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TH-0xxSx1
• HEATING/HEATING mode (
M01
=1)
The “
HEAT
” icon is on to indicate that heating mode is active.
The regulation uses the following automatic speed control logic:
100
0
Temp.
PBH
(
I22
)
Outputs
valves
BHS
(
I07
)
DIFF
(
I20
)
PBH
(
I22
)
AO1
AO3
ECM speed 1
% opening valve
Fan
ECM speed 3
(
I31
)
0%
100%
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 motor auto-
matic speed control logic with 0..10 V modulating outputs” page 28
).
If the temperature drops below
I07
-
I20
the second valve starts opening (output
AO3
) with a proportional action.
The second valve opens completely if the temperature drops below
I07
-
I20
-
I22
.
Icon turns off when the valve (output
AO1
) 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 regulation,
otherwise the fan will not start.
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)
