AO Smith ATI-240HX3 Commercial-Grade Residential Gas Water Heaters Instructions

AO Smith ATI-240HX3 Commercial-Grade Residential Gas Water

FEATURES

X3 SCALE PREVENTION TECHNOLOGY (PATENT PENDING)

• No annual descaling required
• No scale buildup means the heater maintains like-new performance longer

ENERGY STAR® QUALIFIED

DURABLE HEAT EXCHANGER

• Primary heat exchanger is constructed of a commercial-grade copper that is more resilient to corrosion. Copper is 25x better at heat transfer than Stainless Steel, thus stabilizing outgoing water temperatures quicker
• Secondary heat exchanger is made of 316L Stainless Steel to protect against corrosion

SAFETY FEATURES

• Exhaust & Water Temperature Safety Control
• Overheat Cut-Off Fuse
• Air-Fuel Ratio (AFR) Sensor

RECIRC CAPABLE
Tankless water heaters with X3 Technology are approved to work with an external recirculation pump and cross-over valve. See training manual for full details.

POWER DIRECT VENT DESIGN

• Category III or IV venting can be used
• Exhaust, 3” PVC up to 70’; 4” PVC up to 100’
• Provides flexible venting with PVC, CPVC, polypropylene, or ABS Pipe for Intake and Exhaust (solid core only)

ACCESSORIES

• Pipe Cover
• Neutralizer Kit
• X3 Freeze Protection Kit
• Concentric Termination
• Recess Box

WARRANTY

• No hardwater exclusions in the industry’s first “peace of mind” limited warranty
• 15-year limited warranty on heat exchanger in residential applications
• 5-year limited warranty on all parts in residential applications
• 1-year limited warranty on heat exchanger and parts in commercial applications
• For complete information, consult written warranty or go to hotwater.com

CONDENSING TANKLESS WITH X3® SCALE PREVENTION TECHNOLOGY

Model Number

| ****

Type

| Gas Consumption Input| Supply Gas Pressure| ****

UEF

| ****

Maximum **GPM***

| ****

Hot/Cold Connections

| ****

Gas Connection

| Dimensions in Inches| Approx. Shipping Weight (lbs)
---|---|---|---|---|---|---|---|---|---
Minimum BTU/H| Maximum BTU/H| Minimum in. W.C.| Maximum in. W.C.| Height| Width| Depth| Height with Cartridge
Indoor Models
ATI-240HX3-N| Natural| 15,000| 160,000| 4.0| 10.5| 0.94| 6.6| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 72
ATI-240HX3-P| Propane| 13,000| 160,000| 8.0| 14.0| 0.94| 6.6| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 72
ATI-340HX3-N| Natural| 15,000| 180,000| 4.0| 10.5| 0.95| 8| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 72
ATI-340HX3-P| Propane| 13,000| 180,000| 8.0| 14.0| 0.95| 8| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 72
ATI-540HX3-N| Natural| 15,000| 199,000| 4.0| 10.5| 0.93| 10| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 73
ATI-540HX3-P| Propane| 13,000| 199,000| 8.0| 14.0| 0.93| 10| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 73
Outdoor Models
ATO-240HX3-N| Natural| 15,000| 160,000| 4.0| 10.5| 0.95| 6.6| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 71
ATO-240HX3-P| Propane| 13,000| 160,000| 8.0| 14.0| 0.95| 6.6| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 71
ATO-340HX3-N| Natural| 15,000| 180,000| 4.0| 10.5| 0.94| 8| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 71
ATO-340HX3-P| Propane| 13,000| 180,000| 8.0| 14.0| 0.94| 8| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 71
ATO-540HX3-N| Natural| 15,000| 199,000| 4.0| 10.5| 0.95| 10| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 73
ATO-540HX3-P| Propane| 13,000| 199,000| 8.0| 14.0| 0.95| 10| 3/4″ NPT| 3/4″ NPT| 23-5/8| 17-3/4| 11-1/4| 35-9/16| 73

15-150 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.

INDOOR DIMENSIONS

OUTDOOR DIMENSIONS

SUGGESTED SPECIFICATION FOR ATI-540HX3 OR ATO-540HX3
The fully modulating, on-demand, condensing gas fired tankless water heater(s) shall be A. O. Smith Tankless Water Heater model ATI-540HX3 or ATO-540HX3, 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 gas connections. 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 water heater shall have the integrated X3 Scale Prevention Technology to prevent scaling of the heat exchangers. 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 to 400 ft. fromthe heater using 20 gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, and heater set temperature. The heater shall operate using 120 V / 60 Hz power source. The indoor heater will incorporate a factory installed power cord. 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 a length not to exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent, terminating horizontally or vertically. The intake pipe may use material such as PVC, CPVC, ABS, aluminum, or Category IV pipe and cannot exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent. The water heater shall use a commercial grade copper alloy, fin tube primary heat exchanger with quick release brass or bronze waterways.

The secondary 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 to maintain optimal combustion efficiency. The heater also consists of inline fusing and surge absorbers for electrical surge protection, an electronic spark 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-fire system for additional freeze protection. The indoor model shall include an exhaust temperature monitoring system using an exhaust thermistor  and automatic hi-limit switch to maintain safe exhaust temperatures for sch. 40 PVC. The heater shall have a built-in condensate trap for the secondary heat exchanger The heater shall incorporate a condensate drain blockage detector to provide safe operations and prevent overflow. The heater shall be design certified by CSA according to CSA/ANSI Z21.10.3 CSA 4.3, approved for sale in the United States, ENERGY STAR®  qualified, has a minimum uniform energy factor of 0.93, meets the energy efficiency requirements of the U. S. Department of Energy and ASHRAE 90.1, complies with SCAQMD Rule 1146.2 and other air quality districts with similar requirements for low NOx emissions of 14 ng/J or 20 ppm.

www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015

References

• Gas & Electric Water Heaters & Tankless Models | A. O. Smith
• Water Heaters | State Hot Water Heater Systems

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