Air conditioning system with orifice tube Troubleshooting Procedures parti 2

Air conditioning system with orifice tube

Troubleshooting Procedures
parti 2

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.

4-
Low pressure:  
high

High pressure:
normal 

Outflow temperature at the centre vent  :

higher

Possible causes:
orifice tube defective (cross-section)

5-

Low pressure:  
normal

High pressure:

normal

Outflow temperature at the centre vent  :

higher

Possible causes:

 too much refrigerant oil in the
system

6-

Low pressure:  
normal to low

High pressure:

normal to low

Outflow temperature at the centre vent  :

higher

Possible causes:

lack of refrigerant

7-

Low pressure:  
low pressure and high pressure are
the same

High pressure:

low pressure and high pressure are
the same

Outflow temperature at the centre vent  :

ambient temperature

Possible causes:

lack of refrigerant, compressor
defective, fault in the electrical
system

                          kandi younes