Data Sheet for Product

8
Siemens
A6V10889950_en--_j
Smart Infrastructure
2022-01-05
2. The control output was energized for more than the “Minimum output on time”; (factory
setting 1 minute)
Note:
● Control output Y12 delivers a control command which is inverted to the control command
at output Y14 that can be used for normally open valves.
● Valve output can respond immediately and does not consider minimum On/Off time if
users manually adjust the setpoint via local HMI.
Fan operation
The fan operates either in automatic mode or at the selected speed in manual mode.
In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When the room temperature reaches the setpoint, the control valve is closed
and the fan either remains in fan speed 1 (P15=1) or switches off (P15=0).
In “Temperature-dependent” fan control, the fan switches off (see diagram below). The
individual switching differentials of the fan speed 1, 2, 3 (Q1, Q2 and Q3) can be adjusted via
control parameters P30 and P31.
Heating mode
Cooling mode
Ventilation always on
If desired, fan control can be set to “Temperature-independent”, which means that ventilation
is always on, even within the dead zone, using at least fan speed 1(P15 = 1, factory set).
See “Avoiding damage due to moisture” for more information.
Fan minimum On-time
In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fan maintains
that speed for at least 2 minutes before it switches to the next speed. This dwelling time can
be adjusted from 1…6 minutes via parameter P59.
Fan On-time is set to minimum 2 minutes before the fan is turned off. This prevents the fan
from being frequently switched between the On and Off states. The maximum duration is 6
minutes.
Fan start
When the fan starts from standstill, it starts at speed 3 for 1 second to guarantee safe fan
motor start (to overcome inertia and friction).
Error handling
Temperature out of range
Factory setting of the heating/cooling setpoint in Protection mode is Off, i.e. overheating/frost
protection is disabled.
In this case, when the room temperature is out of range, i.e. above 49 °C or below 0 °C, the
temperature displays and flashes at “0 °C” or “49 °C”, and the thermostat continues to work.
Sensor error
When the internal sensor is not working properly, “Er1” is displayed.