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11) Perform a combustion test. Boilers equipped with a concentric vent system have a flue gas sample tap located in the
boiler vent collar (under the screw cap). For other vent systems, the sample probe may be inserted into the terminal.
If this is not possible, remove the flue temperature sensor and insert the analyzer probe in the sensor opening. For the
boiler to operate, this sensor will need to be remain connected to the wiring. If the flue gas sensor is removed, be sure to
replace it after combustion testing is complete.
Check CO
(or O
) and CO at both high and low fire. The boiler may be temporarily locked into high or low fire for 15
2
2
minutes as follows:
a) To lock the boiler in high fire, simultaneously press and hold the "Mode" button and "+" button until the display
flashes "H", indicating that the boiler has been driven to high fire. After this happens, allow the boiler to operate for
approximately 5 minutes before taking combustion readings.
b) To lock the boiler in low fire, simultaneously press and hold the "Mode" button and "-" button until the display
flashes "L", indicating that the boiler has been driven to low fire. After this happens, allow the boiler to operate for
approximately 5 minutes before taking combustion readings.
c) Normal modulation of the boiler should return 15 minutes after the boiler is locked in high or low fire.
At both high and low fire, CO readings should be less than 75 PPM. Typical CO
2
Figure 11.2: Gas Valve Detail
TablE 11.3: TYPiCal CO
rEaDings
Model
Fuel
FCM070
Natural Gas
FCM070
Propane
FCM090
Natural Gas
FCM090
Propane
FCM120
Natural Gas
FCM120
Propane
readings are shown in Table 11.3.
2
/O
COMbusTiOn
2
2
%CO
%O
2
2
9.4
4.4
5.1
10.4
9.5
4.3
10.5
5.0
9.5
4.3
10.5
5.0
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