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Technical Training Department
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
©2003
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