SECTION 15: REPLACEMENT PARTS43 of 55SECTION 15: REPLACEMENT PARTSSee warnings and important information on Page35, Section 13 before removing or replacing parts.Burner ComponentsAll serviceable burner parts are accessed by thehinged door on the side of the heater.15.1 Gas ValveRemove the gas supply pipe at the heater inlet.Follow instructions on Page 44, Section 15.2 toremove gas valve/manifold.Replace in reverse order. Verify that the gas flowdirection of the valve is correct. Use a minimumamount of gas seal on the thread joint. Check thatall the joints are leak free. Reset gas valve. SeePage 31, Section 11.2.2.IT IS IMPORTANT THAT ONLY THE CORRECTGAS VALVE IS USED WHEN REPLACING THESECONTROLS.Carbon Monoxide HazardWARNINGUse only genuine ADDISON® replacement parts per this installation, operation and servicemanual.Failure to follow these instructions can result in death, electric shock, injury or property damage.Explosion HazardDANGERElectrical Shock Hazard Fire HazardDescription Part NumberSingle Stage Gas Valve, NG (Models UHD[X][S][R] 150 - 250) 90032505Single Stage Gas Valve, LP (Models UHD[X][S][R] 150 - 250) 90032506Single Stage Gas Valve, NG (Models UHD[X][S][R] 300 - 400) 90032520Single Stage Gas Valve, LP (Models UHD[X][S][R] 300 - 400) 90032521Two Stage Gas Valve, NG (Models UHD[T][X][S][R] 150-250) 90032530Two Stage Gas Valve, LP (Models UHD[T][X][S][R] 150-250) 90032531Two Stage Gas Valve, NG (Models UHD[T][X][S][R] 300 - 400) 90032532Two Stage Gas Valve, LP (Models UHD[T][X][S][R] 300 - 400) 90032533Exa Valve ½" (Models UHD[M][X][S][R] 150-250) NG and LP 90032550Exa Valve ¾" (Models UHD[M][X][S][R] 300-400) NG and LP 90032551
