Carel pCO1 series Application Program

Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
31
12.0 OUTLET LIMIT
This function prevents too cold air from circulating in the environment, thus safeguarding health of any exposed person. A temperature probe
must be positioned on the air-conditioning unit outlet and parameters “Outlet set point” and “Outlet differential” shall be set. Such parameters
identify a limiting zone, as shown in the following diagram:
As shown in the diagram, if outlet temperature ranges between outlet set point and outlet differential, the cooling devices are limited only
partially; the more temperature decreases the more limitation increases.
As regards dehumidification limitation, the modulation zone is by-passed since dehumidification always needs the cooling devices maximum
capacity. In practice, the devices are switched off only if outlet temperature is lower than differential; the devices are then switched on again if
outlet temperature reaches the outlet set point, as shown in the following diagram:
Outlet temp.
(
°C
)
ON
OFF
Outlet differential
Outlet set
10.0 15.0
5.0°C
LIMITATION OFF
TOTAL
LIMITATION
OUTLET LIMITATION
Outlet temp.
(
°C
)
100%
0%
Outlet differential
Outlet set
10.0 15.0
5.0°C
LIMITATION OFF
TOTAL
LIMITATION
VARIABLE LIMITATION
1 COMPRESSOR
COMPRESSOR 1
COMPRESSOR 2 /
C1 it t l
COMP.1 C1 c. c. COMP.2 C2 c. c.
23.0 23.5 26.5
Temperature set
Ambient
tem
p
.
(
°C
)
23.0 23.5 25.0 26.5
23.0 23.5 24.2 25.0 25.7 26.5
0-10V COLD WATER VALVE
THREE-POINT COLD WATER VALVE
23.0 23.5 26.5
23.0 23.5 26.5
100%
100%
0%
0%
Ambient
tem
p
.
(
°C
)
Ambient
tem
p
.
(
°C
)
Ambient
tem
p
.
(
°C
)
Ambient
tem
p
.
(
°C
)

Carel pCO1 series Specifications

General

Brand	Carel
Model	pCO1 series
Category	Controller
Language	English