AK-PC 781 Version 4.1x Menu operation RC8CE202 © Danfoss 03/2013 13
Thermostat/pressostats
Measurements AK error When “ON”, the controller is in alarm condition.
Comp. ctrl. temp °C Actual temperature for control sensor (Po or S4)
Comp. ctrl. ref. °C Actual reference temp. for compressor capacity
(incl. external reference signal, if any)
Compressor cap. % Cut-in compressor capacity in % (of total capacity)
Request Comp. Cap % Reference for compressor capacity (deviations may be due to time delays)
P0 °C Suction pressure in °C. (Measured with the pressure transmitter)
Ss Suction gas °C Actual suction gas temperature
Cond. ctrl. temp °C Actual temperature for control sensor (Pc or S7)
Cond. ctrl. ref. °C Actual reference temp. for condenser capacity
(incl. external contributions, if any)
Cond. cap. % Cut-in condenser capacity in % (of total capacity)
Request Cond. cap % Reference for condenser capacity
Pc Bar Condensing pressure (measured with the pressure transmitter)
Tc °C Condensing pressure in °C. (measured with the pressure transmitter)
Gc status Actual gas cooler operation:
0=O. 1=Standby. 2=Max COP operation. 3=Heat recovery. 4=Extra capacity.
5=Manual control.
Pgc Bar Actual gas cooler pressure
Pgc reference Bar Actual reference for gas cooler pressure
Sd discharge gas °C Actual discharge gas temperature
Sgc °C Actual temperature at outlet from the gas cooler
Thermostat 1 °C Temperature measurement of function dened in Thermostat 1.
Thermostat 2 °C Temperature measurement of function dened in Thermostat 2.
Thermostat 3 °C Temperature measurement of function dened in Thermostat 3.
Pressostat 1 Bar Pressure measurement of function dened in Pressostat 1
Pressostat 2 Bar As above but for Pressostat 2
Pressostat 3 Bar As above but for Pressostat 3
Settings Main switch Main switch: ON: Regulation
OFF: Controller stopped
T1 Cutin °C Cutin value for function dened in ”Thermostat 1”.
T1 Cutout °C Cutout value for function dened in ”Thermostat 1”.
T1 High Alarm °C High alarm limit "Thermostat 1"
T1 Low Alarm °C Low alarm limit "Thermostat 1"
T1 High Al delay m Time delay for high alarm "Thermostat 1"
T1 Low Al delay m Time delay for low alarm "Thermostat 1"
P1 Cutin press Bar Cutin value for function dened in ” Pressostat 1”.
P1 Cutout press Bar Cutout value for function dened in ”Pressostat 1”.
P1 High Al limit Bar High alarm limit "Pressostat 1"
P1 Low Al limit Bar Low alarm limit "Pressostat 1"
P1 High Al delay m Time delay for high alarm "Pressostat 1"
P1 Low Al delay m Time delay for low alarm "Pressostat 1"
(Use Service Tool if data concerning thermostats 2 to 5 or from Pressostat 2 to 5 have to be downloaded).
Voltage and PI inputs
Measurements AK error When “ON”, the controller is in alarm condition.
Comp. ctrl. temp °C Actual temperature for control sensor (Po or S4)
Comp. ctrl. ref. °C Actual reference temp. for compressor capacity
(incl. external reference signal, if any)
Compressor cap. % Cut-in compressor capacity in % (of total capacity)
Request Comp. Cap % Reference for compressor capacity (deviations may be due to time delays)
P0 °C Suction pressure in °C. (Measured with the pressure transmitter)
Ss Suction gas °C Actual suction gas temperature
Cond. ctrl. temp °C Actual temperature for control sensor (Pc or S7)
Cond. ctrl. ref. °C Actual reference temp. for condenser capacity
(incl. external contributions, if any)
Cond. cap. % Cut-in condenser capacity in % (of total capacity)
Request Cond. cap % Reference for condenser capacity
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