Grundfos LM Series Installation And Operating Instructions Manual

Single stage in-line centrifugal pumps

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Series LM/LP

Single Stage In-Line

Centrifugal Pumps

Installation and Operating Instructions

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Summary of Contents for Grundfos LM Series

Page 1: Table Of Contents
Series LM/LP Single Stage In-Line Centrifugal Pumps Installation and Operating Instructions Table of Contents: Page #’s Checking the Condition of the Pump ........2 Pre-Installation......2 Installation Procedures ..2-3 Electrical ......4-5 Starting the Pump ....5-6 Operating Parameters ..6-9 Troubleshooting ....
Page 2: Checking The Condition Of The Pump
Examine the components carefully to make sure no damage has occurred during shipment. The Grundfos LM/LP pump should remain in its shipping carton until it is ready to be installed. This carton is specially designed to protect it from damage. During unpacking and prior to installation, care should be taken to ensure the pump is not dropped or mishandled.
Page 3: Installation Procedures
Pipework Arrows on the flanges of the pump volute indicate the flow direction of water through the pump. Grundfos LM/LP model pumps can be mounted in either the vertical or horizontal position. The pump can be installed with the motor in all positions be- tween vertical and horizontal but the motor/pump shaft must never fall below the horizontal plane.
Page 4: Electrical
DO NOT START THE PUMP (EVEN TO CHECK THE DIRECTION OF ROTATION) UNTIL IT HAS BEEN FILLED WITH WATER. Severe damage may be caused to the pump if it is run dry. Motor Grundfos LM/LP Pumps are supplied with heavy-duty 1750 RPM (LM Mod- els) or 3450 RPM (LP Models), O.D.P, NEMA C frame motors selected to our rigid specifications. T.E.F.C. motors...
Page 5: Starting The Pump
Electrical Motor Protection A. Single-Phase Motors: With the exception of 7½ and 10 HP motors which require external protection, single phase LM/ LP pumps are equipped with multi-voltage, open-drip proof (O.D.P.) squirrel-cage induction motors with built-in thermal protection. B. Three-Phase Motors: LM/LP Pumps with three-phase motors must use the proper size and type of motor-starter to en- sure the motor is protected against damage from low voltage, phase failure, current imbalance and overloads. A properly sized starter with manual reset and ambient-compensated extra quick trip...
Page 6: Operating Parameters
Operating Parameters Grundfos LM/LP in-line centrifugal pumps installed in accordance with these instructions and sized for correct performance will operate efficiently and provide years of service. The pumps are produc- tion lubricated and do not require any external lubrication or inspection. The motors will require periodic lubrication as noted in the following Maintenance Section.
Page 7 Operating Parameters Maintenance Motor Lubrication Electric motors are pre-lubricated at the factory and do not require additional lubrication at start-up. Motors without external grease fittings do not require additional lubrication during the first 15,000 hours of operation. Motors with grease fittings should only be lubricated with approved types of grease. Do not over grease the bearings. Over greasing wills cause increased bearing heat and can result in bearing/motor failure. DO not mix petroleum grease and silicon grease in motor bearings. Frequency of Type of Service Greasing...
Page 8 Note: The shaft can only be raised approximately 0.20 inches (5mm). See Figure 5. Insert the Grundfos adjusting fork underneath the coupling and lower the coupling until it touches the adjusting fork. See Figure 6.
Page 9: Troubleshooting
Operating Parameters Regular Check-Ups At regular intervals, depending on the conditions and time of operation, the following checks should be made: Pump meets required performance and is operating smoothly and quietly; There are no leaks, particularly at the shaft seal; The motor is not overheating; Remove and clean all strainers or filters in the system; Verify the tripping of the motor overload protection; Check the operation of all controls. Check until control cycling twice and adjust if necessary; If the pump is not operated for unusually long periods, the unit should be maintained in ac- cordance with these instructions.
Page 10 Troubleshooting What it Means Insulation How to Measure Turn off power and disconnect the sup- Motors of all HP, voltage, phase Resistance and cycle duties have the same ply power leads in the pump terminal box. Using an ohm or mega ohm meter, value of insulation resistance. Resistance values for new mo- set the scale selector to Rx 100K and zero adjust the meter.
Page 11 Troubleshooting Problem Possible Cause Remedy Turn off power and discharge capacitor. The pump does Defective capacitor. Check with ohmmeter (RX-100K). When not run (Single-phase motors) the meter is connected to the capacitor, the needle should jump towards 0 ohms and slowly drift back to infinity ( ). Replace if defective. Pump is bound. Turn off power and manually rotate pump shaft.
Page 12 Troubleshooting Problem Possible Cause Remedy The pump runs P u m p i m p e l l e r o r Disassemble and inspect pump passage- ways. Remove any foreign materials found. but at reduced guide vane is capacity or does clogged. not deliver water If the proper drain plug is replaced with a Incorrect drain plug standard plug, water will recirculate internally.
Page 13 Troubleshooting Problem Possible Cause Remedy Check voltage at starter panel and motor. If Fuses blow or Low voltage. voltage varies more than ±10%, contact power circuit breakers company. Check wire sizing. or overload relays trip Cycle pump and measure amperage. Increase Motor overloads are heater size or adjust trip setting to a maximum set too low.
Page 14: Notes
Notes...
Page 15 Notes...
Page 16 GRUNDFOS’ factory or authorized service station, any product of GRUNDFOS’ manufacture. GRUNDFOS will not be liable for any costs of removal, installa- tion, transportation, or any other charges which may arise in connection with a warranty claim. Products which are sold but not manufactured by GRUNDFOS are subject to the warranty provided by the manufacturer of said products and not by GRUNDFOS’ warranty. GRUNDFOS will not be liable for damage or wear...

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Lp series