Data Sheet for Product

6
Siemens A6V11881086_en--_b
Smart Infrastructure 2020-05-20
Commissioning
After powering up, the thermostat resets and all LCD segments light up for about 3 seconds.
Afterwards, the room temperature is displayed (factory setting) and the unit is ready for
commissioning by qualified HVAC staff.
The thermostat’s control parameters can be adjusted to ensure optimum performance of the
entire system (see “Parameter settings”).
Surge protection at power-up
When the thermostats are powered up, LCD display and key buttons work normally except
all valve outputs, e.g., Y12, Y14.
The outputs of thermostats start up at random to protect the mains from overload. It may
take up to two minutes before all outputs of thermostats work properly.
Sensor calibration
The thermostat has an internal sensor for accurate temperature display. If the temperature
display is influenced by its installation location, calibrate the sensor via parameter P05 to
adjust the readings.
Setpoint and range limitation
For comfort and energy saving reasons, we suggest to review the setpoints and setpoint
ranges (parameters P09, P10, P65 and P66) and change them as needed.
Control sequences
On/Off control
On 2-pipe applications, the thermostat controls an On/Off valve in heating/cooling mode
(P01 = 0, factory set).
RDD510
Heating mode Cooling mode
T[°C] Room temperature SDH Switching differential “Heating”
W Room temperature setpoint SDC Switching differential “Cooling”
YH Control command “Valve” (heating) YC Control command “Valve” (cooling)
On/Off control signal
The valve receives the On command via control output Y14 when:
1. The acquired room temperature is below the setpoint (for heating mode) or above the
setpoint (for cooling mode), and
2. The control output was not energized for more than the “Minimum output off time”
(factory setting 1 minute)
The valve receives the Off command when:
1. The acquired room temperature is above the setpoint (for heating mode) or below the
setpoint (for cooling mode), and