Weil-McLain EVERGREEN PRO EVG-299 User Manual

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Part number 550-100-211/0122

– 55 –

220 /29 9/3 00 /39 9 

(see wiring diagram, Figure 65, page 59)(continued)

E. Systemsupplyandreturntemperaturesensors – REQUIRED

TerminalBlockP14(EVG control module, left side)

1. Two strap-on temperature sensors are shipped with the boiler. Attach one

to the system supply piping and the other to the system return piping. For

piping larger than 5inch diameter or nonmetallic piping, using immersion

sensors will provide faster response.

2. Locate the supply sensor at least six pipe diameters, but no further than 3

feet, downstream from the boiler connection to the main to ensure adequate

mixing.

3. Supply sensor – wire between P14 #1 and #2 (common).

4. Return sensor – wire between P14 #3 and #2 (common).

5. ermostat wire can be used to connect these sensors.

6. e Control compares the system return temperature with the system supply

temperature. Should the return temperature ever exceed the supply tempera-

ture, the Control knows there is likely a sensor failure and will report this

problem on the display.

All heating systems shown in this manual require the System Sup-

ply and Return sensors to be installed for proper control function.

System will not properly provide heat if sensors are not installed

according to these instructions.

Strap to supply & return piping

See Figure65,page59 for details.

F. Outdoor temperature sensor – REQUIRED unless exempted

TerminalBlockP10(EVG control module, left side)

1. e control provides programmable options if using an outdoor tempera-

ture sensor. is sensor is supplied with the boiler.

2. Theoutdoorsensormustbeinstalledunlessspecicallyex-

emptedintheEnergyActstatementonpage129.

3. Mount the outdoor sensor on an exterior wall, shielded from direct sunlight

or ow of heat or cooling from other sources.

4. e wire outlet on the sensor must be oriented DOWN to prevent water

entry.

5. Connect the sensor leads to the terminal shown at right and in the wiring

diagrams (see Figure65,page59). ermostat wire can be used to connect

the sensor.

See Figure65,page59 for details.

G. External limits – OPTIONAL

TocauseM AN UALreset:TerminalBlockP13#1&#2(EVG control module, left side)

EVGcontrolwillrequiremanualresetaftercircuitisinterrupted

1. Remove factory-installed jumper and connect isolated contacts of external

limits across P13 pins1 and2 to cause the control to enter manual reset

lockout if the limit circuit opens. e limit must close and the control must

be manually reset using the procedure given in this manual. See drawing

at right and wiring diagram (Figure65,page59).

e control will lockout when a limit in its manual reset circuit

opens (P13 pins1 &2). e control activates its alarm terminals

and shuts the boiler down. An operator (user or technician) must

manually reset the control to restart the boiler.

See Figure65,page59 for details.

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Weil-McLain EVERGREEN PRO EVG-299 Gas Boiler Evergreen High Efficiency Gas Boiler

User Manual - Page 55