Weil-McLain PLUS-E017-A/1206 manual Zoning with zone valves

PLUS LINE  Indirect-Fired Water Heaters – Series 3

B1				gas
	Install system water piping (space heating) (continued)
	Zoning with zone valves
		Figure 12 Zone valve zoning plus optional water
	1. Connect boiler to system as shown in Figure 12		heater piping
	when zone valve zoning. The primary/secondary
	piping shown ensures the boiler loop will have suf-
	ficient flow. It also avoids applying the high head
	of the boiler circulator to the zone valves.

2. Connect water heater (domestic hot water) pip- ing to indirect storage water heater as shown in Section A of this manual.

The PhD Control Module turns off space heating during water heater heat- ing. The boiler circulator will turn off, preventing hot water from circulating to the system. The flow/check valve shown on the boiler outlet piping prevents grav- ity circulation in the boiler loop during water heater heating.

3. Controlling the system circulator

a. To cycle the system circulator from the PhD control module, add a circulator relay wired to the boiler circulator terminals as shown on page 30.

NOTE 1: To ensure adequate flow rate through the boiler, use the following pipe size on all boiler loop piping (connecting boiler to and from the primary/secondary connection, item 21):

-80 or -105 – 1” or larger.

-155 or -230 – 1¼” or larger. -310 – 1½” or larger.

Use at least the minimum piping size above and pipe the boiler using only pri- mary/secondary piping as shown. Failure to follow these guidelines could result in system problems.

Legend Figure 12

1 boiler

2PLUS-Line indirect water heater

3Boiler relief valve (see boiler manual for piping details)

4Boiler relief valve discharge piping (see boiler manual for details)

5Water heater circulator (see page 7 for suggested sizing)

6Isolation valves

7System circulator

9Air separator [with automatic air vent only on systems using diaphragm (or bladder) type expansion tank]

10Flow/check valves (with weighted seats to prevent gravity circulation)

11Purge/drain valves

12Boiler circulator

13Zone valves, typical

20Make-up water supply

21Primary/secondary connection

8Diaphragm (or bladder) type expansion tank (see page 3 for piping of closed-type expansion tank, if used)

26 Part Number PLUS-E017-A/1206