Impeller pump Stratos MAXO series

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Overview
The Wilo Stratos MAXO is a smart wet‑rotor circulator pump designed for commercial HVAC and building automation systems. It combines EC motor technology and advanced control functions to optimise system efficiency and simplify commissioning and operation.

Key features

• Application‑guided setup with Setup Guide and Green Button Technology for intuitive commissioning.
• Optimised energy‑saving functions including No‑Flow Stop and Dynamic Adapt plus for reduced energy consumption.
• Multiple intelligent control modes: Dynamic Adapt plus, Multi‑Flow Adaptation, T‑const., ΔT‑const., Δp‑c, Δp‑v and Q‑const.
• Built‑in communication: Bluetooth and option slots for CIF modules (Modbus, BACnet, LON, CANopen, PLR) and Wilo Net for multi‑pump networking.
• Spacious terminal compartment and Wilo‑Connector for fast, ergonomic electrical installation.

Product properties

• Housing: grey cast iron with KTL coating.
• Impeller: PPS‑GF40; shaft 1.4028 with DLC coating; carbon bearing.
• Integrated EC motor with electronic performance adaptation.
• High‑resolution graphical colour display with guided menus and clear error messages.
• Standard thermal insulation shell for heating applications.

Display & operation

• Clear home screen and menus for selecting control mode and viewing measured values.
• Green button for quick access and confirmation; navigation keys and contextual help.
• On‑screen diagnostics, operating status, error history and suggested actions.

Applications
Suitable for non‑residential heating systems (radiators, underfloor, ceiling heating, buffer tanks, heat exchangers), cooling systems (ceiling/floor cooling, closed cooling circuits) and industrial thermal circuits. Certain combined heating/cooling functions require specific software versions or sensors.

Control modes

• Constant speed
• Δp‑c (constant differential pressure)
• Δp‑v (variable differential pressure)
• Dynamic Adapt plus
• T‑const. (constant temperature)
• ΔT‑const. (constant delta T)
• Q‑const. (constant flow)
• Multi‑Flow Adaptation
• User‑configurable PID

Optional functions

• Q‑Limitmax / Q‑Limitmin to restrict flow range.
• No‑Flow Stop (stop at zero flow).
• Automatic set‑back/reduced mode (depending on version/sensor).
• External sensor critical point control and variable Δp‑v slope.

Inputs / outputs & communication

• Analog inputs x2: 0–10 V, 2–10 V, 0–20 mA, 4–20 mA, PT1000 for remote setpoint or sensors.
• Digital inputs x2: potential‑free for Ext. OFF, Ext. MIN, Ext. MAX, MANUAL, keypad lock, heat/cool switch etc.
• Optional CIF modules for Modbus RTU/TCP, BACnet MS/TP/IP, LON, CANopen, PLR.
• Wilo Net for coordinated multi‑pump control; Bluetooth for smartphone/tablet connection.

Dual‑pump operation

• Configurable for two pumps (lead/standby or parallel operation) with automatic changeover and peak‑load optimisation.

Delivery content (examples)

• Stratos MAXO pump (selected version)
• Optimised Wilo‑Connector
• Cable glands and seals for threaded connections (depending on version)
• Flange washer sets for DN 32–DN 65 (if applicable)
• Thermal insulation shell

Variants (excerpt)
Stratos MAXO 25/0,5‑4 PN 10 | G 1½ | RP 1, DN 25 | EEI ≤ 0.18 | L0 180 mm | PN 10 | 1~230 V 50/60 Hz | 8.3 kg | Art. 2164567
Stratos MAXO 25/0,5‑4 PN 16 | G 1½ | RP 1, DN 25 | EEI ≤ 0.18 | L0 180 mm | PN 16 | 1~230 V 50/60 Hz | 8.3 kg | Art. 2186255
(Full variant table on technical datasheet)

Technical specifications

• Fluid temperature range: −10 °C to +110 °C (typical standard −10 °C to +90 °C).
• Supply: 1~230 V, 50/60 Hz.
• Protection class: IPX4D.
• Connections: Rp 1 / DN 25–100 or flanges PN 6/10/16 depending on model.
• Max operating pressure: standard PN 6/10 bar; options up to PN 16 bar.
• Qmax up to 74 m³/h; Hmax up to 16 m (model dependent).
• Materials: impeller PPS‑GF40, cast iron housing KTL, shaft 1.4028 DLC.