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The electric resistance is always off in this application.
- Operation with half season function (
M15
=1):
The “
COOL
” icon is on to indicate that cooling mode is active.
The regulation logic is as follows:
100
0
Temp.
PBC
(
I23
)
Outputs
HH
(
I18
)
DZ
(
I21
)
ECM speed 1
% opening
valve
Fan
ECM speed 3
(
I31
)
0%
100%
AO2
FB
(
I27
< 100%)
AO2
Temp.
BCS
(
I08
)
AO1
DO1
I27 = 100%
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 automatic 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.
If the operating temperature drops below
I08
-
I21
-
I18
, relay
DO1
(electric resistance) is activated and the fan starts
immediately at speed 1 without considering the activation delay
I36
. The speed then increases as the operating tempera-
ture decreases until it reaches speed 3 when the operating temperature drops below
I08
-
I21
-
I18
- [
I27
x (FB -
I18
)].
Icon
turns on to indicate heating with the electric resistance is active.
If the operating temperature increases to
I08
-
I21
-
I18
, the speed remains constant at speed 1 until the temperature
exceeds
I08
-
I21
.
At this point the icon
turns off and, depending on the value of parameter
I28
, ventilation either stops after delay
I35
or continues for air recirculation:
if
I28
=0 or 2, the fan stops after delay
I35
.
if
I28
=1 or 3, the fan stays on at speed 1.
if
I28
=4 or 6, the fan stays on at speed selected manually.
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)
