Carel pCO2 Manual

Standard Chiller/HP modulare per compressore a vite con driver CAREL
Cod.: +030221241 Rel. 1.0 dated 25 September 03
32
15 Solenoid-valve management.
Inputs used:
• Compressor delivery temperature
Parameters Used
:
• Solenoid-valve activation threshold
• Solenoid-valve differential
Outputs used :
• Economizer solenoid-valve, oil-cooler, liquid-injection
15.1.1 Description of operation
A digital output is provided for controlling an economizer solenoid-valve, oil-cooler and liquid injection. Activation is based on the delivery
temperature values of the compressor read by the probe according to the following graph
Solenoid-valve
activation threshold
Differential
Compressor delivery
temperature
Differential
Delivery Alarm
threshold
16 Pump-down
Inputs used
• Low Pressure Pressure-switch
Parameters used
• Enable pump - down
• Pump - down maximum duration
Outputs used
• Liquid Solenoid
• Windings for compressor Line - Delta - Star
• All compressor capacity control relays
16.1.1 Description of operation
If enabled, pump-down occurs by the thermostat disabling the compressor.
Pump-down duration can be set and can cease due to maximum time or due to the tripping of the high pressure pressure switch.
If any alarm powers down the machine or even just the compressor, the pump-down finishes immediately.
When the pump-down function operates, this forces the compressor to forced capacity control.
For compressors with stepped capacity control, operation at minimum/maximum power is forced.
For compressors with modulating capacity control, continuous discharging/charging of the compressor is forced.

Carel pCO2 Specifications

General

Brand	Carel
Model	pCO2
Category	Controller
Language	English