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WD420/3/2007
To measure CO
boiler remove the 1/8" plug from the
flue outlet pipe spigot (Figure 6.7.4
item 17). Insert the probe of a
calibrated combustion analysis meter
and sample the gases as instructed in
the test equipment's instructions.
When firing the boiler for the first time
since installation, the CO level at high
rate may be between 100-220 ppm and
between 50-80 ppm at low rate. This is
due
to
compounds
manufacture
combustion chamber. On boilers which
have been fired for more than one hour
since installation, the CO levels should
not exceed 150 ppm at high rate and
50 ppm at low rate. If CO levels above these values are experienced, the combustion
chamber and flue system should be investigated.
The Qudos 28s is factory set for combustion and should need no adjustment. However, in
the event adjustment is required.
Check combustion errors are not a result of incorrectly installed flue and/or air system,
terminal location or damage or debris on the burner. If all these factors are found to be in
order precede as follows:
1)
Set any controls to call for heat.
2)
Press the "T T T T " button repeatedly until the display shows "SEr",
"ENTER". Press the "T T T T " until the display shows "100%". Press "ENTER" and the
boiler will be locked on at Maximum rate. If no further buttons are pressed for 10
minutes the boiler will automatically revert to normal operation.
3)
Measure the CO
adjustment screw (pos 4) to produce a CO
corresponding CO level of 50 to 150 ppm for natural gas and 10.3 to 10.7% with a
corresponding CO level of 50 to 150 ppm for LPG. NORMAL ADJUSTMENT, IF
REQUIRED, SHOULD NEED NO MORE THAN HALF OF ONE ROTATION OF
THE ADJUSTMENT SCREW (pos. 4). ADJUSTMENTS, IF MADE, SHOULD BE
IN STEPS OF NO MORE THAN 1/8 OF A TURN. YOU MUST WAIT 1 MINUTE
AFTER EACH ADJUSTMENT TO ALLOW THE SETTING TO STABILISE
BEFORE TAKING A READING
4)
Press the "RESET" button once and then press the "ENTER" button. Use the "S S S S "
button until the display shows "32%" ("30%" for LPG). Press the "ENTER" button
and the boiler will be locked on at Minimum rate. If no further buttons are pressed
for 10 minutes the boiler will automatically revert to normal operation.
5)
Measure the CO
8.8% with a corresponding CO level of 5 to 20 ppm for natural gas and 9.5% to
9.9% with a corresponding CO level of 5 to 20 ppm for LPG. THE CO2 LEVEL AT
LOW RATE MUST ALWAYS BE LESS THAN THE CO2 LEVEL AT HIGH RATE.
ADJUSTMENTS, IF MADE, SHOULD BE IN STEPS OF NO MORE THAN 1/8 OF
A TURN. YOU MUST WAIT 1 MINUTE AFTER EACH ADJUSTMENT TO
ALLOW THE SETTING TO STABILISE BEFORE TAKING A READING.
6)
Press the "RESET" button once and then use the "T T T T " button until the display
shows "100%". Press the "ENTER" button and the boiler will be locked on at
Maximum rate. Check the setting is within the range established in step 3. If not,
repeat the process again from step 3.
If following the above procedure, combustion levels described above at
both high and low rate could not be obtained, please turn off the appliance
and isolate the gas to the appliance. Telephone KESTON Heating technical
support (phone no. 0208 462 0262)
Installation & Servicing Instructions
Chapter 5 : Commissioning
levels in the Keston
2
used
during
curing
within
reading in the flue gases and adjust, if necessary, the
2
reading in the flue gases. The CO
2
The Keston Qudos 28s & Qudos 28sP Boilers
the
reading of 8.9% to 9.3% with a
2
then press
reading must be 8.4% to
2
Page : 29
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