Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 42)

OPTICHILL Chillers
42
Chillers
Installation & Maintenance : 6564868 02/2013
Controls
ALARMS The controller logs and allows viewing of the last 100 conditions recorded in descending
chronological order.
1
2
3
4
5
1 Alarm Label
2 Alarm Status: Alarm Active
or Alarm Cleared
3 Time of Alarm
4 Alarm Log
5 Date of Alarm
Alarm Handling
1 A Red LED behind the Alarm key will light in the event of an alarm. To view the
alarms, simply press the key and the keys to scroll through.
2 Auto reset alarms will clear following this first depression of the Alarm key. If
however the Red LED behind the Alarm key remains illuminated, the unit
requires some form of manual reset.
3 For manual reset alarms, isolate the affected circuits before further investigation.
4 To reset or delete the alarms displayed in the alarm screen, simply press again.
COMMON ALARMS Outlined below is a selection of Common Alarms, a full list is available, please
contact Airedale.
Phase Rotation or MCCB A normally closed contact. When Phase Rotation is incorrect all controller outputs are
de-activated.
Emergency Stop A normally open contact. On closing, all controller outputs are de-activated.
Evaporator Flow Failure A normally closed contact. On opening, all controller outputs are de-activated.
Low Supply
Temperature Supply Water Temperature Low Limit alarm is generated when the supply water
temperature falls below the low limit value set. All controller outputs are de-activated.
INDIVIDUAL CIRCUIT
ALARMS Outlined below is a selection of Individual Circuit Alarms, a full list is, please
contact Airedale.
Electronic Expansion
Valve Failure This indicates that the electronic expansion valve controller has detected an
operating problem.
Low Suction Pressure When the suction pressure sensor value falls below the value set by the low suction level
for a period exceeding 1 minute (or 3 minutes on compressor start-up), a visual alarm will
be generated at the in-built display and the relevant compressor will be de-activated.
High Liquid Pressure When the liquid pressure reaches 14.6 barg, the relevant circuit will be switched off and
an alarm activated, this can only be rectified by manual reset via the microprocessor.
Compressor Status A normally closed contact when the compressor is operating. If this contact remains open
for a period of 5 seconds during operation of the compressor, a visual alarm is generated
and the relevant compressor will be de-activated.
This alarm comprises of compressor
motor protection module, discharge gas thermostat and safety high pressure switch.