24
HED-HCAT SE FREE COOLING
ENGLISH
REGULATION DIAGRAM
A
I
3
°
5
°
7
°
9
°
23
°
27
°
10
°
14
°
18
°
22
°
26
°
30
°
35
°
40
°
45
°
50
°
Minimum
temperature
alarm signal
and acknow-
ledgement
for connec-
tion of 2nd
air-conditio-
ner.
Regulation of
single air-con-
ditioner con-
nection by mi-
nimum
temperature.
ON-OFF re-
gulation for
connection
of 2nd air-
conditioner
for opera-
tion in Free-
Cooling
ON-OFF re-
gulation for
connection
of 2nd air-
conditioner
for opera-
tion in Coo-
ling.
High tempe-
rature signal
Maximum
operating
temperature
signal.
ON-OFF re-
gulation for
connection
of heating
element of
single air-
conditioner.
ON-OFF re-
gulation for
connection
of compres-
sor of single
air-conditio-
ner.
ON
OFF
Room temp.
Microprocessor card programming for the control of the single air-conditioner in the system:
1 Function of rotation of sequence of connection of the air-conditioners on the basis of the switching off of the last compressor, with prio-
rity of switching on for the other compressor, unless already operating, with daily reset of the frequency.
2 With Te<Ta (
∆
T>3°C): Free-Cooling mode
3 With Ta
≥
12°C e Ti>Ta (
∆
T
≥
2°C): alarm signal due to Free-Cooling air lock or electric heater anomaly.
