WORK PLANS - Laserfiche WebLink

Home Browse Search

Residential / Commercial Gas C& I* ' th OSMI Tankless Water Heaters SUGGESTED SPECIFICATION FOR ATI-540H OR ATO-540H The fully modulating,on-demand,condensing gas fired tankless water heater(s)shall be A.0.Smith Tankless Water Heater model ATI-540H or 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 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 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,9009069005,that can be installed up to 400 ft.from the 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 indoor heater shall be able to be common vented with schedule 40 PVC pipe or approved polypropylene vent with a length not to 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 constructed 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. The secondary heat exchanger shall be constructed from stainless steel 316L. The heater shall be controlled by an onboard solid-state printed circuit board 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 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. The heaters can use a Multi-Unit controller,9008300005,to 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, ENERGY STAR`S qualified,has a minimum energy factor of 0.95,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 5 Standard. 800-527-1953.A.0.Smith Corporation reserves the right to make product changes or improvements without prior notice. ©September 2016 A.0.Smith Corporation.All Rights Reserved Page r of 6 www.hotwatercom 1800-527-1953 ToR-Free USA AOSRG46835