State Industries SBD85 500 - Manual (Page 11)

SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
10
GAS PRESSURE REQUIREMENTS
Natural Gas Propane Gas
Maximum Supply Pressure 10.5" W.C. 13.8" W.C.
Minimum Supply Pressure 5.0" W.C. 11" W.C.
Manifold Pressure 4.0 " W.C. 10" W.C.
The supply gas pressure is normally measured at the dirt leg or at the gas pressure
tapping on the gas supply shutoff valve. This reading must be measured with 'flowing'
gas.
The manifold gas pressure is measured at the manifold pressure tap of the gas valve
when the gas is flowing.
Supply Gas
Dirt Leg
Manifold
Gas Port
Manifold
Pressure
Tap