Carel pCO1 series Manual

Standard Shelter
Cod. +030221471 – Rel. 2.0 – April 01, 2003
9
5 OUTLET FAN
The outlet fan is always on when the unit is ON. It can be managed using an On–Off or modulating output. There are two alarms relating to the
fan, thermal cutout and air flow switch, which automatically switch the unit OFF; both the alarms require manual reset.
5.1.1 On-Off management
The outlet fan will start, after a set delay (default 10 sec), when the shelter unit starts. It will stay on until the unit is switched off. A stop delay
time for the fan after the unit has been switched off can also be set (default 20 sec).
In the event of a blackout, the outlet fan continues to operate, so as to ensure the recirculation of air inside the technological environment. In this
phase the freecooling function can also be modulated if the conditions are suitable.
5.1.2 Modulating management
NB.: All of the values in the following graphs refer to the default values
The minimum and maximum speed of the fan can be set. The default values 5.0V and 10.0V.
It should be noted that in dehumidification mode the speed is automatically reduced to the minimum value, 5.0V (50%); this value can be
modified if necessary.
In the event of a blackout the outlet fan continues to operate at 100% speed, so as to ensure the constant recirculation of air inside the
technological environment. In this phase the freecooling function can also be modulated if the conditions are suitable.
6 CONDENSER FANS
The condenser fans are controlled based on the condensing pressure and the status of the compressors. The fans are managed using 0-10V
modulating outputs. The control function uses the Condensing pressure set point and Differential, as shown below:
NB.: All of the values in the following graphs refer to the default values
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Prevent
differential
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t
t
t
Condensing set
Condensing
differential
14.0
16.0
18.0
20.0
HP differential
23.5
24.5
HP PREVENT
HP ALARM
Compressor
status
Condensino
pressure (bar)
Fan status
Ambient
tem
p
.
(
°C
)
COOLING
HEATING
0%
100%
100% 0%
Proportional band cool
Proportional band heat
Set temperature
19.5
100%
3°C
Minimum speed (5.0V)
Maximum speed (10.0V)
Fan speed
100%
50%
0.5°C 0.5°C 3°C
22.5 23.0
23.5 26.5

Carel pCO1 series Specifications

General

Brand	Carel
Model	pCO1 series
Category	Controller
Language	English