Siemens RDG2 KN Series Basic Documentation

Functions
Additional functions
4
50 | 180
A6V11545892_en--_c
Time schedule via
Bus
Presence detector behavior
Comfort mode
When hotel guests leave their rooms (room is unoccupied),
the operating mode changes to Economy. The buttons are
locked and symbol is displayed.
Economy mode
● When hotel guests leave their rooms (room is
unoccupied), the operating mode changes to Economy.
The buttons are locked and symbol is displayed.
● When the room is occupied, the operating mode
changes to the previous operating mode.
Protection mode
Presence detection has no influence on the operating
mode.
Not available
● When hotel guests leave their rooms (room is
unoccupied), the operating mode changes to Economy.
The buttons are locked and symbol is displayed.
● When a room is occupied, the operating mode changes
to the previous operating mode.
● When the schedule changes to Economy but the presence detector is still
active, the operating mode remains in Comfort mode until the presence
detector becomes inactive.
● The contact (e.g., a card reader) can be connected to multifunctional input X1,
X2 or U1 (set P150, P153 or P155 to 10) or occupancy is sent via bus from a
KNX presence detector (only one input source must be used, either local input
X1/X2/U1 or KNX bus).
4.6.3 Output functions
The changeover sensor ensures changeover between heating and cooling mode
based on the acquired water temperature. We recommend activating the Purge
function (P251) with 2-port valves. This function ensures correct acquisition of the
medium temperature even if the 2-port valve is closed for an extended period of
time. The valve is opened for 1 to 5 minutes (adjustable) at 2-hour intervals during
off hours.
The function is valid for outputs PWM, On/Off, On/Off 3-wire, DC, 3-position and all
2-pipe applications.
Limit the On/Off switching cycle to protect HVAC equipment, e.g., compressor and
reduce wear and tear. The minimum output on-time and off-time for the On/Off
control output can be adjusted from 1 to 20 minutes via P212 and P213. The
factory setting is 1 minute.
Readjusting the setpoint or heating/cooling mode changeover immediately results
in calculation of the output state; the outputs may not hold the minimum 1-minute
On/Off time.
If P212 or P213 is set to greater than 1 minute, the minimum On/Off time for the
control output is maintained as set, even if the setpoint or changeover mode is
readjusted.
For 2-pipe and 2-stage applications with different equipment, e.g., fan coil units
and radiant heating/cooling panels, it is possible to invert the sequence of the
equipment to optimize energy use, when the thermostat changes the sequence
from heating to cooling (P001 = 2 or 3).
Under factory settings, the 1
st
stage in heating (YHC1) is also the 1
st
stage in
cooling.
The swap function optimizes use of heating/cooling energy in mixed systems. E.g.,
when the fan coil units are combined with radiant heating/cooling panels, it is better
Notes
Purge function (P251)
Minimum output On/Off
time (P212, P213)
Swap outputs for 2-pipe
and 2-stage applications
(P254)

Siemens RDG2 KN Series Specifications

General

Brand	Siemens
Model	RDG2 KN Series
Category	Thermostat
Language	English