Weil-McLain PLUS LINE PLUS-E017-A/1206 - Manual (Page 27)

Part Number PLUS-E017-A/1206 2
Manual
• Installation • Start-Up • Usage • Maintenance • Parts
Install system water piping
(space heating) (continued)
Figure 13 Circulator zoning plus optional water
heater piping
Zoning with circulators
1. Connect boiler to system as shown in Figure 1
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.
. 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 -10 – 1” or larger.
-1 or -20 – 1¼” or larger.
-10 – 1½” or larger.
Legend Figure 13
1 boiler
2 PLUS-Line indirect water heater
3 Boiler relief valve (see boiler manual for piping details)
4 Boiler relief valve discharge piping (see boiler manual for
details)
5 Water heater circulator (see page 7 for suggested sizing)
6 Isolation valves
7 System circulator
8 Diaphragm (or bladder) type expansion tank (see page 3
for piping of closed-type expansion tank, if used)
9 Air separator [with automatic air vent only on systems using
diaphragm (or bladder) type expansion tank]
10 Flow/check valves (with weighted seats to prevent gravity
circulation)
11 Purge/drain valves
12 Boiler circulator
14 Zone circulators, typical
20 Make-up water supply
21 Primary/secondary connection
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.
B1
Gas