Wilo Yonos MAXO 40/0.5-4 PN 6/10 circulating pump for central heating and HVAC systems
- Wilo Yonos MAXO 40/0.5-4 circulating pump for central heating and HVAC systems with electronic differential pressure control, DN40 connection, 230 V power supply, operating pressure up to 10 bar and IPX4D protection.
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Wilo-Yonos MAXO 40/0.5-4 PN 6/10
The Wilo-Yonos MAXO 40/0.5-4 PN 6/10 is a high-performance electronic circulating pump for heating, air-conditioning and closed refrigeration systems, designed for operation with heating water and water-glycol mixtures. The device is characterized by simple operation through the green button function, high energy efficiency and compact design for easy installation and service.
- Electronic capacity control with Δp-c, Δp-v and constant speed modes (3 gears).
- Temperature range of the pumped medium from -20°C to +110°C, with the possibility of using water-glycol mixtures.
- Maximum operating pressure up to 10 bar (PN 6/10) and maximum head up to 4 m.
- Spinning rotor motor, resistant to blocking currents, with overload protection and automatic unlocking.
- Clear LED display showing current power consumption in watts and lift height in meters.
- Compact design with DN 40 connection ferrules for easy integration into existing installations.
Applications and control functions
The Wilo-Yonos MAXO 40/0.5-4 PN 6/10 pump is designed for water heating circuits according to DIN/EN, air-conditioning systems and closed cooling circuits in residential and commercial buildings. It can pump heating water according to VDI 2035, cooling water and water-glycol mixtures, whereby a suitable operating point must be selected for high glycol percentages. Electronic control allows the pump to be selected according to the characteristics of the system: Δp-c (constant differential pressure) mode for volume-controlled systems, Δp-v (variable differential pressure) mode for systems with thermostatic radiator valves, and constant speed mode (n = const) with three levels for systems with stable operating conditions.
The pump has protective functions, including automatic unlocking of the impeller after standstill, built-in motor overload protection and a venting function. With a tidy control panel with a single knob, the user can set the required head and control mode, while LEDs indicate current settings and possible error conditions. The design is suitable for installation in horizontal and vertical pipelines, according to the flow direction marked on the pump body.
Construction and materials
Wilo-Yonos MAXO 40/0.5-4 PN 6/10 is a wet rotor pump in which the motor and hydraulics are a compact unit mounted between the pipeline connection flanges. The pump body is made of gray cast iron, suitable for use in heating and cooling systems, while the impeller is designed from wear-resistant plastic, ensuring quiet operation and high efficiency. The shaft is made of corrosion-resistant material (e.g. stainless steel/ceramic, depending on the design), supported by plain bearings lubricated by the pumped medium.
Sealing between the wet part and the motor stator is realized by a separating sleeve made of thin-walled, corrosion-resistant material, which ensures hermetic separation of the stator winding from the medium. The stator is equipped with electrical insulation of ciepLn class to match the conditions of expLoatation in heating systems. The entire outer casing and junction box are designed to allow easy access to the terminal block and to provide a degree of protection against external agents suitable for installation in technical rooms.
| Parameter | Wilo-Yonos MAXO 40/0.5-4 PN 6/10 |
|---|---|
| Medium | Heating water according to VDI 2035, water-glycol mixtures, cooling water |
| Temperature range of the medium | from -20°C to +110°C (depending on pressure characteristics and proportion of glycol) |
| Type of pump | Circulation pump with wet rotor, electronically regulated |
| Control modes | Δp-c (constant differential pressure), Δp-v (variable differential pressure), constant speed operation (3 speeds) |
| Maximum head | up to 4 m |
| Capacity range | up to approx. 4-5 m³/h (depending on operating point and settings) |
| Nominal diameter of connections | DN 40 |
| Connection | Flanged, PN 6/10 |
| Maximum operating pressure | 10 bar (PN 6/10) |
| Motor type | Spinning rotor motor, directly coupled to the hydraulics, resistant to blocking currents |
| Motor protection | Built-in overload protection, automatic unblocking of the rotor |
| Protection functions | Automatic venting, blockage protection, fault indication |
| Power supply | 1~230 V, 50 Hz (standard design) |
| Input power range | low energy consumption due to electronic control (exact values according to data sheet) |
| Degree of protection | IP according to design (typically IPX4D / IP44 for indoor installation applications) |
| Energy efficiency class | High-efficiency circulating pump that meets ErP requirements for electronic pumps |
| Display | LED: current power consumption (W), head (m), error states |
| Operating elements | One button/knob (green button) for operating mode selection and head setting |
| Installation orientation | In horizontal or vertical pipeline; shaft axis should be horizontal |
| Bearing lubrication medium | Pumped medium (water / water-glycol mixture) |
| Pump casing material | Gray cast iron |
| Impeller material | Corrosion-resistant plastic |
| Shaft material | Corrosion resistant material (e.g. stainless steel/ceramic - depending on catalog design) |
| Sealing between wet part and stator | Separation sleeve made of non-corrosive material |
| Ambient temperature | Typically 0°C to +40°C (in accordance with the permissible ambient temperature for circulation pumps in technical rooms) |
| Minimum suction pressure | Adapted to the temperature of the medium; ensure no cavitation according to the NPSH chart in the documentation |
| Noise level | Low noise emissions typical of wet rotor pumps (specific values according to data sheet) |
| Electrical mounting | Cable connection to terminal strip in junction box; overcurrent protection on supply side required |
| Compliance with standards | Compliance with ErP requirements for circulating pumps, electrical and pressure safety standards for installation equipment |
| Installation type | Heating, air-conditioning, closed refrigeration systems in residential and commercial buildings |
| Application restrictions | Do not use for chemically aggressive, solids-containing or highly contaminated media; selection for high glycol content requires consideration of viscosity and density variations |
Wilo-Yonos MAXO 40/0.5-4 PN 6/10 is a modern circulating pump that, thanks to its electronic control and high efficiency, helps reduce energy consumption in heating and cooling systems. Thoughtful design and intuitive operation make it a reliable and convenient solution for daily expLoatation in both residential and commercial buildings.
FAQ (customer)
- Q: For what type of heating systems is the Wilo-Yonos MAXO 40/0,5-4 PN 6/10 suitable?
A: It is suitable for closed hot water heating systems, air-conditioning and cooling circuits in residential and commercial buildings, using heating water according to VDI 2035 or water-glycol mixtures. - Q: Can this pump work with glycol-based antifreeze mixtures?
A: Yes, the pump can handle water-glycol mixtures; however, at higher glycol concentrations you must consider the changed viscosity and density when selecting the operating point. - Q: Is it possible to repLace an old uncontrolled circulator with this model without major pipe modifications?
A: In many cases yes, because it has standard DN 40 flanged connections (PN 6/10) and compact dimensions; check the installation length and flange standard versus your existing pump. - Q: How is the pump operated and adjusted?
A: Operation is via a single “green button” or rotary knob and an LED dispLay; you can select the control mode and set the required head, while the dispLay shows power consumption and operating status. - Q: Does the pump need additional motor protection devices?
A: The pump has integrated motor protection against overload and blocking currents, but an overcurrent circuit breaker is still required in the mains suppLy according to local electrical regulations. - Q: How noisy is the pump during operation?
A: As a wet-rotor high-efficiency circulator it operates very quietly; typical sound levels are low enough for use in domestic boiler rooms and technical rooms.
FAQ (expert)
- Q: Which control modes are impLemented and how should they be selected?
A: The pump provides Δp-c (constant differential pressure), Δp-v (variable differential pressure) and constant speed (3 fixed speeds). Use Δp-v for radiator circuits with thermostatic valves, Δp-c for volume-controlled systems and constant speed for hydraulically balanced systems with stable conditions. - Q: What is the maximum permissible operating pressure and temperature range?
A: The pump is designed for systems up to 10 bar (PN 6/10) and can handle media temperatures from -20°C to +110°C, subject to adherence to the pressure–temperature envelope in the documentation. - Q: Are there limitations regarding water quality and contamination?
A: Yes, the pump is designed for clean heating water according to VDI 2035 or similar quality; it must not be used with aggressive, abrasive or heavily contaminated media that could damage the hydraulic components and bearings. - Q: How is air removal and anti-blocking handled?
A: The pump includes an automatic venting function using its control algorithm and integrated electronics, as well as an automatic deblocking function that protects against rotor seizure after standstill. - Q: What should be considered when using high glycol concentrations?
A: With rising glycol content, viscosity and density increase, reducing pump output; you must refer to the correction diagrams in the technical documentation and possibly select a higher operating point or different pump size. - Q: How should the pump be installed with respect to motor orientation?
A: The pump must be installed so that the motor shaft is horizontal, independent of pipe direction; this guarantees proper bearing lubrication and minimal noise.
Reviews
- The pump delivers noticeably lower power consumption compared to our previous standard circulator and has reduced our heating energy bill.
- Installation was straightforward thanks to the DN 40 flanges and the compact design; we reused the existing pipework without major changes.
- The green-button control is intuitive, and the LED dispLay gives clear feedback about power usage and head settings.
- In a mixed heating and cooling appLication the pump has been running reliably for several seasons without any failures.
- Service technicians appreciate the integrated motor protection and the automatic deblocking function, which reduces service calls after summer shutdowns.
- The noise level is very low; in a residential building the pump is practically inaudible in normal operation.
- Balancing radiator circuits with thermostatic valves became easier using the variable differential pressure mode.
- The pump’s ability to work with glycol mixtures is a big advantage in our chilled-water system with frost protection.
- From an energy-efficiency standpoint, this model meets current ErP requirements and is a sensible repLacement for outdated, uncontrolled pumps.
- Overall build quality and materials feel robust, making it suitable for continuous duty in commercial heating pLants.
- Electricians found the wiring straightforward, with easy access to the terminal box and clear marking of connections.
- After one year of operation, the pump has proven stable with no leaks, alarms or unpLanned downtime in our installation.