Danfoss AK-CH 650 - Page 9

AK-CH 650 Version 2.0x Service Guide RC8BV402 © Danfoss 2016-02 9
Air ow status 0: No RFG. select No refrigerant has been selected (monitoring of air
ow can not start)
1: Tuning Monitoring function adapts to the condenser in question
2: OFF Monitoring function is switched OFF
3: OK Air ow is OK
4: Little dirt The amount of dirt decreases the performance of the condenser,
clean when possible
5: Dirty The amount of dirt leads to considerable air ow problems, clean
as soon as possible
6: Blocking The amount of dirt might lead to high pressure problems, clean
now
Sc3 Air on °C Outdoor temperature in °C measured with Sc3 temperature sensor
VSD Speed % Status of analogue output signal “AO” for variable speed drive (in percent of
full scale f.ex. 0 -10 V d.c.)
VSD safety Status of safety monitoring input for Variable Speed Drive
ON: Alarm on VSD A safety monitoring input
OFF: No alarm on VSD A safety monitoring input
Heat rec. temp. °C Temperature at the sensor for the heat recovery function
Heat recovery Status on function "Heat recovery"
No. of fans Dened number of fans
Settings Main switch Main switch: ON: Regulation
OFF: Controller stopped
Cap. control mode 0: MAN (The condenser capacity will be controlled manually)
1: OFF (The capacity control will be stopped)
2: AUTO (The capacity is controlled by the PI controller)
Manual capacity % Manual setting of condenser capacity
The value is in % of total capacity controlled by the controller
Reference mode 0: Set point Reference = “PcA setpoint °C”
1: Floating Reference is changed as a function of the outdoor temperature
measured by the “Sc3 air on” sensor, the set “Dimensioning tm K”
and the actual compressor load.
Setpoint °C Setting of required discharge pressure in °C
Dimensioning tm K Dimensioning mean temperature dierential between air- and condensing
temperature at full load for the condenser in question (Typical 8 – 15K).
Min. tm k tm value at minimum load.
Min. Reference °C Min. permissible condensing pressure reference
Max. Reference °C Max. permissible condensing pressure reference
Heat rec. SP °C Condensing pressure reference when the thermostat for heat recovery is cut in.
Heat rec. Cut In °C Temperature value when the thermostat changes over to heat recovery.
Heat rec. CutOut °C Temperature value when the thermostat cuts out the heat recovery again
Xp P-band K Proportional band for PI controller
Tn Integr. time s Integration time for PI controller
Control type Selection of regulation type:
0: P regulation
1: PI regulation
VSD Min. speed % Minimum allowed speed before stop of Variable Speed drive (Low load condition)
VSD Start speed % Minimum speed for start of Variable speed drive (Must be set higher than
“VSD Min. Speed %”)
Cap. limit night % Capacity limitation during night operation