Carel pCO2 Series Manual

Standard Shelter
Cod. +030221471 – Rel. 2.0 – April 01, 2003
7
3.2 OTHER TEMPERATURE FUNCTIONS
The high and low temperature alarms generate a signal with an alarm screen, and have a modifiable delay.
NB.: All of the values in the following graphs refer to the default values
The stop dehumidification differential defines the minimum temperature below which the dehumidification function is stopped; the function can
start again if the temperature rises back over the set Start dehumidification offset; the differential and offset can both be modified.
3.3 HUMIDITY CONTROL
The humidification and dehumidification devices are managed based on the humidity values measured by the probe in the room (or at the
intake). This humidity is compared against the humidity set point, and the devices are activated according to the difference. The proportional
band identifies the operating field of the shelter, and can have different values in humidification and dehumidification mode. There is a fixed
dead zone of 0.2% around the set point equal that identifies a zone in which the devices are not activated.
Humidification is only available on medium boards; dehumidification is on the other hand also available for small boards (not available on the
pCOxs, as the humidity probe cannot be installed) and works by activating the compressor/compressors enabled for this function, and by
operating the outlet fan at a certain speed. This speed can be modified, and as default is equal to 50% (5.0V).
Humidification, on medium boards, is managed using a digital output (open/closed).
Dehumidification, on small and medium boards, is managed by controlling the compressor/compressors.
Dehumidification is interrupted if the ambient temperature falls below a certain value. The corresponding differential and offset can be set. In
any case, dehumidification is always possible if: Ambient temperature > Temperature set point – Temperature dead zone.
The 0-10Volt modulating output for the outlet fan in dehumidification mode is automatically reduced by 50% (modifiable);
If the outlet fan is managed by a digital output (open/closed), in dehumidification the outlet fan speed will remain unvaried.
The following diagrams illustrate the behaviour of the humidification and dehumidification devices.
NB.: All of the values in the following graphs refer to the default values
Set tem
p
erature
Ambient
humidit
y
(
%
)
Ambient
humidit
y
(
%
)
Set humidity
0%
Proportional band dehumidification
Proportional band humidification
40.0%
10.0%
10.0%
50.0%
60.0%
On
Off
On
Off
40.0%
50.0%
60.0%
ON-OFF SWITCH
1/2 COMPRESSORS
HUMIDIFICATION
DEHUMIDIFICATION
Ambient
Tem
p
erat.
(
ºC
)
17.5ºC
Dead Z.
Dehumid. Temperature differential limit
Dehumid. Temperature offset limit
5.0
º
C
4.0ºC
On
Off
21.5ºC
DEHUMIDIFICATION ENABLE
On
Off
Ambient
tem
p
erature °C
COOL
Set tem
p
erature 23.0°C
Heat band
Low temperature alarm
3
°
C
10°C
HEAT
13.0 19.5
23.5
26.5
33.0
3°C
High temperature alarm
10°C
Cool band
22.5

Carel pCO2 Series Specifications

General

Brand	Carel
Model	pCO2 Series
Category	Controller
Language	English