WATER PIPING AND CONTROLS
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 to Residential
Hydronic Heating Installation/Design 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.
5. If desired, install the circulator in the alternate
location shown in Figure 3.1.
3. WATER PIPING AND CONTROLS
Figure 3.1: Supply and Return Piping
