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TH-3xxSx1
• 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.
At startup, if the operating temperature is in the neutral zone, the “
HEAT
“ icon turns on.
BS4P
(
I09
)
DZ
(
I21
)
speed 1
Fan
speed 3
speed 2
(
I26
)
(
I27
)
100
0
Temp.
Output
% opening
valve
DO3
DO2
DO1
(
I26
)
(
I27
)
DO3
DO2
DO1
PBH
(
I22
)
AO1
AO2
PBC
(
I23
)
(
I25
)(
I25
)
If the operating temperature drops below
I09
- (
I21
: 2) the heating valve starts to open (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 starts when the valve reaches the aperture defined in
I25
and after startup delay
I36
.
If the temperature continues falling, the speed switches from speed 1 to speed 2 when the valve reaches the aperture
given in
I26
. The speed switches from speed 2 to speed 3 when the valve reaches the aperture given in
I27
.
Each speed is subject to a hysteresis of 20% of its activation point.
For example, for speed 3:
if
I27
=100%, speed 3 is activated when the valve reaches fully open and is deactivated when the valve closes by 20%
of
I27
, which is 80% of fully open in this case.
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 regulation,
otherwise the fan will not start.
If the operating temperature rises above
I09
+ (
I21
: 2) the cooling valve starts to open (output
AO2
). 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 starts when the valve reaches the aperture defined in
I25
and after startup delay
I36
.
If the temperature continues increasing, the speed switches from speed 1 to speed 2 when the valve reaches the aper-
ture given in
I26
. The speed switches from speed 2 to speed 3 when the valve reaches the aperture given in
I27
.
Each speed is subject to a hysteresis of 20% of its activation point.
