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 (K)
• Sub cooling (K)
• Water return temperature (°C)
• Water supply temperature (°C)
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 lter 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 lter 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 visible.
Maintenance
System
System
Task Frequency
Check the following against the commissioning records: 3 Months 12 Months 60 Months
Record operating conditions
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Water on/off temperatures
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Water pressure drop
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