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NORA Oilheat Technicians Manual

NORA has taken the next step and has developed an on-line calculator which allows technicians to compare the efficiency of boilers by inputting the amount of energy to heat the home and provide domestic hot water, Figure 13-9. Piping systems One of the features of hot water heat is its flexibility. You will find a wide variety of different hot water piping systems in the field. Each is designed for specific applications and has its advantages and disadvantages. The following is a brief description of some different hot water piping systems you are likely to encounter. Series loop The most common is the Series Loop. It is the least expensive and easiest to install. See Figure 13-10 for three examples of Series Loop systems. It features a single pipe that goes from the boiler outlet through each piece of radiation and back to the boiler inlet. One of the series loop’s biggest advantages is that it will supply heat to each of the pieces of radiation as the heat is pushed around the loop by the circulator with a minimum of pipe and fittings. No special valves or fittings are required. The disadvantage of this system is that heat delivered to the last piece of radiation is less than that delivered to the first piece. One pipe system This system also features single pipe that connects the boiler supply to the return while supplying the radiation. What makes it different from the series loop is all of the sections of radiation are connected to the single pipe main by the use of a standard tee and a special tee that form a “branch” of the main circuit. See Figure 13-11. The special tee is called by many names including “One-pipe”, “Venturi” “Mono- Flo” and “Jet” and it serves the purpose of directing the flow of water so that each section of radiation is supplied with water at approximately the same temperature. Figure 13-12 shows the special tees required for single pipe systems. Chapter 13 Heating Systems Figure 13-9: Image from FSA Calculator on NORA's website: nora-oilheat.org Figure 13-10: Series loop Through Wall Under Door Series-loop System Series-loop Baseboard with Tees for Individual Radiators 13-10 Heating Systems 2 Circuits with Balancing Valves Or— Series—loop 2 Zones with Zone Valves or Separate Pumps


NORA Oilheat Technicians Manual
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