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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 propor-
tional action if
I24
=0.
The fan (output
AO2
) starts when the valve
reaches the minimum aperture given by param-
eter
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 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 ac-
tive, the thermostat itself must be closed when the valve is in regulation, 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 propor-
tional action if
I24
=0.
The fan (output
AO2
) starts when the valve
reaches the minimum aperture given by param-
eter
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 main-
tains 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
AO1 GN
D
230Vac
AO2
G
G0
24Vac
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)
