8.20 Circulation pump 8.20.1 General characteristics Jetsystem models are fitted with a synchronous circulation pump which continuously circulates the water from the filter body into the tub through the bellows seal. In certain models (those fitted with a heat exchanger, but not more recent models) the temperature control thermostats may be fitted to the circulation pump. 1. Water circulation outlet (delivery 8,5 - 12.5 l/min) 2. Secondary outlet (if featured) 3. Temperature control thermostats (certain models only) 8.20.2 Electrical symbol 8.20.3 Checking for efficiency NO RE-CIRCULATION - POOR WASHING RESULTS 1. Check that the impeller is not jammed and check for slippage. 2.
Check the resistance of the stator winding, which should be approximately 150/200 Ω . WATER IN THE BASE AND ON THE FLOOR Check the seals on the duct/thermostat holes Important! If caused to run empty (i.e. disconnected from the hydraulic circuit), synchronous pumps may fail to start up. This is because, due to their structural characteristics, they require a counter-torque on the impeller to allow the rotor to turn in one direction or the other. For this reason, the pumps should be tested only when fitted to the appliance and after introducing a certain quantity of water. SOI/DT 2002-05 eb 91 599 35 23-17