Centauri. Condensing Fire Tube Water Boiler 399 to 1000 MBH

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1 Centauri Condensing Fire Tube Water Boiler 399 to 1000 MBH Pre-mix surface burner with up to a 7-to-1 turndown NOx levels as low a 5 ppm at full rate Operates on 4" gas pressure shown with optional gauges on supply piping Up to 95% efficiency No minimum flow - No minimum water temperature Simplified primary-only piping Riverside R HYDRONICS

2 Centauri Condensing Fire Tube Water Boiler 399 to 1000 MBH Flue Connection Premix Surface Burner MODE OF OPERATION Variable-speed Blower coupled with Proportionate Gas/Air Control 1st Pass (center tube) 2nd Pass (middle tubes) 3rd Pass (outer tubes, condensing zone with duplex stainless tubes) Condensate /Flue Collector Centauri is a modulating, high-effi ciency, three-pass, vertical fi re tube boiler. With boiler system return temperatures of 160 F, it will operate at 86% to 87% thermal effi ciency. When modulated down to low fi re and with low entering water temperatures, effi ciency can reach 95%. With each successive pass through the boiler, combustion gases are cooled. In the third pass, when operating with return temperatures less than 130 F, combustion products will cool below their dew point and the entrained water vapor will condense on the tube walls. The condensate that forms will drain by gravity unimpeded into the condensate collector and will be evacuated. This vertical tube design has its origins in condensing boilers and water heaters that were introduced in 1996 with several thousand of these products now in operation. The vessel is constructed and stamped to Section IV of the ASME code and carries a 10-year non-prorated warranty on materials, manufacturing and condensate corrosion. Condensate corrosion protection is provided by duplex alloy stainless steel fi re tubes in the condensing pass and a 439 series stainless steel condensate and fl ue collector. REDUCED OPERATING COST Condensing operation and the resulting higher effi ciency is dependent upon low return water temperature and optimized with reduced fi ring rates. Centauri is well suited for applications such as heat pump and snow melt where return temperatures are continuously below 110 F and the opportunity to combine these temperatures with a reduced fi ring rate is frequent. Additionally, Centauri boilers are suited for seasonal variations in boiler loop temperature, such as outdoor reset, where boiler return loop temperatures are regularly reduced to the level where condensing can occur. It s possible for the majority of the heating season to utilize low return temperatures, and a condensing boiler can signifi cantly reduce fuel consumption. The graph illustrates the performance of the 1 million Btu 85 Centauri. The 399 to 900 MBH boilers will have incrementally higher effi ciency rates with reduced water temperature and reduced fi ring rate. RETURN WATER TEMPERATURE F EFFICIENCY % ,000,000 BTU/H CENTAURI BOILER EFFICIENCY CURVES with 20 F Temperature Rise CONDENSING OPERATION Low Fire High Fire NON-CONDENSING OPERATION

3 LOWER INSTALLATION AND OPERATING COST Supply loop Building Circulator Return loop Centauri boilers are a medium-mass design containing a moderate amount of stored water. As a result, they provide several installation and operating cost advantages. BETTER INTEGRATION WITH VFD BUILDING LOOPS - LOWER BUILDING FLOW Unlike low-water-content water tube boilers, Centauri boilers do not have a critical minimum fl ow rate requirement. Because there is no lower limit on building water fl ow, Centauri boilers can take greater advantage of VFD pump systems, allowing the building fl ow to be reduced further and for pump energy savings to be maximized. LOW RETURN WATER TEMPERATURE The ability of the boiler to accept cold return water simplifi es piping by eliminating the bypass loop and thermostatic mixing valves required to protect other boilers from condensing. SIMPLER, PRIMARY-ONLY PIPING As illustrated above, Centauri boilers are most often piped in a reverse-return fashion using the building pump to circulate water through the boilers. This is the least costly piping approach as it eliminates the requirement for a separate pump and secondary piping circuit for each boiler. SMALLER BUILDING CIRCULATOR Maximum pressure drop through a Centauri boiler is one-half foot of head. This is about four foot of head less than the pressure drop of other condensing boilers that can be piped primaryonly. The lower total pressure drop of a multiple Centauri boiler system compared to competitive boilers might enable the use of a smaller building circulator, saving both in the initial pump cost and, most signifi cantly, the electrical consumption of the pump. LONGER, REDUCED DIAMETER VENTING Centauri boilers can accept direct combustion air through 6-inch diameter pipe for a distance of 100 equivalent feet. It can also simultaneously direct vent through 6-inch diameter pipe for a distance of 100 equivalent feet. The exhaust vent material must an approved stainless vent. This combined 200 equivalent feet is farther in length and smaller in diameter than most competitive condensing boilers, providing substantial savings in the cost of venting.

4 OPERATING CONTROLS AND BAS INTEGRATION In single-boiler installations, Centauri will utilize its onboard TempTrac electronic operating control, which includes the following operating modes and features: Set point operation * Outdoor reset * Nighttime setback * Modbus RTU serial connection for monitoring and overwrite by a building automation system ** LED readout of supply and return temperatures * Fully programmable parameters ** Gateways available for BACnet or LonWorks For multiple boiler installations with building automation communication over network connection, we recommend the Riverside Hydronics OnTrac multiple boiler controller with Modbus TCP/IP protocol via an Ethernet port. This PID controller has a full-color, touch-screen programmable user interface and provides all the functions of a typical multiple-boiler control. In addition, it provides operating history and real-time reporting of boiler operation including firing rate percentage and alarm status. OnTrac communicates with each boiler s TempTrac control through a serial connection using Modbus RTU. A simple, 2-wire daisy chain connects all boilers. BACnet or LonWorks connection to the BAS are also available. HYBRID BOILER SYSTEMS AND CONTROL - Savings on equipment and operation Hybrid boiler systems combine condensing and non-condensing boilers to capture both fuel savings and savings in initial equipment costs. For example, Centauri boilers would be fired in parallel during warmer weather when loop temperatures allowed condensing operation and the lower cost, non-condensing boilers would supplement heat output during the colder months when loop temperatures are too high for condensing to occur. The OnTrac control was developed specifically for hybrid systems. It will lead-lag and control the firing rate of the condensing boilers as a defined group and not energize any non-condensing boiler until all condensing boilers are at full rate. The non-condensing boilers can then be energized, rotated and modulated as required and as their own group. OnTrac Centauri 1 Centauri 2 Centauri 3 Non-Condensing Boiler 1 Non-Condensing Boiler 2

5 LOW NOx SURFACE BURNER This combustion technology offers: Seamless modulation with 7-to-1 turndown NOx levels 20 ppm through all fi ring rates on 399 to 850 MBH boilers NOx levels 30 ppm through all fi ring rates on 900 MBH boilers The 7-to-1 turndown and the built-in BTU buffer in the Centauri moderate mass boiler eliminates short cycling and provides loop temperature control that easily maintains building comfort levels. This level of modulation and the TempTrac s sensitivity of 1 F will easily accomplish a ± 2 F band around set point for virtually the entire heating season. Centauri built-in buffer tank is insulated with 3 inches of highdensity fi berglass (50% more than the competition). Over the heating season, standby loss from the tank averages only 0.003% of all the energy consumed by the boiler. Less than our competitor s smaller, but not as well insulated tank. The built-in buffer also eliminates the need for a supplemental buffer tank; occasionally required with instantaneous copper boilers due to short cycling. This technology utilizes: A 360, metal-matrix surface burner Variable frequency drive on combustion air blower for precise turndown Proportionate gas valve that induces gas flow based upon air fl ow. This system automatically maintains proper fuel-air ratio for optimum combustion under changing seasonal, weather and atmospheric conditions. It also corrects for altitude Available for firing with: Natural gas LP gas Combination natural and LP gas (dual gas train) Available voltages: 115/230V, 1Ø 208/230V, 3Ø 460V, 3Ø Air Inlet Blower Motor Surface Burner VFD Drive Operator Combustion Control Proportionate Zero-governor Gas Valve Gas Inlet

6 CENTAURI PERFORMANCE Input Btu/h Maximum Output Btu/h Series 125 per DOE requirements Maximum Output Btu/h Series 250 per DOE requirements 1,000, , , , , , , , , , , , , , , , , , , , DIMENSIONS Tank Series A Overall Width Centauri boilers are ETL-listed to UL795 and compliant with CSD-1, FM and ASHRAE B Overall Depth C Overall Height /2 40-3/ / Standard Electrical 120V, 1Ø, 60 Hz. 15 amp circuit Optional Electrical 240V, 1Ø, 60 Hz, 10 amp circuit 120V control circuit 208/230V, 3Ø, 60 Hz, 6 amp 480 V, 3Ø, 60 Hz, 3 amp 120V control circuit required 120V transformer optional Venting ETL, UL or ULC listed Category IV, 6" metal vent. Minimum distance 5 ft. Maximum distance 100 eq. ft. and maximum 0.80" W.C. pressure Inlet Combustion Air Up to 100 eq. ft. using PVC or galvanized vent pipe and 0.0" to -1.0" W.C. pressure Minimum Flow Gas Pressure Rated at 4.5" W.C. Consult factory for gas pressures lower than 4.5" W.C. Minimum Clearances 24" from front and top 8" from sides and rear Riverside R HYDRONICS RIVERSIDE HYDRONICS, LLC FORT WORTH, TEXAS (800) /2011

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