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The regulation logic is as follows:
Temp.
BHS
(
I07
)
ECM speed 1
% opening valve
Fan
ECM speed 3
PBH
(
I22
)
(
I31
)
0%
100%
100
0
Output valve
AO1
AO2
If the operating temperature drops below
I07
, 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 mo-
tor 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 2. The fan maintains speed
1 if
I28
=1 or 3.
The fan maintains speed selected manually if
I28
=4 or 6.
N.B.: if the minimum thermostat function is active, the
thermostat itself must be closed when the valve is in reg-
ulation, otherwise the fan will not start.
Cooling regulation is controlled as follows for 2 pipe heating/cooling mode (
M01
=2, 3, 4):
The “
COOL
” icon is on to indicate cooling mode.
The regulation logic is as follows:
Temp.
ECM speed 1
% opening valve
Fan
ECM speed 3
100
0
BCS
(
I08
)
PBC
(
I23
)
(
I31
)
0%
100%
Output valve
AO1
AO2
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 mo-
tor 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 manu-
ally 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
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)
