HWA1-A
Air/water chillers with axial fans
10
7.2
Calculation of the correction with 0-10V input
-
if the input is at 5 volts, the set point will be the value parameter setting.
-
if the input is at 0 volts, the actual set point will be:
set point - b15/2
.
-
if the input is 10 volts, the actual set point:
set point + b15/2.
The type of interpolation is linear
7.3
Calculation of the correction with ratiometric input
-
if the input is at
50%
the actual set point will be the value parameter setting (Coo/Hea) mode.
-
if the input is at 0% the actual set point will be:
set point (Coo/Hea) - b15/2
.
-
if the input is at 100% the actual set point will be:
set point (Coo/Hea) + b15/2
.
The type of interpolation is linear.
Another type of setting that allows to change the setpoint by adding (or subtracting) a value in function of the 0-10V analogue
input (if enabled). To enable the function, you must set the
H21
parameter to be
40
, and change the values of the parameter
b15
(range 0-10), taking into account that:
-
if the input is at 0 volts, the actual set point will be:
set point (Coo) - b15/2
.
-
if the input is at 5 volts, the set point will be the value parameter setting (Coo) mode.
-
if the input is 10 volts, the actual set point:
set point (Coo) + b15/2.
The 0-10V signal must be applied to the terminals AI10+ and AI10- (see the wiring diagrams).
Note:
In "cooling" mode, considering that the setpoint by default is set to be 7°C, the parameter (
b15)
should not assume any
value greater than or equal to 6 in order to prevent that the new setpoint set from 0-10V input to take values below the threshold
of the antifreeze operation which is 4°C.
7.3.1
Settings for standard climatic curves
HEATING
COOLING
Set-point
b08
b10
b12
b14
A
20°C
1
18°C
20°C
-27°C
B
20°C
1
13°C
20°C
-25°C
C
20°C
1
25°C
20°C
-29°C
D
40°C
1
10°C
20°C
-28°C
E
40°C
1
15°C
20°C
-25°C
Summary of Contents for HWA1-A 0140
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