Install Instructions

Part number 550-100-131/0715
– 43 –
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GAS-FIRED WATER BOILER — Boiler Manual
&IGURE Circulator zoning with high- and low-temperature
heating zones
Circulator zoning – Multiple
temperature zones with primary/
secondary
(Shown with optional DHW piping)
See Figure 51.
1. This configuration 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 flow and
head as shown.
3. The flow/check valve shown on the boiler outlet piping
prevents gravity circulation in the boiler loop during
DHW heating.
Use AT LEAST the -).)-5- pipe size shown
in Figure 44, page 37 on all boiler loop piping
(connecting boiler to and from the primary/
secondary connection, item 14). 5SEONLYPRI
MARYSECONDARYPIPINGASSHOWN Failure
to follow these guidelines could result in system
problems.
Expansion Tank required
1. Provide a system expansion tank following the guidelines
on page 40.
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 51, 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
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. See
notices on
See page 127 to ensure compliance with the 2007
Energy Act.
3. DHW Priority operation—The 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.
Overriding the Outdoor Reset function by
setting control to DHW mode when system is
intended for space heating may violate Section
303 of the 2007 Energy Act. See page 127 for
compliance information and exemptions.
Controlling the circulators
1. The Control can control up to four circulators (boiler cir-
culator and three others). Refer to Field wiring, beginning
on page 50, for instructions on wiring to circulators.
2. The factory default settings are: all three inputs are set up for Space
Heating (
Priority 2). Each input correlates to its respective circulator
output. For DHW applications, set Input 1 to Priority 1. See Field
wiring instructions, beginning on page 50, for details.
3. For more than 3-zones, use Weil-McLain WMCR zone Circ
controller.
4. The Control can operate the Hi-Temp Zones and Low-Temp Zones
at the same time when the corresponding inputs are set to the same
priority (default: Priority 2). A mixing device must be used in this
application to guarantee the proper temperature to the Low-Temp
Zones. Two different Priorities can also be used in this applica-
tion (such as Priority 2 and Priority 3). One priority used for the
Hi-Temp Zones and the other used for the Low-Temp Zones. This
will allow the boiler to run at lower temperatures while satisfying
the Low-Temp Zones thus increasing the boilers efficiency. Proper
safety measures should be takes to ensure safe water temperatures to
the Low-Temp Zones such as a Mixing device and/or a High Limit
Temperature Control. The Control can only satisfy one priority at a
time. Please set min and max on timers for each priority for optimal
performance.”
System piping - Single Boiler Systems (continued)
See Advanced Manual for Multiple Boiler Systems
-).)-5-
Boiler loop pipe size
Evergreen 220
Evergreen 299/300, 399
1¼”
1½”
See CAUTION at left.