EXTREMA
25
EN
cod. 3540S060 - 04/2010 (Rev. 00)
Combustion check
Connect the flue gas analyzer to the flue gas sampling point as shown in the fig. 34 and check combustion as described
in table 4 and table 5.
1. Press the CH button for 5 seconds to place boiler into test mode
2. Wait for 10 minutes for the boiler to stabilize fully
3. Take the measurement and record
4. Take the boiler to minimum output by pressing the CH – button, allow the boiler to stabilize for a further 10 minutes.
5. Take the measurement and record.
fig. 34 - Flue gas sampling Point
1
= Air -
2
= Fumes
Tabella. 4 - Maximum rate
Tabella. 5 - Minimum rate
If the combustion reading is greater than the acceptable value AND the integrity of the complete flue system
and combustion circuit seals have been verified and the inlet gas pressure (and gas rate) have been verified,
proceed as in section
sec. Setting the Air/Gas Ratio valve.
Setting the Air/Gas Ratio valve
There are two adjustments possible on the air/gas ratio valve, the throttle setting at maximum rate and the offset setting
at minimum rate. If either setting is adjusted the combustion values must be rechecked at both rates.
At Maximum Rate:
1. Adjust the boiler to maximum rate in sec. Test mode of cap. 3.3
2. Wait 10 minutes to allow the boiler to stabilize.
3. Now adjust the
Throttle setting
(fig. 35 - screw
A
) until the CO
2
is at the correct
SETTING LEVEL
(see table 4),
confirm that the CO/CO
2
ratio is within limits.
NOTE:
ADJUST IN STEPS OF
NO MORE THAN 1/8 OF A TURN
AND WAIT 1 MINUTE AFTER EACH ADJUSTMENT
TO ALLOW THE SETTING TO STABILISE.
In the event that the CO
2
setting level with an acceptable CO/CO
2
ratio cannot be obtained please contact the
helpline number.
Should you require any assistance during the set up procedure call our Technical service helpline or
should you
require a service engineer to visit call our service centre at numbers listed on last page of this manual.
At Minimum Rate:
1. Adjust the boiler to minimum output and allow the boiler to stabilize.
2. Now adjust the
offset pressure setting
(fig. 35 - cup
B
) until the CO
2
is at the correct
SETTING LEVEL
(see
table 5), confirm that the CO/CO
2
ratio is within limits.
NOTE: ADJUST IN STEPS OF
NO MORE THAN 1/8 OF A TURN
AND WAIT 1 MINUTE AFTER EACH ADJUSTMENT
TO ALLOW THE SETTING TO STABILISE.
1
2
1
2
NATURAL GAS ACCEPTABLE
COMBUSTION RANGE
MAXIMUM RATE AFTER 10 MINUTES FROM COLD
Boiler Model
CO/CO
2
RATIO
CO
2
NG
CO
2
LPG
EXTREMA 30 C
0.004
8,7 ÷ 9,2
10 ÷ 10,5
EXTREMA 38 C
0.004
NATURAL GAS ACCEPTABLE
COMBUSTION RANGE
MINIMUM RATE AFTER 10 MINUTES FROM COLD
Boiler Model
CO/CO
2
RATIO
CO
2
NG
CO
2
LPG
EXTREMA 30 C
0.004
8,2 ÷ 8,7
9,5 ÷ 10,0
EXTREMA 38 C
0.004
