State Industries GSX, GS6, GPX manual Checking the GAS Supply Pressure, Then

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.

WHITE RODGERS GAS CONTROL	GAS PRESSURE LABEL
VALVE/THERMOSTAT SHOWN

GAS

PRESSURE

GAUGE

CONNECTED AT

PRESSURE TAP

MANIFOLD GAS PRESSURE TEST

Figure 16

IF . . .	. . . THEN
supply gas pressure is under desired pressure	• increase supply gas pressure regulator setting
requirement	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	• ensure there is adequate supply gas pressure
W.C. from values indicated on gas valve	• ensure the main burner orifice 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.

CHECKING FOR SUFFICIENT COMBUSTION AIR OR VENTING ISSUES

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.

EXHAUST FAN

VENT

REVERSE FLOW

OF VENT PRODUCTS

Figure 17

18