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• 0 = the regulator immediately sets the output proportional to the speed specified by parameter Fn23 and
maintains this speed for the time specified by parameter Fn13.
• 1 = the regulator actuates the proportional output according to a ramp that allows the speed specified by
parameter Fn23 to be reached in the time specified by parameter Fn13.
If Fn13= 0, pick-up is disabled. The regulation may be at central set or side set depending on parameter St01.
The use of the interstep times Fn16 and Fn17 is enabled and they are loaded during the instrument switching on and
switching off phases. To prevent uncertainty, it is recommended to set the values to 0.
Regulation
The operating mode depends on parameter ST02. Cold mode St02 = 1. Hot mode St02 = 0.
If no condensation probe has been allocated (temperature or pressure), the fan ON/OFF switch will be controlled on
request from the compressor in cooling mode or in heating mode if Fn10 = 1, otherwise if Fn10 = 0 the fan is always
ON.
When the fan is ON it is piloted at the speed set by parameter Fn24. If however a condensation probe has been
allocated, the fan control is proportional as a function of the condensation probe value. The fan may be regulated
independently from the compressor or at the request of the compressor depending on parameter Fn10 (operation on
request by compressor): If Fn10=0 then condensation is controlled independently from the compressor, however if
Fn10=1 then the fan is OFF when all of the compressors available are OFF.
The minimum cut-off is bypassed for the time specified by parameter Fn14 on start-up of the compressor. If the
regulator requests the cut-off during this period the fan is piloted at the minimum speed set by parameter Fn20.
Note: The cut-off does NOT force the fans to be switched on but only prevents them from being switched off. The
following diagrams illustrates the fan speed and the digital inverter enabling output as a function of the regulation
probe in the case of regulation with lateral set point (St01=1). In the case of central set point (St01=0), the
proportional band is deemed to be centred in the set point:
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