This is the ratio between the suction pressure and the discharge pressure. No refrigeration compressor is 100 per cent efficient, owing to various losses. It…
Manufacturers of refrigeration condensing units will supply technical data for their products on demand, but this will be based on ideal operating conditions in controlled…
It is important that the temperature difference (TD) between the product being stored and the refrigerant is correct for that product. Too wide a TD…
Refrigerant bulk cylinders and some service cylinders are fitted with two shutoff valves, which are colour coded and marked to indicate delivery of either liquid…
This method is not always acceptable to manufacturers, since it involves putting refrigerant liquid into the high side of the system. If the compressor discharge…
A slight loss of refrigerant is recognized by ‘bubbles’ in the liquid-indicating sight glass installed in the liquid line of a system, a loss of…
When it is necessary to add refrigerant to a system after a loss it indicates that there is a leak in the system. The leak…
This procedure transfers the refrigerant circulating around the system from the liquid shut-off valve at the liquid receiver to the inlet of the compressor for…
Although the common refrigerants (RI2, R22, R502 etc.) are not considered hazardous, it must be remembered that all refrigerants are heavier than air and will…
This is carried out on new system installations or when a plant has been discharged of refrigerant prior to repair. It involves the use of…