Daikin FTKB09AXVJU Service Manual

Daikin FTKB09AXVJU Service Manual Manual pdf 36 page image

Algorithm & Control282.22 Discharge Pipe Temperature ControlUsed as a measure of the compressor’s internal temperature.Compressor frequency is control to keep this temperature from going up further when it rises above a certainlevel.Discharge temperatureStop zoneDrop zoneFrequencykeep zoneReset zone110°C / 230°F102°C / 215.6°F99°C / 210.2°F90°C / 194°FIf compressor discharge temperature > 102°C (215.6°F) for the first time, this control starts and sets thecurrent frequency as upper limit. At the same time, running frequency starts to reduce by 1 step and so on,until temperature falls between 99°C (210.2°F) and 90°C (194°F) at the keep zone.This protection is activated when the compressor discharge temperature > 110°C (230°F). The compressorwill stop and considered trip.If the compressor discharge temperature < 90°C (194°F) , the compressor frequency will be reset based onthe outdoor ambient, set and room temperature.More detail information (i.e. “based on ambient” give the temperatures)2.23 Overall Current ControlTo monitor the overall current and to restrict the compressor upper limit rotation in order to prevent circuitbreakers from exceeding the rated capacity.Detected during compressor running.Current (A)L1L2L3Stop zoneReset zoneFrequencyreduce zoneFrequencyremain zoneModel L1RK(X)B09AXRK(X)N09AX 9.5ARK(X)B012AXRK(X)N012AX 10.0ARK(X)B18/24AXRK(X)N18/24AX 16.0AWhen the input current for running compressor exceeds L2, the running frequency will be reduced by 1 step.If the current still exceeds L2, frequency will be reduced by another step until total current falls between L2and L3.This protection cuts in when the input current exceeds L1 for 2 seconds. Compressor will stop and it isconsidered total current overload.If input current < L3, the compressor frequency is reset based on the outdoor ambient, set and roomtemperature.