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TH-4xxSx1
• HEATING/HEATING mode (
M01
=1)
The “
HEAT
” icon is on to indicate that heating mode is active.
The regulation logic is as follows:
ON
OFF
Temp.
HH
(
I18
)
Outputs
BHS
(
I07
)
HH
(
I18
)
DIFF
(
I20
)
DO1
DO2
speed 1
Fan
speed 3
speed 2
(
I26
)
(
I27
)
Temp.
FB
DO5
DO4
DO3
If the operating temperature drops below
I07
- (
I18
: 2) relay
DO1
is activated.
Icon turns on if
M02
=2 and icons and
both turn on if
M02
=1
or 3.
The fan starts at speed 1, after the startup delay
I36
, if
M02
=2.
The fan starts at speed 1 immediately, regardless of the startup
delay
I36
if
M02
=1 or 3.
If the temperature continues to fall, the speeds switch as follows:
- speed 1 to speed 2, when the temperature drops below
I07
- (
I18
: 2) - [
I26
x (FB -
I18
)],
- speed 2 to speed 3, when the temperature drops below
I07
- (
I18
: 2) - [
I27
x (FB -
I18
)].
If the operating temperature drops below
I07
- (
I18
: 2) -
I20
, stage
2 is activated (output
DO2
)
If the temperature rises above
I07
+ (
I18
: 2) -
I20
, stage 2 is de-
activated. If
M02
=2, icon
turns off.
If the operating temperature increases to
I07
- (
I18
: 2) the speed
remains constant at speed 1, until the operating temperature ex
-
ceeds
I07
+ (
I18
: 2)
Icons and
now turn off and, depending on the value of
I28,
the fan turns off after delay
I35
or stays on for air re-
circulation:
if
I28
=0 or 2, the fan stops after delay
I35
.
if
I28
=1 or 3, the fan stays on at speed 1.
if
I28
=4 or 6, the fan stays on at speed selected manually.
Speed 1 is activated and deactivated together with the heating output.
The hysteresis of speeds 2 and 3 is calculated automatically at 20% of the FB band (see
“3 speed on-off motor speed
control logic with on/off outputs” page 29
).
Example: if
I18
=0.5°C, FB=2°C, the hysteresis of speeds 2 and 3 is 0.4°C.
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.
- parameter
I25
is not used.
Wiring diagram
V1
R1
N L
DI
1
GN
D
DI
2
AI1 GN
D
AI2
DO
1
DO
2
DO
3
DO
4
GN
D
AI3 GN
D
T1
T2
S1
S2
T3
V2
R2
M1
I
II
III
DO
5
CO
M
N
L
230V
ac
A +
B
-
MODBUS RTU
(TH-xMxxx)
