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FIGURE 10: Adjustable Mounting Flange Dimensions
DETERMINE ORIFICE SIZE AND RATE
The gas conversion burner needs to be set to deliver the same amount of heat to the appliance as the oil burner it is
replacing. Determine the Btu/hr heat input rate for the appliance by locating the rating plate of the appliance and
determine the firing rate of the oil burner. Typically the nozzle in the oil burner is stamped with the gallon per hour rate.
Use the lesser of these two rates as the firing rate of the gas burner.
For calculating from gallon/hour of oil to Btu/hour of gas, one gallon of oil produces 140,000 Btu/gal (147700 kJ/L) of
heat. For example: A furnace rating of 0.60 G.P.H. would be 0.60 x 140,000 = 84,000 Btu/hr. This is the input rate
needed from the gas burner.
Once the desired heat output of the burner has been determined, the gas orifice must be properly sized. The HSG200
and HSG400 power gas conversion burners are approved for use with natural and LP gas only. The HSG200 and
HSG400 burner models are shipped labeled and orificed for natural gas. To convert to LP gas and/or increase Btu/hr
(kW) input on natural or LP gas, an orifice kit is supplied with each burner with the orifices shown in Figure 11. Use
Figure 11 to select orifice size and manifold pressure to achieve desired rate on burner. If the desired input rating
cannot be obtained within the Figure 11 manifold orifice pressure adjustment range, the next size larger or smaller
orifice should be used (Refer to orifice chart Figure 11).
HSG200 is shipped from factory with a #8 - 0.199” orifice installed and HSG400 is shipped from the factory with a T -
0.358” orifice. The combination gas valve pressure regulator, which has an outlet pressure setting range of
approximately 2.0” w.c. (498.2 Pa) to 4.0” w.c (996.4 Pa) and is factory set at 3.5” w.c. (872 Pa).
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