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16.AUXILIARY FUNCTIONS

16.2 Compressor protection thermostats:

A protection thermostat can be configured for each of the 6 compressors on the 3 suction lines. Each thermostat has a sensor for measuring the

compressor temperature, a digital output for activating a cooling device and a shutdown alarm. The output is activated, and the high temperature alarm

only occurs when the compressor is on.

The output is activated if the sensor temperature is higher than the control temperature value (1.7.2.x.1) + hysteresis (1.7.2.x.3) and the

output is switched off if the temperature value is lower than the value is lower than the value of the control temperature.

In the Compressor protection thermostats function, a maximum temperature for compressor operation can be defined. If the compressor temperature

exceeds the value of Compressor shutdown temperature (1.7.2.x.2), the compressor will shut down and an alarm event will be created. The

compressor returns to operation when the thermostat temperature sensor is below the shutdown temperature minus hysteresis.

16.3 Adiabatic condensation:

Using the adiabatic condensation logic, it is possible to reduce the temperature of the external air in contact with the condenser and, consequently,

reduce the operating pressure of the discharge. The control of adiabatic condensation activates a water pump or a valve that feeds the water curtain

through which the external ais passes before reaching the condenser. The activation of the output is done by temperature control, using one or two

sensors, or exclusively by time acting by means of a cycle timer (time on and time off). The control is permanently active if its Control Mode

(1.7.3.x.1) is not determined using the Start time (1.7.3.1.13) and End time (1.7.3.1.14) or associated with a digital input.

16.3.1 Temperature control:

In the Temperature control mode, a sensor must be installed to measure the temperature of the external air (dry bulb sensor) and optionally another

sensor to measure the air temperature after passing through the water curtain (wet bulb sensor). The Control Mode (1.7.3.x.1) can be configured

as Temperature with a cycle timer and in this case the output cycles between on and off instead of remaining on, whenever the temperature activation

condition presents the activation condition. The cycle period must be configured in the parameters Time on (1.7.3.x.9) and Time off

(1.7.3.x.10).

If the parameters Temperature for actuation and / or Temperature for shutdown are set to OFF, the control is performed only by differential, using the two

sensors.

If the parameters Differential for actuation and / or Differential for shutdown are set to OFF, the control is performed only by temperature, using only the

dry bulb sensor.