Carel pCO2 Manual

Standard Chiller/HP modulare per compressore a vite con driver CAREL
Cod.: +030221241 Rel. 1.0 dated 25 September 03
30
13 Starting a single compressor
13.1.1 Description of operation
The start-up stages are described in the following graph
Thermostat
Liquid solenoid
Ventilating unit
Compressor
Delayed power-up
13.2 Starting the compressor motor
13.2.1 Delta / Star starting
Starting the motor is described in the following diagram
Line
Contactor
Star
contactor
Triangle
contactor
Star-line delay
Star duration
Delta/Star delay
13.2.2 Start-up with Part - Winding
To start the compressor with part-winding, you must reset the star and delta-star times, setting the desired part-winding time as the delta-star time.
The outputs used are those of the line and triangle relays, used respectively as part-winding relays A and B.
Example:
Star-line time 0/100 s
Star Time 0/100 s
Delta-star time 100/100 s for a part-winding time of 1 s.
13.3 Compressor start restrictions
There are two start restricting methods. Both start the compressor directly with the triangle contactor, by-passing the star contactor. There is a
single enablement for both cases:
1. Set high and low pressure thresholds exceeded
2. Set equalised pressure threshold exceeded (equalised pressure is the average pressure between high and low pressure measured by the
transducers).

Carel pCO2 Specifications

General

Brand	Carel
Model	pCO2
Category	Controller
Language	English