Weil-McLain 550-141-850/0599 manual • Installation • Start-Up• Parts • Maintenance, Figure, tank

• Installation • Start-Up • Parts • Maintenance

Figure 9	Piping to single-zone system using diaphragm- or bladder-type	Figure 10 Piping closed-
	expansion tank. Boiler connections are 1" NPT (supply from 1" tee,	type expansion
	return to 1" system circulator flange).	tank

1Relief valve discharge piping — see page 27

2Boiler isolation valves

3Fill valve

4Air separator

5Automatic air vent

6Backflow preventer or check valve

7System supply piping

8System return piping

9Diaphragm-type expansion tank — always locate as shown in the suggested piping drawings, Figures 10 through 16

To cold fill

To cold fill

85011

10 Pressure reducing valve

11 Quick-fill bypass valve

12 Closed-type expansion tank — always locate as shown in the suggested piping drawings, Figures 10 through 16

85010 13 Tank fitting

Locate the air separator as shown in the suggested piping diagram, Figures 11 through 16 on the following pages. Pipe diaphragm- or bladder-type expansion tanks to the bottom of the separator.

Pipe closed-type (air in contact with water) tanks to the top of the air separator. Always connect the fill line to the expansion tank location, as shown above and in the suggested piping.

Part number 550-141-850/0699 29