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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.
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.
Wiring diagram
N L
DI
1
GN
D
DI
2
AI1 GN
D
AI2
DO
3
GN
D
AI3 GN
D
T1
T2
S1
S2
T3
CO
M
N
L
M1
0..
10
V
~
L
N
+
-
V1
R1
DO
1
AO1 GN
D
230V
ac
A +
B
-
MODBUS RTU
(TH-xMxxx)
