State Industries STC-074 specifications Gas Valve

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

The supply gas pressure is normally measured at the gas valve inlet gas pressure tap,

if available, when the gas is flowing. The manifold gas pressure

is measured at the manifold pressure tap of the gas valve when the gas is flowing.

Gas valves used are 24 volt AC combination-step opening gas valves. They incorporate the main valve and gas pressure regulator into one body. The Low Gas Pressure Switch, the Supply Gas Inlet, and the Supply Gas Pressure Tap are shown in the Inlet View to the right.

The top view of the gas valve, shown on the right, shows the Main Gas Regulator, Manifold Pressure Tap, Top Knob, and the Limited Bleed Vent Port. The main gas regulator is found under the silver cap screw. It is factory preset to 3.5 inches W.C. and

adjusts gas pressure output from 3.0 to 5 inches water column. Caution: Always test the manifold pressure at the outlet when the gas is flowing.

Gas Valve

Inlet View

Top View

©2003 10 Technical Training Department

Ashland City, Tennessee