19-10-2010, 10:11 AM
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Submitted by : -
Rajiv K. Singh
Suryakant N. Wahane
What do you mean by charging of refrigeration system?
The amount of refrigerant to be charge depends on size and installation and length of connecting pipe.
Direct expansion and condensation need that the outlet from the receiver be covered with liquid making a seal to prevent the gas into the liquid line.
It is generally advised not to have the receiver one third full at desired temp.
A sight glass in liquid line is used in a small size installation for finding the correct charge.
HOW DO WE KNOW TIME OF charging of refrigerator?
During the operation , if any bubble or foam is seen, it indicate insufficient refrigerant in the system ,hence more charge is added until no bubble are observed .
If refrigerator is under charged, the compressor suction starts and delivery become superheated, delivery pressure may be low, there will be a large bubble in the liquid line sight glass.
If refrigerator is over charged , delivery pressure may be high, delivery temp. will be low.
Hence refrigerant quantity to be charged is decided by taking the weight of charging cylinder before and after charging by spring balance.
What are the necessary factors for charging of refrigeration system?
Use of clean oil and moisture free drums for transfer and charging purpose.
The system should be evacuated properly .
Charging line must be purged and it must be made sure that all connections are air tight.
The suction pressure may not be allowed to rise above during charging .
The refrigerant in the liquid form should under no circumstance be introduce to the compressor .
Charging line should be flexible.
What are the generally used methods of charging?
Following are the two methods of charging
LOW PRESSURE CHARGING.
HIGH PRESSURE CHARGING.
Submitted by : -
Rajiv K. Singh
Suryakant N. Wahane
charging and testing of refrigeration system
What do you mean by charging of refrigeration system?
The amount of refrigerant to be charge depends on size and installation and length of connecting pipe.
Direct expansion and condensation need that the outlet from the receiver be covered with liquid making a seal to prevent the gas into the liquid line.
It is generally advised not to have the receiver one third full at desired temp.
A sight glass in liquid line is used in a small size installation for finding the correct charge.
HOW DO WE KNOW TIME OF charging of refrigerator?
During the operation , if any bubble or foam is seen, it indicate insufficient refrigerant in the system ,hence more charge is added until no bubble are observed .
If refrigerator is under charged, the compressor suction starts and delivery become superheated, delivery pressure may be low, there will be a large bubble in the liquid line sight glass.
If refrigerator is over charged , delivery pressure may be high, delivery temp. will be low.
Hence refrigerant quantity to be charged is decided by taking the weight of charging cylinder before and after charging by spring balance.
What are the necessary factors for charging of refrigeration system?
Use of clean oil and moisture free drums for transfer and charging purpose.
The system should be evacuated properly .
Charging line must be purged and it must be made sure that all connections are air tight.
The suction pressure may not be allowed to rise above during charging .
The refrigerant in the liquid form should under no circumstance be introduce to the compressor .
Charging line should be flexible.
What are the generally used methods of charging?
Following are the two methods of charging
LOW PRESSURE CHARGING.
HIGH PRESSURE CHARGING.
