Carel srl: pCO Stage Controller
page 17
1
on
compressor 1 on
1 compressor
2
on
capacity control 1compressor 1 on
1 comp 1 capacity control
3
on
capacity control 2 compressor 1 on
1 comp 2 capacity controls
4
on
compressor 2 on
2 compr 2 capacity controls
5
on
capacity control 1 compressor 2
2 compr 3 capacity controls
6
on
capacity control 2 compressor 2
2 compressors + 4 capacity controls
7
on
compressor 3 on
3 compressors + 4 capacity controls
8
off
capacity control 2 compressor 1 off
3 compressors + 3 capacity controls
9
off
capacity control 1 compressor 1 off
3 compressors + 2 capacity controls
10
off
capacity control 2 compressor 2 off
3 compr 1 capacity controls
11
off
capacity control 1 compressor 2 off
3 compressors
12
off
compressor 1 off
2 compressors
13
on
capacity control 1 compressor 3 on
2 compr 1 capacity control
P62 - cold/warm
With this parameter it will be possible to decide whether these devices belonging to the circuit 1 are used to obtain
cold (P62=0; e.g. compressors) or warm (P62=1; e.g. boilers).
AL13 - not working EEPROM
In case of an EEPROM failure (chip within the device) this signal is activated. Skilled technicians are needed.
AL14, AL15, AL34 - not working probe
The relevant probe is broken or is not connected. Check the wiring and functioning of the probe.
If AL14 is present the devices programmed with the P5 parameter are forced to switch on, and the inverter of the
device no.1/valve, if enabled, is forced to 10 volts. The remaining devices can be switched on according to the value
measured by the probe 1. If AL15 is present all the devices connected to the circuit 2 are forced to switch on and the fan
inverter is forced to 10 volts.
If AL34 is present, the compensation (if enabled) does not work. These alarms can be operated only manually, and
so they do not reset until the user does not press the alarm button the pCO terminal in order to clear the alarms.
AL16 - high pressure switch/antifreeze
AL16 given the high pressure alarm if the pCO controls a Refrigerator Plant (see pp. 32-33) or it gives the antifreeze
alarm if the pCO controls a Chiller (see pp. 34-35).
AL17 - low pressure switch/flow controller
AL17 gives the low pressure alarm, if the pCO controls a Refrigerator Plant (see pp. 32-33) or it gives the flow
controller alarm if the pCO controls a Chiller (see pp. 34-35).
AL33 - incorrect selected device number
If the sum of the device number of the primary and secondary circuit and of the voltage controls exceeds the number
of outputs really available, the ALL33 alarm is produced.
PSt, PSC, PSS, Psn - password
These four codes refer to the Password of the Maintenance, Clock, Setpoint and Programming branches
respectively.
For each of the listed branches, the number to be set in order to have access to the successive parameters is:
pressure or
temperature
set
differential
n
2 1
pressure or
temperature
set
differential
1 2
•
proportional band
•
cold
•
proportional band
•
warm
request switch off
devices
pressure or
temperature
set
differential
request switch on
devices
request switch on
devices
pressure or
temperature
set
differential
request switch off
devices
•
neutral zone
•
cold
•
neutral zone
•
warm