Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 53)

Chillers OPTICHILL
Chillers
53
Installation & Maintenance : 6564868 02/2013
Commissioning Procedure
PRE COMMISSIONING CHECKLIST
Adjust the water temperature supply and return set points (if necessary) to call for 100%
cooling (refer to
Controls , on page 39).

Ensure all KNOBS and SWITCHES are adjusted to suit the design requirements
(refer to
Controls , on page 39)

To switch the unit ON, use the microprocessor keypad as follows:
Press
Prg
, press , press , press & finally
CAUTION There will always be a delay between the enabling of the unit and the energising of
the compressor contactors, anything between 1 to 2 minutes. Be patient.
Check that there is a 2 seconds delay between the Star and Delta contactor energising on
each circuit.
CAUTION This delay period would be 0.7 seconds in Closed Transition Starting.

Check capacity control timing as detailed previously

Check that each circuit trips on low pressure, the alarm should appear within
3 minutes

The alarm will be recognised at the display circuit trip, to clear the alarms refer to
Alarm Handling , on page 42
CAUTION Prior to the chiller compressors being allowed to start, the Water Flow Fail and
Pump Interlock features MUST both be proven to work correctly.
To check the water flow fail safety protection is working satisfactorily:
RECORD 
Reduce the flow rate to 75% of design and ensure that the evaporator pressure or
flow protection switch trips at this flow rate, adjust as necessary
 With compressors off, ensure this alarm is recognised as “Water Flow Fail” at the
display and disengages the circuits operation immediately, restore flow rate to the
design and check the alarm has self-cleared
To check the pump interlock safety feature works satisfactorily:
RECORD 
Switch off the chiller water pump and check the interlock wiring connections at the
chiller are open circuit

To switch the unit OFF, use the microprocessor keypad as follows:
Press
Prg
, press , press , press & finally

Fully open all liquid line and discharge service ball valves on each circuit
CAUTION Re-instate both the liquid injection and liquid line solenoid valves.
Remove the link from the MCCB for the auxiliary alarm contact.
Fully open all liquid line and discharge service ball valves on each circuit.