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standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), (indoor models must use the NSF approved top guard) Energy efficiency certified by Gas Appliance Manufacturers Association (GAMA), Met the California Energy Commission (CEC) standards Approved by the Commonwealth of Massachusetts Received New York City’s Material and Equipment Acceptance (MEA) UPC EFFICIENCY HEATING CERTIFIED The models listed in this manual have received the following certifications except where noted: ATI-305-N GTS-305-NI GT-305-NI ATI-305-P GTS-305-PI GT-305-PI ATO-305-N GTS-305-NE GT-305-NE ATO-305-P GTS-305-PE GT-305-PE ATI-505-N GTS-505-NI GT-505-NI ATI-505-P GTS-505-PI GT-505-PI ATO-505-N GTS-505-NE GT-505-NE ATO-505-P GTS-505-PE GT-505-PE ATI-705-N GTS-705-NI GT-705-NI ATI-705-P GTS-705-PI GT-705-PI ATO-705-N GTS-705-NE GT-705-NE ATO-705-P GTS-705-PE GT-705-PE ATI-705A-N GTS-705-NIA AGT-705-NI ATI-705A-P GTS-705-PIA AGT-705-PI ATO-705A-N GTS-705-NEA AGT-705-NE ATO-705A-P GTS-705-PEA AGT-705-PE 3 Water Quality and Scale Water Quality and Scale A complete water analysis and an understanding of system requirements are needed to protect the tankless water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility (fall out of solution) at higher temperatures. For example, for every 20°F over 140°F, the rate of scale increases by a factor of 2 (See figure below). Reference target water quality levels found in the operation / installation manual and consider water treatment if these levels are exceeded. * BASED ON 10 grains/gal HARDNESS * 210 180 150 120 90 60 30 0 LIME DEPOSITED, lb/ yr 180°F 170°F 160°F 150°F 140°F 120°F 39003300270021001500900300 0 WATER USAGE, gal/day *Source 2003 ASHRAE Handbook HVAC Applications 4 Pump Sizing for Circulation Pump Sizing for Circulation 1. Use the chart below or one appropriate for your conditions to determine the heat loss in the length of the hot water supply and return piping. For example, 100 ft of 1-1/2 in bare copper tubing results in a heat loss of 5300 Btu/h. Approximate Heat Loss from Piping at 140 .F Inlet, 70 .F Ambient * Nominal Size, in. Bare Copper Tubing, Btu/h-ft 1/2 in. Glass Fiber Insulated Copper Tubing, Btu/h-ft 3/4 30 17.7 1 38 20.3 1-1/4 45 23.4 1-1/2 53 25.4 2 66 29.6 2-1/2 80 33.8 3 94 39.5 4 120 48.4 * Source: 2003 ASHRAE Handbook HVAC Applications 2. Determine the acceptable temperature drop at the last fixture in the loop. For example, if the supply temperature from the water heater is 120 .F (49 .C) and an acceptable temperature at the last fixture ...

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