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Pump down
Load shed limit
Emergency cap. day
Emergency cap. night Emergency capacity in the event of a malfunction of the regulation sensor (suction pressure
Comp. start delay
Injection OFF delay
Configuration
Control sensor
Compressor mode
No. of compressors
Lead comp. size
Comp. size
VSD Min. speed
VSD Start speed
VSD Max speed
PWM period time
CRII Period time
10
Pump-down function
To avoid too many compressor starts/stops at a low load, it is possible to define a pump-
down function for the last compressor. In this case, the compressor will be cut out when the
current suction pressure is down at the set "Pump-down limit Po".
(The setting must be greater than the safety limit for low suction pressure "PoA Min Limit".)
Capacity limitation at "low shed signal"
Set how much compressor capacity can be cut in when a signal is received from either a DI
input or a system device via data communication.
Emergency capacity in the event of a malfunction of the regulation sensor (suction pressure
sensor)
Set the desired capacity that will apply during daytime operation.
(If the S4 media temperature sensor becomes damaged/defective, use Po for regulation.)
sensor)
Set the desired capacity that will apply during night operation.
(If the S4 media temperature sensor becomes damaged/defective, use Po for regulation.)
Delay of compressor start after forced closing of expansion valves (at the end of a forced
close signal)
The delay will result in the system device receiving a start signal for all the evaporator con-
trols involved before the first compressor is started.
Delay of the forced closing of expansion valves, if the controller calls for cut in of compres-
sors, but the compressors are in a locked situation and therefore cannot start.
Configuration
Select the regulating sensor for the suction circuit:
• Pressure transmitter Po
• Media temperature sensor S4 (brine regulation). (Po is used for safety)
Set the type of compressor to be used for regulation:
• Multi all:****
All compressors have unloaders
)
• Multi + Single:****
First compressor has unloaders. The remaining ones are one-step units
)
• Speed+Multi: ***
First compressor is speed-controlled. The remaining ones are with unload-
)
ers.
• Speed+Single: ***
First compressor is speed-controlled. The remaining ones are
)
one-step units
• CRII4+Multi **
)
First compressor is CRII4 compressor. The remaining ones are with unloaders
• CRII4+Single **
First compressor is CRII4 compressor. The remaining ones are
)
one-step units
• Stream 4+Multi: **
First compressor is a stream compressor. The remaining ones are with
)
unloaders
• Stream 4+Single: **
First compressor is a stream compressor. The remaining ones are
)
one-step units
• Digital scroll: *
First compressor is a digital scroll. The remaining ones are one-step units
)
• Single-step only: All are one-step compressors
• None:
Set the number of compressors on the suction circuit
This is a total amount.
(If both suction groups are selected, the max. number will be 4 for A and 4 for B.)
Set the nominal compressor capacity for the first compressor (it is defined under
"Compressor mode")
That is, the capacity of either a "Digital scroll", "Stream", "Variable speed CRII" or
"First compressor with unloaders"
Set the nominal compressor capacity of the other compressors
For single-step only: All are of the same size, including the first.
For unloader all: All are of the same size, including the first.
***: For speed
Min. speed at which the compressor will cut out
***: For speed
Minimum speed at which the compressor will start (must be set to a higher value than
"VSD Min. speed")
***: For speed
Highest permitted speed for compressor
*, **: For "Scroll" and "Stream"
Set the period time for the unloader valve (on time + off time)
**: For CRII
Set the period time for the unloader valve (on time + off time)
User Guide RS8GY302 © Danfoss 2015-06
Yes /No
Fac: No
Min: -80°C (-1.0 bar)
Max: 30°C (50.0 bar)
Facb: -40°C (0.3 bar)
Min: 0 %
Max: 100%
Fac: 100%
Min: 0 %
Max: 100%
Fac: 50%
Min: 0 %
Max: 100%
Fac: 25%
Min: 0 s
Max: 180 s
Fac: 30 s
Min: 0 s
Max: 300 s
Fac: 120 s
AI-demand
Po / S4
Fac: Po
DO-demand /
AO-demand
Fac:
Single step only
DO-demand
Min: 1
Max: 8
Fac: 0
Min: 1 kW
Max: 100 kW
Fac: 1 kW
Min: 1 kW
Max: 100 kW
Fac: 1 kW
Min: 10 Hz
Max: 60 Hz
Fac: 30 Hz
Min: 20 Hz
Max: 60 Hz
Fac: 45 Hz
Min: 40 Hz
Max: 120 Hz
Fac: 60 Hz
Min: 10 s
Max: 20 s
Fac: 20 s
Min: 10 s
Max: 20 s
Fac: 60 s
AK-PC 551
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