A possible tool contractors can utilize when sending out a less experienced technician is data recording. On a new system startup or after a repair by an experienced technician, record some of the more pertinent system parameters. Those parameters would be recorded based on the type of system; for example, on a walk-in cooler perhaps record: 

• Suction and discharge pressures; 

• Evaporator superheat; 

• Condenser subcooling; 

• Compressor amperage draw; 

• Type of refrigerant; 

• Temperature of the air entering the condenser; and/or 

• Case temperature. 

On a reach-in cooler, recording the evaporator superheat and condenser subcooling would not be as beneficial and could be omitted. On ice machines, perhaps include ambient air temperature, inlet water temperature freeze time, and harvest time. Which parameters to include or omit can be customized by the contractor, as long as the information recorded will help another technician. The additional time required to record this data can be worth the time and effort. 

Where the information is recorded and stored can vary based on a company’s preference. It can be recorded on the equipment using some type of tag or marker, or it can be listed on the company’s work ticket or on a separate form. Any of these will work as long as they can be easily referenced by other technicians in the future.  

Another possible benefit to data recording is it can help a service contractor verify the system is working as intended. It could also serve as a check and balance between the company and its technicians.  

Recording this information can also be beneficial for maintenance inspections. If a system is still operational but a slight change in a differential between two parameters is observed, it may indicate an issue developing. For example, on a system with an air-cooled condenser, if the temperature difference between the refrigerant’s condensing temperature and inlet air temperature has changed, that could be a sign that the condenser coil needs cleaning. The coil might not look dirty and on inspection, you may have decided not to clean it, but after seeing the change in the temperature differential, you might rethink that decision. 

Data recording is only a useful tool if the information is accurate. If false information is recorded for the sake of completing a form or satisfying a company policy, then the value is lost, and it is a waste of time. Recording true and accurate information is the key to making this a valuable tool.