Refrigerator pumping down and charging
Refrigerator Repair – Refrigerant Cylinders and Fill Ratio
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 or vapour.
Two tubes supply refrigerant to the valves (Figure 12). One terminates at the top of the cylinder above the liquid level, and when the vapour valve (red) is opened [...]
Refrigerator Repair – Liquid Charging
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 valves are not seating properly there is a danger of liquid refrigerant entering the compressor cylinders, which can cause damage due to dynamic pressure when the compressor starts. The liquid [...]
8Nov2009 | admin | 0 comments | ContinuedRefrigerator Repair – Vapour Charging
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 performance, partial frosting of the evaporator and lower than normal operating pressures. Refrigerant may be added in vapour form to the low side of the system if the refrigerant is [...]
8Nov2009 | admin | 0 comments | ContinuedRefrigerator Repair – Adding Refrigerant
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 must be located, repaired and the system leak tested. If the leak is found to be on the low side of the system the repair can be made after the [...]
7Nov2009 | admin | 0 comments | ContinuedRefrigerator Repair – Pumping Down
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 storage in the condenser and the receiver, thereby making it possible for
other tasks to be performed.
The method is as follows:
1. Fit gauges, set the service valves to operating positions and [...]