6.3.1 Checking a boiler's fuel source
Danger
Operating any IBC appliance using a fuel other than the fuel listed on its rating plate is
prohibited. Failure to follow the instructions on converting to alternate fuels can result
in a fire or explosion, which may cause property damage, personal injury, or loss of life.
Check the rating plate of the appliance to ensure it is configured for the fuel you are
using. If the fuel is incorrect for the appliance, a conversion kit must be ordered from
IBC and the gas valve adjusted accordingly. Failure to perform the required fuel
conversion can result in an immediate hazard.
This boiler model can burn either natural gas or propane if equipped with the correct fuel-air
metering device. Examine the rating plate of the boiler to ensure it is configured for the fuel you
are using. For example, if the boiler is configured for natural gas, but needs to be converted to
propane, use the conversion kit (sold separately by IBC) to install the appropriate fitting(s) and
adjust the gas valve accordingly. See Table 11 for the required conversion kit.
The touchscreen controller will automatically detect the installation’s altitude and make the
appropriate adjustments to operate the boiler up to 12,000 feet in elevation without de-ration. The
boiler will automatically de-rate at altitudes above 12,000 feet.
Fuel conversion kit numbers
Compare the boiler model number with the Kit # found in the table below:
Model Number Natural Gas to Propane Propane to Natural Gas
SL 26-260 G3 P-300 P-301
SL 40-399 G3 P-302B P-303B
Table 11 Fuel Conversion Kits
6.3.2 Performing a fuel conversion
You must be a qualified heating professional to perform this procedure. In this fuel conversion,
you will be replacing the Venturi mixing device, located between the gas valve and gas line to the
fan.
6.3.1 Checking a boiler's fuel source
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