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
.
¼
See chapter: "Access to the connector block / Boiler HMI", page
34
R000718-A
1
2
3
4
5
6
3
4
1
2
1
2
1
2
3
On/off
OT
Enable
+
-
+
-
CH
DHW
Status
Nc C No
Tout Tdhw BL
SCU
BUS
BUS
HMI
R000448-A
1
2
3
4
5
6
3
4
1
2
1
2
1
2
3
On/off
OT
Enable
+
-
+
-
CH
DHW
Status
Nc C No
Tout Tdhw BL
SCU
BUS
BUS
HMI
Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
5. Installation
02092014 - 7619497-02
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