Carel pCO1 series Application Program

Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
27
10.0 HUMIDITY CONTROL
The humidification and dehumidification devices are managed based on the humidity value measured by the ambient (or room temperature)
probe. The measured humidity is compared to the set humidity (set point); the devices are enabled based on the difference between the two
values. The proportional band identifies the air-conditioning unit working range and can take different values in humidification and
dehumidification mode. The 0.2% fixed dead zone identifies the devices non-action zone round the set point.
Humidification is available for medium boards only. On the contrary, dehumidification is always available and enables the available cooling
devices and a contact for an external dehumidifier or for reducing the outlet fan speed.
In case of medium boards, humidification can be executed as follows:
• built-in humidifier
• 0-10Volt modulating output
• On-Off contact
Dehumidification can be executed as follows:
• On-Off contact for an external dehumidifier or for reducing the outlet fan speed
• compressors enabling (active capacity controls included, if any)
• 100% enabling of the 0-10Volt or three-position modulating cooling valve
The dehumidification On-Off free contact is always managed, whereas the cooling devices depend on unit configuration and User selection. The
0-10Volt modulating output of the dehumidification outlet fan is automatically reduced by 50% (modifiable); with On-Off fan, use the digital
contact for reducing speed.
The following diagrams show the humidification and dehumidification devices action. The percentage values indicate the modulating valves
opening range.
10.1 CLOSE CONTROL UNITS WITH DIRECT EXPANSION COIL
Ambient
humidit
y
(
%
)
DEHUMIDIFICATION
HUMIDIFICATION
100%
100%
0%
Dehumidification proportional band
Humidification proportional band
Humidity set
1 COMPRESSOR
+ Capacity control, if any
48.0 50.0 52.0
COMP.1 +
c. c.
,
if an
y
51,0
COMP.2 +
ON-OFF CONTACT
0-10Volt MODULAT. OUTPUT
2.0% 2.0%
INTEGRATED HUMIDIFIER
100%
0%
100%
30%
48.0 50.0 52.0
48.0 50.0 52.0
48.0 49.8 50.0
Ambient
humidit
y
(
%
)
Ambient
humidit
y
(
%
)
Ambient
humidit
y
(
%
)

Carel pCO1 series Specifications

General

Brand	Carel
Model	pCO1 series
Category	Controller
Language	English