RESISTANCE RETURN SENSOR

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Remove air intake pipe
Remove the connector from the return sensor (blue)

Measurement:

Measure the resistance between the terminal of the return sensor and the flow pipe.
The resistance varies with temperature and should conform approximately to the table below:
Is the resistance measured as expected?

vl ecomax 824 thr flow & return in situ.gif

Note: Clicking on the resistance table will switch between table and graph view.

Temperature Range (°C)	Resistance Range
0°C to 10°C	9.2kΩ - 5.5kΩ
10°C to 20°C	5.5kΩ - 3.4kΩ
20°C to 30°C	3.4kΩ - 2.2kΩ
30°C to 40°C	2.2kΩ - 1.4kΩ
40°C to 50°C	1.4kΩ - 960.0kΩ
50°C to 60°C	960.0kΩ - 660.0kΩ
60°C to 70°C	660.0kΩ - 460.0kΩ
70°C to 80°C	460.0kΩ - 330.0kΩ
80°C to 90°C	330.0kΩ - 240.0kΩ
90°C to 100°C	240.0kΩ - 180.0kΩ