Submittal Sheet

For Technical Information, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Residential/Commercial Gas
Water Heaters
Page 1 of 4
AOSBG45100
©October 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
SUGGESTED SPECIFICATIONS FOR THE ATI-510U OR ATO-510U
The fully modulating, on-demand, gas fired tankless water heater shall be A. O. Smith Tankless Water Heater model ATI-510U 200 or
ATO-510U 200, having a maximum input rating of 199,000 Btu/h and available in natural gas (NG). For use with propane (LP) gas, the heater
shall be field converted using the factory supplied conversion kit. The conversion kit shall be supplied with the heater. 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 heater shall be supplied with an integrated controller or a temperature remote, 9009069005, that can
be installed up to 400 ft. from the heater using 20 gauge (minimum) control wire. The integrated controller or 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 4” diameter Category III vent pipe with a length not to exceed 60 ft. (equivalent), terminating
horizontally or vertically. The indoor heater can be direct vented using 3” diameter intake air pipe. The intake pipe may use material such as
PVC (solid core), ABS, aluminum, or Category III pipe and cannot exceed 60 ft. (equivalent) length. The outdoor heater shall be constructed with
an integral exhaust vent on the front of the heater.
The water heater shall use a commercial grade copper alloy, fin tube heat exchanger with quick release brass or bronze waterways. The heater
shall be controlled by an onboard solid-state printed circuit board which uses the following factory installed components: thermistors to monitor
inlet and outlet water 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, a hi-limit temperature switch, 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 heater can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard
solid-state printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. A Multi-Unit
controller, 9008300005, can manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the most efficient
performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts for balanced
duty/cycle operation.
The heater shall be design certified by CSA according to ANSI Z21.10.3, approved for sale in the United States, has a minimum energy factor
of 0.82, 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, and shall be Certified by NSF to NSF/ANSI
Standard 5.