RBI FUTERA XLF Series Control Manual
Also see for FUTERA III Series: User's information manualInstallation & operation manualInstallation and operating instructionsManual
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SETUP & OPERATON HeatNet Control V3Page 18Figure 10 Boiler System Response 2(1) MB/MW 500, (3) MB/MW 1250, 60% Mod-MaxTo correct this would require the MB/MW 500 to set theMOD-MAX to roughly 90% (Boiler System Response 3: notas efficient as it could be when using CB/CW Fusionboilers) in order to have a linear BTU transfer when theMB/MW 1250 is added (fired).Figure 11 Boiler System Response 3(1) MB/MW 500, (3) MB/MW 1250, 90% Mod-MaxAn MB/MW 500 running with a MB/MW 1250 may not bean optimal choice unless (2) MB/MW 500s are used in thePriority 1 set or (3) MB/MW 500s and one is allowed to betaken offline.A system employing this redundancy where (1) is allowedto be taken offline is listed in the MIXED BOILER SYSTEMchart. This system uses (3) MB/MW 500s and (3) MB/MW1500s. Two of the MB/MW 500s are treated as one whenadding the min inputs of the Priority 1 set.Figure 12 Boiler System Response 4(2) MB/MW 500s, (3) MB/MW 2000sThe Boiler System Response 4 graph illustrates anothersystem where 80% is used as the MOD-MAX clamp. Withthis example, when using all non-condensing boilers, thesystem can maximize the use of the smaller boilers beforecalling the larger ones.In summary, the system should be tuned using the boilerselection charts and the MOD-MAX value. Since selectingthe Priority 1 boiler is integral to the fault tolerance of thesystem, it is important to note any discontinuities in BTUs ifa Priority 1 boiler fails when multiple Priority 1 boilers areused.Mixed System Type 2:Condensing / Non-CondensingThis mixed system may also have mixed boilers withdiffering sizes as outlined in the Mixed System Type 1:High System Turndown section. In the following examplescondensing high mass boilers will be used with non-condensing low mass boilers. The reason for creating amixed system is primarily to control the system cost.0.000.100.200.300.400.500.600.700.800.901.000 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000Input, %System Load, Btu/HrBlr 1+2 (1750 MBTU)Blr 1+2+3 (4250 MBTU)Blr 1+2+3 (3000 MBTU)0.000.100.200.300.400.500.600.700.800.901.000 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000Input, %System Load, Btu/HrBlr 1+2 (1750 MBTU)Blr 1+2+3 (4250 MBTU)Blr 1+2+3 (3000 MBTU)0.000.100.200.300.400.500.600.700.800.901.000 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000Input, %System Load, Btu/HrBlr 1+2+3 (3000 MBTU)Blr 1+2+3+4 (5000 MBTU)Blr 1+2+3+4+5 (7000 MBTU) |
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