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• 2 PIPE HEATING/COOLING with SEASON CHANGEOVER by PARAMETER (
M01
=4):
The season is selected manually (see
“MODE button functionality” page 9)
.
Once you have made the selection, either “
HEAT
” or “
COOL
” is displayed, depending on the mode.
Heating regulation is controlled as follows for 2 pipe heating/cooling mode (
M01
=2, 3, 4):
The “
HEAT
” icon is on to indicate that heating mode is active.
The regulation logic is as follows:
ON
OFF
Temp.
HH
(
I18
)
Output
BHS
(
I07
)
ECM speed 1
Temp.
FB
Fan
ECM speed 3
(
I27
< 100%)
DO1
AO1
I27 = 100%
- 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 (output
AO1
) at speed
1 after startup delay
I36
. The speed increases as the operating temperature drops, reaching speed 3 when the operating
temperature falls 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
. The speed then increases as the operating temperature drops until it reaches speed
3 when the operating temperature falls below
I07
- (
I18
: 2) - [
I27
x (FB -
I18
)].
Icons and
turn on to indicate heating with electric resistance.
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, icons and
turn off and, depending on the value of
I28
, the fan either stops after a delay
I35
or stays
on for air recirculation:
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.
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.
