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The regulation logic is as follows (I53=0, without pump):
speed 1
Fan
speed 3
BHS
(
I07
)
speed 2
(
I26
)
(
I27
)
ON
OFF
Temp.
HH
(
I18
)
Output
Temp.
FB
DO5
DO4
DO3
DO1
- Operation with
M02
=0 or 2 (digital output
DO1
does not control an electric resistance).
If the operating temperature drops below
I07
- (
I18
: 2) relay
DO1
is activated and the fan starts at speed 1 after startup
delay
I36
.
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
)].
The icon turns on to indicate that heating is active.
If the operating temperature increases to
I07
- (
I18
: 2) the speed remains constant at speed 1 until the operating tem-
perature rises above
I07
+ (
I18
: 2).
At this point, icon turns off and, depending on the value of parameter
I28,
the fan either stops or continues running:
if
I28
=0 o 2, the fan stops,
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.
- Operation with
M02
=1 or 3 (digital output
DO1
controls an electric resistance).
If the operating temperature drops below
I07
- (
I18
: 2) relay
DO1
is activated and the fan starts immediately at speed 1
regardless of the startup delay
I36
.
If the temperature continues to fall, the speeds switch as follows:
- the speed switches from speed 1 to speed 2 when the temperature drops below
I07
- (
I18
: 2) - [
I26
x (FB -
I18
)],
- the speed switches from speed 2 to speed 3 when the temperature drops below
I07
- (
I18
: 2) - [
I27
x (FB -
I18
)].
Icons and
turn on to indicate heating active with electric resistance.
If the operating temperature increases to
I07
- (
I18
: 2) the speed remains constant at speed 1, until the operating tem-
perature exceeds
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 the electric resistance is on, the fan starts immediately regardless of the position of the
minimum thermostat,
- parameter
I25
is not used.
Cooling regulation is controlled as follows for 2 pipe heating/cooling mode (
M01
=2, 3, 4):
The “
COOL
” icon is on to indicate that cooling mode is active.
