Ultima Compact™
Chillers
14 Ultima Compact 30-150kW Technical Manual 9690553 V1.2.0_10_2019
Temperature Control
The microprocessor controller shall monitor the return and supply temperatures.
The return temperature is used to
generate cooling demand based on the supply temperature setpoint, and the specified unit TD. Using the return gives
smoother control by leveraging the volume of water in the system as a temperature buffer (supply temp tends to jump
up and down quickly when compressors are enabled or disabled).
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 up to 4 cooling
stages 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)
BMS systems allow remote interrogation of parameters from within the unit, including but not limited to; probe readings,
alarms and unit status.
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.
Introduction