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COMMERCIAL-GRADE <br /> Co S m i t h® RESIDENTIAL/COMMERCIAL GAS WATER HEATERS <br /> SUGGESTED SPECIFICATION FOR ATI-540H OR ATO-540H <br /> The fully modulating, on-demand,condensing gas fired tan kless water heater(s)shall be A.0.Smith Tankless Water Heater model ATI-540H or <br /> ATO-540H, having a maximum input rating of 199,000 Btu/h and available in NG or LP. The heater shall have 3/4 in. male NPT water and gas <br /> 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 <br /> (max.)for LP. The indoor heater(s)shall incorporate an integrated temperature controller that will provide diagnostic information,fault history, <br /> and heater set temperature. The outdoor heater shall be factory supplied with a temperature remote, 100209924,that can be installed up to <br /> 400 ft.from the heater using 20 gauge(minimum) control wire. The temperature remote shall provide diagnostic information,fault history,and <br /> heater set temperature.The heater shall operate using 120 V/60 Hz power source. The indoor heater will incorporate a factory installed power <br /> cord. <br /> 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 <br /> 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 <br /> 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 <br /> 4" vent. The indoor heater shall be able to be common vented with schedule 40 PVC pipe or approved polypropylene vent with a length not to <br /> exceed 100 ft. (equivalent) using up to 10 in. pipe. Proper sizing is provided in the heater's installation manual. The outdoor heater(s)shall be <br /> constructed with an integral exhaust vent on the front of the heater. <br /> The water heater shall use a commercial grade copper alloy,fin tube primary heat exchanger with quick release brass or bronze waterways. The <br /> secondary heat exchanger shall be constructed from stainless steel 316L. The heater shall be controlled by an onboard solid-state printed circuit <br /> board which uses the following factory installed components:thermistors to monitor inlet&outlet water temperature and exhaust temperature; <br /> 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 <br /> maintain optimal combustion efficiency. The heater also consists of inline fusing and surge absorbers for electrical surge protection, an electronic <br /> spark igniter,aluminized stainless steel burners, hi-limit temperature switches to monitor water and exhaust temperatures, modulating gas valve, <br /> an overheat cutoff fuse,ceramic heating blocks to protect the heat exchanger and water piping. The indoor heater shall incorporate auto-fire <br /> system for additional freeze protection. The indoor model shall include an exhaust temperature monitoring system using an exhaust thermistor <br /> 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 <br /> secondary heat exchanger. <br /> 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- <br /> state printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. The heaters can use <br /> a Multi-Unit controller, 100112691,to manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the most <br /> efficient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts for <br /> balanced duty/cycle operation. <br /> 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 a <br /> minimum uniform energy factor of 0.93, meets the energy efficiency requirements of the U. S.Department of Energy and ASHRAE 90.1,complies <br /> 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 <br /> certified by NSF to NSF/ANSI 5 Standard. <br /> :00 0.Smith Corp roan on reserves I he right to make product ch an ges or improvements vvith out prior notice. <br /> ®September 2017 A.0.Smith Corporation.All Rights Reserved Page 6 of 6 <br /> www.hotwateccom 1800-527-1953 Toll-Free USA AOSRG46835 <br />