Technical information

40
This will allow the digital display to indicate the
‘flashing’ fan speed on the appliance fascia.
In the fully clockwise position the display should
be indicating the maximum fan speed of the
appliance, 41±1 for 18 HE and 57±1 for 30 HE).
Check the CO2 value, corresponds to the value
in table 4.
NOTE: With the inner casing panel fitted the
combustion readings will increase slightly.
If adjustment proves necessary then proceed as
follows.
NOTE: For adjustment of appliances on LPG refer
to LPG conversion on page 30.
Any adjustment to the gas valve should only be
carried out by a competent person.
Refer to diagram 10.3.
Adjust the maximum rate CO2 with the throttle to
the value stated in table 4. (Rotate anti-clockwise
to increase).
Rotate the ‘service’ potentiometer fully anti-
clockwise. Hold it in this position for about 5
seconds before rotating the service potentiometer
clockwise to the mid-point or 3 o’clock position.
The fan should reduce to 1200 ±100 rpm which
will flash ‘12’ on the digital display.
Check the CO2 value which should correspond
to the value in table 4.
If adjustment proves necessary then proceed
as follows.
Adjustment of the CO2 at minimum rate is very
coarse so carefully adjust the CO2 with the offset
adjustment to the value stated in table 4, see
diagram 10.3.
Rotate the ‘service’ potentiometer fully clockwise,
see diagram 11.7, and recheck the maximum rate
combustion, which should be the value stated
in table 4.
After checking combustion rotate the ‘service’
potentiometer fully anti-clockwise so that the digital
display indicates the water temperature.
Replace the cap on the sampling point and refit
the control cover rear panel.
TABLE
4
18 HE
BURNER %CO
2
Case Off 9.1 + 0.2 - 0.5
BURNER %CO
2
Case On 9.3 + 0.3 - 0.5
MIN. MAX.
APPROXIMATE m
3
/h 0.53 2.0
GAS RATE
(after 10 mins. ft
3
/h 18.7 70.06
from cold)
30 HE
BURNER %CO
2
Case Off 9.1 + 0.2 - 0.5
BURNER %CO
2
Case On 9.3 + 0.3 - 0.5
MIN. MAX.
APPROXIMATE m
3
/h 0.56 3.02
GAS RATE
(after 10 mins. ft
3
/h 19.8 107
from cold)
30 HE LPG
BURNER %CO
2
Case Off 10.5 + 0.3 - 0.7
BURNER %CO
2
Case On 10.7 + 0.3 - 0.7
MIN. MAX.
APPROXIMATE m
3
/h 0.56 3.02
GAS RATE
(after 10 mins. ft
3
/h 19.8 107
from cold)