FIGURE5
BYPASS PIPING
FIGURE6
3.Hot water boilers installed above radiation level must be provided with a low water cut- off device.
4.When a boiler is connected to a heating system that utilizes multiple zoned circulators, each circulator must be supplied with a flow control valve to prevent gravity circulation.
5.Hot water boilers and system must be filled with water and maintained to a minimum pressure of 12 pounds per square inch.
6.Bypass piping is an option which gives the ability to adjust the supply boiler water temperature to fit the system or the condition of the installation. This method of piping, however, is not typically required for baseboard heating systems. Typical installations where bypass piping is used are as follows:
A. This method is used to protect
boilers from condensation forming due to low temperature return water. Generally noticed in large converted gravity systems or other large water volume systems. See figure 6 above.
B. These methods are used to protect systems using radiant panels and the material they are encased in from high temperature supply water from the boiler and protect the boiler from condensation. See figure 7 at right and 8 on page 8.
NOTE 1: When using bypass piping, adjust valves A and B until desired system temperature is obtained.
NOTE 2: Bypass loop must be same size piping as the supply and return piping.
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