The heat pump is not tested at +12°C. Full load operation at +12°C is extrapolated from test data at +7°C and +2°C. 50% part load is extrapolated from 50% part load operation at +7°C and +2°C. COP for the required effect is extrapolated by using this data. Each extrapolated COP value is corrected with a degradation factor of 0.975.
Default values are used for the degradation factor (Cd=0.1), turndown ratio heating (=25%), thermostat off mode (50W), crankcase heater mode (=10W) and off mode (=10W). The bin limit is set to -20°C
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