Siemens RDG200KN, Basic Documentation, Page: 74 / 150

Functions
Control sequences
4
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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 [ ➙ 129].
4.7.10 Compressor applications
For compressor applications,
● Set the corresponding basic application as per Application overview [ ➙ 37].
● Disable the fan (P350) or set the type of fan speed (P351)
● Select the type of control outputs (On/Off, P201, P203, P204)
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
[ ➙ 59]
H ( \ )
C ( / )
1-stage compressor
with reversing valve
2-pipe 2-pipe fan coil unit
[ ➙ 59]
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
[ ➙ 60]
El. H + H ( ↯ \ \ )
El. H + C ( ↯ \ /)
C ( / )
1-stage compressor
for heating and
cooling
4-pipe
4-pipe fan coil unit
[ ➙ 66]
H + C ( \ / )
2-stage compressor 2-stage heating or
cooling
2-pipe/2-stage
heating or cooling
[ ➙ 64]
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