Install Instructions

ManualsBrandsBell & Gossett ManualsCirculator Pumps1/40 HP, NBF-12U/LW Bronze Circulator Pump, Lead Free

SYSTEM PREPARATION

Prior to pump start-up, closed heating and cooling systems

should be cleaned, drained, and refilled with clean water. The

system fluid pH must be maintained between 7 and 9.

START-UP

Do not start pump until the system has been filled and vented.

Air should be vented from the system by means of an air vent

located at a high point in the system. The system must be

completely vented prior to pump operation. Do not run NRF/

NBF/SSF circulators dry. Pump operation without water circu-

lation could result in pump and motor damage.

PERIODIC INSPECTION

Bell & Gossett NRF/NBF/SSF Circulators are designed to

provide years of trouble free service. It is recommended that

periodic inspections be made to check for potential problems

with the pump. If any leakage or evidence of leakage is pre-

sent, repair or replace the unit.

WARNING: HOT WATER LEAKAGE HAZARD

Pressurize the body slowly while checking for leaks at

all joints with gaskets or solder connections. Failure to follow

these instructions could result in serious personal injury

and/or property damage.

WIRING INSTRUCTIONS

A. Loosen the screw securing the conduit box cover (wiring

compartment), and remove the screw & cover.

B. Attach the appropriate size connector to the hole in the side

of the conduit box.

C.Using a minimum size of 14 AWG copper electrical wire

(refer to your local code for wiring restrictions), wire the

motor to a single phase power source that matches the

electrical rating on the pump nameplate. See Fig. 3. Use

the size of electrical wire as dictated by local code.

D. Connect the ground wire to the inside of the conduit box

with one of the green screws provided inside the box. See

Fig. 4.

NOTE: Electrical supply and grounding wires must be suit-

able for at least 90°C (194°F).

NOTE: Model NRF/NBF/SSF Circulators are impedance

protected and do not r

equire external overload protection.

WARNING: ELECTRICAL SHOCK HAZARD

Be certain that all connections are secure and the

conduit box cover is closed before electrical power is

connected. Failure to follow these instructions could result

in serious personal injury, death and/or property damage.

WARNING: ELECTRICAL SHOCK HAZARD

Disconnect and lock out the power before making

electrical connections. Failure to follow these instructions

could result in serious personal injury or death.

PUMP

MOTOR

PUMP MOTOR

IMPEDANCE

PROTECTED

FUSIBLE DISCONNECT

OR CIRCUIT BREAKER BY

OTHERS

TYPICAL WIRING INSTALLATION SCHEMATIC

1Ø POWER SOURCE

TO REMOTE

CONTROL

IF REQUIRED

FIG. 3

FIG. 4

CONDUIT BOX WIRING DETAIL

ALTERNATE

GROUND SCREW

GREEN

GROUND

SCREW

LINE

LEADS

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.