Design Of A Compressor And Condenser Control; Procedure; Sketch; Compressor And Condenser Functions - Danfoss AK-PC 772A User Manual

Design of a compressor and condenser control

Procedure:

1. Make a sketch of the system in question
2. Check that the controller's functions cover the required
application
3. Consider the connections to be made
4. Use the planning table. / Note down the number of connections
./ add up
5. Are there enough connections on the controller module? – If
not, can they be obtained by changing an ON/OFF input signal
from voltage signal to contact signal, or will an extension
module be required?
6. Decide which extension modules are to be used
7. Check that the limitations are observed
8. Calculate the total length of modules
9. The modules are linked together
10. The connection sites are established
11. Draw a connection diagram or a key diagram
12. Size of supply voltage/transformer
1

Sketch

Make a sketch of the system in question.
2

Compressor and condenser functions

Application
Regulation of a compressor group MT
Regulation of a condenser group LT
Regulation of a parallel compression IT
Regulation of a gas cooler
Regulation of CO 2 receiver pressure
Regulation of compressor capacity
Regulation sensor = P0
PI-regulation
Max. number of compressor steps on MT + IT
Max. number of compressor steps on LT
Max. number of unloaders each compressor
Identical compressor capacities
Different compressor capacities
Speed regulation of 1 or 2 compressors
Run time equalisation
Min. restart time
Min. On-time
Liquid injection in suction line
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AK-PC
772A
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Capacity controller RS8HF102 © Danfoss 2017-07
Follow these 12
steps
External start/stop of compressors
Oil management
Oil equalisation
Suction pressure reference
Override via P0 optimization
Override via "night setback"
Override via "0 -10 V signal"
Regulation of gas cooler
Regulation sensor = Sgc
Step regulation
Max. number of steps
Speed regulation
Step and speed regulation
Speed regulation first step
Limitation of speed during night operation
Heat recovery function for domestic water or room
Gas cooler pressure reference
Floating pressure reference
Setting of references for heat recovery functions
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AK-PC 772A