Jenn-Air JDB9600AW, Technical Education

Page: 33 / 193

BBDUDBHQBE±3DJHRI
1 Pressure connection 5 Guide wheel
2 Heating tube with NTCs 6 Intake connection
3 BLDC motor 7
Pump housing with intake and
pressure connections
4 Pump wheel
3.17.3 Function of the circulation pump
The water is drawn in via the intake connection. The guide wheel
guides the water evenly along the heating tube. The water is pumped
to the water points via the pressure connection.
While water is being circulated, the BLDC motor (Brushless DC Motor)
signals different states to the power electronics via the current
consumption of the individual windings:
►
No water,
►
too little water, snorkels
►
adequate water level, (true running)
►
pump blockage.
Safety-relevant states, such as “Heating without water” or “Water
temperature too high”, are detected and evaluated for the heating
operation.
If the pump is blocked, this is detected by the electronics. By several
approach attempts
, the pump try to loosen the blockage.
If this is not successful, the running programme ends. A corres-
ponding error code is saved in the error memory.