Chillers
ULTIMA FREECOOL
Chillers
Installation & Maintenance Manual : 903-125 IM E 05/04/A
35
Commissioning Procedure
The following should be carried out with a load on the system, otherwise the unit is likely
to short cycle. The following tests are to be carried out on 1 circuit at a time.
•
Switch the door interlocking MCCB to the ON position but again only on the circuit
which is to be tested.
•
Adjust the water temperature supply and return set points to match the
system requirements.
•
To switch the unit ON
, use the microprocessor keypad as follows:
Press
Prg
, press
, press
, press
& finally
.
•
Check liquid injection solenoid valve is energised and sight glass is clear.
COMMISSIONING
CHECKLIST
•
Check pressures at suction and discharge ports for correct phase rotation.
If there is no liquid present or no differential pressure occurs, isolate immediately.
CAUTION
•
Check the unloading solenoids operate in the correct sequence - refer to
•
Measure and record the compressor amps once the compressor is fully loaded
and at each stage of unloading.
•
Measure and record full speed amps of each condenser.
•
Ensure that the refrigeration safety cut outs trip at the following settings:
RECORD
LP micro - adjustable – refer to
LP safety 0.6 +/- 0.1 BarG - fixed
HP safety 24.5 +/- 0.7 BarG - fixed
Clear the alarm as detailed in the
CAUTION
The microprocessor LP setting is adjustable via the micro display. The standard
setting is 3.2BarG. This can be altered to suit the medium, however this MUST NOT
be lower than the medium’s freezing point.
•
Ensure that the low water temperature safety cuts out at the correct setting
+/- 0.5°C, to clear the alarms refer to
For water (no glycol) application the recommended setting is 3°C or 3°C below the
design supply water temperature.
•
Check the liquid line sight glass is clear and dry.
•
Check the superheat setting adjust the expansion valve to maintain a superheat
setting of 5 – 8°C at all operating loads.
•
Check and record the following:
Suction and discharge pressures
Liquid, discharge and suction line temperature
RECORD
Water inlet and outlet temperature across the evaporator
•
Ensure the above are all within the design parameters.
•
Repeat as follows for each circuit:
•
To switch the unit OFF
, use the microprocessor keypad as follows:
Press
Prg
, press
, press
, press
& finally
.
•
To switch the unit ON,
repeat above.
•
Restart remote ON/OFF if required.
The unit is now commissioned and will provide many years of trouble free operation
providing the maintenance schedule is followed.
