79
Installation & Service Manual
Combustion Analysis Procedure
1. Turn the main power off to the boiler.
2. Remove the flue temperature sensor from the flue pipe
connection.
Note:
Combustion measurements will be
made at this point.
3. Insert the probe from a combustion analyzer into the
hole left by the removal of the flue temperature sensor.
4. Turn the main power on to the boiler.
5. Place the boiler into the active position by pressing the
UP button for five (5) seconds (see page 63).
6. Hold the ENTER key plus the UP button for five (5)
seconds to enter Service Mode.
7. Once the boiler has modulated up to full fire, measure the
combustion. The values should be in the range listed in
Table 13-5. The CO levels should be less than 150 ppm
for a properly installed unit.
If the combustion is not within the specified range,
reference Table 13-6 for possible causes and corrective
actions.
Table 3-6 Troubleshooting Chart - Combustion Levels
POSSIBLE CAUSE
CORRECTIVE ACTION
Vent/Air Intake Length
or Obstruction
• Refer to Section 3 - General Venting for the proper venting and air intake methods for the
Cadet heating boiler.
• Check for obstructions at the vent/air intake terminals.
Gas Supply Pressure
• Refer to Section 7 - Gas Connections for the proper gas supply for the Cadet heating boiler.
Dirty/Damaged Burner
• Refer to page 66 of this manual for burner removal.
• Replace burner if necessary.
Gas Valve Adjustment
• Refer to this page of the manual for the gas valve adjustment procedure.
13
Troubleshooting
(continued)
Table 13-5 Flue Products
Natural Gas
Propane
CO
2
O
2
CO
2
O
2
8.0% - 10%
3.0% - 6.5%
10.0% - 11%
4.1% - 5.4%
You must replace the flue gas temperature
sensor to prevent flue gas spillage into the
room. Failure to comply could result in
severe personal injury, death, or substantial
property damage.
WARNING
Gas valve adjustment procedure
Locate the throttle adjustment screw on top of the gas valve,
see FIG. 13-2. Using a screwdriver, turn the screw a 1/4 turn
counterclockwise
to increase CO
2
levels or a 1/4 turn
clockwise
to decrease CO
2
levels. After one adjustment on the valve,
follow the Combustion Analysis Procedure to measure the
combustion.
If combustion is still not within the specified range, repeat
the procedure. This procedure SHOULD NOT be performed
more than four (4) times. If after four (4) adjustments and the
combustion is still not within the specified range, revisit the
possible causes in Table 13-7 or replace the gas valve.
IMG00262
THROTTLE
ADJUSTMENT
Figure 13-2 Gas Valve Adjustment
8. Once the combustion analysis is complete, test the safety
shutoff device by turning the manual shutoff switch to
the OFF position and ensuring that the boiler shuts
down and registers an alarm. Turn the manual gas valve
to the ON position and reset the control.
9. Turn the main power off to the boiler and replace the flue
temperature sensor into the flue pipe connection.
10. Place the boiler back into normal operation.
