Gas Valve Removal - State Water Heaters 120 Series Service Handbook

gas valve removal

The outlet of the 24 Volt Gas Valve is connected by flange directly to the side of the Venturi and is secured by
three - 5/32" hex head screws. A gas orifice with gasket is fitted into the gas valve's outlet flange, see Figure
25 and Figure 26 below. The 24 Volt Gas Valve must be removed to inspect the gas orifice. Ensure there is
a new gasket on hand before removing the valve. Call the toll free phone number on the back cover of this
manual to order parts. Have the complete Model, Series and Serial number (located on the water heater's
rating label) for the water heater being serviced on hand before calling.
1. If the water heater is in a heating cycle lower the operating Set Point to end the cycle, see Temperatures
on page 49.
2. Turn off power to the water heater at the water heater's on/off switch.
3. Loosen the retaining screw for the wiring harness plug on the valve and disconnect the plug, see Figure
23 on page 23.
4. Turn off the supply gas to the water heater at the main gas shutoff valve serving the water heater.
5. disconnect the supply gas line to the water heater at the water heater's 24 Volt Gas Valve.
6. If the water heater has been installed in a direct Vent configuration, disconnect the intake air pipe at the
intake air connection on the water heater.
7. Loosen the hose clamp closest to the Venturi on the Intake Air Elbow and remove the Intake Air Elbow
and Intake Air Connection fitting as assembled unit, see Figure 14 on page 15.
8. Remove 3 gas valve mounting screws - 5/32" hex head machine screws, see Figure 25 below.
9. Carefully lift 24 Volt Gas Valve body off of the Venturi.
10. Follow these steps in reverse order to reinstall the 24 Volt Gas Valve.
11. Run the water heater through a complete heating cycle before leaving to ensure it is operating properly.
5/32 INCH
HEX WRENCH
24
24 VOLT GAS VALVE
VENTURI
GAS ORIFICE
GASKET
Servicing should only be performed by a Qualified Service Agent
Figure 25
Figure 26
GAS ORIFICE
& GASKET
GAS ORIFICE SIZES
NATURAL GAS: 0.191"
PROPANE GAS: 0.162"