Gas/Air Valve Setup Procedure - Potterton Promax HE Store 90 Litres Installation & Servicing Instructions Manual

4.16

Gas/Air Valve Setup Procedure

Checking the CO
2
1. The combustion (CO
maximum rate using a suitably calibrated analyser
after running the boiler for several minutes.
2. To do this it is necessary to set the boiler to
'Calibration Mode'.
3. Ensure that all external controls are calling for
heat. The actual current boiler temperature is shown
on the display.
4. Turn both temperature control knobs fully
anticlockwise, then quickly turn the DHW
temperature knob 1 / clockwise twice and back fully
4
anticlockwise.
5. The display will now alternate between 'SF' and
the current boiler temperature and both green LEDs
will flash.
6. Turn the CH temperature knob fully clockwise. As
the knob is turned the display will change, indicating
the fan speed.
7. The display will show '00', indicating maximum
rate, then revert to 'P ' alternating with the current
boiler temperature.
8. Remove the plug from the flue adaptor test point.
Insert the analyser probe and allow time for the
reading to settle.
The CO should be 8.9% ± 0.2
2
9. It is possible to alter the CO
gas valve. At maximum rate the 'Max. Rate' throttle
adjustment screw should be turned clockwise to
decrease CO , anti-clockwise to increase CO
2
a suitable hexagon key, until the correct reading is
obtained.
10. The CO must then be checked at minimum rate.
2
Turn the CH temperature knob fully anticlockwise. As
the knob is turned the display will change, indicating
the fan speed. When the display reads ' 0' the boiler
runs at minimum rate.
The CO should be 8.6% ± 0.2.
2
11. If at minimum CO is not correct please ring our
2
after sales service department.
12. The 'Calibration Function' is maintained for 20
minutes unless the maximum CH temperature is
exceeded. The function can be disabled at any time
by turning the DHW knob.
© Baxi Heating UK Ltd 2006
) may be checked at
2
by adjustment of the
2
using
2
Flue Adaptor
Test Point
Top View
Outlet Pressure Air Signal
Connection
Test Point
Inlet Pressure
Test Point
Ratio Valve
Burner
Pressure
(mb)
Min Gas Rate
0.6 - 0.8
Max Gas Rate 6.8 - 7.2
Air/Gas Signal sensing tube
connected to Fan
Offset
Adjustment
Throttle
Adjustment
Gas
CO
Rate
CO 2
(ppm)
(m 3 /hr) (%)
2 - 30
0.7 - 0.74 8.4 - 8.8
30 - 80
2.48 - 2.74 8.7 - 9.2
39