Condensing unit controller
6.12 Controller settings
NOTE! In case of controller replacement beware that unit controller settings are different from default controller factory settings!
Function Code Min.value Max.value
Default
controller
settings
Unit controller
settings
Normal operation
Set point Tc (regulation reference follows the number of degrees
above the outside temperature Tamb)
--- 2.0 K 20.0 K 8.0 K
Regulation
Select SI or US display. 0=SI (bar and °C). 1=US (Psig and °F) r05 0/ °C 1/F 0/ °C
Internal Main Switch. Manual and service = - 1, Stop regulation = 0,
Start regulation =1
r12 -1 1 0 1
Offset during night operation. During night operation the
reference is raised by this value
r13 0 K 10 K 2 K
Set point for suction pressure Ts r23 -25 °C 10°C -7°C
Readout of reference for Tc r29 - - -
Min. condensing temperature (lowest permitted Tc reference) r82 0°C 40°C 10°C
Max. condensing temperature (highest permitted Tc reference) r83 0°C 50°C 40°C
Max. discharge gas temperature Td r84 50°C 160°C 135°C 125°C
Alarms
Alarm time delay on signal on the DI2 input A28 0 min. 240 min. 30 min.
Alarm for insufficient cooling in condenser. Set temperature
difference.
A70 3.0 K 20.0 K 10.0 K
Delay time for A70 alarm A71 5 min. 240 min. 30 min.
Compressor
Min. ON-time c01 5 s 240 s 5 s
Min. OFF-time c02 3 s 240 s 30 s
Min. time between compressor starts c07 0 min. 30 min. 5 min.
Pump down limit at which the compressor is stopped (setting 0.0
= function dis-activated)
C33 0.0 bar 15.0 bar 0.0 bar 2.3
Min. compressor speed c46 30 rps 70 rps 30 rps
Start speed for compressor and min. speed for high condensing
temperatures
c47 30 rps 70 rps 50 rps
Max. compressor speed c48 50 rps 100 rps 100 rps
Max. compressor speed during night operation (% value of c48) c69 50% 100% 70%
Definition of compressor control:
0=no external start/stop;
1=switch on DI1 must start/stop;
2=inverter compressor speed control
c71 0 2 1 2
Time delay for high Td. The compressor will stop when time
expires
c72 0 min. 20 min. 3 min.
Max. pressure. Compressor stops if a higher pressure is recorded c73 7.0 bar 50.0 bar 23.0 bar 25.8
Difference for max. pressure (c73) c74 1.0 bar 10.0 bar 3.0 bar
Min. suction pressure Ps. Compressor stops if a lower pressure is
recorded
c75 -0.3 bar 10.0 bar 3.0 bar 2
Difference for min. suction pressure and pump down c76 0.1 bar 5.0 bar 0.7 bar
Amplification factor Kp for compressors PI regulation c82 3.0 30.0 20.0
Integration time Tn for compressors PI regulation c83 30 s 360 s 60 s
Liquid Injection Offset c88 0.1 K 20.0 K 5.0 K
Liquid Injection hysteresis c89 10.0 K 30.0 K 15.0 K
Compressor stop delay after Liquid injection c90 0 s 10 s 3 s
Desired compressor speed if the signal from the pressure
transmitter Ps fails
c93 30 rps 70 rps 60 rps
Min On time during Low Ambient LP c94 0 0 120
Measured Tc for which the Comp min speed is raised to StartSpeed c95 40.0 10.0 70.0
Control parameters
Amplification factor Kp for PI regulation n04 1.0 20.0 7.0
Integration time Tn for PI regulation n05 20 120 40
Kp max for PI regulation when the measurement is far from
reference
n95 5.0 50.0 20.0
33FRCC.PC.044.A6.02
Application Guidelines
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