Manual pCoOEM Bicircuit - Rhoss

6 COMPRESSORS
6.1 Refrigerating circuit types
The software can manage the following types of unit, all with the chance of working in chiller mode
or heat pump:
single-circuit – single-compressor
single-circuit – twin-compressor
twin-circuit – twin-compressor
twin-circuit – four-compressor
Tandem compressors configuration
Tandem compressors configuration
The compressors will be of hermetic type, without any chance of power modulation by choking
steps.
6.2 Safety delay times
For each compressor will be managed some safety delay times with the purpose to protect the
working of the device restricting the working to particular conditions given from the manufacturer of
the same compressor.
The managed times will be:
1. switch-off minimum time
2. minimum time among following switch-on of the same compressor
3. minimum time of working
4. time among switch-on of different compressors
5. time among switch-off of different compressors
6.2.1 Switch-off minimum time
Between a switch-off and a switch-on of the same compressor a safety time must be respected.
That time will be applied even at the return from blackout deactivating the thermostatic control,
protecting the compressor from switch-off of not exact last.
6.2.2 Time between starting times of the same compressor
From a switch-on to the next must be respected a safety time with the purpose of guarantee the
minimum number of starting times per hour of the compressor.
Working minimum time
After the switch-on a compressor must work for a minimum time same at the indicated time
independently from the thermostatic request.
The switch-off can be immediate after an alarm, delayed for a decrease of request with active time.
6.2.3 Time among switch-on of different compressors / Time among
switch-off off different compressors
In twin/four-compressor units are applied two different safety times between the switch-on and
switch-off of following compressors.
The applied time among the switches-on avoids the electric circuit overloud caused by the
possible contemporary switch-on of two devices (for example after an alarm).
The applied time among the switches-off makes gradual the power decrease in the circuit,
avoiding then swinging of the requests between switch-on and switch-off.
Rhoss S.p.A. S.A.T.
Rev. 1.0 20/01/05 22