Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 30)

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Introduction
Chiller Technical Manual 7525355 V1.1.0_04_2013
Chillers TurboChill™ Air Cooled and FreeCool
Temperature Control
The microprocessor controller shall monitor the return and supply temperatures. The supply temperature is used to
calculate the required cooling demand. Further calculations are then made to determine the optimum compressors to be
selected and their individual cooling demands. These calculations ensure the unit efficiency is maximised under all load
conditions. As standard, the microprocessor controller can provide an infinite capacity control between 15% and 100%,
depending on the component selection. Refer to mechanical data tables for unit specific control ranges.
Monitoring
The microprocessor shall also monitor and display the following measured parameters:
•
Supply water temperature
• Return water temperature
• Liquid pressure
• Suction pressure
• Evaporator differential water pressure
Alarm Handling
The controller shall log and allow viewing of the last 150 conditions recorded in descending chronological order through
the keypad display.
The following conditions shall be detected, triggering a visual display:
• High compressor discharge temperature (per compressor)
• Low supply temperature
• Phase rotation
• Emergency stop
• Evaporator flow failure
• Low pressure safety switch
• Low suction pressure (per compressor)
• High liquid pressure
• Compressor 1 contactor status
• Compressor 2 contactor status (dependant on model)
• Volt free contact non-critical alarm indication
• Volt free contact critical alarm indication
Building Management Systems (BMS)
Sequencing (Master / Slave and Run / Standby) via the Airedale sequence manager.
Please specify at time of enquiry.
Chiller Sequence Manager
For the efficient temperature and capacity operation of multiple units on a single site, the sequence manager will permit
interlinked operation of the complete system thereby providing optimum temperature control and minimum power
consumption.
Up to 6 units can be sequenced.
Included within this package is a site visit by an Airedale Control Specialist to set up multiple unit sequence control.
The chiller sequence manager is supplied as a separate control panel to be mounted remotely in an indoor location,
such as a plant room.