User Guide
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Capacity Controller, AK-PC 651
© Danfoss | ADAP-KOOL® | 2015.10
24 | RS8HA102 |
Injection off
The electronic expansion valves in the cooling appliances must be closed when all the compressors are prevented from starting.
As a result, the evaporators will not be filled with fluid that can be led to a compressor when the regulation process restarts.
One of the compressor control relays can be used for this function, or the function can be prompted via data communication.
Sd monitoring
When regulating with Sd monitoring, one of the three compressor types will increase capacity if the temperature nears the Sd limit. This
will result in better cooling of the unloaded compressor.
Copeland Stream compressor
The PWM signal can also be used to control one stream compressor with one unloader valve (Stream 4) or one with two unloaders
(Stream 6).
Stream 4: The compressor capacity is distributed by up to 50% for one relay and the remaining 50-100% for the unloader. The unloader is
connected to DO5 or DO6.
Stream 6: The compressor capacity is distributed by up to 33% for one relay and the remaining 33-100% for the unloader. The unloaders
are connected to DO5 and DO6.
.
Bitzer CRII Ecoline
CRII 4: The pulse signal can also be used to control one CRII with two unloaders (4-cylinder version).
The compressor capacity can be controlled from 10 to 100%, depending on the pulsation of the unloaders. The compressor start
signal is connected to a relay output, and the unloaders are connected to DO5 and DO6.
Unloader 2 follows unloader 1,
but it remains displaced by a
half period.
Unloader 1
Unloader 2
CRII 6: The pulse signal can also be used to control one CRII with three unloaders (6-cylinder version).
The compressor signal is connected to one relay output.
The two unloaders are connected to DO5 and DO6. The third is connected to a relay output.
The compressor capacity can be controlled from 10 to 67%, depending on the pulse of the unloaders.
The relay is then connected to the third unloader. When this relay is on, the capacity will be controlled between 33 and 100%.