Siemens RDG2 KN Series Basic Documentation

Functions
Control sequences
4
96 | 180
A6V11545892_en--_c
To limit the medium mix (heating and cooling medium), the changeover and the
control signal (DC 0…10 V) both work in sequence.
When control sequences change, the thermostat closes the combi valve and
releases the corresponding relay to operate the ball valve.
A delay of 120 seconds is needed before the combi valves can be operated by
the thermostat.
When the relay to ensure the ball valve is in the right H/C position, the control
signal for the combi valve is released.
If the thermostat is set with control sequence "H/C ceiling with PICV and 6-port ball
valve for changeover":
● For PICV control, only output Y10 can be used to control the combi valve.
● For 6-port ball valve as changeover :
– Relay Q1 is energized, if "Heating sequence active" (P400 = 5, fixed,
cannot be changed)
– Relay Q2 is energized, if "Cooling sequence active" (P401 = 6, fixed,
cannot be changed)
The wiring diagram of the application H/C ceiling with PICV and 6-port ball valve
for changeover is available in Connection diagrams [➙ 156].
4.7.10 Compressor applications
For compressor applications,
● Set the corresponding basic application as per Application overview [➙ 42].
● Disable the fan (P350) or set the type of fan speed (P351)
● Select the type of control outputs (On/Off, P201, P203, P204, P205)
The following applications are available:
Application for compressor in
DX-type equipment
Basic application
Section
Sequences
1-stage compressor
2-pipe
2-pipe fan coil unit
[➙ 78]
H ( \ )
C ( / )
1-stage compressor with
reversing valve
2-pipe
2-pipe fan coil unit
[➙ 78]
H + C ( \ / )
1-stage compressor and electric
heater
(cooling only: disable electric
heater via P027)
2-pipe with electric
heater
2-pipe fan coil unit
with electric heater
[➙ 79]
El. H + H ( ↯\ \ )
El. H + C ( ↯\ /)
C ( / )
1-stage compressor
for heating and cooling
4-pipe
4-pipe fan coil unit
[➙ 88]
H + C ( \ / )
2-stage compressor
2-stage heating or
cooling
2-stage heating
and cooling [➙ 83]
H + H ( \ / )
C + C ( / / )
Minimum On/Off time:
Fan operation:
Fan speed:
Control outputs On/Off:
Control outputs DC 0...10 V:
P212/P213 (only with On/Off control outputs)
P350 (0 = disabled, 1 = enabled)
P351 (1 = 1-speed, 2 = 3-speed,
3 = DC 0...10 V)
P201 = 4 (V1) P203 = 4 (V2) (DC 0…10 V fan
only)
P201 = 5 (V1) P203 = 5 (V2)
Control output
Note

Siemens RDG2 KN Series Specifications

General

Brand	Siemens
Model	RDG2 KN Series
Category	Thermostat
Language	English