How to Install Circulators on a Boiler

Turn off the electrical supply and water supply to the boiler. Close the shutoff valve for the water, and turn off the breaker for the boiler at the circuit panel.

Locate the screws used to secure the wiring cover on the existing circulator pump. Remove the screws with the Phillips screwdriver. This will expose the wiring for the circulator pump.

Disconnect the electrical wires that are connected to the motor. Label each wire with the felt-tip marker and masking tape.

Locate the flange bolts used to secure the circulator pump with the socket wrench. Loosen and remove all but one of the flange bolts.

Pull on the circulator pump to break the flange seal. Place a bucket under the flange, in case any water pours out. Remove the remaining flange bolt, and disconnect the circulator pump.

Attach the rubber gaskets that are supplied with your new circulator pump to the flanges. Position the new circulator pump in place, and verify its water flow orientation. Secure the circulator pump to the flanges by tightening the flange bolts.

Connect the wiring onto the circulator pump, using the labels on the wires. Twist the wires together, and cover with a wire nut. Tighten the screws to secure the wiring cover on the new circulator pump.

Open the shutoff valve for the water supply, and then turn on the breaker at the circuit panel. Check the flanges on the circulator pump for any leaks.