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Primary/Secondary System piping (continued)
&IGURE Circulator zoning plus optional DHW
piping
,%'%.$FOR&IGURE and &IGURE
.OTEThis is a common legend for all piping diagrams, not
all items listed appear in every figure.
1 ECO wall mount boiler
2 Indirect Water Heater, if used
3 Relief valve, supplied with boiler, field piped — MUST
be piped to boiler supply connection — see page 12 for
information
4 Relief valve piping to drain — see page 46
5 DHW circulator
6 Isolation valves
7 System circulator
8 Expansion tank, diaphragm type, if used
9 Air separator
10 Flow/check valves
11 Purge/drain valves
(one drain valve shipped loose with boiler)
12 Auto air vent
13 Zone valves
14 Primary/secondary connection (tees no more than 12
inches apart)
15 Expansion tank, closed type, if used (some chiller
systems may use a diaphragm-type expansion tank)
16 Water chiller
17 Check valve
18 Y-strainer
19 Balancing valve
20 Make-up water supply – Use applicable codes to deter-
mine if backflow preventers, pressure reducing valves,
and fill valves may be required
21 By-pass pressure regulator, REQUIRED for zone valve
systems unless other provision is made
22 High limit temperature control
23 DHW tank boiler water supply connection, when used
24 Zone circulator
25 DHW tank boiler water return connection, when used
26 Pressure/temperature gauge, supplied with boiler, field
piped
27 Heating circuits
28 Additional heating circuits, if any
29 Boiler circulator, if any
30 Mixing valve, if any
Circulator zoning – primary/secondary
(Shown with optional DHW piping)
See Figure 51.
1. This configuration is for circulator-zoned systems using a boiler loop
connected as a secondary circuit off of a primary system loop. Systems
zoned with circulators must pipe the boiler loop as a secondary circuit as
show.
2. Install a separate circulator (supplied by installer) for each zone capable
of delivering the proper flow and head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guidelines on page
43 or page 44.
2. DO NOT use a closed-type tank if connecting to a water heater
that is equipped with an automatic vent.
Domestic Hot Water (DHW) tank, if used
1. DHW direct connection — Pipe from the near-boiler piping to the
DHW tank’s boiler connections as shown.
2. DHW as zone—A DHW tank can be connected as a zone if a DHW
tank is NOT already connected to the boiler. To provide DHW prior-
ity operation, use a zone controller. See notices on page 59 to ensure
compliance with the 2007 Energy Act.
3. DHW Priority operation—The ECO control turns off space heating
to the HEAT zones during domestic water heating calls on the DHW
input. The MAX ON TIME setting can be adjusted to limit how long
this occurs. Set the MAX ON TIME to “0” to disable domestic priority.
See page 70 for setting instruction
s.
4. If NOT connecting a water heater, do not use the DHW input or DHW
Circulator output on the ECO control.
Overriding the Outdoor Reset function by connecting space
heating zones to inputs and outputs intended for DHW ap-
plications may violate Section 303 of the 2007 Energy Act.
See page 119 for compliance information and exemptions.
Controlling the Zones
1. The ECO control can be used to control space heating only, domes-
tic water heating only, or both. Refer to field wiring, beginning on
page 56
, for instructions on wiring to circulators.
2. The boiler and circulators can also be operated by a
Weil-McLain WMCR zone controller.
Part number 550-142-122/0513
48
TM
GAS-FIRED WATER BOILER — Boiler Manual
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