PB Heat MIH manual Water Piping and Controls, Boiler Supply and Return

WATER PIPING AND CONTROLS

3. WATER PIPING AND CONTROLS

A.BOILER SUPPLY AND RETURN

1.Size the supply and return to suit the system. A typical piping arrangement is shown in Figure 3.1. Refer also to the I=B=R Guide - Residential Hydronic Heating Installation/Design and the PB Heat Water Survey for additional guidance during water piping installation.

2.Return Piping:

Pipe the drain valve to a tee, provided, and the

1-1/4 NPT return tapping near the bottom of the left section. Pipe the return to the tee. Pipe the drain valve nipples and tee to the 1-1/4 NPT return tapping as shown in Figure 3.1.

3.Supply Piping:

Pipe the supply to the 1-1/2 NPT supply tapping at the top and rear of the boiler.

4.When system return water temperature will be below 130°F (54°C), pipe the boiler with a bypass arrangement to blend the system return and hot supply to obtain at least 130°F (54°C) entering the boiler. For more information on bypass piping, consult the PB Heat Water Survey.

Figure 3.1: Supply and Return Piping

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