Introduction
26
Chiller Technical Manual 9635376 V1.3.0_06_2019
Chillers
TurboChill™ R513A 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 between
minimum unloading capacity and 100% depending upon component selection and operating conditions. 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.
●
Refrigerant leak detection.
●
Compressor 1 contactor status.
●
Compressor 2 contactor status. (dependant on model).
●
Compressor 3 contactor status (dependant on model).
●
Compressor 4 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.