Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Heating/cooling changeover 03.10.2011
27.4 Display current state
The current state is displayed in menu "Heating/cooling ch'over":
Main menu > Heating/cooling ch'over >
Operating line Comments
2-pipe heating/cooling system Heating, Cooling
27.5 Heating/cooling changeover relay
If the H/C signal is not to be sent to the bus but rather to 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 >
Operating line Range Factory setting
Heating/cooling ch'over relay ---, N.Q1, N.Q2,…/ ---
The current state of the changeover relay can be queried:
Main menu > Heating/cooling ch'over >
Operating line Current 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 >
Operating line Comments
Heating/cooling ch'over relay "Off": Cooling / "On": Heating
27.6 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.
No. Text Effect
5801 H/C changeover
signal failure
Non-urgent message; must not be
acknowledged
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, fault message "> 1 heat/cool changeover signal" is generated in
a 2-pipe system.
No. Text Effect
5802 >1 heat/cool
changeover signal
Non-urgent message; must be acknowledged
Configuration
Display values
Wiring test
Behavior
Fault status message
Behavior
Fault status message