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Part number 550-100-211/0122
– 46 –
Figure55 Typical radiant heating system piping —
circulator zoning
Legend—Figure55
1 Evergreen boiler
2 Indirect water heater, if used
3 Relief valve, supplied with
boiler, eld piped — MUST be
piped to boiler supply connec-
tion — see page41 for informa-
tion.
4 Relief valve piping to drain —
see page41.
5 DHW circulator.
6 Isolation valves.
8 Supplementary expansion tank,
diaphragm type, if used.
9 Air separator.
10 Flow/check valves or spring
check.
11 Purge/drain valves (one drain
valve is supplied loose with the
boiler).
12 Boiler circulator.
14 Primary/secondary connection
(tees no more than 12 inches
apart)
20 Make-up water supply.
22 High limit temperature control,
when required by local code or
for a radiant system.
23 Backow preventer, if used.
24 Zone circulators.
25 Pressure reducing valve, if used.
26
Pressure/temperature gauge,
supplied with boiler, eld
piped.
27 Quick-ll valve, if used.
28 Heating circuits.
29 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.
32 Low Water Cut-o
= Items supplied with boiler
— all other items supplied by
installer.
See Figure55.
1. e Evergreen
®
boiler is ideal for use in radiant heating. e unique
heat exchanger design allows it to work well even in condensing
mode. ere is no need to regulate boiler return water temperature
in radiant heating applications.
2. Apply this conguration for typical radiant heating applications.
3. Size the system piping and circulators to provide the ow and pres-
sure drop needed.
4. e ow/check valve shown on the boiler outlet piping prevents
gravity circulation in the boiler loop during DHW heating.
Use at least the MINIMUM pipe size shown in
Figure47,page39 on all boiler loop piping (connecting
boiler to and from the primary/secondary connection).
Useonlyprimary/secondarypipingasshown.
Failure to follow these guidelines could result in system
problems.
Highlimitinsystempiping
1. Add the recommended high limit control (Figure55, item22) 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 page42.
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 page129 to ensure compliance with the 2007 Energy Act. See
Advanced Manual to congure Boiler Pump to run during DHW
demands and change TARGET MOD SENSOR to System Supply.
3. DHW Priority operation— Using Priority 1 for DHW (default) will
turn o lower priorities during DHW calls. e MAX ON TIME
setting can be adjusted to limit how long this occurs. Use Priority
2 or 3 for DHW if DHW priority is not desired.
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
page129 for compliance information and exemptions.
Controlling the circulators
1. e control can control up to four circulators (boiler circulator
and three others). Refer to Field wiring, beginning on page52,
for instructions on wiring to circulators.
2. e 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 Priority applications,
wire aquastat to Input 1 and assign to Priority 1. See Field wiring
instructions, beginning on page52, for details.
3. For more than 3-zones, use Weil-McLain WMCR zone Circ
controller.
(continued)
220 /29 9/3 00 /39 9
MINIMUM
Boiler loop pipe size
Evergreen 220
Evergreen 299/300,
399
1¼”
1½”
See CAUTION at left.
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