MAINTENANCE AND OPERATING MANUAL
Electronic controller
HAS T 070÷140
65
ENGLISH
EN
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.
6.7.4.4Minimum times
In order to maintain correct operation of the unit-s compressors, times for compressor starting and stopping must be
observed. Compressor times, which can be modified from the display, are as follows:
• Compressors starting time lag at the time of unit start-up: this is the time lag between the time of start-up
of the unit and starting of the first compressor
• Minimum ON time: minimum operating time that each compressor must comply with;
• Minimum OFF time: minimum stopped time that each compressor must comply with;
• Same compressor starts time: minimum time that must elapse between consecutive starts of the same
compressor;
• Start times between different compressors: minimum time that must elapse between starts of two different
compressors;
• Stopping times between different compressors: minimum time that must elapse between stopping of two
different compressors;
• Starts time between compressors in defrost: minimum time that must elapse between starts of two different
compressors during the defrost cycle (see "6.7.9 Defrost").
6.7.5 Fans
The parameters for control of the unit's fans can be set up in the menu.
The menu is accessible via the service level password. The types of fans present in the unit are shown in the configuration
menu.
The fans menu masks provide the facility to display the following information for each circuit:
• operating parameters step controlled fans
• operating parameters step controlled fans with low-noise
• operating parameters speed controlled fans
• operating parameters speed controlled fans with low-noise
6.7.5.1Low Noise
You can program different setpoints for low noise operation in order to reduce noise emissions of the system during the night
time.
The settings of the fans for operation in low-noise mode are utilised also for defrost mode.
6.7.5.2Fans step control
Involves activation of a series of steps of fans in accordance with the reference condensing pressure value.
The activation logic of the steps in chiller mode is shown in the following diagram:
Chiller
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