6.2 Nominal temperature graph
Because of the various appliance constructions and evaporator arrangements, every
refrigerator has its own standard behavior pattern. To make it possible to check the
temperatures in an appliance at a later date, for every refrigerating appliance there are
standard curve specification sheets available (ASP - Diagram setpoint curve).
The temperature range at each setting is exactly specified on these standard curve
sheets. The sheets also indicate how regulators behave at various ambient temperat-
ures. It is possible to read off the relative time the appliance is switched on and energy
consumption relative to the selected regulator setting.
With the nominal temperature graph, the measured temperature values (actual values)
of an appliance can be compared with the nominal values, and troubleshooting meas-
ures can be initiated in case of temperature discrepancies.
Fig.17: Nominal temperature graph example
The nominal graph consists of the following test values:
¡ EAN (kWh / d): medium energy consumption per day
¡ Controller positions: Segments of the tolerance ranges
– Minimum controller position: right segment
– Medium controller position: medium segment
– Maximum controller position: left segment
¡ RED (%): relative compressor power-on time
¡ TM (°C): medium temperature inside refrigerator
¡ TV (°C): medium freezer compartment temperature
¡ TFKF (°C): medium temperature in the 0 °C compartment
¡ TKEF (°C): medium temperature in the cold storage drawer
¡ TR 16: 16 °C ambient temperature
¡ TR 25: 25 °C ambient temperature
¡ TR 32: 32 °C ambient temperature
Measuring technology
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