Baxi MainEco Combi 24 Installation And Service Manual page 39

Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
4 3 2 1 3 2 1 6 5 4 3
Enable Status
+ - + -
CH DHW Nc C No Tout Tdhw BL
4 3 2 1 3 2 1 6 5 4 3
Enable Status
+ - + -
CH DHW Nc C No Tout Tdhw BL
02092014 - 7619497-02
2 1 2 1
BUS BUS
On/off
HMI
SCU OT
R000718-A
2 1 2 1
BUS BUS
On/off
SCU HMI
OT
R000448-A
n Connect on/off contact (Enable)
A 10-230 V signal can be connected to the CH and DHW connectors
to switch the production of heating water or sanitary warm water on
or off.
4 + = L
4 - = N
DANGER
If the power to the boiler is interrupted, a voltage will still
be present at connectors CH and DHW.
When using the Enable-CH connection a bridge must be
placed on the On/off-OT terminals of the connector.
The production of heating water or domestic hot water is
switched on as standard. The automatic control unit will
only respond to the switch and control the heating/
domestic hot water function once a 10-230 V signal has
been connected to the connectors. If the power to the boiler
is interrupted, the status of the CH and DHW input will be
reset to the factory setting (= enabled). Check whether this
is the status required.
n Connecting control panel
The control panel for the boiler is connected to connector BUS HMI.
¼See chapter: "Access to the connector block / Boiler HMI", page
34
5. Installation
37