Laars MagnaTherm HTD Series Installation And Operation Instructions Manual

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Laars MagnaTherm HTD Series Installation And Operation Instructions Manual Manual pdf 26 page image

LAARS Heating SystemsPage 22SECTION 4 Water Flow and Headloss Data4.A General Water Flow InformationTable 14. Boiler Water Flow and HeadlossTable 15. Minimum Allowable Water Flow Rates4.B Boiler Water Flow & Headloss DataSECTION 4 Water Flow and Headloss Data4.A. General Water Flow InformationMagnaTherm units are water-tube type units thatrequire water flow for operation. Boilers aregenerally used in closed systems, so Laars basesthe water flow data on temperature rise(difference between boiler inlet and outlettemperature.) Water heaters are used in opensystems, with new water constantly beingintroduced to the system. This brings a constantsupply of new minerals into the system, as well.Minerals can cause scale to form on the insidesurfaces of water heater systems (heaters, tanks,pipes, valves, and other components). Laars usesthe water-tube design to its advantage by basingthe water flow data on water hardness, to assist inminimizing mineral buildup in the heater'swaterways.4.B. Boiler Water Flow and Headloss DataThe water flow and headloss data shown in Table15 is based on full input of the boiler. The boilerhas a 20:1 turndown, meaning it modulates from5% to 100% of full input. Table 16 shows the waterflow required at the the boiler's minimum input,and this is the minimum water flow allowedthrough the boiler. Running in this condition isvery rare, and if the system requires this minimumwater flow, the water flow switch may need to beadjusted or replaced. Contact the factory if youhave such a system.Model25°F 30°F 35°F 40°FWaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)1600 122 19.4 100 14.0 87 10.0 76 8.02000 150 30.0 128 24.5 109 17.1 95 13.62500 190 34.0 158 24.6 136 17.6 119 13.63000 226 47.0 190 34.2 164 25.8 142 18.93500 266 41.0 222 31.6 190 23.6 166 18.64000 300 48.0 255 38.2 218 28.5 190 22.5*Headloss is for boiler only (no piping)Model14°F 17°F 19°F 22°FWaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)1600 462 5.9 379 4.3 329 3.0 288 2.42000 568 9.1 485 7.5 413 5.2 360 4.12500 719 10.4 598 7.5 515 5.4 451 4.13000 856 14.3 719 10.4 621 7.9 538 5.83500 1007 12.5 840 9.6 719 7.2 628 5.74000 1136 14.6 965 11.6 825 8.7 719 6.9*Headloss is for boiler only (no piping)Table 15. Boiler Water Flow and HeadlossModel Water Flow(gpm)Water Flow(l/m)1600 8 302000 11 422500 13 493000 16 613500 18 684000 21 79SECTION 4 Water Flow and Headloss Data4.A. General Water Flow InformationMagnaTherm units are water-tube type units thatrequire water flow for operation. Boilers aregenerally used in closed systems, so Laars basesthe water flow data on temperature rise(difference between boiler inlet and outlettemperature.) Water heaters are used in opensystems, with new water constantly beingintroduced to the system. This brings a constantsupply of new minerals into the system, as well.Minerals can cause scale to form on the insidesurfaces of water heater systems (heaters, tanks,pipes, valves, and other components). Laars usesthe water-tube design to its advantage by basingthe water flow data on water hardness, to assist inminimizing mineral buildup in the heater'swaterways.4.B. Boiler Water Flow and Headloss DataThe water flow and headloss data shown in Table15 is based on full input of the boiler. The boilerhas a 20:1 turndown, meaning it modulates from5% to 100% of full input. Table 16 shows the waterflow required at the the boiler's minimum input,and this is the minimum water flow allowedthrough the boiler. Running in this condition isvery rare, and if the system requires this minimumwater flow, the water flow switch may need to beadjusted or replaced. Contact the factory if youhave such a system.Model25°F 30°F 35°F 40°FWaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)WaterFlow(gpm)Headloss* (ft)1600 122 19.4 100 14.0 87 10.0 76 8.02000 150 30.0 128 24.5 109 17.1 95 13.62500 190 34.0 158 24.6 136 17.6 119 13.63000 226 47.0 190 34.2 164 25.8 142 18.93500 266 41.0 222 31.6 190 23.6 166 18.64000 300 48.0 255 38.2 218 28.5 190 22.5*Headloss is for boiler only (no piping)Model14°F 17°F 19°F 22°FWaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)WaterFlow (l/m)Headloss* (m)1600 462 5.9 379 4.3 329 3.0 288 2.42000 568 9.1 485 7.5 413 5.2 360 4.12500 719 10.4 598 7.5 515 5.4 451 4.13000 856 14.3 719 10.4 621 7.9 538 5.83500 1007 12.5 840 9.6 719 7.2 628 5.74000 1136 14.6 965 11.6 825 8.7 719 6.9*Headloss is for boiler only (no piping)Table 15. Boiler Water Flow and HeadlossModel Water Flow(gpm)Water Flow(l/m)1600 8 302000 11 422500 13 493000 16 613500 18 684000 21 79This appliance is a water-tube design that requireswater flow for operation. Boilers are generally used inclosed systems, so Laars bases the water flow data ontemperature rise (difference between boiler inlet andoutlet temperature.) Water heaters are used in opensystems, with new water constantly being introducedto the system. This brings a constant supply of newminerals into the system, as well. Minerals can causescale to form on the inside surfaces of water heatersystems (heaters, tanks, pipes, valves, and othercomponents). Laars uses the water-tube design toits advantage by basing the water flow data on waterhardness, to assist in minimizing mineral buildup in theheater’s waterways.The water flow and headloss data shown in Table 14 isbased on full input of the boiler. The boiler has a 20:1turndown, meaning it modulates from 5% to 100% offull input. Table 15 shows the water flow required atthe the boiler’s minimum input, and this is the minimumwater flow allowed through the boiler. Running in thiscondition is very rare, and if the system requires thisminimum water flow, the water flow switch may needto be adjusted or replaced. Contact the factory if youhave such a system.