10.4.6 Heating/cooling changeover relay
If the H/C signal is to be sent to the bus as well as a relay output to e.g. switch a
valve or to be routed to a non-communicative device, the H/C changeover relay
can be configured accordingly.
Main menu > Commissioning > Extra configuration > Heating/cooling ch'over >
Configuration
Operating lin
e Range Fact
ory setting
Heating/cooling ch'over relay ---, N.Q1, N.Q2,… ---
The current state of the changeover relay is displayed:
Main menu > Heating/cooling ch'over >
Display values
Operating lin
e Curre
nt state
Heating/cooling ch'over relay "Off": Cooling / "On": Heating.
During wiring test, the H/C changeover relay can be switched directly.
Main menu > Commissioning > Wiring test > Outputs >
Wiring test
Operating line Comment
Heating/cooling ch'over relay "Off": Cooling / "On": Heating.
10.4.7 Troubleshooting
If the changeover signal "Heating/Cooling" is missing in a 2-pipe heating/cooling
system, the controller continues to use the last received value. If there was never a
signal, "Heating" is used as the default value.
Behavior
No. Text Effect
5801 H/C changeover signal failure Non-urgent message; must not be
acknowledged.
Fault messa
ge
Fault message ">1 heat/cool changeover signal" is generated in a 2-pipe
system if an H/C changeover input, H/C by calendar, or operating mode selector is
configured and a changeover signal from another device on the bus is received in
one of the zones.
Behavio
No. Text Effec
t
5802 >1 heat/cool changeover signal Non-urgent message; must be
acknowledged.
Fault message
162 / 216
Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies H/C demand, H/C changeover 01.04.2010
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