Bell and Gossett NRF-25 Operation manual

NOTE: Bell & Gossett recommends Bronze or Stainless Steel
Booster Pumps be used for pumping potable water.
This pump is nonsubmersible, for indoor use only.
SAFETY
INSTRUCTIONS
This safety alert symbol will be used in this manual and on the
pump Safety Instruction decal to draw attention to safety related
instructions. When used, the safety alert symbol means
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
FAILURE TO FOLLOW THE INSTRUCTIONS MAY RESULT IN A
SAFETY HAZARD.
Your NRF/NBF Booster Pump should have the warning/caution
labels displayed to the right (Fig. 1) on the pump conduit box. If
the warning and caution labels are missing or illegible, contact
your local B&G Representative for a replacement.
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
WARNING
BEFORE INSTALLING, USING
OR SERVICING THIS PRO-
DUCT, READ THE INSTRUC-
TIONS. TO REDUCE RISK
OF ELECTRICAL SHOCK
SEE INSTRUCTIONS FOR
PROPER INSTALLATION.
CAUTION
FOR SUPPLY CONNECTIONS
USE WIRE SUITABLE FOR AT
LEAST 90°C. USE COPPER
CONDUCTORS ONLY.
EMPLOYER DES FILS
D
’ ALIMENTATION ADEQUATS
POUR 90°C. FOR INDOOR USE
ONLY. EMPLOYER UNIQUE-
MENT A L’INTERIEUR.
FIG. 1
NRF™ - 25, 36,45 / NBF™ - 25, 36,45 Circulator
Installation, Operation & Service Instructions
UL
®
C US
LISTED
Bell & Gossett
Instruction Manual P86203C
WARNING
RISK OF ELECTRIC SHOCK;
THIS PUMP HAS NOT
BEEN INVESTIGATED FOR
USE IN SWIMMING POOL
AND MARINE AREAS.
-NONSUBMERSIBLE PUMP-
P86313
DESCRIPTION
The Model NRF/NBF Circulator Pump features system liquid lubri-
cated bearings, non-overloading permanent split capacitor motor
with thermal, or impedance protection and quiet operation.
PUMP APPLICATION
The Model NRF/NBF Booster Pump may be used for water
circulating applications in hydronic and solar systems.
It has not been investigated, nor is it intended for use in swim-
ming pool and marine areas.
OPERATIONAL LIMITS
These pumps are designed to pump liquids compatible with
their iron or bronze body constructions.
Maximum Operating Pressure: 150 PSI (10 bars)
Maximum Operating Temperature: 225°F (107°C)
Electrical Rating: 115V, 60Hz, 1Ø; 230V, 60Hz, 1Ø

*Teflon is a registered trademark of E.I. DuPont de Nemours and Company.
WARNING: HOT WATER HAZARD
Before draining the system, allow water to cool to at
least 100°F, open the drain valve (take precautions against
water damage) and leave the drain valve open until
servicing is complete. Failure to follow these instructions
could result in serious personal injury, death and/or
property damage.
REMOVAL OF PUMP FROM EXISTING SYSTEM FOR REPLACEMENT
WARNING: ELECTRICAL SHOCK HAZARD
Disconnect and lockout the power before servicing.
Failure to follow these instructions could result in serious
personal injury or death.
WARNING: ELECTRICAL SHOCK HAZARD
Be certain the electrical power is not present at the
motor leads before continuing. Failure to follow these
instructions could result in serious personal injury or death
WARNING: HIGH PRESSURE HAZARD
Pressure may be present in the pump body. This
pressure can be relieved by loosening the flange bolts and
shifting the pump assembly slightly to allow the pressurized
water to escape. Failure to follow these instructions could
result in serious personal injury or death.
1. Close the valves on the suction and discharge sides of the
pump. (If no valves have been installed, it may be neces-
sary to drain the system.)
2. Loosen the conduit box cover screw and remove the cover.
3. Disconnect the electrical supply lines to the pump.
4. Remove the flange nuts and bolts or loosen the union ring
nuts. Then remove the pump from the piping.
MECHANICAL SAFETY
THERMAL SAFETY
ELECTRICAL SAFETY
SAFETY REQUIREMENTS
WARNING: EXCESSIVE SYSTEM
PRESSURE HAZARD
The maximum working pressure of the pump is listed on
the nameplate –DO NOT EXCEED THIS PRESSURE.
Failure to follow these instructions could result in serious
personal injury, death and/or property damage.
WARNING: EXCESSIVE PRESSURE HAZARD
VOLUMETRIC EXPANSION
The heating of water and other fluids causes volumetric
expansion. The associated forces may cause failure of
system components and the release of high temperature
fluids. This can be prevented by installing properly sized
and located compression tanks and pressure relief valves.
Failure to follow these instructions could result in serious
personal injury, death and/or property damage.
WARNING: EXTREME TEMPERATURE HAZARD
If the pump, motor or piping are operating at
extremely high or low temperature, guarding or insulation is
required. Failure to follow these instructions could result in
serious personal injury, death and/or property damage.
WARNING: ELECTRICAL SHOCK HAZARD
Electrical connections are to be made by a qualified
electrician in accordance with all applicable codes,
ordinances and good practices. Failure to follow these
instructions could result in serious personal injury, death
and/or property damage.
WARNING: ELECTRICAL GROUNDING HAZARD
Adequate electrical grounding is required for the safe
operation of B&G Pumps. The use of grounded metal
conduit assures this requirement. If the means of connection
to the supply –connection box (wiring compartment) is
other than grounded metal conduit, ground the pump back
to the service. Use a copper conductor at least the size of
the circuit connectors supplying the pump. Connect the
ground wire to the green grounding screw in the wiring
compartment. Failure to follow these instructions could
result in serious personal injury, death and/or property
damage.
2
PUMP INSTALLATION
Locate the pump so there is sufficient room for inspection,
maintenance and service. Bell & Gossett recommends the
installation of service valves on the suction and discharge of
all circulators to facilitate servicing or replacement of the
circulator without draining the system.
Install suction and discharge flange connectors on the pipe
ends. The use of Teflon®tape sealer or a high quality thread
sealant is recommended.
Be sure to minimize any pipe-strain on the pump. Support the
suction and discharge piping by the use of pipe hangers near
the pump. Line up the vertical and horizontal piping so that the
bolt-holes in the pump flanges match the bolt-holes in the
pipe flanges. DO NOT ATTEMPT TO SPRING THE SUCTION
OR DISCHARGE LINES IN POSITION. THIS MAY RESULT
IN UNWANTED STRESS IN THE PUMP BODY, FLANGE
CONNECTIONS AND PIPING. The code for Pressure Piping
(ANSI B31.1) lists many types of supports available for various
applications.
Bell & Gossett flange gaskets must be installed between the
NRF/NBF pump body flanges and the suction and discharge pipe
flanges. Use 7/16" diameter x 11/2" long cap screw and matching
nut to connect the pump to the flanges.
WARNING: RISK OF ELECTRIC SHOCK
Do not install this pump in swimming pool or marine
areas. Failure to follow these instructions could result in
serious personal injury, death and/or property damage.
CAUTION: The use of Teflon®* impregnated pipe
compound and Teflon®tape on pipe threads pro-
vides lubricity which can lead to overtightening and break-
age. Do not overtighten. Failure to follow this instruction
can result in moderate personal injury from hot water
and/or property damage.

3
WARNING: WATER LEAKAGE HAZARD
To prevent leakage, make certain that the flange bolts
or ring nuts have been adequately tightened and that the
solder connections do not leak. Failure to follow these
instructions could result in serious personal injury, death
and/or property damage.
Apply torque in even increments to both flange bolts until a
value of 115 in-lbs. is reached. Both the suction and discharge
flange bolts must be torqued in this manner.
MODE OF DISCHARGE
The Model NRF/NBF Circulator can be installed to discharge
up or down, horizontally, left or right, but the motor shaft must
remain in the horizontal position, the arrow on the body must
point in the direction of the flow, the conduit box must be posi-
tioned on the top or to the side of the motor housing (see fig-
ure 2). If the conduit box position must be changed, it is best
to do so before installation. However, if the pump is already
installed, see the section titled “REMOVAL OF PUMP FROM
EXISTING SYSTEM FOR REPLACEMENT”before proceeding.
TO CHANGE THE CONDUIT POSITION
1. Remove the four (4) 1/4-20 Allen screws (3/16 wrench) while
supporting the motor assembly.
2. Remove the motor assembly from the pump body and
rotate it to the desired position (see figure 2).
3. Replace the Allen screws and tighten evenly in a diagonal
method to 60 in-lbs.
4. Check to see that the impeller turns freely. Insert your finger
in the discharge port of the pump body (the arrow on the
pump body points in the direction of the discharge) until
you can feel the impeller and rotate it with your fingertip. If
the impeller does not turn easily, repeat the disassembly/
reassembly process.
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 Circulators are thermally protected
by impedance or on-winding thermal protectors and do not
require external overload protection.
SPEED SELECTION
The NRF/NBF can be run at different speeds to suit the
required operating conditions. The speed can be selected by
adjusting the 3 position switch on the side of the terminal box
(Fig. 4).
WARNING: HOT WATER HAZARD
When disassembling a gasketed joint, always use a
new gasket upon reassembly. NEVER RE-USE OLD
GASKETS. Failure to follow these instructions could result
in serious personal injury, death and/or property damage.
WARNING: HOT WATER HAZARD
Make sure that each flange gasket remains seated in
the flange groove during and after installation. Failure to
follow these instructions could result in serious personal
injury, death and/or property damage.
CAUTION: Make sure the power is turned off before
placing anything inside the discharge opening to
move the impeller. Failure to follow these instructions could
result in serious personal injury, death and/or property
damage.
FIG. 2
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.
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.
S
PUMP
MOTOR
LN
PUMP MOTOR
THERMALLY
PROTECTED
FUSIBLE DISCONNECT
OR CIRCUIT BREAKER BY
OTHERS
TYPICAL WIRING INSTALLATION SCHEMATIC
1ØPOWER SOURCE
TO REMOTE
CONTROL
IF REQUIRED
FIG. 3
CONDUIT BOX WIRING DETAIL PUMP SPEED CONTROL
LINE
LEAD GREEN
GROUND
SCREW
ADJUST PUMP SPEED BY
ROTATING CONTROL KNOB
TO POSITION
1: MINIMUM SPEED
2: MEDIUM SPEED
3: MAXIMUM SPEED
FIG. 4

ITT
8200 N. Austin Avenue
Morton Grove, IL 60053
Phone: [phone]
Fax: [phone]
www.bellgossett.com
© COPYRIGHT 2008 BY
ITT CORPORATION
PRINTED IN CHINA 2-08
THE ITT ENGINEERED BLOCKS SYMBOL AND
ENGINEERED FOR LIFE ARE REGISTERED
TRADEMARKS OF ITT CORPORATION
CHECK VALVE INSTALLATION
The NRF/NBF-25 pump discharge nozzle is machined to
accept check valve P/N P86596. If a check valve is required
for the installation, insert the O-ring end of P86596 into the
discharge port of the pump body and hand press the check
valve body into place until it snaps in position.
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 circulators dry. Pump operation without water circulation
could result in pump and motor damage.
PERIODIC INSPECTION
Bell & Gossett NRF/NBF 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 present, 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.
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0102030405060
510
0123
40
30
20
10
0 (gpm)
(m3/hr)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-36
SPEED 1
SPEED 3
SPEED 2
SPEED 1
100
(kPa) (M) (FT)
50
0
10
5
0
0
0102030405060
510
0123
40
30
20
10
0 (gpm)
(m3/hr)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-45
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 1020 30405060
510
0123
40
30
20
10
0 (gpm)
(m3/hr
)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-25 WITH CHECK VALVE
SPEED 1
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 1020 30405060
510
0123
40
30
20
10
0 (gpm)
(m3/hr
)
(l/s)
PERFORMANCE CHARACTERISTIC CURVE
CENTRIFUGAL PUMP SERIES NRF-36
CENTRIFUGAL PUMP SERIES NRF-25 WITHOUT CHECK VALVE
SPEED 1
SPEED 3
SPEED 2