• Used in subcritical and transcritical cooling control systems
• Maintains optimal pressure in the gas cooler
The controller can be used in systems with trans-critical and subcritical cooling control systems where CO2 is used as a refrigerant. The controller regulates the pressure in the gas cooler (condenser) so that the system achieves the optimal COP.
Maintains optimal pressure in the trans-critical range.
Guarantees an optimal operating situation in the subcritical range, so that the best possible COP is achieved.
On/off input to start/stop regulation. Regulation stops and the valve opens when the input is closed. The function can be wired so that the valve opens when the compressor has stopped.
Facility to force the valve to open at pressures over Pgc Max. lim.
Facility to use either dP or dT to control sub-cooling in a subcritical state. (dT is used as a basic principle.)
4-20 mA output signal to control the valve.
Facility to connect a pressure transmitter so that the pressure in the receiver can be read off. This function requires an external power supply.
The controller guarantees the system’s maximum performance by maintaining the optimal pressure in the gas cooler when regulation takes place in the trans-critical range.
The controller will always optimise to a subcritical state.