The outlet of the gas valve is connected by flange directly to the side of the Venturi (page 14). There is no manifold gas line on the water heater. A gas orifice with gasket is fitted into the gas valve’s outlet flange. See the images below.
Gas Valve Removal
The gas valve must be removed to inspect the gas orifice. There are 3 – 5/32” hex head screws that secure the gas valve to the Venturi. Long T handle hex wrenches (8-10”) will save considerable time when removing/installing the gas valve, blower and burner.
GAS VALVE REMOVAL PROCEDURE
1 Ensure power to the water heater is turned off.
2 Turn off the supply gas shut off valve.
3 Disconnect supply gas line to water heater.
4 Remove 3 gas valve mounting screws – 5/32” hex head machine screws. Support gas valve body when removing last screw. Long T handle hex wrenches (8-10”) will save considerable time when removing/installing the gas valve.
5 Carefully lift gas valve body off of flange connection on Venturi.
6 Gas orifice and gasket are now accessible.