Weil-McLain PLUS-E017-A/1206 manual Zoning with circulators, Manual Installation Start-Up Usage

Manual • Installation • Start-Up • Usage		• Maintenance • Parts
				gas
B1 Install system water piping (space heating) (continued)
Zoning with circulators
		Figure 13 Circulator zoning plus optional water
1. Connect boiler to system as shown in Figure 13			heater piping
	when circulator zoning. The boiler circulator can-
	not be used for a zone. It must supply only the boiler
	loop.

2. Install a separate circulator for each zone.

3. 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.

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 13

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

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

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

14Zone circulators, typical

20Make-up water supply

21Primary/secondary connection

Part Number PLUS-E017-A/1206 27