Air conditioning system with orifice tube Troubleshooting Procedures parti 1

Air conditioning system with orifice tube
Troubleshooting Procedures
parti 1
orifice tube Air conditioning
 Correct evaluation of the pressure manometer display is particularly important. Here are some examples:
 
orifice tube:
Orifice tubes are used in systems that don’t use expansion valves. Like an expansion valve, the orifice tube is used to control the amount of refrigerant entering the evaporator. The diameter of the orifice tube is similarly small to that of the passage inside the expansion valve, but there is one big difference between orifice tubes and expansion valves. An orifice tube is a simple fixed device with no moving parts. It cannot vary the amount of refrigerant flowing into the evaporator the way an expansion valve can. So in systems that use orifice tubes, some additional method of refrigerant flow control must be employed. Two of the most popular methods used to do this are turning the compressor on and off at appropriate times, or cycling it, or installing a valve inside the compressor that can actually cause an adjustment to the pumping capacity of the compressor. This, of course, regulates the amount of refrigerant leaving the compressor.
 

1-
Low pressure:  
 high

High pressure:
high


Outflow temperature at the centre vent  :
 higher, up to ambient
temperature

 
 Possible causes:
 engine overheated, condenser
contaminated, condenser fan
defective-incorrect direction of
rotation, system overfilled

2- 
Low pressure:  
 normal to high

High pressure:
high

Outflow temperature at the centre vent  :
 higher

 Possible causes:
 system overfilled, condenser
contaminated

3-
Low pressure:  
 normal
 
High pressure:
 normal to high

Outflow temperature at the centre vent  :
fluctuating

 Possible causes:
humidity in the system,
orifice tube occasionally blocked


        abo bahaa eddine

 

3 Comments:

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