Lowara GMD20 - User Manual

Questions and Answers

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Jennifer ThomasAug 19, 2025
Why Lowara Extender motor runs but no water is delivered?
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  bsmithAug 19, 2025
  If the Lowara Extender motor runs but no water comes out, there might be several reasons. First, ensure there is water available on the suction side and inside the pump by filling the pump or suction piping and opening any on-off valves. Second, check for air in the suction piping or pump and bleed the pump, inspecting the suction connections. Also, verify that there is no loss of pressure on the suction side, checking the NPSH and modifying the system if needed. Furthermore, inspect the check valve to ensure it is not jammed and clean it if necessary. Clear any clogs in the pipe. Finally, for three-phase motors, confirm the rotation is correct and change the direction of rotation if it's not.
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Emily BrownAug 21, 2025
What to do if Lowara Extender motor does not start?
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  Brandon FergusonAug 21, 2025
  If the Lowara Extender motor isn't starting, first ensure the power supply is properly connected. If that's not the issue, check for triggering of the motor protector and eliminate any malfunctions. For single-phase motors, the motor thermal protector may have triggered; wait for it to reset automatically. For three-phase motors, check the automatic switch in the electric panel and reset it if necessary. Finally, if none of these steps work, the motor itself may be defective and require repair or replacement.
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Melissa HerreraAug 25, 2025
How to fix frequent startups and stops of Lowara Extender?
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  Seth BrownAug 25, 2025
  Frequent startups and stops of the Lowara Extender can be caused by a defective tank, which would require repair or replacement. Another potential cause is an incorrect pressure switch adjustment. To resolve this, increase the differential pressure or the stop pressure.
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Kelly GravesAug 26, 2025
What to do if Lowara Extender pump leaks water?
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  Vincent KellyAug 26, 2025
  If the Lowara Extender pump is leaking water, it could be due to a defective mechanical seal, which would need to be replaced. Another possible cause is undue mechanical stress on the pump. In this case, ensure that the pipes are properly supported.
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Victoria SanchezAug 28, 2025
Why Lowara Extender motor starts then stops immediately?
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  Ryan PatrickAug 28, 2025
  If the Lowara Extender motor starts briefly and then stops, it might be due to an incorrect tank precharge pressure; check the tank precharge. Another possible cause is an incorrect pressure switch adjustment. To fix this, increase the differential pressure or the stop pressure.
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Jason JonesAug 30, 2025
Why is my Lowara Extender too noisy?
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  christinehallAug 30, 2025
  Excessive noise in the Lowara Extender could be due to water return when pumps stop; check the check valve. Cavitation could also be the cause; check the suction. Finally, the pump rotation may be hindered; check for undue mechanical stress on the pump.
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Chad McculloughSep 1, 2025
How to troubleshoot Lowara Extender set if it is off?
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  mollyharrellSep 1, 2025
  If the Lowara Extender set is off, first check if the power supply is disconnected and connect it. If the issue persists, the fuse may be blown; replace it.
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jbutlerSep 3, 2025
What to do if Lowara Water Pump motor runs but no water is delivered?
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  William GonzalezSep 3, 2025
  If your Lowara Water Pump motor runs but no water comes out, several issues could be the cause. First, ensure there is water on the suction side or inside the pump; fill the pump or suction piping and open any on-off valves. Second, check for air in the suction piping or pump; bleed the pump and inspect the suction connections. Also, verify there isn't a loss of pressure on the suction side by checking the NPSH and modifying the system if necessary. Finally, inspect for a jammed check valve (clean it), a clogged pipe (clean it), or incorrect rotation of three-phase motors (change the direction of rotation).
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Lynn CollinsSep 5, 2025
Why my Lowara Water Pump motor does not start?
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  Charles RamirezSep 6, 2025
  If your Lowara Water Pump motor doesn't start, there could be several reasons: * Check if the power supply is disconnected and connect it. * The motor protector might be triggered; eliminate the malfunction. * For single-phase motors, the thermal protector may have tripped; wait for an automatic reset. * For three-phase motors, the automatic switch in the electric panel might have tripped; reset the automatic switch. * The motor could be defective, requiring repair or replacement.
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Emily Anderson DVMSep 8, 2025
How to fix Lowara Water Pump if the set is off?
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  amanda73Sep 8, 2025
  If your Lowara Water Pump set is off, it might be due to a disconnected power supply. In this case, connect the power supply. Alternatively, a blown fuse could be the reason; if so, replace the fuse.

Summary

Safety Warnings and Symbols

General Safety Instructions

Explanation of warning symbols and their consequences for safety.

Product Overview

Product Description

Pump Operation Principles

Control Panel Descriptions

Installation Guide

Piping and Electrical Connections

Guidelines for connecting pipes and electrical wiring.

Installation Safety Precautions

Warnings and procedures for safe installation, including dry running.

Tank Selection and Air Feeder

Information on tank requirements and air feeder connection.

Settings and Adjustments

Operation and Pressure Switch Settings

How to set operating parameters and pressure switches.

Startup Procedures

Control Card Adjustments and Tank Precharge

Details on electronic card settings and membrane tank precharging.

How to Modify Settings

Step-by-step guide to adjust system settings after initial startup.

Maintenance Guide

Maintenance Procedures

Instructions for pump, panel, and tank maintenance.

Components List

Repair and Spare Parts

Troubleshooting Common Issues

Disposal Guidelines

Technical Specifications

Lowara GMD20 Specifications

General

Model	GMD20
Category	Water Pump
Brand	Lowara
Type	Multistage Centrifugal Pump
Maximum Liquid Temperature	40 °C
Shaft Material	Stainless Steel
Seal Type	Mechanical Seal
Application	Water supply, irrigation
Voltage	230V / 400V
Frequency	50 Hz