Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 40)

OptiChill Freecool
Active Cabinet Exhaust
Chillers
40
Chillers
Technical Manual : 7197700 v1.2.0. 02_2013
Controls
Monitoring The microprocessor also monitors and displays the following measured parameters:

Supply Water Temperature

Return Water Temperature

Evaporator Differential Water Pressure

Suction Pressure of each circuit

Liquid Pressure of each circuit

Suction Temperature at each circuit

Superheat for each circuit

Discharge temperature of each circuit
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:

Low Supply Temperature

Emergency Stop

Water Flow

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

Circuit 1 Isolator Status

Circuit 2 Isolator Status
Unit Remote ON/OFF Disables/Enables the unit remotely.
Compressor Anti Cycle
Control
Automatic via the Microprocessor.
Compressor Load Limit
Limits the condensing pressure by unloading the compressor.
Limits the evaporating pressure by unloading at the minimum pressure setpoint, which is,
adjustable depending on system glycol content.
Pump(s) Remote ON/OFF Disables/Enables the pump(s) remotely.
Remote Setback
Temperature Setpoint
Switch
A setback setpoint for supply water temperature can be selected to suit summer/winter
conditions or night setback.
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. (as standard 4648)
CAUTION IMPORTANT: To change the PIN number; please contact Airedale at time of order
with the preferred 4 digit number.