Flamco - Pro PU 231 Digital Pressurisation Unit - Dual Pump - 1-3 Bar - 230V

Designed for high-volume sealed systems, the FLAMCO 21603 Pro PU 231/1-3 is a floor-standing digital pressurisation unit using an electronic pressure transducer and microprocessor control to keep system pressure stable and safe.

Delivering top-up flow rates up to 18 L/min via an 18 Ltrs internal break tank, it suits commercial, industrial and large domestic applications. Available in single or twin-pump configurations for sealed LPHW/CHW systems (guide volume up to 300,000 Ltrs).

• Pressure setting in 0.1 Bar increments (max 3 Bar)
• MODBUS RTU communications; password-protected access; bi-directional menu
• Service reminder after 12 months; system fill mode
• Dry-run, anti-seize routine and flood-protection functions

Finished in grey (RAL 7016) and powered from 230V 50Hz 1ph, the Pro PU logs events and offers extensive volt-free contacts for BMS integration.

Real-world product applications

• Boosting water pressure to multiple outlets in a building
• Maintaining stable pressure where demand varies
• Supplying water from storage tanks to distribution pipework
• Supporting general water supply and transfer systems
• Assisting with pressure control in utility installations

Key Product Features

• Applications: commercial, industrial and residential sealed systems (guide ≤ 300,000 Ltrs)
• Hydraulics:18 Ltrs break tank; up to 18 L/min top-up
• Control: pressure set in 0.1 Bar steps; 3 Bar maximum; bi-directional programming; system fill mode
• Protection: dry-run; anti-seize (2-second pulse if inactive 60 days, enable at commissioning); flood protection (pump runtime limiter, excessive start alarm)
• Comms:MODBUS RTU; password-protected access
• Electrical: electric pump 230V 50Hz 1ph
• Service: on-screen service reminder (12 months)
• Event logging: alarm activations; pump run counter (per pump); cumulative run timer (hours/pump); electrical interruption
• Volt-free contacts (standard): Common Alarm (N/C), High Pressure (N/O), Low Pressure (N/O), Sensor Health (N/O), Pump 1 Health (N/O), Pump 2 Health (N/O)
• Optional VFCs (factory expansion board): Low Pressure Warning (N/O), High Pressure Warning (N/O), Low Water in Break Tank (N/O), Low Additive in Holding Tank (N/O), Pump 1 Run for Top-up (N/O), Pump 2 Run for Top-up (N/O)
• Finish: grey powder coat (RAL 7016); floor-standing enclosure
• Operating pressure: 3 Bar.

Flamco (est. 1956) is a Dutch manufacturer of HVAC and plumbing system components, including expansion vessels, air separators and pressurisation accessories. Their ranges are used in heating and chilled-water circuits and potable water systems across domestic and commercial installations.