Weil-McLain 550-110-260/02002 typical piping — multiple-zoneinstallations, Boiler Manual, Figure

Boiler Manual

typical piping — multiple-zone installations

Figure 6

Zoning with circulators

— return water 130 °F or higher.

Figure 7

Zoning with zone valves

— return water 130 °F or higher.

1

ZONE 2

ZONE 1

1

2

ZONE 2

ZONE 1

1 1

2	1
	6

1 3

13 6

6 6

5

13

Cold 11 water

fill

12

9 10

1

Cold 11 water

fill

12

	1
	Alternate
	circulator
	location
9	10

26012

26013

1Boiler isolation (balancing) valves

2Flow/check valve

3System or zone circulator

5Zone valve

6Drain valve

9Relief valve

10 Automatic air vent (with diaphragm-type expansion tank), or connect to tank fitting (closed- type expansion tank). DO NOT use an automatic

air vent when using closed-type expansion tank. It would allow air to leave the system, causing waterlogging of the expansion tank.

11Fill valve

12Diaphragm-type or bladder-type expansion tank, if used (For closed-type expansion tank, pipe from top of air separator to tank fitting as in Figure 5.)

13Air separator and automatic vent, if used (Note that the fill valve must always be connected to the expansion tank, regardless of location of expansion tank circulator or air separator.

For systems with possible low return-water temperature (such as converted gravity systems, radiant heating systems and heat pump systems), refer to the special piping suggestions of Figures 8 - 12, as applies. Failure to prevent sustained low return water temperature to the boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death or substantial property damage.

Part number 550-110-260/0200 17