11
Electrical accessories
LIID Limitation of the current absorbed by digital input
When this accessory is requested, a digital input is prepared in the terminal board to activate the forced ca
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pacity reduction of the unit to a set fixed level.
This accessory is useful when there is a need to necessarily limit the power absorbed by the unit as regards
particular conditions.
We point out that, in some conditions (for example, during hourly compressor rotation procedures), the con
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troller could force the unit to operate at full capacity for limited periods of time.
SETD Double set point from digital input
The accessory allows you to preset two different operating set points and manage the change from one to the
other through a digital signal.
The set point temperatures must be specified when ordering. For optimization of the unit, reference will be
made to the lower set point in chiller mode and the higher set point in heat pump mode.
Unless otherwise specified in the order, the controller will be set at the factory with the following temperatures:
•
in chiller mode, set point 1 to 7°C and set point 2 to 12°C
•
in heat pump mode (only for HPW and OH units) set point 1 at 45°C and set point 2 at 40°C
CSP
Set point compensation depending on external air temperature
For units fitted with this accessory, the set point of the unit is set so that it can vary between two values, a
maximum and a minimum, depending on the external air temperature. The compensation ramp and the max
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imum and minimum values of the set point can be changed by the user.
Unless otherwise specified in the order, the controller will be set to implement a positive compensation logic
according to the temperatures shown in the following diagrams:
Positive compensation
Negative compensation
Chiller
Heat pump
SET POINT 2
17/12°C
SET POINT 1
12/7°C
25°C
35°C
SET POINT 2
17/12°C
SET POINT 1
12/7°C
25°C
35°C
SET POINT 2
40/45°C
SET POINT 1
35/40°C
0°C
15°C
SET POINT 2
40/45°C
SET POINT 1
35/40°C
0°C
15°C
External air temperature
External air temperature
External air temperature
External air temperature
IA
Automatic circuit breakers (instead of fuses)
This accessory requires the installation of automatic circuit breakers, instead of fuses, for the protection of
auxiliary loads. Also, the same accessory uses automatic circuit breakers with adjustable thermal overload
protection to protect the compressors.
