
X12 connector
Description
SO+/SO- input
Connection of an electrical energy meter
Condensation ter
minals
Connection of a condensation sensor for under
floor cooling
6.9.1
Connecting an on/off or modulating thermostat
The on/off or modulating thermostat is connected to the R-Bus terminals
on the EHC–05 PCB or the optional SCB-10 PCB.
The PCBs are delivered with a bridge on the R-Bus terminals.
The R-Bus input can be configured to add the flexibility of using several
types of on/off thermostat or OpenTherm (OT).
1. Configure the parameters for the circuit concerned:
Tab.35 Configuration of the R-Bus input for using an on/off thermostat (dry contact)
Access
Parameter
Description
21.7
CIRCA0,
19.8
CIRCA1, CIRCB1
or CIRCC1 >
Parameters,
counters, signals >
Parameters
OTH LogicLev
contact (CP640,
CP641, CP643)
Configuration of the on/off input contact direction for heating mode.
Closed (default value): heating demand when contact is closed
Open: heating demand when contact is open
RevContactOTH
cool (CP690,
CP691, CP693)
Reversal of the direction of the logic in cooling mode compared to heating mode
No (default value): cooling demand uses the same logic as the heating demand
Yes: cooling demand uses the reverse logic to the heating demand
Tab.36 OTH LogicLev contact and RevContactOTH cool parameter settings
Value of the OTH LogicLev
contact parameter (CP640,
CP641, CP643)
Value of the RevContactOTH
cool parameter (CP690,
CP691, CP693)
Position of the on/off contact
for heating
Position of the on/off contact
for cooling
Closed (default value)
No (default value)
Closed
Closed
Open
No
Open
Open
Closed
Yes
Closed
Open
Open
Yes
Open
Closed
6.9.2
Configuring a thermostat with a heating/cooling control
contact
The AC thermostat (air conditioning) is always connected to the R-Bus
and BL1 terminals on the EHC–05 PCB. The AC thermostat is only
compatible with configurations with a single heating circuit.
Priority will be given to the AC thermostat input over the other Summer/
Winter modes (Auto/Manual).
The PCBs are delivered with a bridge on the R-BUS terminals.
1. Connect the AC thermostat to the BL1 input on the EHC–05 PCB.
1 EHC–05 PCB
2 Room unit
3 Output: On/Off
4 "Heating/cooling contact" output
On
Fig.56
MW-1001290-1
22°
3
2
4
1
R-Bus
BL1
6 Installation
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