Crown Boiler BIMINI BUDDY BWC090, Installation Instructions Manual

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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
2
(or O
2
) and CO at both high and low fire. The boiler may be temporarily locked into high or
low fire for 15 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
and O
2
readings are shown
in Table 11.3.
Table 11.3: Typical CO
2
/O
2
Combustion Readings
Model Fuel %Co
2
%o
2
BWC070 Natural Gas 9.4 4.4
BWC070 Propane 10.4 5.1
BWC090 Natural Gas 9.5 4.3
BWC090 Propane 10.5 5.0
BWC120 Natural Gas 9.5 4.3
BWC120 Propane 10.5 5.0
BWC151 Natural Gas 9.5 4.3
BWC151 Propane 10.5 5.0
Figure 11.2: Gas Valve Detail