Install Instructions

Part number 550-100-131/0715
– 44 –
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GAS-FIRED WATER BOILER — Boiler Manual
&IGURE Typical radiant heating system piping —
circulator zoning
,EGEND&IGURE
 Evergreen boiler
 Indirect water heater, if used
 Relief valve, supplied with
boiler, field piped — MUST
be piped to boiler supply
connection — see page 39 for
information.
 Relief valve piping to drain —
see page 39.
 DHW circulator.
 Isolation valves.
 Supplementary expansion tank,
diaphragm type, if used.
 Air separator.
 Flow/check valves or spring check.
 Purge/drain valves (one drain
valve is supplied loose with the
boiler).
 Boiler circulator.
14 Primary/secondary connection (tees
no more than 12 inches apart)
 Make-up water supply.
 High limit temperature control.
 Backflow preventer, if used.
 Zone circulators.
 Pressure reducing valve, if used.

Pressure/temperature gauge,
supplied with boiler, field
piped.
 Quick-fill valve, if used.
 Heating circuits.
 Additional heating circuits, if
any.
30 Mixing device, if any
31 System supply and return sen-
sors: Strap system sensors to
lines as shown, at least 6 pipe
diameters (but no more than
3 feet) from boiler connection
tees.
 = Items supplied with boiler
— all other items supplied by
installer.
Radiant Heating — Circulator zoning –
primary/secondary (Shown with optional DHW piping)
See Figure 52.
1. The Evergreen boiler is ideal for use in radiant heating. The unique
heat exchanger design allows it to work well even in condensing
mode. There is no need to regulate boiler return water temperature
in radiant heating applications.
2. Apply this configuration for typical radiant heating applications.
3. Size the system piping and circulators to provide the flow and
pressure drop needed.
4. 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).
5SEONLYPRIMARYSECONDARYPIPINGASSHOWN
Failure to follow these guidelines could result in system
problems.
(IGHLIMITINSYSTEMPIPING
1. Add the recommended high limit control (Figure 52, item 22) to help
ensure supply water temperature will not exceed the maximum allow-
able for the radiant system.
2. Wire the limit control to either the manual reset or automatic reset
external limit circuit of the Control.
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.
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
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 heat-
ing 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 circu-
lator 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.
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.