44/126
TH-0xxSx1
• 4 PIPE HEATING/COOLING mode (
M01
=8)
The mode is selected automatically in relation to the operating temperature (see
“11. Regulation sensor(s)” page 24
).
If the operating temperature is greater than
I09
+ (
I21
: 2) the icon “
COOL
“ turns on to indicate that cooling mode is
active.
If the operating temperature is lower than
I09
- (
I21
: 2) the icon “
HEAT
“ turns on to indicate that heating mode is active.
When the unit is turned on, if the operating temperature is in the neutral zone (
I21
), the mode is set to heating.
The valves can be controlled with PI action if the integral time
I24
is non-zero, or with proportional action only if
I24
=0.
100
0
Temp.
PBH
(
I22
)
Outputs
BS4P
(
I09
)
PBC
(
I23
)
DZ
(
I21
)
AO1
AO3
ECM speed 1
% opening valve
Fan
ECM speed 3
(
I31
)
0%
100%
(
I31
)
0%
100%
AO2
AO2
If the operating temperature drops below
I09
- (
I21
: 2)
the heating valve starts to open (output
AO3
). Icon
turns on.
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 if the heating valve closes again, at which
point 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.
If the operating temperature rises above
I09
+ (
I21
: 2) the cooling valve starts to open (output
AO1
). Icon turns on.
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
).
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
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)
