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COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSTANKLESS HIGH EFFICIENCYCONDENSING WATER HEATERSINDOOR MODELSATI-240, ATI-340, ATI-540COMMERCIAL-GRADE RESIDENTIAL / COMMERCIALUltra-Low NOx gas tankless water heaters with condensing technology featuring up to0.95 Uniform Energy Factor (UEF) which lowers operating costs and is environmentallyfriendly.FEATURES:SAFETY FEATURES:CONTINUOUS MAXIMUM FLOWRATES UP TO 10.0 GPM Air-Fuel Ratio (AFR) SensorENERGY STAR QUALIFIEDAVAILABLE IN NATURAL GAS ORPROPANE (LP)540 MODELS Can be used in residential and commercialapplications Easy-link up to 4 heaters Multi-link up to 20 heatersINDOOR MODEL Includes integrated temperature controlsand advanced diagnostics to simplifytroubleshooting Factory-installed power cordOUTDOOR MODEL Includes a wall mount temperature remotecontroller and advanced diagnostics tosimplify troubleshooting Exhaust & Water Temperature SafetyControl Overheat Cut-Off FuseINTERNAL FREEZE PROTECTIONSYSTEMPOWER DIRECT VENT DESIGN Category III or IV venting can be used Exhaust, 3” PVC Venting up to 70 Feet or4” PVC Venting up to 100 Feet Provides flexible venting with PVC, CPVC,or ABS Pipe for Intake and Exhaust (solidcore only). Canadian Installations RequireULCS636 Listed PVC or CPVC Pipe forVenting.ACCESSORIES Pipe Cover Neutralizer Kit Isolation Valve Kits Concentric TerminationDURABLE HEAT EXCHANGER: Product Preservers Anti-Scale System Primary heat exchanger is constructed ofa commercial-grade copper that is moreresilient to erosion. Copper is 25x betterat heat transfer than stainless steel thusstabilizing outgoing water temperaturesquicker. Multi-Unit Controller (540 Model Only) Secondary Heat Exchanger is made of Type316L Stainless Steel to protect againstcorrosion.COMMON VENT UP TO 8 UNITSOUTDOOR MODELSATO-240, ATO-340, ATO-540 Commercial Remote Temperature Control(540 Model Only)WARRANTY 15-year limited warranty on heat exchangerin residential applications 5-year limited warranty on heat exchangerin commercial applications540 models only 5-year warranty on all partsCOMPLIES WITH LEAD FREESTANDARDSANSI Z21.10.3 September 2017 A. O. Smith Corporation. All Rights Reservedwww.hotwater.com 800-527-1953 Toll-Free USA A. O. Smith Corporation 500 Tennessee Waltz Parkway Ashland City, TN 37015CSA 4.3Page 1 of 6AOSRG46835
COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSTANKLESS HIGH EFFICIENCY CONDENSING MODELSModelNumberGas Consumption InputTypeIndoor ModelsATI-240H-N NaturalATI-240H-P PropaneATI-340H-N NaturalATI-340H-P PropaneATI-540H-N NaturalATI-540H-P PropaneOutdoor ModelsATO-240H-N NaturalATO-240H-P PropaneATO-340H-N NaturalATO-340H-P PropaneATO-540H-N NaturalATO-540H-P PropaneInlet Gas PressureDimensions in InchesApproxHot/ColdGasUEF MaximumShippingGPM* Connections Connection Height Width Depth Weight(lbs)MinimumBTU/HMaximumBTU/HMinimumin. W.C.Maximumin. 66.68810103/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" 50.940.940.950.956.66.68810103/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" NPT3/4" 1-1/411-1/469696969696915-150 PSI Water Pressure. 40 PSI or above recommended for maximum flow.*Current numbers based on factory testing; 0.5 GPM for activation; 0.4 GPM required for continuous fire after initial ignition.Indoor models are certified from sea level to 10,100 ft. elevations. Outdoor models are certified from sea level to 6,000 ft. elevation.Page 2 of 6AOSRG46835
COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSFLOW RATE vs TEMPERATURE RISEPRESSURE LOSS240H 304.0203.0153.02.0102.01.01.00.008020 100500600.0401.020 1.0Pressure Loss se Rise( F)Tem3.0pe rature( 00TemperatureRise Rise( F) ( F)Tem pe rature80100TemperatureRise Rise( F) ( F)Tem pe ratureSet tem pe rature 125 F ( 52 C) or lowerSet tem pe rature 130 F ( 55 C) or hig her120Set tem pe rature 125 F ( 52 C) or lower1201401.0352.04.0405.06.07.08.09.0Flowrate (GPM)FlowRate(GPM)2025Set temperature 125 F (52 C) or lowerSet temperature 130 F (55 C) or .04.05.06.0Flow Rate 10.0 11.0 12.0Set temperature 130 F (55 C)0.0 or higher1.0 2.0060Pressure LossSet temperature 125 F (52 C)or lower00.05.04035157.0 8.010Flowrate (GPM)FlowRate(GPM)55.080PressureLossFlow Rate 0Set tem pe rature 130 F ( 55 C) or hig her1.0608080802.04060540H600.0100200 400.015455.001205 45Set tem pe rature F ( (GPM)52 C) or lowerFlow125Rate105Pressure Loss25100Temperature Rise ( F)1015540H10 50120200100402009.0100 10.08.03025506.03.0305Pressure Loss (psi)9.0352020 5Pressure Loss (psi)10 .0452025Flow Rate vs. Temperature40 Rise11.0 RiseFlow Rate vs. Temperature5010300540H6080 200 157.08.0Flow0.0Rate (GPM)540H7.080340H4035Pressure LOSSLossPRESSURE80Pressure Loss50Temperature Rise ( F)Temperature Rise ( F)Flow Rate (GPM)0.0Flow Rate (GPM)5.0259.08.06.050240H4010010 .0Flow Rate (GPM)Pressure Loss (psi)Flow Rate (GPM)7.0355.060Pressure Loss (psi)9.0Pressure Loss (psi)10 .08.0404.0120Head (Feet)10 .02545Flow Rate vs. Temperature Rise11.0Pressure Loss (psi)9.0454.0340H MODELFlow Rate vs.340HTemperature Rise11.011.03.040PRESSURE LOSS540HPressure Loss503010Flow Rate(GPM)TemperatureRise ( F)240HFlow Rate vs. Temperature Rise10 .0Flow Rate vs. TemperatureRise5.01.0 20 2.0Temperature Rise ( F)340H240H11.00.00100803520Head (Feet)4040Head (Feet)20602010FLOW RATE vs TEMPERATURE RISE6.0252.0ATE vs TEMPERATURE ressure Loss (psi)9.0120Head (Feet)45Pressure Loss (psi)50Flow Rate (GPM)11.010 .0Flow Rate (GPM)11.010 .0340H240HFlow Rate vs. PressureTemperatureLossRiseHead (Feet)Flow Rate vs. Temperature RiseHead (Feet)240H203.04.05.06.07.08.09.0010.0 11.0 12.0Flowrate (GPM)FlowRate(GPM)Set temperature 125 F (52 C) or lowerSet temperature 130 F (55 C) or higher140Set tem pe rature 130 F ( 55 C) or hig herPage 3 of 6AOSRG468357.08.01
COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSINDOORMODELINDOORMODEL11-1/4" (285 mm)4" (101 mm)4" (102 mm)Female5-3/4" (147 mm)Exhaust2-5/8" (65 mm)4" (102 mm)Female22-1/2" (570 mm)23-5/8" (600 mm)24-7/8" (631 mm)6-1/4" (159mm)Intake2-5/8" (68 mm)17-3/4" (450 mm)7" (180 mm)10-3/4" (272mm)Condens ate drain port7-1/2" (189 mm)GAS 5-7/8" (147 mm)120 VAC 3" (77 mm)COLD 5/8" (17 mm)5-3/4" (147 mm)Condensate drain port7-7/8" (199 mm)17-5/8" (448 mm)COLD 6-3/4" (172 mm)120 VAC 6-7/8" (174 mm)HOT 5-1/2" (140 mm)HOT 4-3/4" (120 mm)1/2 (13 mm)GAS 5-1/8" (131 mm)HOT 5-1/2" (140 mm)Drain port 6" (152 mm)COLD 6-3/4" (172 mm)120 VAC 6-7/8" (174 mm)Condens ate drain port7-7/8" (199 mm)COLD 5/8" (17 mm)120 VAC 3" (77 mm)GAS 5-3/4" (147 mm)Condens ate drain port7-1/2" (189 mm)GAS 5-1/8" (131 mm)HOT 4-3/4" (120 mm)Drain port6-3/4" (170 mm)6-1/4" (159 mm)Page 4 of 6AOSRG46835
COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSOUTDOORMODELOUTDOORMODEL17-3/4" (450 mm)7" (180 mm)11-1/4" (285 mm)11" (281 mm)22-1/2" (570 mm)3-5/8" (92 mm)1-1/2" (37 mm)23-5/8" (600 mm)24-7/8" (631 mm)4-1/2" (114 mm)10-3/4" (272 mm)HOT 4-3/4" (120 mm)120 VAC 6-1/4" (159 mm)Drain port6-3/4" (170 mm)COLD 5/8" (17 mm)GAS 5-3/4" (147 mm)Condens ate drain port7-1/2" (189 mm)1/2" (13 mm)120 VAC 3" (77 mm)GAS (131 mm)HOT (140 mm)Drain port 6" (152 mm)COLD 6-3/4" (172 mm)Condens ate drain port7-7/8" (199 mm)HOT 4-3/4" (120 mm)Condens ate drain port7-1/2" (189 mm)120 VAC6-1/4" (159 mm)Condensate drain port7-7/8" (199 mm)COLD 6-3/4" (172 mm)GAS 5-1/8" (131 mm)120 VAC 3" (77 mm)HOT 5-1/2" (140 mm)17-5/8" (448 mm)COLD 5/8" (17 mm)Page 5 of 6AOSRG46835
COMMERCIAL-GRADERESIDENTIAL / COMMERCIAL GAS WATER HEATERSSUGGESTED SPECIFICATION FOR ATI-540H OR ATO-540HThe fully modulating, on-demand, condensing gas fired tankless water heater(s) shall be A. O. Smith Tankless Water Heater model ATI-540H orATO-540H, having a maximum input rating of 199,000 Btu/h and available in NG or LP. The heater shall have ¾ in. male NPT water and gasconnections. The inlet gas supply pressures shall be 4.0 in. WC (min.) up to 10.5 in. WC (max.) for NG and 8.0 in. WC (min.) up to 14 in. WC(max.) for LP. The indoor heater(s) shall incorporate an integrated temperature controller that will provide diagnostic information, fault history,and heater set temperature. The outdoor heater shall be factory supplied with a temperature remote, 100209924, that can be installed up to400 ft. from the heater using 20 gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, andheater set temperature. The heater shall operate using 120 V / 60 Hz power source. The indoor heater will incorporate a factory installed powercord.The indoor heater shall be vented with 3” or 4” diameter schedule 40 PVC (solid core), CPVC, ABS, polypropylene or category IV vent pipe with alength not to exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent, terminating horizontally or vertically. The intake pipe mayuse material such as PVC, CPVC, ABS, aluminum, or Category IV pipe and cannot exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for4” vent. The indoor heater shall be able to be common vented with schedule 40 PVC pipe or approved polypropylene vent with a length not toexceed 100 ft. (equivalent) using up to 10 in. pipe. Proper sizing is provided in the heater’s installation manual. The outdoor heater(s) shall beconstructed with an integral exhaust vent on the front of the heater.The water heater shall use a commercial grade copper alloy, fin tube primary heat exchanger with quick release brass or bronze waterways. Thesecondary heat exchanger shall be constructed from stainless steel 316L. The heater shall be controlled by an onboard solid-state printed circuitboard which uses the following factory installed components: thermistors to monitor inlet & outlet water temperature and exhaust temperature;a flow sensor to measure flow rate; a flame sensor to monitor combustion; an air-fuel ratio rod to measure and adjust operation in order tomaintain optimal combustion efficiency. The heater also consists of inline fusing and surge absorbers for electrical surge protection, an electronicspark igniter, aluminized stainless steel burners, hi-limit temperature switches to monitor water and exhaust temperatures, modulating gas valve,an overheat cutoff fuse, ceramic heating blocks to protect the heat exchanger and water piping. The indoor heater shall incorporate auto-firesystem for additional freeze protection. The indoor model shall include an exhaust temperature monitoring system using an exhaust thermistorand automatic hi-limit switch to maintain safe exhaust temperatures for sch. 40 PVC. The heater shall have a built-in condensate trap for thesecondary heat exchanger.The heater can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard solidstate printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. The heaters can usea Multi-Unit controller, 100112691, to manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the mostefficient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts forbalanced duty/cycle operation.The heater shall be design certified by CSA according to ANSI Z21.10.3, approved for sale in the United States, ENERGY STAR qualified, has aminimum uniform energy factor of 0.93, meets the energy efficiency requirements of the U. S. Department of Energy and ASHRAE 90.1, complieswith SCAQMD Rule 1146.2 and other air quality districts with similar requirements for low NOx emissions of 14 ng/J or 20 ppm, and shall becertified by NSF to NSF/ANSI 5 Standard.For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. September 2017 A. O. Smith Corporation. All Rights Reservedwww.hotwater.com 800-527-1953 Toll-Free USAPage 6 of 6AOSRG46835
www.hotater.com 800-52-153 Toll-Free USA A. O. Smith Corporation 500 Tennessee Walt Paray Ashland City, TN 3015 COMMERCIAL-GRADE RESIDENTIAL / COMMERCIAL GAS WATER HEATERS Page 1 of 6 AOSRG46835 FEATURES: CONTINUOUS MAXIMUM FLOW RATES UP TO 10.0 GPM ENERGY STAR QUALIFIED AVAILABLE IN NATURAL GAS OR PROPANE (LP) 540 MODELS
