State Industries GSX - Manual (Page 18)

18
CHECKING THE GAS SUPPLY PRESSURE
Checking the Gas Supply Pressure
Gas pressure checks are done with flowing gas using
a gas pressure gauge capable of reading pressure in
inches of water column.
• Supply gas pressure checks are measured before
the gas control valve/thermostat and as close to
the water heater as possible.
• Manifold (main burner) gas pressure is measured
at the pressure tap on the bottom of the gas
control valve/thermostat. Use an Allen wrench to
remove the plug then attach the gas gauge.
NOTE: Desired gas pressures will be noted on the
gas valve label located on the gas control valve/
thermostat.
GAS
PRESSURE
GAUGE
CONNECTED AT
PRESSURE TAP
MANIFOLD GAS PRESSURE TEST
WHITE RODGERS GAS CONTROL
VALVE/THERMOSTAT SHOWN
GAS PRESSURE LABEL
Figure 16
IF . . . . . . THEN
supply gas pressure is under desired pressure
requirement • increase supply gas pressure regulator setting
and,
• increase supply gas piping size.
supply gas pressure is over desired pressure • add gas pressure regulator.
• reduce setting on existing regulator.
manifold gas pressure is more than +/- .3 inch
W.C. from values indicated on gas valve ensure there is adequate supply gas pressure •
e • nsure the main burner orifi ce is the correct size
for the water heater model being tested.
if the above tests have been performed and the
•
results were correct replace the gas control valve.
Combustion Air Test
The Installation Instructions and Use & Care Guide
gives guidelines under “Air Requirements” and
“Unconfined “ or “Confined Space” sections. If you
want to test for a lack of air:
1. Turn on every appliance and fan that exhausts
air from the utility room and/or house. Make
sure all windows and doors are closed, as well
as chimney dampers.
2. Open a hot water faucet so that the main
burner will ignite
3. Remove the outer door of the water heater –
not the inner door
4. Monitor the flame characteristics for several
minutes
If the flame begins to “yellow” open a door or window,
to the outdoors, to see if additional air corrects this
back to blue. If it does, the room needs more air
supply.
CHECKING FOR SUFFICIENT COMBUSTION AIR OR VENTING ISSUES
REVERSE FLOW
OF VENT PRODUCTS
EXHAUST FAN
VENT
Figure 17