Stulz C7000 - Page 50

50 EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR a/C UNITS
Units with 1 refrigerant circuit
The adjusted parameters for "cpset 1" are valid.
Units with 2 refrigerant circuit, one speed controlled compressor and one on/off-compressor
For the circuit with speed controlled compressor the parameters adjusted by "cpset 1" are valid.
For the circuit with on/off-compressor the parameters adjusted by "cpset 2" are valid.
Units with 2 refrigerant circuit, 2 on/off-compressors only 1 G valve
The parameters adjusted by "cpset 1" are valid for both circuits.
The condensation pressure setpoint is calculated corresponding to the measured evaporation pressure
according to the cpset 1 parameters. The bigger one of both pressure values serves as a setpoint for the
opening of the G-valve.
The dynamic condensation pressure control has the following advantages in contrast to the control with fixed
condensation pressure setpoint:
- significantly reduced electrical power consumption at the same cooling capacity
- improved pressure control in most operating states by bigger G valve opening
The command cpset 1 or cpset 2 displays all related parameters:
The effective condensation pressure calculated as a function of the evaporation pressure is displayed by the
command "is1":
Condensation pressure 1 setp. mix.:27.0 bar
Condensation pressure 1 setp. DX..:27.0 bar
Condensation pressure 1 setp. dyn.:27.5 bar
Condensation pressure 1...........:13.9 bar
Hotgas temperature 1..............:23.0 °C
Evaporation pressure 1............:14.2 bar
Suction gas temperature 1.........:22.7 °C
Condensation pressure 2 setp. mix.:20.0 bar
Condensation pressure 2 setp. DX..:20.0 bar
Condensation pressure 2 setp. dyn.:21.0 bar
Condensation pressure 2...........:14.2 bar
..
.
ioc02:>cpset 1
Condensation pressure setpoints 1
Setpoint Mix..:12.0 bar
Setpoint DX...:18.0 bar
dynamic.......:0
ep1...........:10.1 bar
cp1...........:16.6 bar
ep2...........:14.1 bar
cp2...........:21.1 bar
ioc02:>kdsoll 2
Condensation pressure setpoints 2
Setpoint Mix..:12.0 bar
Setpoint DX...:18.0 bar
dynamic.......:0
ep1...........:10.0 bar
cp1...........:16.5 bar
ep2...........:14.0 bar
cp2...........:21.0 bar