Weil-McLain Series 2 Manual page 53

® S
ERIES
Primary/Secondary System piping
Circulator zoning – Multiple
temperature zones with
secondary
(Shown with optional DHW piping)
See Figure 58
.
1. This confi guration is for circulator-zoned systems
with high- and low-temperature heating zones
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 shown.
2. Install a separate circulator (supplied by installer)
for each zone capable of delivering the proper fl ow
and head as shown.
Expansion Tank required
1. Provide a system expansion tank following the
guidelines on page 47 or 48 .
2. DO NOT use a closed-type tank if connecting to a
water heater that is equipped with an automatic vent.
System setup and settings
1. Hi-temp emitters may be baseboards, radiators, fan
coils, or heat exchangers.
2. Add a mixing device ( Figure 58 , item 30) to help
ensure supply water temperature will not exceed the
maximum allowable for the radiant system.
3. Heating zone supply water temperature settings
should be selected for the hi-temp zones. The mixing
device regulates supply temperature to the lower-
temp zones.
Domestic Hot Water (DHW) tank, if used
DHW direct connection—Pipe from the near-boiler
1.
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 priority operation, use a zone
controller. See notices on page 63 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 74 for setting instructions.
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
applications may violate Section 303 of
the 2007 Energy Act. See page 127 for
compliance information and exemptions.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
primary/
— Boiler Manual
Figure 58 Circulator zoning with high- and low-temperature
heating zones
Controlling the Zones
1. The ECO control can be used to control space heating only, domestic
water heating only, or both. Refer to fi eld wiring, beginning on
page 60 , for instructions on wiring to circulators.
2. The boiler and circulators can also be operated by a Weil-McLain
WMCR zone controller.
(continued)
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