Combustion analysis 16
Instructions for Use, Installation and Servicing ecoMAX pro
27
16 Combustion analysis
Note!
The boiler is fitted with a combustion analysis
test point. A suitable combustion analyser can
be connected to this point to establish the com-
bustion performance of the boiler.
It is not necessary to check the CO
2
content or adjust
the air ratio of the boiler during initial commissioning or
for the annual service.
Checking/adjustment of this value is only required in the
following instances; replacement of gas valve or fan,
conversion from Natural Gas/ LPG or if incorrect combu-
stion is suspected.
To carry out a combustion check, connect a CO
2
combu-
stion analyser to the test point on the flue adaptor. Turn
on the gas service cock.
Turn on the electrical supply, and slide the on/off control
down to the ‘I’ position to turn on the boiler. Set the
timer to continuous and turn up any room thermostats
to call for demand.
With the boiler interface in normal operating mode,
press and hold the ‘mode’ button (
) for 10 seconds
until a flashing ‘0’ appears.
Fig. 16.1
Press the ‘-‘ key and scroll through until ‘96’ (installer
mode) is shown on the screen, then press the ‘mode’
button again.
Fig. 16.2
Press the ‘+‘ key and scroll through until ‘8’ is shown on
the left of the screen, then press the ‘mode’ button
again.
Fig. 16.3
Set the appliance fan speed/burner to maximum by
pressing the ‘+’ key until ‘2’ (burner to Pmax) is shown
on the right hand side of the screen. Press the ‘mode’
button again to confirm.
Check the CO
2
value, which should be 8.8 %
±
0.2 %.
Note that with the inner case front panel fitted the com-
bustion reading will increase slightly to
9.0 %
±
0.2 %. Allow the boiler time to reach the maxi-
mum rate (approximately 5-10 minutes).
If adjustment proves necessary then proceed as follows.
Any adjustment to be the gas valve should only be car-
ried out by a qualified person. Adjust the maximum rate
CO
2
with the (‘A’) throttle using a screwdriver to 8.8 %
(rotate anti-clockwise to increase).
Fig. 16.4
"A" throttle –
"Pmax" rotate to increase
"B" offset adjustment
"Pmin" rotate to increase