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onga SMH75 - User Manual

onga SMH75
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OWNER’S MANUAL
Should you the installer or owner be unfamiliar with the correct
installation or operation of this type of equipment you should contact
the distributor/manufacturer for the correct advice before proceeding
with the installation or operation of this product.
We recommend, for additional protection, the pump
to be supplied from socket outlet protected by
a residual current device – RCD (also known as
an Earth Leakage Circuit Breaker – ELCB) with a
maximum rated residual current of 30mA.
Horizontal Multistage
Centrifugal Pumps
SMH Range
SMH35 SMH45 SMH55 SMH75 SMH90

Table of Contents

Questions and Answers

  • K
    kanemelissaAug 9, 2025
    What to do if my onga SMH75 Water Pump operates but delivers no water?
    • J
      James ChaneyAug 9, 2025
      If your Onga Water Pump runs but doesn't deliver water, several issues could be the cause. First, ensure the pump is filled with water. Next, the suction head might be too high, or the foot valve/strainer isn't submerged enough; try lengthening the suction pipe, but no more than 8 meters. Check for air leaks in the suction pipe and joints. Also, the suction pipe/strainer or non-return valves might be clogged with debris, or the pump itself might be clogged. Cleaning these components may resolve the issue.
  • K
    Kevin JohnsonAug 15, 2025
    Why my onga SMH75 does not operate and the motor does not run?
    • J
      James DavisAug 15, 2025
      If your Onga Water Pump isn't operating and the motor isn't running, there are a few potential causes. First, verify that there is electricity available to the pump. Next, make sure the pump is plugged in correctly. Finally, check if the circuit breaker has been activated, and if so, reset it.
  • P
    paul19Aug 23, 2025
    How to troubleshoot reduced performance in onga SMH75 Water Pump?
    • H
      Heather DavenportAug 23, 2025
      To troubleshoot reduced performance in your Onga Water Pump, consider these potential causes: the suction head might be too high, so reduce it. If the foot valve/strainer is only partially submerged, try lengthening the suction pipe. A worn or damaged pump shaft seal can cause this issue, so replace any defective parts. Debris partially blocking the pump can also reduce performance; remove any debris and flush the pump with clean water. Lastly, check the pressure switch settings and adjust them if they are incorrectly set, or replace faulty parts.
  • W
    Wendy DavidsonAug 30, 2025
    What to do if onga SMH75 Water Pump hums and the thermal relays cut in and out?
    • V
      Vanessa WhiteAug 30, 2025
      If your Onga Water Pump is humming and the thermal relays are cutting in and out, it could be due to a few reasons. The pump might be clogged by debris, in which case you should clean the suction pipe and foot valve/strainer. Flush the pump with water and remove the priming and drain plugs. If it still doesn't start, dismantle and clean it. Alternatively, the capacitor might be defective and need replacement.

Summary

Model Data

Technical Specifications

Details essential technical parameters including inlet/outlet size, temperature range, IP rating, and electrical supply.

Application

Pump Application Scope

Describes suitability for domestic water systems, irrigation, and as pressure booster pumps for clean water.

Installation

Preparation and Pump Protection

Inspect pump for damage, ensure clear suction piping, and protect from elements. Warranty may be void if not housed properly.

Pipe Installation and Support

Connect pipes carefully, support them to avoid straining the pump casing, and use recommended fittings.

Pump Location and Power Source

Locate the pump near the water source on a stable footing and ensure an outdoor 10A GPO is installed.

Suction Line Setup

Keep suction pipe short, use reinforced hose, ensure airtight fittings, and maintain adequate water submersion.

Discharge and Priming Procedures

Ensure discharge pipework meets pressure ratings and support it. Prime the pump by filling with water from the tank.

Electrical Connection and Safety

Connect the plug securely to a dry socket outlet, avoid extension cords, and use RCD protection for safety.

Operation

Pre-Operation Checks and Safety

Ensure the pump is primed, filled with clean water, and aware of fire hazards. Follow manual instructions.

Start-up and Motor Rotation

Start the pump after priming and verify the motor rotates clockwise when viewed from the fan.

D.R.O.P System Functionality

The D.R.O.P system protects pump parts from overheating, especially when running dry.

Restoring Operation After D.R.O.P Activation

Reset the D.R.O.P system by turning off, unplugging, removing the cause, waiting, and restarting.

Service and Maintenance

Safety Precautions for Servicing

Only qualified personnel should service. Turn off power, handle hot liquid carefully, and address RCD issues.

General Care and Preventative Checks

The pump requires minimal attention but periodic checks of pressure and power absorption can prevent failures.

Troubleshooting

Common Issues and Solutions

Provides a guide to diagnose and resolve common pump issues such as no operation, humming, no water delivery, or reduced performance.

Pentair Water Product Warranty

International Warranty Terms

Provides 12 months warranty on parts internationally from the date of purchase, excluding travel and reinstallation.

Australian & New Zealand Warranty

Offers 24 months warranty on parts and 12 months on labour in Australia/New Zealand, with specific conditions.

Warranty Coverage and Exclusions

Covers defects in material/workmanship but excludes damage from misuse, accidents, improper installation, and wear.

Spare Parts and Service Acquisition

Spare parts are stocked for a reasonable period. Service requires providing purchase proof and product details.

Warranty Limitations and Legal Aspects

Implied warranties are limited, liability is capped at repair/replacement cost, and specific legal rights apply.

Important Information and Contact Details

Proof of Purchase Requirement

Attach sales invoice/docket as proof of purchase for warranty service. Do not return warranty documents.

Company Contact Information

Provides contact details for Pentair Water offices in Australia, New Zealand, Americas, Europe, Asia, China, and India.

Disclaimer and Specifications

Information is proprietary. Reproduction is prohibited. Pentair Water reserves the right to change specifications.

onga SMH75 Specifications

General IconGeneral
ModelSMH75
Frequency50 Hz
PhaseSingle Phase
Outlet Size1 inch
MaterialStainless Steel
Power0.75 kW (1.0 hp)
Voltage220-240 V

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