Connecting & Setting Outdoor Weather Sensor - Baxi Combi 224 Installation And Service Manual

6 Installation
Fig.38 Connect to X14
Bk
W R Br Bl
Br
Gn Bk R Gy W Vt
1 2 3 4 5 1 2 3 4 5 6 7 1 2
X12 X11 X10
J X14
X8 X7
X9
X13
On
Off
3 2 1
Fig.39 Graph of slopes
80°
75°
70°
65°
Slope 30
60°
55°
Slope 20
50°
Slope 12
45°
40°
35°
30°
25°
20°
20° 15° 10°
Fig.40 Display & control knobs
OFF MAX
OFF
RESET
OFF MAX
OFF MAX
Slope 5
44
TIMER
G/Y
Bl
Br
Bk
Bl
Br
Gy
1 1 2 3
X5 X3 X2
X1 MAINS
X6 X4 F2
N L
0.5A
230V - 50Hz
PN-0000644
Slope 5
5° 0° -5°
PN-0000645
MAX
OFF MAX OFF MAX
Slope 20 Slope 30
PN-0000646
6.4.4 Connecting & setting outdoor weather sensor
See
Please read the instructions supplied with the sensor. They give
information about positioning the sensor and routing the sensor
cable.
1. Ensure the electrical supply to the boiler is isolated. Fully undo the two
screws retaining the electical cover at the bottom of the front panel
and remove the cover.
2. Connect the sensor cable to the grey T-OUT connector (X14). There
is no polarity. Refit the cover.
3. Ensure that there is power to the boiler (though it is not necessary for
there to be any heating demand).
4. The central heating control knob should be turned clockwise until the
value which corresponds with the desired slope (as shown on the
graph) is displayed.
Important
If a Baxi uSense smart thermostat is connected to the boiler the
slope must be set using the uSense App. The boiler display will
not show the slope but will still be active.
5. Normally the display will show the current temperature of the water in
the boiler. As the knob is turned the display will show the selected
slope. For example if slope '12' is selected at an outside temperature
of 0°C the boiler flow temperature will be 80°C. Consider the type of
dwelling and discuss with the user their requirements to determine the
most appropriate curve.
6. Explain to the user how to select a different temperature slope.
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