The Pentair Onga Intellimaster IMH Range of horizontal multistage centrifugal pumps, including models IMH750, IMH1100, and IMH2200, are designed for pumping clean water in various applications. These pumps are suitable for domestic water systems, small irrigation applications, and as pressure booster pumps. Their construction features a stainless steel pump casing, impeller, and diffuser, making them ideal for most potable water pumping applications.
Function Description:
The Onga IMH Series pumps are designed to move water efficiently and reliably. When integrated into an automatic pressure system, they can maintain consistent water pressure for various household and irrigation needs. The Intellimaster system, combined with a pressure vessel, assists the variable speed drive controller to optimize pump performance and longevity. The pump's operation involves drawing water through the suction inlet, boosting its pressure through multiple stages, and discharging it at a higher pressure and flow rate.
Important Technical Specifications:
- Models and Motor Power:
- IMH750: 750W
- IMH1100: 1100W
- IMH2200: 2200W
- Inlet (Suction):
- 1" BSPF (for IMH750 & IMH1100)
- 1¼" BSPF (for IMH2200)
- Outlet (Discharge):
- 1" BSPF (for IMH750 & IMH1100)
- 1¼" BSPF (for IMH2200)
- Water Temperature Range: 1°C - 50°C
- IP Rating: IP55 (protected against dust and low-pressure water jets from any direction)
- Electrical Supply: 230V +10%, -6%, 50Hz single phase
- Maximum Ambient Temperature: 40°C
- Pressure Vessel: Supplied with the pump to assist the variable speed drive controller. It needs to be pressurized to 70% of the pump's set pressure (e.g., if pump set point is 400kPa, vessel should be 280kPa).
Usage Features:
- Application Versatility: Suitable for domestic water supply, irrigation, and pressure boosting.
- Potable Water Compatibility: Stainless steel components ensure suitability for drinking water applications.
- Automatic Pressure System Integration: Can be used with an automatic pressure system, though consultation with an Onga dealer is recommended for suitability.
- Installation Guidelines:
- Pump Protection: Must be protected from weather, floods, chemicals, dust, vermin, and insects. A weather-proof, well-vented enclosure is highly recommended to prevent warranty voidance.
- Pipe Installation: Pipes should be supported to prevent strain on the pump casing. Flexible couplings (polythene pipe, rubber hose, or multi-directional barrel union) are recommended for connection and ease of service. Pipe fittings should be carefully screwed in, using Teflon tape for sealing, and hand-tightened to prevent leaks.
- Pump Location: Locate the pump as close to the water source as possible, on a separate footing (e.g., concrete tile or base) from the home.
- Power Source: Requires an outdoor 10A or 15A GPO electrical outlet (15A for IMH2200). The socket outlet should be dry and flood-free; extension cords are discouraged due to voltage drop and safety concerns.
- Suction System: This is a critical part of installation. A gate valve must be installed at tank outlets. Suction pipes should be kept as short as practical, made of re-enforced crush-resistant hose or pipe, and all fittings must be air-tight. The suction pipe diameter should be equal to or larger than the suction/inlet port. The suction pipe must be completely full of water for optimal performance.
- Discharge System: Length and diameter of discharge hoses/pipes affect pressure and flow rate. All components must exceed the pump's maximum pressure rating with an appropriate safety factor. Pipework should be supported independently.
- Priming:
- Ensure at least 200mm of water in the tank (outlet covered) and open the tank's gate valve.
- Remove the priming plug on top of the pump case.
- If the tank is above the pump, water will flow out; replace the plug.
- If the tank is below the pump or a check valve is in the suction line, fill the pump body and suction line using a funnel through the priming port.
- The pump may require multiple priming cycles during startup to expel all air.
- Operation:
- Always ensure the pump is filled with water before operating to prevent damage to seals and voiding warranty.
- The motor rotates clockwise when viewing the fan through the cowl.
- Safety Warnings:
- Electrical installation must comply with AS/NZS 3000 for Class 1, IP55 products.
- Users unfamiliar with pumping equipment should seek expert advice.
- Protect from freezing conditions; disconnect and drain water in cold weather.
- Always switch off and unplug the pump during installation or service.
- Use only with clean water; avoid abrasive, corrosive, or explosive fluids. Do not install in explosive environments.
- Incorrect installation can cause severe injury or property damage.
- Modern motors run hot; prevent debris accumulation. Allow 20 minutes to cool before handling. Automatic thermal overload will restart the motor without notice.
- Not for unsupervised use by young children or infirm persons.
- Supply voltage outside specified limits can damage the motor and void warranty.
- RCD Protection: It is strongly recommended that the pump be supplied from a socket outlet protected by a Residual Current Device (RCD) / Earth Leakage Circuit Breaker (ELCB) with a maximum rated residual current of 30mA for additional protection against electric shock.
Maintenance Features:
- General Care: Under normal conditions, the Onga IMH series requires minimal attention.
- Six-Monthly Check: A six-monthly check of the pump's general condition and plumbing is recommended.
- Performance Monitoring: Periodically check supplied pressure and power absorption. A decrease in pressure indicates wear, while increased current absorption signals abnormal mechanical function. If these symptoms occur, take the pump to a service agent.
- Pressure Vessel Maintenance: Air pressure in the pressure vessel can decrease over time. It is highly recommended to check the air pressure every 6 months and repressurize to 70% of the pump's set pressure using a hand or portable air pump. Failure to maintain pressure can cause the pump to run continuously or cycle on/off, leading to damage and voiding the warranty.
- Servicing:
- Only qualified personnel should service the pump, using genuine service parts.
- Always turn off power and remove the plug before servicing to prevent electrical shock.
- RCD tripping indicates an electrical problem; a qualified electrician should inspect and repair.
- If the power supply cord or appliance connectors need service, they must be replaced by a Pentair Water service agent or similarly qualified personnel.
- Liquid may be hot; release pressure with care before servicing.
The Onga IMH series pumps are backed by Pentair's commitment to continual product improvement, operational excellence (ISO 9001:2000 accredited), fair pricing, and a strong network of authorized dealers supported by the Onga Training Academy.
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