OPERATING AND MAINTENANCE MANUAL
Chapter 7 - Electronic controller
TAEevo Tech 015÷802 60 Hz UL
61
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
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7.15.8 Compressors starting time limitation
If there are several compressors in a circuit but only one is running, after programmable running time (CO52) the compressor
is stopped and another compressor is started (the first free compressor in accordance with the running hours or number of
starts).
7.16 Unloading function
This function makes it possible to reduce cooling capacity of the unit when required; it may affect the entire unit or a single
circuit and it is achieved by stopping one or more compressors. The unloading types are as follows:
• Unloading due to high temperature: having defined an unloading set and differential, if the temperature
measured by the probe remains above the set for an activation time, in each circuit one compressor is stopped.
If the temperature of the probe becomes lower than or equal to an unloading set less the differential, or if the
associated maximum duration has elapsed, the unloading function is deactivated and the compressors are
restarted.
• Unloading due to high pressure (if high pressure transducer is present): having defined a set, a differential
and an unloading time, if the condensing pressure measured in a circuit is greater than or equal to the set the
unloading function is activated in the circuit and then a compressor is stopped in only the circuit involved.
The unloading function is deactivated only if the condensing pressure decreases and remains below the
unloading set for a preset time or if it falls below set - diff.
7.17 Fans control
On TAEevo Tech units the fans can be controlled in the following ways:
• ON/OFF
•by steps
The selection is made on the basis of the unit configuration.
7.17.1 Units configured with “STEP” fans
(only models TAEevo Tech 402÷802)
These units are equipped with a pressure transducer located on the refrigerant compressor discharge pipeline.
On the basis of the pressure read by the transducer, the electronic controller manages operation of the fans according to ON-
OFF logic, i.e. supplying or disconnecting power to the fans.
7.17.2 Fan control diagrams
The following diagram illustrates the fans STEP control logic in accordance changes in condensing pressure.
STEP diagram (models TAEevo Tech 402÷802 only):
7.18 Hydraulic unit
The circulator pump is only installed on request; in general terms the following configurations are possible:
• Without pump
• Single pump
When the unit is powered on the pump (if installed) starts and continues to run until the unit is set to OFF.
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