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Cooling regulation is controlled as follows for 2 pipe heating/cooling mode (
M01
=5, 6, 7):
- Operation without half season function (
M15
=0):
The “
COOL
” icon is on to indicate that cooling mode is active.
The regulation logic is as follows:
ON
OFF
Temp.
Output
ECM speed 1
Temp.
Fan
ECM speed 3
HC
(
I19
)
BCS
(
I08
)
FB
(
I27
< 100%)
DO1
AO1
I27 = 100%
If the operating temperature rises above
I08
+ (
I19
: 2) relay
DO1
is activated and the fan starts (output
AO1
) at speed 1
after startup delay
I36
. The speed then increases as the operating temperature increases, arriving at speed 3 when the
operating temperature exceeds
I08
+ (
I19
: 2) + [
I27
x (FB -
I19
)].
The icon turns on to indicate that cooling mode is active.
If the operating temperature drops to
I08
+ (
I19
: 2) the speed remains constant at speed 1, until the operating tempera-
ture drops below
I08
- (
I19
: 2).
The icon now turns off and, depending on the value of
I28
, the fan either stops or stays on:
if
I28
=0 or 3, the fan stops,
if
I28
=1 or 2, the fan stays on at speed 1.
if
I28
=4 or 5, the fan stays on at speed selected manually.
- Operation with half season function (
M15
=1):
The “
COOL
” icon is on to indicate that cooling mode is active.
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
I08
+ (
I19
: 2), the icon “
COOL
“ turns on to indicate that cooling mode is
active.
If the operating temperature is lower than
I08
- (
I19
: 2) -
I21
-
I18
, the icon “
HEAT
“ turns on to indicate that heating
mode is active.
