Weil-McLain 550-110-260/02002 boiler-bypassalternate piping, Boiler Manual, Boiler-bypasspiping

Boiler Manual

boiler-bypass (alternate) piping —

for radiant heating or converted gravity systems

Figure 10 Boiler-bypass piping

Zoning with circulators

(Alternative to primary/secondary piping Figures 8 and 9)

	ZONE 2
	ZONE 1
1	1
	2

	4a		4b	3
	2
	6	1	13 1	6
		7a	8
			7b
	11	9	10
Cold
water
fill
	12
26016

Figure 11 Boiler-bypass piping

Zoning with zone valves

(Alternative to primary/secondary piping Figures 8 and 9)

		ZONE 2
		ZONE 1
	1			1
			4b	5
	6	Alternate	6	13
		circulator
		location
		7a	8
		7b
	4a	9	10
Cold	11
water
fill
	12	3
26017

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 21