TECHNICAL MANUAL
CVM 3000
C 5030 CV/04-99 GB
34
7.3 Free-cooling regulation (only FC version):
The regulation is made using the
T15
key.
Key
T13
allows you to visualise the set point variation compared to the value set with the
T2
key (the set point variation is enabled through parameter 97).
Key
T14
allows you to visualise the actual thermal head between the unit’s inlet and
outlet temperatures.
These visualisations appear on the
C2
display.
7.3.1 Default set point settings
NB: refer to the figure above.
N.
MACHINE PARAMETERS
RANGE
DEFAULT
81
PROPORTIONAL BAND FOR FAN REGULATION IN FREE COOLING
OPERATING MODE
0
↔
500
2 °C
85
PRIMARY CIRCUIT INTEGRAL TIME
0
↔
600
0 sec
87
SECONDARY CIRCUIT INTEGRAL TIME
0
↔
600
0 sec
98
MINIMUM DIFFERENCE BETWEEN INLET WATER TEMPERATURE
AND EXTERNAL AIR TEMPERATURE FOR THE STARTING OF FREE
COOLING OPERATION
0
↔
50
1 °C
99
MAXIMUM DIFFERENCE BETWEEN EXTERNAL AIR TEMPERATURE
AND INLET WATER TEMPERATURE FOR THE END OF FREE
COOLING OPERATION
0
↔
50
1 °C
138
FAN ACTIVATION HYSTERESIS IN FREE-COOLING MODE
-10
↔
10
1 °C
139
FAN ACTIVATION OFFSET IN FREE-COOLING MODE
-10
↔
10
2 °C
140
FAN SHUTDOWN DELAY IN FREE-COOLING MODE
0
↔
500
20 sec
141
FAN STARTUP DELAY IN FREE-COOLING MODE
0
↔
500
20 sec
SET CHILLER
Parameter 138
Parameter 81
Parameter 139
Example of free-cooling regulation with 6 fans
