Weil-McLain 550-110-260/02002 primary/secondary preferred bypass piping, Boiler Manual, Figure

Boiler Manual

primary/secondary (preferred) bypass piping —

for radiant heating or converted gravity systems

Figure 8

Zoning with circulators

	ZONE 2
	ZONE 1
1	1
	2

		4a	12"	4b	3
	2
			MAX.		1
		6	1	13	6
				7b
			7a
		8		Alternate
				circulator
				location
		11	9	10
Cold
water
fill
		12

Figure 9

Zoning with zone valves

ZONE 2

ZONE 1

1

1	4a	12"	4b		5
				3
		MAX.
	6	1	13	1	6
			7b
		7a	Alternate
	8
			circulator
			location
	11	9	10
Cold
water
fill
	12

26014

26015

1Boiler isolation (balancing) valves

2Flow/check valve

3System or zone circulator

4System temperature gauges

5Zone valve

6Drain valve

7System temperature valves (see instructions to the left for adjusting valves)

8Blend temperature gauge

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.)

Part number 550-110-260/0200 19