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T he Eve rgreen
®
Part number 550-100-211/0122
– 2 –
1. Stainlesssteelretubeheatexchanger
2. Burneraccesscover/heatexchangercoverplate
3. Blower
e advanced blower design and air inlet silencer on Evergreen
®
boilers
result in very quiet operation.
Air enters the boiler enclosure through the air intake adapter (Item 20), ows through
the enclosure, enters the air inlet silencer (Item 5), then enters the venturi (Item 6)
where it mixes with gas before entering the blower. e blower pulls air through these
components and then pushes it through the cover plate to the burner (Item 11).
4. Gasvalve
e automatic gas valve references the pressure in the Evergreen
®
cabinet and allows
gas to ow when the control (Item 17) applies power. A manual gas valve is shipped
loose with the boiler. It allows shutting o the gas supply for servicing or shut down.
See instructions in this manual for manual gas valve installation.
5. Airinletsilencer
The horn-shaped air inlet silencer significantly reduces fan noise, providing
exceptionally quiet operation.
6. Venturi
When air ows through the venturi, a negative pressure is created. is causes gas to
ow from the gas valve into the venturi, where it is mixed with the air. e gas/air
mixture then continues into the blower.
7. Outletwatertemperaturedualsensor
is dual sensor monitors boiler outlet water temperature. e control adjusts boiler
ring rate so the outlet water temperature is correct, based on the calculated (if outdoor
reset used — seepage129) or xed target temperature.
8. Returnwatertemperaturesensor
is sensor monitors return water temperature. e control reduces or increases boiler
input, depending on how close the return water temperature is to the outlet water
temperature.
9. Electronicdisplay&interfacebuttons
e electronic display is used to congure boiler settings and monitor boiler operation.
e buttons allow changing display mode, selecting and adjusting control settings, and
resetting the control aer lockout.
10.Flueadapter(ts4”PVC)
11.Burner
e high-grade stainless steel burner uses pre-mixed air and gas to provide a modulat-
ing ame to the heat exchanger.
12.Ignitionelectrode
e burner ame is ignited by applying a high voltage to the ignition electrode. is
causes a spark from the electrode to ground.
13.Flamesenserod
Aer ignition, this measures the ame signal to provide a safe combustion at all times.
14.Wateroutletpipe(supply)(1½”NPT)
15.Waterinletpipe(return)(1½”NPT)
16. Gas line
is stainless steel exible gas line connects the incoming gas line to the gas valve.
e gas line has a ¾”NPT connection for installation.
17.Evergreen
®
control(seediscussionupperright)
18.Circulator/CommunicationBoard
e circulator/communication board provides boiler-to-boiler communication,
Building Management System (BMS) interface, and 120VAC power for the boiler
loop circulator.
19. Transformer
e 120VAC/24VAC transformer provides 24VAC to low voltage control circuitry.
Do NOT splice wiring into transformer.
20.Airintakeadapter(ts4”PVC)
21a&21b.Electricalentrances
e four (4) knockouts on the le side of the control tray are intended for low voltage
and boiler pump wiring, and the four knockouts on the right side are intended for
the line voltage and three high voltage outputs from the control.
22.Airpressureswitch
Air pressure switch monitors air ow by sensing changes in pneumatic pressure.
23.Fluegascondensatedrain
Connect the boiler internal condensate trap line to the heat exchanger here (parts
supplied with boiler, but eld installed).
24.Controlaccesspanel(notshown)
Remove when power is o to access the control.
25.Fluegascondensatedrainconnection
e condensate trap PVC ttings are eld-installed, connected to the condensate trap
line as shown in this manual.
26.Frontdoor
e front door is sealed to the boiler assembly around its entire perimeter.
27.Frontdoorlatches
Two latches secure the door in place.
28.Flameinspectionwindow
e quartz glass window provides a view of the burner surface and the ame.
29.Fluegasdualsensor
is dual sensor monitors the ue gas exit temperature. e control will shut down
the boiler if ue gas temperature gets too hot. is protects the ue pipe and the heat
exchanger from overheating.
30.ON/OFFswitch
31.Boilerdrainvalve(notshown)
Shipped loose for eld installation. See instructions in this manual.
32.Boilerreliefvalve(notshown)
Shipped loose for eld installation. See instructions in this manual.
33.Boilerpressure/temperaturegauge(notshown)
Shipped loose for eld installation. See instructions in this manual.
34.Manualgasshutoffvalve(notshown)
Shipped loose for eld installation. See instructions in this manual.
35.LevelingLegs
e leveling legs are adjustable to level the boiler.
36.Receptacle
e receptacle can be used for a condensate pump 2 amp maximum.
37.Toppanelhatch
Remove this panel when removing the burner.
38.Controltrayinspectionwindow
Provides a better view of the burner and ame.
Evergreen
®
controloverview
y e Evergreen
®
control can operate a single boiler or coordi-
nate with other Evergreen
®
boilers in a multiple boiler system.
y Control inputs and outputs allow operation of multiple heat-
ing circuits (space heating and DHW, for example).
y Up to three priority levels can be set, providing automatic
switch-over on demand.
y is manual provides quick set-up information for single
boiler installations.
y e Advanced Manual, available at Weil-Mclain.com, pro-
vides instructions for setting up multiple-boiler systems and
for using advanced options for single boilers.
Evergreen
®
controloperation
y e control responds to signals from the room thermostats,
DHW aquastats (if used), boiler sensors (boiler return, boiler
supply, ue temperature), outdoor temperature and system
sensor, if used.
y e control automatically adjusts blower speed (and gas ow
rate) to match boiler output to space heating and/or DHW
heating demand.
y e default control settings provide for three space heating
zones. e control can be easily set up for operation with a
DHW zone, with or without domestic priority.
Evergreen
®
controlWIZARD
y e control setup Wizard is available from the BOILER
SETTINGS menu that appears during initial startup.
y e Wizard leads through a step-by-step setup procedure
designed for the application chosen.
y Context-sensitive help is available to explain the purpose of
key setup items.
220 /29 9/3 00 /39 9
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