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If the operating temperature rises above
I09
+ (
I21
: 2) the cooling valve starts to open (output
AO1
). Icon turns on.
The fan (output
AO2
) starts when the valve reaches the minimum aperture given by parameter
I31
, and after the fan
start delay
I36
has expired.
The speed increases linearly as the valve opens. Speed 3 is reached when the valve is fully open (see
“EC motor auto-
matic speed control logic with 0..10 V modulating outputs” page 28
).
Icon
turns off when the valve closes again, in which case the fan stops if
I28
=0 or 3. The fan maintains speed 1 if
I28
=1 or 2. The fan maintains speed selected manually if
I28
=4 or 5.
Wiring diagram
N L
DI
1
GN
D
DI
2
AI1 GN
D
AI2
DO
2
GN
D
AI3 GN
D
T1
T2
S1
S2
T3
CO
M
N
L
M1
0..
10
V
~
L
N
+
-
V1
DO
1
R1
AO1 GN
D
230Vac
AO2
G
G0
24Vac
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)