Circulator pump Termojet AUTO energy-saving APM-F 50/12-280 mm

Circulating pump Termojet AUTO APM-F 50/12-280 mm — a flanged energy-saving pump with an ECM permanent-magnet motor for heating and cooling systems of medium and large facilities. Flanged connection DN50, installation length 280 mm, power consumption 25–550 W, maximum head 12 m, flow rate up to 25 m³/h, fluid temperature 0°C to +110°C, protection degree IP44.

Technical Specifications

AUTO Operating Modes

Constant differential pressure (Δp-c). The pump maintains a fixed pressure difference between the supply and return lines regardless of the number of active consumers. The Δp-c mode is the choice for systems requiring stable hydraulics under variable load: a boiler room with multiple circuits, a chiller–fan coil system.

Proportional differential pressure (Δp-v). The differential pressure decreases proportionally with the reduction in flow rate. When part of the system circuits is shut off, the pump automatically reduces its speed — significant savings at partial load. The Δp-v mode is recommended for systems with zone control.

Applications

• Commercial boiler room for office or industrial premises: main heating pump with DN50 flanged connection.
• Medium-scale cooling systems (chiller–fan coil, precision cooling).
• Domestic hot water systems for large buildings.
• Solar thermal and process heating systems.
• Termojet Mega series — catalogue: full range of flanged pumps.
• Termojet pump groups — catalogue.
• Commercial-grade heat pump systems: Termojet heat pumps.

Why the ECM Motor is More Economical

DN50 flanged pumps with an uncontrolled motor run at a single fixed speed and consume constant power regardless of actual load. The APM-F 50/12 with an ECM motor smoothly adjusts its speed: minimum consumption of 25 W in base mode, peak 550 W only at maximum flow. The electrophoretic coating of the casing protects against corrosion, EPDM seals require no replacement, and the operating noise level is up to 50 dB. Water cooling of the motor guarantees a long service life without external maintenance.

APM-F 50/12 and Heat Pump Systems

Large heat pumps for commercial buildings require pumps with a flow rate of 15–25 m³/h on the primary circuit. The APM-F 50/12 fully meets these requirements and in Δp-v mode adapts to the variable output of the heat pump. View solutions for commercial facilities at tjheatpump.com.ua.

Frequently Asked Questions

What is the difference between APM-F 50/8 and APM-F 50/12?
The APM-F 50/12 has a higher maximum head (12 m vs. 8 m) and higher maximum power (550 W). Both models have a DN50 flange and are recommended for different hydraulic configurations depending on system resistance.

Can the APM-F 50/12 replace an uncontrolled DN50 pump?
Yes, provided the installation dimensions and flange standard match. After replacement, the ECM motor will automatically reduce consumption at partial load — the payback from the replacement is noticeable already in the first season.