}

}To TT on boiler

To circulator

Input Power

120/1/60

Factory Installed Jumper

6 NO

5 6 NC

4 NC

4 NO

3 H N G

}

} To thermostat

T/W T/RC

To ZC

To circulator } } Input

Power 120/1/60

Remove Factory Installed Jumper

6 NO

6 NC

4 NC

4 NO

3 H N G5

TYPICAL WIRING SCHEMATICS

Thermostat Wiring

Figure 1: Cold Start Boiler

When a thermostat calls for heat, the corresponding circulator will start and the 5-6 NO end switch will close to enable the boiler.

Figure 2: Tankless Coil (Remove Jumper)

When a thermostat calls for heat, the corresponding circulator will start when the boiler temperature reaches the low limit setting

Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xyleminc.com/brands/bellgossett

Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries. © 2012 Xylem Inc. 210711C October 2012