PIPING AND CONTROLS
D.WATER BOILER PIPING
1.Refer to the Water Installation Survey and Hydronics Institute Residential Hydronic Heating Installation/Design Guide for Guidance.
2.The supply and return connections should be sized to suit the system.
3.Pipe the supply and return in one of two ways as shown in Figure 3.3:
a.Pipe the supply from the top of the rear section and return to the bottom of the front section. Use the 3/4" tapping in the top of the back section for air elimination.
b.As an alternative, pipe the supply from the top of the front section and return to the bottom of the rear section. Provide air elimination means within the supply piping.
4.When the return temperature from the system will be below 150°F on oil boilers for extended periods (heat pump systems, outdoor reset, snow melt, etc.), provide piping and controls to protect the boiler from condensation. Condensation will damage the boiler and will lead to shortened boiler life and maintenance problems.
5.If using a Partner indirect fired water heater or other, see Figure 3.4 for typical piping. Also refer to additional instructions supplied with the Partner.
6.If the boiler is to be used in conjunction with a refrigeration system, the chilled medium shall be piped in parallel with boiler and proper valves applied to prevent the chilled medium from entering the boiler. Refer to Figure 3.5.
7.If the boiler is connected to heating coils located in air handling units, the boiler piping system must be equipped with flow control valves or other automatic devices to prevent gravity circulation of the boiler water during the cooling cycle.
Figure 3.3: Water Boiler Piping
Figure 3.4: Piping with Peerless Indirect Water Tank
Figure 3.5: Isolating Boiler from Chilled Medium on Chiller Systems
7
