Trianco-Heatmaker 36C97 Gas Valve Type 201/203/404 1/2 Inch

White Rogers 36C97 Gas Valve, Type 201, 203 or 404, 1/2″The gas valve is a solenoid operated, negative pressureregulated valve. The outlet pressure is regulated at minus 0.2inches w.c. It is designed to operate with supply pressures of4-13 inches w.c. Within that range of supply pressures, theregulated discharge pressure may vary from minus .05 tominus .35 inches w.c. The regulator is not adjustable and theeffect of this variation in discharge pressure is not significant.Because of the fixed regulator setting, gas flow must beadjusted by changing the gas orifice.To remove the gas valve, shut off 120 volt power and themaster gas cock in gas line, loosen the nut on the gas orificeunion and remove the orifice union plus piping to the gas valve.Disconnect the wires from the gas valve. The valve may nowbe unscrewed from the inlet piping. It may be necessary todeflect the inlet piping somewhat in order to clear the boilerjacket. After the valve has been removed, replace with a newvalve in the reverse order in which the old valve was removed.Do not over tighten the fittings into the valve body as this maycause damage to the valve.NOTE: When fueled by LP gas, HeatMakers perform best with9-10 in. W.C. supply pressure. If no other appliances are beingsupplied by the LP supply set the low pressure regulator to 9-10