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Blocking a device during fire alarms
The RDB160BN thermostat can be completely blocked during fire alarms. This
function can only be activated via BACnet (Binary value, 9).
If the current value has not been previously set to 0, the function forces the unit
to OFF mode and prevents it from being reactivated. In this case, the device
cannot be started via the On/Off button while this function is active.
Supply air temperature limitation function and cascade control
The analog input AI can be configured for use with a supply air temperature
limitation sensor. The thermostat automatically switches to cascade control.
There are four values for minimum and maximum air temperature limitation.
The setting range is 10 °C...50 °C and the default settings are as follows:
In cascade mode, the room thermostat works together with the supply air
temperature limitation controller using cascade control. In cascade control, the
supply of air temperature is calculated to maintain the room temperature
setpoint.
The Cascade factor consists of the supply air controller being faster than the
room thermostat. The Cascade factor (P74) acts as a divisor which affects both
the proportional band (P08) and Integration time (P09).
Example: If the Cascade factor is 3 (default) and the room thermostat has a
proportional band of 10 K and an integration time of 300 seconds, the supply air
controller receives a proportional band of 3 K and an integration time of
100 seconds. In other words, the supply air controller is three times faster than
the room thermostat.
Window state
The thermostat stops heating and cooling control. The fan turns off unless mold
protection or cooling of an electric heater has been selected. The potential-free
window contact is connected to inputs DI or U1 and must be configured via
parameters P03 and P14.
Window state mode is sent via BACnet.
Setpoint limitation
For energy saving purposes, the setpoint setting offset can be limited via
parameter P34 (upward) and parameter P35 (downward).
4.3 Control sequences
4.3.1 Overview
The main control sequence (e.g. the water coil sequence of the fan coil unit)
can be set via parameter P02.
The following sequences can be activated in the thermostats. The available
sequences depend on the application, which is selected via parameter P01.
For detailed information about the applications refer to chapter 'Applications
[➙ 11]'.
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