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2.18.3 Setpoint graph as a diagnosis aid
There is a special setpoint graph for almost every appliance. This
setpoint graph has been attached to the circuit diagrams and can be
found under “Graph”.
The setpoint graph can be used to compare the measured
temperature values (actual values) of an appliance with the setpoint
values.
The relative compressor ON duration and the mean energy absorption
per day can also be determined.
Example of diagnosis aid
►
A fridge-freezer with mechanical control
►
Ambient temperature = 25 °C
►
Controller position = 1
►
Measured refrigerator compartment temperature = 9 °C
►
Measured freezer compartment temperature = –17 °C
Refrigerator compartment temperature tolerance band / Relative
ON duration
The setpoint temperature of the refrigerator compartment is between
7 °C and 10 °C
The refrigerator compartment temperature is correct in this example.
The temperature is 9 °C in the tolerance band (7 °C – 10 °C).
The relative compressor ON duration is 12 % – 37 %.
