Connections - Danfoss ADAP-KOOL AK-PC 783 Design Manual

Limitation of speed during night operation
Heat recovery function
Trouble-shooting function FDD on condenser
Condenser pressure reference
Floating condensing pressure reference
Setting of references for heat recovery functions
Cascade regulation
Control sensor =Scasc2 and Scasc3 (app. SdLT)
Expansion valve = ETS or AKV. Parallel valve can be mounted
Safety functions
Min. suction pressure
Max. suction pressure
Max. condensing pressure
Max. discharge gas temperature
A bit more about the functions
Compressor
Regulation of up to 4 compressors each circuts and up to 3 unloaders
each compressor.
Compressor No. 1 or 2 can be speed-regulated.
The following can be used as control sensor:
1) P0 - Suction pressure
2) S4 - Cold brine temperature
(P0-LT is also used for 2, but for low-pressure safety.)
Condenser
Regulation of up to 8 condenser steps.
Fans can be speed-regulated. Either all on one signal or only the first
fan of several. EC motor can be used.
Relay outputs and solid state outputs may be used, as desired.
The following can be used as control sensor:
1) Pc - Condensing pressure
2) S7 - Warm brine temperature (Pc is used here for high-pressure
safety.)
Connection between high-pressure and low-pressure circuits (MT
and LT circuits)
All control between the MT and LT circuit must be performed inter-
nally in the controller.
Speed regulation of condenser fans
The function requires an analog output module.
A relay output may be used for start/stop of the speed regulation.
The fans may also be cut in and out by relay outputs.
Heat recovery
A thermostat function can be selected that will engage when desired
for heating.
Digital scroll
When using a digital scroll, the unloading of the compressor should
be connected to one of the four solid state outputs in the controller.
3

Connections

Here is a survey of the possible connections. The texts can be read in
context with the table on the following page.
Analog inputs
Temperature sensors
• S4 (Cold brine temperature)
Must be used when the control sensor for compressor control has been
selected as S4.
• Ss (suction gas temperature)
Must always be used in connection with compressor regulation.
• Sd (discharge gas temperature)
Must always be used in connection with compressor regulation.
AK-PC 783
x
x
x
x
x
x
x
x
x
x
x
Capacity controller RS8GN202 © Danfoss 11-2013
Min. / Max. superheat
Safety monitoring of compressors
Common high pressure monitoring of compressors
Safety monitoring of condenser fans
General alarm functions with time delay
Miscellaneous
Extra sensors
Inject On function
Option for connection of separate display
Separate thermostat functions
Separate pressostat functions
Separate voltage measurements
PI regulation
Max. input and output
Safety circuit
If signals are to be received from one or more parts of a safety circuit,
each signal must be connected to an ON/OFF input.
Day/night signal for raising the suction pressure
The clock function can be used, but an external ON/OFF signal may be
used instead.
If the "P0 optimization" function is used, no signal will be given con-
cerning the raising of the suction pressure. The P0 optimization will
see to this.
"Inject ON" override function
The function closes expansion valves on evaporator controls when all
compressors are prevented from starting.
The function can take place via the data communication, or it may be
wired via a relay output.
Separate thermostat and pressure control functions
A number of thermostats can be used according to your wishes. The
function requires a sensor signal and a relay output. In the controller
there are settings for cutin and cutout values. An associated alarm
function may also be used.
Separate voltage measurements
A number of voltage measurements can be used according to your
wishes. The signal can for example be 0-10 V. The function requires a
voltage signal and a relay output. In the controller there are settings
for cutin and cutout values. An associated alarm function may also be
used.
Separate PI regulations
A series of PI regulations can be set up as desired.
If you want to know more about the functions, go to chapter 5.
• Sc3 (outdoor temperature)
To be used when monitoring function FDD is used.
To be used when regulation is performed with floating condenser refer-
ence.
• S7 (warm brine return temperature)
Must be used when the control sensor for condenser has been selected
as S7.
• Saux (1-4), any extra temperature sensors
Up to four additional sensors for monitoring and data collection may be
connected. These sensors can be used for general thermostat functions.
• Scasc2, Scasc3
Control sensors for cascade
(The SdLT signal can be used instead of the Scasc3 signal, but only if
nothing else is mounted in the pressure pipe).
• Shrec
Temperature sensor for heat recovery
x
x
x
x
10
7
x
2
3
3
3
3
120
35