45/126
TH-0xxSx1
• 4 PIPE HEATING/COOLING mode + ELECTRIC RESISTANCE (
M01
=9)
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.
DIFF
(
I20
)
Outputs
BS4P
(
I09
)
DZ
(
I21
)
HH
(
I18
)
PBC
(
I23
)
PBH
(
I22
)
DO1
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
).
If the temperature drops below
I09
- (
I21
: 2) -
I20
-
I18,
the electric resistance output (
DO1
) is activated and the
icon
turns on.
If the temperature returns to above
I09
- (
I21
: 2) -
I20
the electric resistance output is deactivated and icon
turns off.
A timer now starts (parameter
I35
) during which the fan
cannot be turned off even if the setpoint is reached. Once
delay
I35
has expired, the fan can be turned off if neces
-
sary.
When the electric resistance turns on, the fan turns on immediately regardless of the ventilation delay set in parameter
I36
and the position of the minimum thermostat (if in use).
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 regulation,
otherwise the fan will not start. If, on the other hand, the electric resistance turns on, the fan starts immediately regardless
of the position of the minimum thermostat.
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
GN
D
AI3 GN
D
T1
T2
S1
S2
T3
N
L
M1
0..
10
V
~
+
-
V1
AO1 GN
D
230Vac
AO2
G
G0
24Vac
GN
D
AO3
V2
DO
1
CO
M
R1
Y G0
Y G0
A +
B
-
MODBUS RTU
(TH-xMxxx)
N.B.: only standard EC motors can be used for this application (
M14
=1).
