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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 to Residential
Hydronic Heating Installation/Design and the PB
Heat, LLC Water Survey for additional guidance
during water piping installation.
2. Return Piping:
a. Pipe the outlet connection of the circulator to a
tee, provided with a drain valve, at the 1-1/4
NPT return tapping near the bottom of the left
section. Pipe the return to the inlet connection of
the circulator.
3. Supply Piping:
Pipe the supply to the 1-1/2 NPT supply tapping at
the top 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, LLC Water Survey.
5. If desired, install the circulator in the alternate
location shown in Figure 3.1. Consult the PB Heat,
LLC Water Survey for more information on
circulator location.
3. WATER PIPING AND CONTROLS
Figure 3.1: Supply and Return Piping
WATER PIPING AND CONTROLS