RBI Futera Fusion XLF Installation And Operation Instructions Manual

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16Finned copper tube gas boilers – Boiler ManualFinned copper tube gas boilers – Boiler ManualFDOMESTIC WATER SUPPLY PIPINGProper controls must be used to prevent water suppliedfor domestic use from exceeding 130°F, 54°C or ascald injury will occur! When higher water temperaturesare required for appliances such as a dishwasher, amixing valve or some other tempering means must beinstalled. Households with small children may requirewater temperature less than 120°F, 49°C. Local codesmust be complied with!General Piping RequirementsThe Fusion XLF boiler can be used in combination with an indirecttank to provide hot water for domestic use. Piping and componentsmust be suitable for use with potable water. The indirect storage tankmust be equipped with a temperature and pressure relief valve thatcomplies with ANSI Z21.22 or CAN-4.4 and CAN-4.6.Th e storage tank must be located as close to the unitheater as possible to prevent excessive head loss whichwill reduce fl ow.Bleed Air From Unit HeaterOpen the unit heater piping bleed valves one at a time, to purge theair trapped in the primary and secondary heat exchangers. Refer topiping drawings (Figures 10 & 11) for bleed locations.Expansion TankAn expansion tank or other means to control thermal expansionmust be installed in the water heating system if back flow preventiondevices are installed.Pump RequirementsThis low-mass water heater requires a continuous minimum waterflow for proper operation. The proper velocity through the unit heatermust be maintained for efficient operation and long life. If thetemperature rise through the unit heater is lower than recommendedthe water velocity is too high. Premature erosion of the heat exchangerwill occur. Conversely, if the temperature rise is too high, the flow rateis too low. Scaling and softening of the heat exchanger will occur. Thetemperature rise across the primary heat exchanger mustnever exceed 35°F, 19.4°C.Th e factory mounted circulatory pump is sized to workthe total boiler pressure drop and an additional 30 ft . ofpipe and 6-90° elbows.Storage Tank Thermostatic Mixing ValveWater can be stored at temperatures above 140°F, 60°C providedthat a thermostatically controlled mixing valve is used to temperthe hot water to an acceptable temperature before it’s supplied fordomestic use.The mixing valve MUST be set to prevent a scald injury fromoccurring, see the caution against scalding.Storage of water for domestic use above 140°F, 60°C will providean increased quantity of tempered water and help prevent thegrowth of water born bacteria.Table 7 Delta T/Boiler Recovery Table - FahrenheitTable 8 Delta T/Boiler Recovery Table - CentigradeModelInletTemp(deg f)2500 3000 3500 4000FlowRate(gph)Δt(deg f)FlowRate(gph)Δt(deg f)FlowRate(gph)Δt(deg f)FlowRate(gph)Δt(deg f)60 2794 105 3171 111 3700 111 4228 11180 3316 85 3717 91 4337 91 4956 91100 4203 65 4617 71 5386 71 6156 71120 5903 45 6250 51 7292 51 8334 51140 10,457 25 9804 32 11,438 32 13,072 32ModelInletTemp(deg c)2500 3000 3500 4000FlowRate(l/h)Δt(deg c)FlowRate(l/h)Δt(deg c)FlowRate(l/h)Δt(deg c)FlowRate(l/h)Δt(deg c)16 10,560 58 11,987 62 13,984 62 15,982 6227 12,536 47 14,051 51 16,393 51 18,735 5138 15,886 36 17,452 39 20,360 39 23,269 3949 22,314 25 23,627 28 27,564 28 31,502 2860 39,529 14 37,058 18 43,234 18 49,411 18