PB Heat MI User Manual download pdf (Page 9)

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.

3. WATER PIPING AND CONTROLS

Figure 3.1: Supply and Return Piping

WATER PIPING AND CONTROLS

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PB Heat MI User Manual Page 9