Lowara GXS20 - User Manual

Questions and Answers

M
margaret49Aug 1, 2025
What to do if Lowara Water Pump motor runs but no water is delivered?
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  Matthew MooreAug 1, 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).
K
Kayla HuntAug 5, 2025
Why my Lowara Water Pump motor does not start?
- R
  Renee JenningsAug 5, 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.
E
edwardsbryanAug 10, 2025
How to fix Lowara Water Pump if the set is off?
- A
  anne75Aug 10, 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.
Y
yhardyAug 13, 2025
Why does my Lowara Water Pump have frequent startups and stops?
- M
  millerstephanieAug 14, 2025
  Frequent startups and stops in your Lowara Water Pump can be due to a defective tank, in which case you should repair or replace the tank. Another possible cause is an incorrect pressure switch adjustment; try increasing the differential pressure or the stop pressure.
D
Dawn AlvarezAug 18, 2025
How to stop Lowara Water Pump from leaking water?
- M
  Michelle NelsonAug 18, 2025
  If your Lowara Water Pump leaks water, it could be due to a defective mechanical seal, which would require replacing the mechanical seal. Another possible cause is undue mechanical stress on the pump; ensure you support the pipes to alleviate this stress.
E
Elizabeth ButlerAug 22, 2025
What to do if Lowara Water Pump motor starts then stops immediately?
- Y
  Yvonne DunnAug 22, 2025
  If the motor of your Lowara Water Pump starts but stops immediately, it could be due to an incorrect tank precharge pressure. You should check the tank precharge. Another possible reason is an incorrect pressure switch adjustment; try increasing the differential pressure or the stop pressure.
E
Ellen CookAug 27, 2025
Why is my Lowara Water Pump too noisy?
- A
  Anthony EverettAug 27, 2025
  If your Lowara Water Pump is too noisy, it could be due to water returning when the pump stops; check the check valve. Another cause could be cavitation, so check the suction. Also, the pump rotation might be hindered; check for undue mechanical stress on the pump.

Summary

2-PUMP BOOSTER SETS

Installation and Operating Instructions

Guidance for setting up and using the 2-pump booster sets.

General Safety Warnings

Hazard Symbols Explained

Explanation of hazard symbols like Danger, Electric Shock, and Warning.

Key Safety Precautions

Key safety instructions for installation, operation, and maintenance.

Product Overview

Product Description

Details the components of the pressure booster set, including pumps, manifolds, and control panel.

Pump Operation

Explains how the pumps are controlled based on pressure and water demand.

GXS20 Single-Phase Features

Lists features of the GXS20 single-phase unit, including control panels and protective functions.

QXS20 Control Panel

Details the components and functions of the QXS20 control panel.

GMS20; GMD20 Model Features

Describes features of GMS20 and GMD20 single-phase and three-phase versions.

QMS20;QMD20 Control Panel

Details the components and functions of the QMS20/QMD20 control panel.

Installer Information

Installation Guide

Guidance on handling, placement, and piping for the pressure booster set.

Dry Running Protection Setup

Details on connecting protection devices and their operational status.

Maximum Pressure Protection

Information on overpressure protection for three-phase panels.

Tank Selection and Precharge

Guidance on connecting a membrane tank and calculating optimal volume.

Air Feeder Connection

Information on connecting an air feed device to the pressure booster sets.

Electrical Connection Safety

Safety warnings and requirements for electrical connections by qualified electricians.

5. Settings

Pump Operation Settings

Explains how pump start/stop is determined by pressure switch settings.

Pressure Switch Adjustment

Details factory settings and modification of pressure switches for system conditions.

5. Settings

Electronic Control Card Settings

Instructions for modifying settings on the electronic control card.

Tank Precharge Procedure

Procedure for precharging the membrane tank to the minimum activation pressure.

6. Startup

Startup Settings Adjustment

Procedure to modify settings after the initial startup sequence.

7. Maintenance

Pump Maintenance

Reference to the electric pump instruction manual for maintenance.

Panel Maintenance

States that electric panels do not require maintenance.

Tank Maintenance

Guidance on checking membrane tank precharge annually.

8. Components List

9. Repair and Spare Parts

10. Troubleshooting

11. Disposal

12. Specifications

Company Headquarters

Lowara GXS20 Specifications

General

Model	GXS20
Type	Submersible Pump
Maximum Flow Rate	20 m³/h
Power	1.5 kW
Voltage	230 V
Frequency	50 Hz
Weight	20 kg
Maximum Liquid Temperature	35 °C
Impeller Type	Vortex
Material	Cast Iron