Installation, Operation,
and Maintenance Manual
™
NRF
-25,36,45/
™
NBF
-25,36, and 45
Circulator
Table of Contents
Introduction and Safety..................................................................................................................2
Introduction..................................................................................................................................2
Safety.............................................................................................................................................2
Safety terminology and symbols........................................................................................... 2
User safety................................................................................................................................ 3
Environmental safety...............................................................................................................4
Product warranty......................................................................................................................5
Transportation and Storage.......................................................................................................... 6
Inspect the delivery.....................................................................................................................6
Inspect the package................................................................................................................6
Inspect the unit........................................................................................................................ 6
Pump storage requirements...................................................................................................... 6
Product Description........................................................................................................................7
General description.................................................................................................................... 7
Operational specifications......................................................................................................... 7
Table of Contents
Installation........................................................................................................................................8
Pump location guidelines...........................................................................................................8
Pump orientation.........................................................................................................................8
Change the conduit position..................................................................................................... 8
Install suction and discharge flange connectors on the pipe ends...................................... 9
Connect the wiring......................................................................................................................9
Wiring diagram......................................................................................................................10
Install a check valve...................................................................................................................10
Commissioning, Startup, Operation, and Shutdown...............................................................12
Pump operation precautions...................................................................................................12
Prepare the system................................................................................................................... 12
Start the pump...........................................................................................................................12
Select the speed........................................................................................................................12
Performance characteristic curve............................................................................................13
Maintenance..................................................................................................................................15
Periodic inspection................................................................................................................... 15
Remove the pump from an existing system...........................................................................15
Troubleshooting........................................................................................................................... 16
Pumping system troubleshooting...........................................................................................16
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 1
Introduction and Safety
Introduction and Safety
Introduction
Purpose of this manual
The purpose of this manual is to provide necessary information for:
• Installation
• Operation
• Maintenance
CAUTION:
Read this manual carefully before installing and using the product. Improper use of the
product can cause personal injury and damage to property, and may void the warranty.
NOTICE:
Save this manual for future reference, and keep it readily available at the location of the
unit.
Requesting other information
Special versions can be supplied with supplementary instruction leaflets. See the sales
contract for any modifications or special version characteristics. For instructions,
situations, or events that are not considered in this manual or in the sales documents,
please contact the nearest Xylem representative.
Always specify the exact product type and identification code when requesting technical
information or spare parts.
Safety
WARNING:
• The operator must be aware of safety precautions to prevent physical injury.
• Any pressure-containing device can explode, rupture, or discharge its contents if it is
over-pressurized. Take all necessary measures to avoid over-pressurization.
• Operating, installing, or maintaining the unit in any way that is not covered in this
manual could cause death, serious personal injury, or damage to the equipment. This
includes any modification to the equipment or use of parts not provided by Xylem. If
there is a question regarding the intended use of the equipment, please contact a
Xylem representative before proceeding.
• Do not change the service application without the approval of an authorized Xylem
representative.
CAUTION:
You must observe the instructions contained in this manual. Failure to do so could result
in physical injury, damage, or delays.
Safety terminology and symbols
About safety messages
It is extremely important that you read, understand, and follow the safety messages and
regulations carefully before handling the product. They are published to help prevent
these hazards:
2 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Hazard levels
• Personal accidents and health problems
• Damage to the product
• Product malfunction
Hazard level Indication
DANGER:
A hazardous situation which, if not avoided, will result in
death or serious injury
Introduction and Safety
Hazard categories
WARNING:
CAUTION:
NOTICE:
Hazard categories can either fall under hazard levels or let specific symbols replace the
ordinary hazard level symbols.
Electrical hazards are indicated by the following specific symbol:
Electrical Hazard:
These are examples of other categories that can occur. They fall under the ordinary
hazard levels and may use complementing symbols:
• Crush hazard
• Cutting hazard
• Arc flash hazard
A hazardous situation which, if not avoided, could result
in death or serious injury
A hazardous situation which, if not avoided, could result
in minor or moderate injury
• A potential situation which, if not avoided, could
result in undesirable conditions
• A practice not related to personal injury
User safety
General safety rules
These safety rules apply:
• Always keep the work area clean.
• Pay attention to the risks presented by gas and vapors in the work area.
• Avoid all electrical dangers. Pay attention to the risks of electric shock or arc flash
hazards.
• Always bear in mind the risk of drowning, electrical accidents, and burn injuries.
Safety equipment
Use safety equipment according to the company regulations. Use this safety equipment
within the work area:
• Hard hat
• Safety goggles, preferably with side shields
• Protective shoes
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 3
Introduction and Safety
• Protective gloves
• Gas mask
• Hearing protection
• First-aid kit
• Safety devices
Electrical connections
Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local regulations. For more information about
requirements, see sections dealing specifically with electrical connections.
Precautions before work
Observe these safety precautions before you work with the product or are in connection
with the product:
• Provide a suitable barrier around the work area, for example, a guard rail.
• Make sure that all safety guards are in place and secure.
• Make sure that you have a clear path of retreat.
• Make sure that the product cannot roll or fall over and injure people or damage
• Make sure that the lifting equipment is in good condition.
• Use a lifting harness, a safety line, and a breathing device as required.
• Allow all system and pump components to cool before you handle them.
• Make sure that the product has been thoroughly cleaned.
• Disconnect and lock out power before you service the pump.
• Check the explosion risk before you weld or use electric hand tools.
NOTICE:
Never operate a unit unless safety devices are installed. Also see specific information
about safety devices in other chapters of this manual.
property.
Wash the skin and eyes
Follow these procedures for chemicals or hazardous fluids that have come into
contact with your eyes or your skin:
Condition Action
Chemicals or hazardous fluids in
eyes
Chemicals or hazardous fluids on
skin
Environmental safety
The work area
Always keep the station clean.
Waste and emissions regulations
Observe these safety regulations regarding waste and emissions:
• Appropriately dispose of all waste.
• Handle and dispose of the processed liquid in compliance with applicable
environmental regulations.
• Clean up all spills in accordance with safety and environmental procedures.
• Report all environmental emissions to the appropriate authorities.
1. Hold your eyelids apart forcibly with your fingers.
2. Rinse the eyes with eyewash or running water for at least 15 minutes.
3. Seek medical attention.
1. Remove contaminated clothing.
2. Wash the skin with soap and water for at least 1 minute.
3. Seek medical attention, if necessary.
4 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Electrical installation
Recycling guidelines
Product warranty
Coverage
Introduction and Safety
WARNING:
Radiation Hazard. Do NOT send the product to Xylem if it has been exposed to any
nuclear radiation.
For electrical installation recycling requirements, consult your local electric utility.
Always follow local laws and regulations regarding recycling.
Xylem undertakes to remedy defects in products from Xylem under these conditions:
• The faults are due to defects in design, materials, or workmanship.
• The faults are reported to an local sales and service representative within the warranty
period.
• The product is used only under the conditions described in this manual.
• The monitoring equipment incorporated in the product is correctly connected and in
use.
• All service and repair work is done by Xylem authorized personnel.
• Genuine Xylem parts are used.
• Only Ex-approved spare parts and accessories authorized by an EX-approved Xylem
representative are used in Ex-approved products.
Limitations
Warranty claim
The warranty does not cover defects caused by these situations:
• Deficient maintenance
• Improper installation
• Modifications or changes to the product and installation made without consulting an
Xylem authorized representative
• Incorrectly executed repair work
• Normal wear and tear
Xylem assumes no liability for these situations:
• Bodily injuries
• Material damages
• Economic losses
Xylem products are high-quality products with expected reliable operation and long life.
However, should the need arise for a warranty claim, then contact your local sales and
service representative.
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 5
Transportation and Storage
Transportation and Storage
Inspect the delivery
Inspect the package
1. Inspect the package for damaged or missing items upon delivery.
2. Note any damaged or missing items on the receipt and freight bill.
3. File a claim with the shipping company if anything is out of order.
If the product has been picked up at a distributor, make a claim directly to the
distributor.
Inspect the unit
1. Remove packing materials from the product.
Dispose of all packing materials in accordance with local regulations.
2. Inspect the product to determine if any parts have been damaged or are missing.
3. If applicable, unfasten the product by removing any screws, bolts, or straps.
For your personal safety, be careful when you handle nails and straps.
4. Contact the local sales representative if there is any issue.
Pump storage requirements
Storage requirements depend on the amount of time that you store the unit. The normal
packaging is designed only to protect the unit during shipping.
Length of time in storage Storage requirements
Upon receipt/short-term (less than six months) • Store in a covered and dry location.
Long-term (more than six months) • Store in a covered and dry location.
• Store the unit free from heat, dirt, and vibrations.
6 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Product Description
General description
The NRF/NBF circulator pump has these features:
• System liquid lubricated bearings
• Non-overloading permanent split capacitor motor with thermal or impedance
protection
• Quiet operation
• Nonsubmersible
Pump application
WARNING:
California Proposition 65 warning! This product contains chemicals known to the state of
California to cause cancer and birth defects or other reproductive harm.
You can use this pump for these types of applications:
• Water circulating applications in hydronic and solar systems.
• Indoor use only
Do not use in swimming pools and marine areas.
Xylem recommends that you use bronze or stainless steel booster pumps for pumping
potable water. For other applications, contact your local sales and service representative.
Product Description
Operational
Operational Limits
Electrical Rating
specifications
These pumps are designed to pump liquids compatible with their iron or bronze body
constructions.
Parameter Value
Maximum operating pressure 150 PSI (10 bars)
Maximum operating temperature 225˚F (107˚C)
115V, 60Hz, 1Ø; 230V, 60Hz, 1Ø (single phase power)
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 7
Installation
Installation
Pump location guidelines
Guideline Explanation/comment
Make sure that the space
around the pump is sufficient.
Pump orientation
You can install this pump to discharge up, down, left, or right. However, make sure that
you install the pump according to these pump orientation guidelines:
• Only install the pump with the motor shaft horizontal.
• The arrow on the pump body must point in the direction of the flow.
• You must position the conduit box on the top or to the side of the motor housing. If
you need to change the position of the conduit box, change it before you start the
installation. If the pump is already installed, see Remove the pump from an existing
system (page 15) before proceeding.
This facilitates ventilation, inspection, maintenance, and service. Xylem
recommends that the service valves on the suction and discharge of all circulators
are installed so they can be serviced or replaced without draining the system.
Change the conduit position
CAUTION:
Burn or projectile hazard. Make sure the power is turned off before placing anything
inside the discharge opening to move the impeller.
Figure 1: Conduit box position
1. While supporting the motor assembly, use a 3/16 wrench in order to remove the four
1/4-20 Allen screws.
2. Remove the motor assembly from the pump body and rotate it to the desired
position.
3. Replace the Allen screws and tighten them evenly in a diagonal method to 60 in-lbs.
4. Check to see that the impeller turns freely. Insert your
the pump body until you can feel the impeller and rotate it with your fingertip.
The arrow on the pump body points in the direction of the discharge. If the impeller
does not turn easily, repeat the disassembly/ reassembly process.
finger in the discharge port of
8 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Installation
Install suction and discharge flange connectors on the pipe ends
WARNING:
• Burn hazard. Make sure that each flange gasket remains seated in the flange groove
during and after installation.
• Burn hazard. Do NOT re-use old gaskets. When disassembling a gasketed joint,
always use a new gasket upon reassembly.
1. Use pipe hangers near the pump in order to support the suction and discharge
piping.
This minimizes pipe strain on the pump.
2. Install the
discharge pipe flanges.
Use a 7/16 in. x 1-1/2 in. capscrew and a matching nut in order to connect the pump
to the flanges. The use of PTFE tape sealer or a high quality thread sealant is
recommended.
flange gaskets between the pump body flanges and the suction and
CAUTION:
Burn hazard. The use of PTFE impregnated pipe and PTFE tape on
pipe threads provides lubricity which can lead to overtightening and
breaks. Do not overtighten.
3. Line up the vertical and horizontal piping so that the bolt holes in the pump flanges
match the bolt-holes in the pipe flanges.
NOTICE:
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.
4. Evenly torque the suction and discharge flange bolts to 115 in-lbs (12 Nm).
Connect the wiring
WARNING:
Disconnect and lock out electrical power before installing or servicing the unit.
Electrical Hazard:
Make sure that all connections are secure and the conduit box cover is closed before you
connect the electrical power.
WARNING:
Burn hazard. Make sure that the flange bolts or ring nuts have been
properly tightened and that the solder connections do not leak.
CAUTION:
Make sure that all wiring is rated to withstand at least 194°F (90°C).
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 9
S
1
2
3
4
L
N
1
2
Installation
Wiring diagram
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.
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. 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.
10 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Installation
1. Insert the O-ring end of the check valve into the discharge port of the pump body.
2. Hand press the check valve body into place until it snaps into position.
NOTICE:
CAUTION: PROPERTY DAMAGE HAZARD. It is not advisable to install circulators in an
attic or upper floor over finished living space. If the circulator must be installed over head,
or over expensive equipment, provide adequate drainage in the event of leakage. Failure
to follow these instructions could result in property damage.
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 11
Commissioning, Startup, Operation, and Shutdown
Commissioning, Startup, Operation,
and Shutdown
Pump operation precautions
WARNING:
• Do NOT exceed the maximum working pressure of the pump. This information is
listed on the nameplate of the pump.
• The heating of water and other fluids causes volumetric expansion. The associated
forces can cause the failure of system components and the release of hightemperature fluids. In order to prevent this, install properly sized and located
compression tanks and pressure-relief valves. Failure to follow these instructions can
result in serious personal injury or death, or property damage.
• Make sure that all components are properly guarded or insulated when operating at
extremely high or low temperatures.
• Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local rules.
Electrical Hazard:
Do NOT install this pump in swimming pools or marine areas. Failure to follow these
instructions could result in serious personal injury, death and/or property damage.
Prepare the system
1. Clean and drain closed heating and cooling systems.
2. Refill the system with clean water.
The system fluid pH must be maintained between 7 and 9.
Start the pump
WARNING:
Pressurize the pump body slowly while you check for leaks at all gasketed joints and
solder connections.
Do not start pump until you fill and vent the system.
1. Vent air 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.
2. Make sure the pump is filled with clean water.
Do not run the pump dry. Pump operation without water circulation can result in
pump and motor damage.
Select the speed
The pump can be run at different speeds to suit the required operating conditions.
Select the speed by adjusting the three-position switch on the side of the terminal
box.
12 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
1. Minimum speed
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 10 20 30 40 50 60
015
3210
40
30
20
10
0
(gpm)
(m3/hr)
(l/s)
CENTRIFUGAL PUMP SERIES NRF-36
SPEED 1
SPEED 3
SPEED 2
SPEED 1
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 10 20 30 40 50 60
015
3210
40
30
20
10
0
(gpm)
(m3/hr)
(l/s)
2. Medium speed
3. Maximum speed
Performance characteristic curve
Select the speed that best matches the design performance for the system
or loop for which you are installing the pump.
Commissioning, Startup, Operation, and Shutdown
Figure 4: Centrifugal pump series NRF-36
Figure 5: Centrifugal pump series NRF-45
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 13
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 10 20 30 40 50 60
015
3210
40
30
20
10
0
(gpm)
(m3/hr )
(l/s)
CENTRIFUGAL PUMP SERIES NRF-36
SPEED 1
SPEED 3
SPEED 2
100
(kPa) (M) (FT)
50
0
10
5
0
0
0 10 20 30 40 50 60
015
3210
40
30
20
10
0
(gpm)
(m3/hr)
(l/s)
CENTRIFUGAL PUMP SERIES NRF-36
SPEED 1
SPEED 3
SPEED 2
Commissioning, Startup, Operation, and Shutdown
Figure 6: Centrifugal pump series NRF-25 with check valve
Figure 7: Centrifugal pump series NRF-25 without check valve
14 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Maintenance
Periodic inspection
• It is recommended that periodic inspections be made to check for potential problems
with the pump.
• If any leaks or evidence of leakage is present, repair or replace the unit.
Remove the pump from an existing system
WARNING:
• Make sure that the pump is isolated from the system and that pressure is relieved
before you disassemble the pump, remove plugs, open vent or drain valves, or
disconnect the piping.
• Always disconnect and lock out power to the driver before you perform any
installation or maintenance tasks. Failure to disconnect and lock out driver power will
result in serious physical injury.
• Burn hazard. Do NOT re-use old gaskets. When disassembling a gasketed joint,
always use a new gasket upon reassembly.
Maintenance
1. Close the valves on the suction and discharge sides of the pump.
If no valves are installed, you might need to drain the system.
2. Drain the system:
WARNING:
Allow all system and pump components to cool before you handle
them to prevent physical injury.
a) Allow the water to cool to at least 100°F (38°C).
b) Take precautions against water damage, and then open the drain valve.
c) Leave the drain valve open until servicing is complete.
Electrical Hazard:
Make sure the electrical power is not present at the motor leads before
continuing.
3. Loosen the screws on the conduit box and remove the cover.
4. Disconnect the electrical supply lines to the pump.
5. Relieve pressure in the pump body.
WARNING:
Pressurized device. Relieve any contained pressure in the pump body
by loosening the flange bolts and shifting the pump assembly slightly
to allow the pressurized water to escape.
6. Remove the flange nuts and bolts or loosen the union ring nuts. Then remove the
pump from the piping
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 15
Troubleshooting
Troubleshooting
Pumping system troubleshooting
Symptom Cause Remedy
There is no circulation Air-bound system Vent the system
The impeller or piping is clogged. Locate and remove the obstruction.
The system valve is closed. Open
The electrical circuit for the pump is
broken.
There is inadequate circulation. Air-bound system Vent the system.
The impeller or piping is clogged. Locate and remove the obstruction.
The impeller is damaged. Replace pump.
The pump is too small. Replace the pump if single speed. If
Partially air-bound pump Vent the pump casing.
Improper motor speed Check the wiring and the voltage.
There is pump or system noise. Entrained air Vent the system.
Pump cavitation Lower the pump or raise pressure or
Excessive water velocity Install balancing cocks or parallel
Pipe vibration Provide adequate pipe support.
There is premature failure of pump
components.
There are seal failures within a 1–year
period or less in a closed system.
There is seal pitting, oxygen
corrosion, magnetic iron oxide.
Improper pump (size/type) Replace
Improper pump location Relocate
Excessive water treatment Check the manufacturer’s
Pump operating close to or beyond
the end point of curve.
Excessive piping load Provide proper pipe support
Excessive dirt, sand and oxides Clean the system.
Excessive or improper water
treatment
Pump Cavitation:
1. Improper selection
2. Compression tank location
Excessive temperatures Check the type of seal and maximum
Pumps run without fluid Pumps must be primed before
Caused by wear and excessive
amounts of free oxygen.
Fresh water feeding carries oxygen
into the system.
Check all related low and line voltage
circuits.
three speed switch to higher setting.
relocate (see note below).
piping.
instructions.
Balance the system.
Check for proper water treatment
recommendations from pump
manufacturer.
1. Check pump operation on its
curve — overloading
2. High head pump must have
compression tank on suction
side of pump.
operating temperature from the
manufacturer.
operation.
Check if system has a constant leak.
16 NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual
Troubleshooting
NOTICE:
Cavitation is identified by low rumbling or sharp rattling noises. This situation is created
by the lack of available net positive suction head (NPSH). The pressure at some point in
the pump falls below the vapor pressure of the water causing flashing and the formation
of bubbles, which are carried into the volute where the higher pressure causes them to
implode. This can eventually destroy the pump.
NRF™-25,36,45/NBF™-25,36, and 45 Circulator Installation, Operation, and Maintenance Manual 17
Xylem |’zīləm|
1) The tissue in plants that brings water upward from the roots
2) A leading global water technology company
We're 12,000 people unified in a common purpose: creating innovative
solutions to meet our world's water needs. Developing new technologies that
will improve the way water is used, conserved, and re-used in the future is central
to our work. We move, treat, analyze, and return water to the environment, and
we help people use water efficiently, in their homes, buildings, factories and
farms. In more than 150 countries, we have strong, long-standing relationships
with customers who know us for our powerful combination of leading product
brands and applications expertise, backed by a legacy of innovation.
For more information on how Xylem can help you, go to xyleminc.com
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, IL 60053
Tel: 1-847-966-3700
Fax: 1-847-965-8379
www.bellgossett.com
Visit our Web site for the latest version of this document
and more information
The original instruction is in English. All non-English
instructions are translations of the original instruction.
©
2013 Xylem Inc
Bell & Gossett is a trademark of Xylem Inc or one of its
subsidiaries.
P86203_F_en.US_2013-02_IOM.NRF
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