Combustion Check - Potterton HE Plus Installation & Service Instructions Manual

Central Heating
Temperature Control
Display
Selector Switch
Reset
Central Heating
Temperature Control
Fig. 89
Fig. 91
Flue Adaptor Test
Point
Plug
Analyser Probe
Min Rate
Adjustment Screw
(cap fitted)
© Baxi Heating UK Ltd 2007
Calibration
Fig. 88
Control
1
0
Calibration Control
Fig. 90
Fig. 92
Fig. 94
Max Rate
Adjustment Screw
(cover removed)
Fig. 95
Supplied By www.heating spares.co Tel. 0161 620 6677
15.1
x 2
1. The combustion (CO
boiler for several minutes. To do this it is necessary to set
the boiler to 'Calibration Mode'.
2. Ensure that all external controls are calling for heat. The
actual current boiler temperature is shown on the display.
3. Turn both temperature control knobs fully anticlockwise,
then quickly turn the Calibration Control knob
twice and back fully anticlockwise (Fig. 88).
4. The display will now alternate between 'SF' and the
2
3
current boiler temperature and both green LEDs will flash
4
bar
(Figs. 89 & 90).
5. Turn the CH temperature knob fully clockwise. As the
knob is turned the display will change, indicating the fan
speed.
6. The display will show '00', indicating maximum rate, then
revert to 'P ' alternating with the current boiler temperature
(Figs 91, 92 & 93).
7. Remove the plug from the flue adaptor test point. Insert
the analyser probe and allow time for the reading to settle
(Fig. 94).
8. It is possible to alter the CO
valve. Remove the plastic cover from the 'Max Rate'
adjustment screw. At maximum rate the 'Max. Rate'
adjustment screw should be turned, using a suitable
hexagon key, until the correct reading is obtained (Fig. 95).
Fig. 93
Turning clockwise will reduce the CO
increase the CO
9. The CO
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.
10. With the boiler on minimum, the 'Min. Rate' adjustment
screw must be altered, using a suitable hexagon key, after
removing the cap (Fig. 95). Turning anti-clockwise will
reduce the CO
is reset at either boiler rate it must be rechecked at the
other rate and also adjusted if required.
11. 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
Calibration Control knob.
Gas Valve

15.0 Combustion Check

Checking the CO
2
IMPORTANT: The CO must be only be checked and
2
adjusted if a suitable calibrated combustion analyser is
available.
) may be checked after running the
2
The CO should be 8.7% ± 0.2
2
by adjustment of the gas
2
2.
must then be checked at minimum rate. Turn
2
The CO should be 8.4% ± 0.2.
2
. Clockwise will increase the CO
2
1 / clockwise
4
. Anti-clockwise will
2
If the CO
2. 2
45