System, System 131, Chillers turbochill™ air cooled and freecool – Airedale TurboChill FreeCool 200kW - 1830kW User Manual
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Chiller Technical Manual 7525355 V1.0.0_04_2013
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Chillers
TurboChill™ Air Cooled and FreeCool
Unit Operation Checks
Record the following operating conditions of the unit at stable conditions:
•
Suction pressure (bar)
•
Liquid pressure (Bar)
•
Discharge pressure (Bar)
•
Suction temperature (°C)
•
Liquid temperature (°C)
•
Discharge temperature (°C)
•
Superheat (°C)
•
Sub cooling (°C)
•
Water return temperature (°C)
•
Water supply temperature (°C)
Low supply water trip
To check operation of the low temperature trip the following procedure can be carried out.
With the unit running increase the low temperature limit to the actual supply water temperature.
This will trip the unit in a safe manner without risk of freezing the evaporator.
Return the low temperature limit to correct value after test (this will allow the unit to operate correctly).
Liquid line sight glass
Record the status of the liquid line sight glass:
•
Clear / Flashing
•
Wet / Dry
The sight glass is used to indicate:
•
The condition of the refrigerant in the system
•
Lack of refrigerant
•
Moisture content of the refrigerant
The colour of the sight glass depends on the moisture content of the refrigerant. The recommended moisture levels of a
system should be below 75ppm.
An indication of green / dry are to be considered as perfect conditions meaning full protection by the filter drier against
effects from moisture.
If the green colour starts to fade, the colour change from green to yellow has begun and the indicator should therefore
be watched carefully. If the colour changes to yellow it is a clear signal that the capacity of the filter drier is exceeded
and should be replaced as soon as possible.
F-Gas Leak Detection Checks
Perform an F-Gas refrigerant leak detection on the unit and ensure no refrigerant leaks are found.
Maintenance
System
Task
Frequency
System
3 Mths
12 Mths
60 Mths
Check the following against the commissioning records:
Record operating conditions.
●
Water on / off temperatures.
●
Water pressure drop.
●