Detroit Radiant Products Company FA Series - Manual (Page 15)

15
FA Series
Chart 3.2 • Natural Gas Consumption
*Assumes an average heating value of 1050 BTU/SCF and a Specific Gravity of 0.60.
Chart 3.3 • Propane Gas Consumption
*Assumes an average heating value of 2500 BTU/SCF and a Specific Gravity of 1.53.
Chart 3.4 allows for a 0.3 inch W.C. pressure drop in the supply pressure from the building main to the
inlet of the unit. Refer to the chart for the appropriate range of inlet pressures for each gas type. When
sizing the inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3 inch
W.C. pressure drop has been subtracted from the main pressure. If the 0.3 inch W.C. pressure drop is
too high, refer to NFPA 54 or the Gas Engineer’s Handbook for other gas pipe capacities.
3.0 Installation • Gas Supply Installation Instructions
Model
Manifold
Pressure
(Inches W.C.)
Min. Inlet
Pressure
(Inches W.C.)
Max. Inlet
Pressure
(Inches W.C.)
Gas
Consumption
(CFH)*
Gallons
per hour *
Orifice
Size
Number of
Orifices
FA-100P 10.0 11.0 14.0 40.0 1.10 54 DMS 4
FA-125P 10.0 11.0 14.0 50.0 1.37 54 DMS 5
FA-150P 10.0 11.0 14.0 60.0 1.65 54 DMS 6
FA-175P 10.0 11.0 14.0 70.0 1.92 54 DMS 7
FA-200P 10.0 11.0 14.0 80.0 2.20 1.45mm 7
FA-225P 10.0 11.0 14.0 90.0 2.47 54 DMS 9
FA-250P 10.0 11.0 14.0 100.0 2.75 1.45mm 9
Model
Manifold
Pressure
(Inches W.C.)
Min. Inlet
Pressure
(Inches W.C.)
Max. Inlet
Pressure
(Inches W.C.)
Gas
Consumption
(CFH)*
Orifice
Size
Number
of Orifices
FA-100N 3.5 5.0 14.0 95.2 42 DMS 4
FA-125N 3.5 5.0 14.0 119.0 42 DMS 5
FA-150N 3.5 5.0 14.0 142.9 42 DMS 6
FA-175N 3.5 5.0 14.0 166.7 42 DMS 7
FA-200N 3.5 5.0 14.0 190.5 39 DMS 7
FA-225N 3.5 5.0 14.0 214.3 42 DMS 9
FA-250N 3.5 5.0 14.0 238.1 40 DMS 9