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Detailed installation diagrams are found in this manual. These BTH-500 1 1/2" NPT on gas water heaters are not approved for use on your A.O. Smith. User guide • Read online or download PDF • A.O. Smith BTH-500A User Manual • A.O. Smith Water boiler. A.O. Smith Water boiler BLOWER/BURNER ASSEMBLY. The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. Have a copy of the Instruction Manual(s) for all the water heating appliances being BTH 120-500 models is from the top of the water heater.View and Download A.O. Smith CYCLONE Xi BTH 500A owner's manual online. COMMERCIAL GAS WATER HEATER GAS-FIRED POWER BURNER FOR DOMESTIC HOT WATER. instruction manual commercial gas water heaters. 500 Tennessee Waltz Parkway. Ashland City, TN 37015. hotwater.com. models. Bth-120/150/199/250 series The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE BTH 500. 130. 492. Figure 6. These designs comply with the current