Bell & Gossett P86203F NBF 45 Circulator - Manual (Page 12)

1. Remove the screws that secure the conduit box cover.
2. Lift off the cover.
3. Attach the appropriately sized connector to the hole in the side of the conduit box.
4. Wire the motor to a single phase power source that matches the electrical rating on
the pump nameplate. Use a minimum of 14 AWG copper electrical wire in order to
accomplish this.
Refer to your local code for wiring restrictions. Use the size of electrical wire as
dictated by local code.
5. Connect the earth (ground) wire to the inside of the conduit box with one of the green
screws provided inside the box.
Electrical Hazard:
Make sure that the equipment is properly grounded. Use a grounded
metal conduit, or ground the pump back to the service using a
correctly sized copper conductor. Connect the ground wire to the
green grounding screw in the wiring compartment.
The circulators are thermally protected by impedance or on-winding thermal protectors
and do not require external overload protection.
Wiring diagram
S
1
2
3
4
L N
1. Fusible disconnect or circuit breaker by others
2. Pump motor thermally protected
3. Pump motor
4. To remote control, if required
Figure 2: Typical wiring installation schematic (1Ø power source)
1
2
1. Line lead
2. Green ground screw
Figure 3: Conduit box wiring detail
Install a check valve
The NRF/NBF-25 pump discharge nozzle is machined to accept check valve P/N P86596.
Installation
10 NRF ™ -25,36,45/NBF ™ -25,36, and 45 Circulator Installation, Operation, and Maintenance Manual