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11 - OPERATING
11.9 - Checking
and adjusting CO2
levels
Section 14 lists the correct CO2
ranges for a boiler running at normal
operating conditions at an altitude
below 3000 ft (1000m). CO2 values
outside of the ranges given in section
14 may lead to malfunctioning of the
boiler and cause it to prematurely fail.
To check the CO2 value, carry out a
combustion analysis as follows while
referencing fi gure 35:
1. carefully remove items "E", "D" and
"C" from the combustion air/ vent
fi tting:
2. generate a call for heat or, if this is
not possible, fully open a hot water
faucet;
A = air probe
B = fl ue gases probe
C = O-ring gaskets
D = probes cap
E = fi xing screw
Figure 35
- Combustion
analysis probes
3. press the
and
for more than 10 seconds, the
display will show a blinking
4. press the
key until the
display shows
if a call for
heat has been generated or until
is displayed if a domestic hot
water demand has been generated.
The boiler will now run for 10
minutes at low fi re input.
5. wait 2 to 3 minutes for the CO2 to
stabilize;
6. insert the probe of a calibrated
combustion analyzer into port "B"
and take a fl ue gas sample;
7. compare the CO2 reading with
the low fi re range given in section
14 making sure to use the range
for the gas type in use. If the CO2
reading is outside the specifi ed
range, it must be adjusted.
To adjust the low fi re CO2 proceed as
follows:
1. use a screwdriver to remove the
gas valve cap, item "F" in fi gure 32;
2. turn the regulator screw found
under cap "F" clockwise to increase
the CO2, counter-clockwise to
decrease the CO2;
3. turn the regulator screw in small
increments and wait for the CO2 to
stabilize to prevent overshooting
the desired value:
4. replace the gas valve cap, item "F"
in fi gure 32;
5. seal screw "F" with red paint or nail
polish to discourage tampering.
WARNING!!! Compare also CO
(carbon monoxide) reading, with
the value given in section 14. If this
is higher STOP the boiler and call
the service department (see phone
number on the last cover page)
Now check and, if necessary, adjust
high fi re CO2:
6. press the
key until the
display shows
heat has been generated or until
is displayed if a domestic hot
water demand has been generated.
The boiler will now run for 10
minutes at high fi re input;
42
7. wait 2 to 3 minutes for the CO2 to
keys
stabilize;
8. insert the probe of a calibrated
combustion analyzer into port "B"
;
and take a fl ue gas sample;
9. compare the CO2 reading with the
high fi re range given in section
14 making sure to use the range
for the gas type in use. If the CO2
reading is outside the specifi ed
range, it must be adjusted.
To adjust the CO2 proceed as follows:
1. use a screwdriver to turn screw "E"
shown in fi gure 32;
2. turn screw "E" clockwise to reduce
the CO2, counter-clockwise to
increase the CO2;
3. turn screw "E" in small increments
and wait for the CO2 to stabilize to
prevent overshooting the desired
value:
4. seal screw "E" with red paint or nail
polish to discourage tampering.
5. press the
the boiler to its normal operating
mode.
WARNING!!! Compare also CO
(carbon monoxide) reading, with
the value given in section 14. If this
is higher STOP the boiler and call
the service department (see phone
number on the last cover page
NOTE: During the 10 minutes
override mode, if the demand
on the boiler is low causing the
fl ue gas temperature to increase
rapidly, boiler will go into lock out
code L06. To reactivate it, press
if a call for
button to return
button.
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