Chillers
Introduction
DeltaChill™ Air Cooled and FreeCool
26
Chiller Technical Manual 7267818 V1.13.0_01_2018
Alarm Handling
The controller logs and allows viewing of the last 100 conditions recorded in descending chronological order through the
keypad display.
The following conditions will be detected, triggering a visual display:
Common for both circuits (Multiple Circuit units):
●
Low Supply Temperature
●
Emergency Stop
●
Water Flow
●
Pump(s) status
●
Pump(s) remote start
●
Volt Free Contact Alarm Indication
Individual for each circuit:
●
Individual alarms will isolate the affected circuit only.
●
Compressor Trip
●
Low Suction Pressure for each circuit
●
High Liquid Pressure for each circuit
●
Low Pressure Switch
●
Compressor Overload
●
High Compressor Discharge Temperature
Compressor Fast Start
Fast start is initiated following a 3 phase mains power failure. The chiller can go into fast start mode if the return water
temperature is10°C or more above the supply water temperature set point.
The maximum number of fast starts is factory set to 4 in 24 hours. It is adjustable between 1 and 4 events.
If the maximum number of fast starts is exceeded, an alarm will be generated – manual reset fast start limit alarm.
Optional Features
Networking
A Local Area Network (LAN) can be used to connect a number of chiller controllers to offer intercommunication and
sequence control. There is also the facility to allow the connection of either a computer or modem for local or remote
monitoring. For further details, please contact Airedale.
When adding to an existing network, please consult Airedale to ensure strategy compatibility.
Unit Remote ON/OFF
Disables/Enables the Chiller remotely.
Compressor Anti Cycle Control
Automatic via the Microprocessor.
Compressor Load Limit
Limits the condensing pressure by unloading above 35 Barg.
Limits the evaporating pressure by unloading at the minimum pressure set point, which is, adjustable depending on
system glycol content.
Pump(s) Remote ON/OFF
Disables/Enables the pump(s) remotely.
Remote Setback Temperature Set point Switch
A setback set point for supply water temperature can be selected to suit summer/winter conditions or night setback.
Remote Set Point Adjust
Allows the chilled water set point to be adjusted via an external 0-10V signal or Digital Input.
Compressor Hours Run
Displays hours run of each compressor.
Password Protection
The control system integrity can be maintained by restricting access with a password PIN number. To change the PIN
number; please contact Airedale at time of order with the preferred 4 digit number.
Ultracap Uninterrupted Power Supply
The Ultracap module is an optional external backup device for the EVD Evolution used to close the valve in the event
of mains power failures. The module guarantees temporary power to the EVD Evolution in the event of power failures,
for enough time to immediately close the connected electronic valve. It avoids the need to install a solenoid valve in the
refrigerant circuit or use the battery backup module.
Ultracap storage capacitors (EDLC = Electric Double Layer Capacitor), which are recharged independently by the
module. Ultracap capacitors ensure reliability in terms of much longer component life than a module made with lead
batteries: the life of the Ultracap module is at least 10 years. In addition, not using lead batteries also means no special
precautions are required regarding safety and pollution.
