Circulator pump Termojet AUTO energy-saving APM-F 40/12-250 mm

Circulating pump Termojet AUTO APM-F 40/12-250 mm — a flanged energy-saving pump with ECM permanent-magnet motor for heating and cooling systems. Flange connection DN40, installation length 250 mm, power consumption 25–670 W, maximum head 12 m, flow rate up to 24 m³/h, fluid temperature 0°C to +110°C, protection class IP44.

Technical Specifications

AUTO Operating Modes

Constant differential pressure (Δp-c). The pump maintains a set pressure difference between supply and return regardless of the current load. Δp-c mode is optimal for boiler rooms with a variable number of active circuits: even when most zones are closed, the pressure in the main line remains stable.

Proportional differential pressure (Δp-v). The differential pressure decreases proportionally to the flow rate. During night or weekend operating modes the pump automatically reduces speed — lower consumption, lower noise. Δp-v mode is recommended for systems with zonal climate control.

Applications

• Boiler room of a private house or small commercial facility with DN40 pipework.
• Heating systems for medium-sized offices or retail premises.
• Cooling systems: fan-coil units or precision cooling with DN40 distribution.
• Solar thermal and process heating systems up to +110°C.
• Termojet Mega series — catalogue: full range of flanged pumps.
• Termojet pump groups — catalogue.
• Heat-pump systems: Termojet heat pumps.

Why an ECM Motor Pays Off

The ECM motor of the APM-F 40/12 smoothly adjusts speed according to the current system load: minimum 25 W in base mode, maximum 670 W at peak flow. An unregulated pump of the same rating would consume peak power continuously. The electrophoretic body coating protects against corrosion; the EPDM seal is maintenance-free for the entire service life. The built-in water-cooled motor keeps noise below 50 dB and delivers a long service life without maintenance.

APM-F 40/12 and Heat-Pump Systems

For medium-capacity heat pumps with DN40 pipework, the APM-F 40/12 delivers the required flow rate and adapts to the variable HP load in Δp-v mode. See heat-pump solutions at tjheatpump.com.ua.

Frequently Asked Questions

What is the difference between APM-F 40/12 and APM-F 40/15?
The APM-F 40/12 has a maximum head of 12 m — for systems with moderate hydraulic resistance. The APM-F 40/15 is designed for 15 m — for systems with longer mains or a greater number of control elements. The flow rate (24 m³/h) and flange (DN40) are identical.

Is the APM-F 40/12 suitable for replacing an unregulated DN40 pump?
Yes, provided the installation length (250 mm) and flange standard match. After replacement the ECM motor will automatically reduce consumption under partial load. Also see the Termojet Mega series.