Carel pCO2 Manual

Standard Chiller/HP modulare per compressore a vite con driver CAREL
Cod.: +030221241 Rel. 1.0 dated 25 September 03
24
10.4 Control of water/water chiller unit with gas reversing heat pump
Inputs used:
• Water temperature at evaporator inlet
• Water temperature at evaporator outlet
• Water temperature at condenser inlet
• Water temperature at condenser outlet
Parameters used
:
• Type of unit
• Total number of compressors
• Type of compressor capacity control
• Number of capacity control steps
• Control set-point
• Control band
• Type of control (inlet - outlet)
• Type of control at inlet (proportional - proportional + integral)
• Integration time (if the proportional + integral control is enabled)
• Delayed starting of compressor capacity control stages
• Devices activation delay
• Refrigerating circuit reversing valve logic
Outputs used
• Liquid Solenoid
• Windings for compressor Line - Delta - Star
• All compressor capacity control relays
• Refrigerating circuit reversing valve
10.4.1 Description of operation :
Activation of compressors is controlled by the water temperature measured by the probe located at evaporator inlet/outlet. No condensation fans
are supplied because the condenser is water-cooled.
During the reversing of the refrigerator cycle, i.e. at changeover from refrigeration to heating and vice-versa, the evaporator and condenser
functions are exchanged.
In this mode, the refrigerating circuit is reversed, but the compressors are always controlled by the temperature at evaporator inlet/outlet.
10.5 Control of water/water chiller unit with water reversing heat pump
Inputs used:
• Water temperature at evaporator inlet
• Water temperature at evaporator outlet
• Water temperature at condenser inlet
• Water temperature at condenser outlet
Parameters used
:
• Type of unit
• Total number of compressors
• Type of compressor capacity control
• Number of capacity control steps
• Control set-point
• Control band
• Type of control (inlet - outlet)
• Type of control at inlet (proportional - proportional + integral)
• Integration time (if the proportional + integral control is enabled)
• Delayed starting of compressor capacity control stages
• Devices activation delay
• Water circuit reversing valve logic
Outputs used
• Liquid Solenoid
• Windings for compressor Line - Delta - Star
• All compressor capacity control relays
• Water circuit reversing valve
10.5.1 Description of operation :
Activation of compressors is controlled by the water temperature measured by the probe located at evaporator inlet/outlet. No condensation fans
are supplied because the condenser is water-cooled.
During the reversing of the refrigerator cycle, i.e. at changeover from refrigeration to heating and vice-versa, the evaporator and condenser
functions are not
exchanged.
In this mode, the water circuit is reversed, and the compressors are controlled by the temperature at evaporator or condenser inlet/outlet
according to the selected mode.

Carel pCO2 Specifications

General

Brand	Carel
Model	pCO2
Category	Controller
Language	English