Boiler Group 'A - Baxi 7703233 Installation, Commissioning And User Instructions

Outdoor Sensor Kit (QAC34)
Fig. 3
M2 low voltage
terminal strip
X400
Combi Water
Pressure Switch &
DHW NTC
Brown Wires from
New Harness
Fig. 10
7703237-01 (3/18)
Fig. 5
Combi Hall
br
Effect Sensor
br
Fig. 6
Fig. 7
Fig. 8
1
br
2
3
br 4
5
(X400)
6
7
8
5.0
1. Ensure that the electrical supply to the boiler is
isolated. Undo the screws securing the facia and lift
off the front panel. Allow the facia to drop down (Fig.
3).
2. Undo the screws securing the cover and release
the cover retaining barbs from their slots. Disengage
the rear of the cover from the facia hinge pin and lift
the cover away (Fig. 4).
3. Do not touch the PCB unnecessarily, and take
Fig. 4
care when removing and fitting connectors.
4. Engage the M2 low voltage 8 way terminal strip
over the vertical flanges and secure with the screw
supplied (Fig. 5).
5. Disconnect the harness connector from position
X400 on the PCB (Fig. 6).
6. Disconnect the wiring from the Hall Effect Sensor,
DHW NTC and Water Pressure Switch (Figs. 7 & 8).
Retain the Hall Effect Sensor.
7. Connect the new harness supplied to position
X400 on the PCB.
8. Connect the harness terminals to the Hall Effect
Sensor, DHW NTC and Water Pressure Switch (see
Figs. 7 & 8). Refit the Hall Effect Sensor.
9. Connect the two brown wires on the new harness
to 4 & 5 on the M2 low voltage 8 way terminal strip
(Fig. 9).
10. Route
boiler, and using the cable grommet supplied pass it
through the hydraulic panel at the lower right (Fig. 10).
10. Connect the
the M2 low voltage 8 way terminal strip (Fig. 9).
There is no polarity.
11. Refit the cover, resecure the facia and door
panel.
Fig. 9
Sensor Cable
Connecting the Sensor - boiler
Group 'A'
the cable from the Outdoor Sensor to the
cable to 4 & 5 on
Outdoor Sensor
5