Xylem Bell & Gossett NRF-25, Installation, Operation And Maintenance Manual

Page 1: ...Installation Operation and Maintenance Manual NRF 25 36 45 NBF 25 36 and 45 Circulator...

Page 2: ......

Page 3: ...ump 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...

Page 4: ...cautions 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 Oper...

Page 5: ...re 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...

Page 6: ...fore 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 tool...

Page 7: ...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...

Page 8: ...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 representativ...

Page 9: ...g 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 wat...

Page 10: ...installation If the pump is already installed see Remove the pump from an existing system page 15 before proceeding Change the conduit position CAUTION Burn or projectile hazard Make sure the power i...

Page 11: ...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 disc...

Page 12: ...ounded 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 c...

Page 13: ...D 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 i...

Page 14: ...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...

Page 15: ...5 0 0 0 10 20 30 40 50 60 0 1 5 3 2 1 0 40 30 20 10 0 gpm m3 hr l s CENTRIFUGAL PUMP SERIES NRF 36 SPEED 1 Figure 4 Centrifugal pump series NRF 36 SPEED 3 SPEED 2 SPEED 1 100 kPa M FT 50 0 10 5 0 0 0...

Page 16: ...series NRF 25 with check valve 100 kPa M FT 50 0 10 5 0 0 0 10 20 30 40 50 60 0 1 5 3 2 1 0 40 30 20 10 0 gpm m3 hr l s CENTRIFUGAL PUMP SERIES NRF 36 SPEED 1 SPEED 3 SPEED 2 Figure 7 Centrifugal pump...

Page 17: ...mp 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 w...

Page 18: ...re of pump components Improper pump size type Replace Improper pump location Relocate Excessive water treatment Check the manufacturer s instructions Pump operating close to or beyond the end point of...

Page 19: ...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...

Page 20: ...s 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...