Installation, Operation, and Maintenance Manual NRF™-25,36,45/NBF™-25,36, and 45 Circulator
Table of Contents Table of Contents Introduction and Safety.........................................................................................................................2 Introduction..........................................................................................................................................2 Requesting other information.........................................................................................................2 Safety....................................
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.
Introduction and Safety 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.
Introduction and Safety • 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.
Introduction and Safety Condition Chemicals or hazardous fluids on skin Action 1. 2. 3. Remove contaminated clothing. Wash the skin with soap and water for at least 1 minute. Seek medical attention, if necessary. Environmental safety The work area Always keep the station clean to avoid and/or discover emissions. Waste and emissions regulations Observe these safety regulations regarding waste and emissions: • Appropriately dispose of all waste.
Introduction and Safety Xylem assumes no liability for these situations: • Bodily injuries • Material damages • Economic losses Warranty claim 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.
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.
Product Description 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.
Installation Installation Pump location guidelines Guideline Explanation/comment Make sure that the space around the pump is sufficient. 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. Pump orientation You can install this pump to discharge up, down, left, or right.
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.
Installation CAUTION: Make sure that all wiring is rated to withstand at least 194°F (90°C). 1. 2. 3. 4. Remove the screws that secure the conduit box cover. Lift off the cover. Attach the appropriately sized connector to the hole in the side of the conduit box. 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.
Installation 1 1. 2. 2 Line lead 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. 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.
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 high-temperature fluids.
Commissioning, Startup, Operation, and Shutdown 1. 2. 3. Minimum speed Medium speed 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 (kPa) (M) (FT) 40 100 CENTRIFUGAL PUMP SERIES NRF-36 10 30 20 50 SPEED 3 5 SPEED 2 10 0 0 0 SPEED 1 0 10 20 0 30 40 5 0 50 60 (gpm) 10 1 2 (m3/hr ) (l/s) 3 Figure 6: Centrifugal pump series NRF-25 with check valve (kPa) (M) (FT) 40 100 CENTRIFUGAL PUMP SERIES NRF-36 10 30 20 50 SPEED 3 5 SPEED 2 10 SPEED 1 0 0 0 0 10 20 0 0 30 40 5 1 50 10 2 60 (gpm) (m3/hr) 3 (l/s) Figure 7: Centrifugal pump series NRF-25 wit
Maintenance 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.
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. Check all related low and line voltage circuits. Air-bound system Vent the system. The impeller or piping is clogged. Locate and remove the obstruction. The impeller is damaged. Replace pump.
Troubleshooting Symptom Cause There are seal failures within a 1–year Excessive dirt, sand and oxides period or less in a closed system. Excessive or improper water treatment Pump Cavitation: 1. Improper selection 2. Compression tank location There is seal pitting, oxygen corrosion, magnetic iron oxide. Remedy Clean the system. Check for proper water treatment recommendations from pump manufacturer. 1. 2.
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