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2.4 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:
TOTAL
LIMITATION
Temperature set
As shown in the diagram, if outlet temperature ranges between outlet set point and outle t 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:
TOTAL
LIMITATION
INNOV@-pCO1-IOM-0907-E
100%
VARIABLE LIMITATION
10.0
Outlet differential
1 COMPRESSOR
23.0
23.5
COMPRESSOR 1
23.0
23.5
COMP.1
C.1 c.c.
23.0
23.5
24.2
0-10V COLD WATER VALVE
0%
23.0
23.5
THREE-POINT COLD WATER VALVE
0%
23.0
23.5
ON
OUTLET LIMITATION
10.0
Outlet differential
0%
5.0°C
COMPRESSOR 2/
C1 can control
25.0
COMP.2
C.1 c.c.
25.0
25.7
OFF
5.0°C
Outlet set
15.0
26.5
26.5
26.5
100%
26.5
100%
26.5
Outlet set
LIMITATION OFF
15.0
Ambient
temp. (°C)
Ambient
temp. (°C)
Ambient
temp. (°C)
Ambient
temp. (°C)
Ambient
temp. (°C)
Ambient
temp. (°C)
Outlet
temp. (°C)
11
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