1. A heating circulation pump with a pump housing (1) with a pump impeller (5) which is arranged therein and which is driven by an electrical motor arranged in a motor housing (8) connecting axially onto the pump housing (1), with a terminal box (12) connecting axially onto the motor...
Kind Code: A1 Abstract: The pump unit has an asynchronous AC motor (1,2) with a main coil and at least one auxiliary coil, wholly or partially switchable, in series with the main coil. There is a capacitance parallel to the main coil. The main coil has a negative temperature coefficient...