Please read in conjunction with separate sheet
"Connecting External Controls".
n
Connecting modulating controller
The boiler is fitted with a
OpenTherm
connection as standard.
As a result, modulating
OpenTherm
controllers can be connected
without further modifications.
4
In the case of a room temperature thermostat or a programmable
room thermostat, fit the thermostat in accordance with the
manufacturer’s instructions.
4
Connect the two-wire cable to terminals
On/off-OT
of the
connector.
n
Connect on/off thermostat
The boiler is suitable for connecting a 2 wire on/off room thermostat
or weather compensator.
4
In the case of a room temperature thermostat or a programmable
room thermostat, fit the thermostat in accordance with the
manufacturer’s instructions.
4
Connect the 2 wire 24V room thermostat to the
On/off-OT
terminals of the connector.
4
Connect the power stealing thermostat to the
On/off-OT
terminals
of the connector.
n
Connecting the outside temperature sensor
An outside sensor can be connected to the
Tout
terminals of the
connector. In the case of an on/off thermostat, the boiler will control
the temperature with the set point from the internal heating curve.
CAUTION
Check whether the outside sensor is suitable for this
boiler. A suitable outside sensor can be obtained as an
accessory.
A OpenTherm controller can also use this outside sensor.
The heating curve required must then be set on the
controller.
Heating curve setting
If an outside temperature sensor is connected, it is possible to adapt
the heating curve. The setting can be modified using parameters
p1
,
p"5
,
p"6
and
p"7
.
This is only possible with an iSense or qSense.
R000450-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
R000450-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
R000451-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
R000038-A
0
10
20
-20
-10
10
30
70
50
90
F
Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
5. Installation
02092014 - 7619497-02
35