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TH-3xxSx1
• COOLING mode (
M01
=10)
The “
COOL
” icon is on to indicate that cooling mode is active.
The regulation logic is as follows:
Temp.
100
0
BCS
(
I08
)
PBC
(
I23
)
Output valve
speed 1
Fan
speed 3
speed 2
(
I25
)
0%
100%
(
I26
)
(
I27
)
% opening
valve
AO1
DO1
DO2
DO3
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 starts when the valve reaches the aperture defined in
I25
and after startup delay
I36
.
If the temperature continues increasing, the speed switches from speed 1 to speed 2 when the valve reaches the aper-
ture given in
I26
. The speed switches from speed 2 to speed 3 when the valve reaches the aperture given in
I27
.
Each speed is subject to a hysteresis of 20% of its activation point.
For example, for speed 3:
if
I27
=100%, speed 3 is activated when the valve reaches fully open and is deactivated when the valve closes by 20%
of
I27
, which is 80% of fully open in this case.
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
1
DO
2
GN
D
T1
T2
S1
S2
M1
I
II
III
DO
3
CO
M
N
L
230V
ac
V1
AO1 GN
D
G
G0
24V
ac
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)
