzer 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 both left and right buttons simultaneously for 3 seconds or until the
device beeps if the buzzer is enabled (P030).
Release and within 0.5…4 seconds, press the left button again until the
temperature display 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); the current value of the selected parameter begins to flash and
can be changed by turning the rotary knob.
4. Press (OK) to confirm the adjusted value or press (Esc) to cancel the
change.
5. If you want to adjust additional parameters, repeat steps 2…4.
6. Press (Esc) to exit 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.
8888 is then displayed 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.
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