Chimney Sweep Function; Combustion Adjustment Function (Co2%); Check Firing Rate - Dunkirk DCBF-100 Manual

9.12 Chimney Sweep Function

For correct boiler operation, content of (CO2 - O2) in the combustion flue must be within tolerances indicated in
table below.
Combustion
Table
Maximum
Nominal value
power
Permitted
(100%)
value
Nominal value
Ignition
Permitted
power (*)
value
Nominal value
Minimum
Permitted
power (0%)
value
(*)
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
seconds. When the function is enabled, displays
shows "On" for few seconds followed by program
row "303" alternating with % of boiler power.
B. Press or to gradually adjust power
(increments of 1%).
C. To exit press both buttons
at least 6 seconds.
D. If value of CO -O
2
2
and their relative distances. See Figure 11-1.
If necessary, replace electrodes and position them
correctly. If problem persists, use "COMBUSTION
ADJUSTMENT FUNCTION (CO
General Maintenance, 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:
2
1.
Press buttons and
seconds. 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
DCBF-100
DCCF-115 & 150
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
8.8 5.2
8.2 - 9.3 4.6 – 6.3
and at the same time for 6
and together for
is different, check the electrodes
%)". See Section 11
2
2
together for at least 6
Gas A (Natural Gas)
DCBF-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
2.
After burner is lit, boiler reverts to maximum
DHW power (100). When display shows "100" it is
possible to partially adjust value of CO
3.
Press
with function number "304" (
4.
Press
(from -0.3% to +0.3%);
5.
Press
show on display again. Boiler continues operating at
maximum DHW power.
This procedure can be used to adjust CO
power and minimum power by pressing
performing step 5 above.
6.
After saving the new value (step 5 above), press
to set boiler to ignition power. Wait for value
of CO
procedure (power value is a number <> 100 and <>
0). Repeat step 5 to save.
7.
Press
for value of CO
(power value = 00);
8.
Exit function by pressing
least 6 seconds, see step 1.

9.14 Check Firing Rate

1.
Measure input, if a gas meter is installed in the
system.
• Turn off gas to all other appliances.
• Activate some heating zones to dissipate heat.
• Set boiler on high fire using Chimney Sweep
%)
Function.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure
time required for two or more complete
revolutions. Measure time
minutes.
• Calculate input.
51
DCBF-165
DCCF-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
and . Display shows "00" alternating
to raise or lower the amount of CO
to save new value. Power value "100" will
to stabilize. Adjust as described in step 4 of
2
to adjust boiler to minimum power. Wait
to stabilize. Go to step 4 to adjust
2
240013375 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
%;
2
flashes);
2
to ignition
2
after
and together for at
for one or more