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TH-0xxSx1
• COOLING/COOLING mode (
M01
=11)
The “
COOL
” icon is on to indicate cooling mode.
The regulation logic is as follows:
100
0
Temp.
PBC
(
I23
)
BCS
(
I08
)
DIFF
(
I20
)
PBC
(
I23
)
AO3
AO1
ECM speed 1
% opening valve
Fan
ECM speed 3
(
I31
)
0%
100%
AO2
Outputs
valves
If the operating temperature rises above
I08
the valve starts opening (output
AO1
). Icon turns on.
The valve can be regulated with PI action if the integral time
I24
is non-zero or with only proportional action if
I24
=0.
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
).
If the temperature rises above
I08
+
I20,
the second valve starts opening (output
AO3
) with proportional action.
The second valve opens completely if the temperature rises above
I08
+
I20
+
I23
.
Icon turns off when the valve (output
AO1
) 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
1
GN
D
AI3 GN
D
T1
T2
S1
S2
T3
CO
M
N
L
M1
0..
10
V
~
L
N
+
-
V1
AO1 GN
D
230Vac
AO2
G
G0
24Vac
GN
D
AO3
V2
Y G0
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)
