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9.12 Chimney Sweep Function
For correct boiler operation, content of (CO
Combustion
Table
Nominal value
Maximum
Power
Permitted
(100%)
Nominal value
Ignition
power (*)
Permitted
Nominal value
Minimum
Permitted
power (0%)
(*)
Automatically calculated from the PCB
Chimney Sweep Function enables boiler to generate maximum
heating power.
After activation, boiler power % can be adjusted from
minimum (0%) to maximum (100%) in DHW mode.
A. Press and hold
and
seconds. When the function is enabled, displays shows
"On" for few seconds followed by program row "303"
alternating with % of boiler power.
B. Press
to gradually adjust power (increments of
1%).
C. To exit press and hold,
for at least 6 seconds.
D. If value of CO
-O
is different, check the electrodes and
2
2
their relative distances. See Figure 11-1.
If necessary, replace electrodes and position them correctly.
If problem persists, use "COMBUSTION ADJUSTMENT
FUNCTION (CO
%)". See Section 11 General Maintenance,
2
Figure 11-1 Electrodes. If problem persists, use Section 9.8
Automatic Calibration Function, and Section 9.9 Manual
Calibration Function.
NOTICE
• Press
to display instantaneous flow temperature for
15 seconds.
• Use a regularly calibrated combustion analyzer for
combustion analysis.
• During normal operation boiler performs combustion
control cycles. In this phase CO values higher than 400
ppm can occur for brief periods of time.
9.13 Combustion Adjustment Function (CO
This function sets out to partially adjust the value of CO
Use the following procedure:
Press buttons
and
1.
When the function is enabled, displays shows "On" for a
few seconds followed by program row "304" alternated
with the % of boiler power;
9 - START UP PROCEDURE
- O
) in the combustion flue must be within tolerances indicated in table below.
2
2
MAH-100
MAC-115 & 150
CO2 %
O2 %
9.0
4.9
8.5 – 9.5
4.0 – 5.7
value
8.7
5.4
8.2 – 9.3
4.3 – 6.3
value
8.8
5.2
8.2 – 9.3
4.6 – 6.3
value
at the same time for 6
and
power/reset buttons,
2
together for at least 6 seconds.
Gas A (Natural Gas)
MAH-125
CO2 %
O2 %
8.7
5.4
8.2 – 9.3
4.3 – 6.3
8.7
5.4
8.2 – 9.3
4.3 – 6.3
8.8
5.2
8.2 – 9.3
4.3 – 6.3
After burner is lit, boiler reverts to maximum DHW power
2.
(100). When display shows "100" it is possible to partially
adjust value of CO
Press
3.
function number "304" (
Press
4.
-0.3% to + 0.3%);
Press
5.
on display again. Boiler continues operating at maximum
DHW power.
This procedure can be used to adjust CO
and minimum power by pressing
5 above.
After saving the new value (step 5 above), press
6.
to set boiler to ignition power. Wait for value of CO
to stabilize. Adjust as described in step 4 of procedure
(power value is a number <> 100 and <> 0). Repeat step
5 to save.
Press
7.
value of CO
value = 00);
Exit function by pressing
8.
6 seconds, see step 1.
9.14 Check Firing Rate
Measure input, if a gas meter is installed in the system.
1.
• Turn off gas to all other appliances.
%)
• Activate some heating zones to dissipate heat.
%.
• Set boiler on high fire using Chimney Sweep Function.
2
• Use ½, 1 or 2 cu ft dial on gas meter. Measure time
required for two or more complete revolutions. Measure
time
• Calculate input.
53
MAH-165
MAC-205
CO2 %
O2 %
9.0
4.9
8.5 – 9.5
4.0 – 5.7
8.7
5.4
8.2 – 9.3
4.3 – 6.3
9.0
4.9
8.5 – 9.5
4.0 – 5.7
%;
2
and
. Display shows "00" alternating with
flashes);
to raise or lower the amount of CO
to save new value. Power value "100" will show
to adjust boiler to minimum power. Wait for
to stabilize. Go to step 4 to adjust (power
2
and
for one or more minutes.
240013354 REV A [07/01/2021]
Gas E (LPG)
All
CO2 %
O2 %
10.0
5.7
9.5 – 10.5
4.9 – 6.4
10.8
4.8
10.3 – 11.3
3.7 – 5.2
9.8
6.0
9.3 – 10.3
5.2 – 6.7
(from
2
to ignition power
2
after performing step
2
together for at least
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