Honeywell L4189A2006U aquastat

Aquastat (thermostat) Honeywell L4189A2006U Immersion thermostat 25–95°C with single-pole SPST switch for precise control of pumps and valves in heating systems. The Honeywell L4189A2006U Aquastat is a high-sensitivity immersion thermostat designed for regulating water temperature in hydraulic heating systems. The device is equipped with a liquid-filled sensor installed in a remote bulb, providing fast and accurate response to changes in coolant temperature. This model is designed for panel mounting and controlling single-phase circulation pumps, valves, and contactors using a single-pole switch (SPST). If your boiler does not maintain the required temperature, the circulation pump runs constantly or shuts off with a delay, the cause is often a faulty original aquastat. Technical specifications: Parameter Value; Part numbers L4189A2006U, 534.109.017; Manufacturer Honeywell / Resideo; Mounting type Panel-mount with remote bulb; Sensor type Liquid-filled, immersion; Working medium Water; Temperature adjustment range 25–95°C; Switching differential 4°C (fixed); Switch type SPST (single-pole single-throw, Normally Open); Capillary tube length 1000 mm (1 meter); Electrical load (resistive) 10 A at 250 V AC; Electrical load (inductive) 2.5 A at 250 V AC; Electrical load (locked rotor) 15 A at 250 V AC; Ambient temperature range 0 to 70°C; Storage temperature range -40 to 70°C; Adjustment means External knob; Additional functions 2 contacts (according to manufacturer marking). Key advantages: High-precision liquid temperature measurement: The aquastat is equipped with a liquid-filled sensor that provides fast thermal response and high sensitivity.