Carel pCO1 series Manual

Standard Shelter
Cod. +030221471 – Rel. 2.0 – April 01, 2003
10
Representation of the modulating output:
The maximum and minimum speed of the condenser fans can be set; if the minimum speed set is greater than 0V, the fan will be able to operate
at the minimum speed down to 1.0 bar below the condensing pressure set point before stopping altogether (see the dashed part in the graph
above).
6.1 NUMBER OF PROBES AND CONDENSING COILS
Note: the activation of the fans always depends on the status of the compressors, as well as the values read by the probes.
1 Coil 2 Coils
1 Compressor 2 compressors 1 Compressor 2 compressors
1 Fan 2 Fans 1 Fan 2 Fans 1 Fan 2 Fans 1 Fan 2 Fans
0 probes The fans work together when any of the compressors starts
Each fan starts together with the corresponding
compressor
1 Probe
The probe directly
controls the fan. If the
probe is faulty the fan
will be activated
together with the
compressor
The probe controls
both fans. If the probe
is faulty the fans will be
activated together with
the compressor
The probe directly
controls the fan. If the
probe is faulty the fan
will be activated
together with the
compressors
The probe controls
both fans. If the probe
is faulty the fans will be
activated together with
the compressors
Not possible Not possible Not possible Not possible
2 Probes
Not possible Not possible
The fan works based
on the greater of the 2
pressure values. If both
probes are faulty the
fan will be activated
together with the
compressors. If only
one probe is faulty the
fan works based on the
value of the other
probe.
The fans work based
on the greater of the 2
pressure values. If both
probes are faulty the
fans will be activated
together with the
compressors. If only
one probe is faulty the
fans work based on the
value of the other
probe
Not possible Not possible Not possible
The fans work
based on the
pressure of the
corresponding
circuit. If one of
the probes is
faulty, the fan will
be activated
when of the
compressor in the
same circuit
starts.
If no condenser probe is enabled, the fans will start when the corresponding compressor starts, if there are 2 coils. With just one coil, on the
other hand, the fans will always work together when either of the 2 compressors starts. In this case, they will start at 100% speed.
6.2 PREVENT FUNCTION
This prevents the high pressure alarm when the compressors are off. Normally the condenser fans only start when the compressors are on, but in
this case they are forced on so as to lower the pressure and attempt to prevent the high pressure alarm, which would stop the unit. There is no
modulation in this phase, and the fans are started immediately at 100% speed.
6.3 SPEED-UP FUNCTION
To overcome the inertia when starting high-power modulating fans, they can be forced on for a few seconds at maximum speed, after which the
speed is modulated based on the condensing pressure.
6.4 PRESSURE – TEMPERATURE CONVERSION
Either pressure probes or temperature probes can be used. When using pressure probes, the screens in the I/O branch show the temperature
corresponding to the pressure value for each probe, keeping account of the type of refrigerant used, selected by a parameter in the manufacturer
branch.
Max. speed (100%)
Min. speed (0%)
Condensing
p
ressure
(
bar
)
Condensing differential
13.0
2.0 bar
0% 14.0
16.0

Carel pCO1 series Specifications

General

Brand	Carel
Model	pCO1 series
Category	Controller
Language	English