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HVAC
FLUSHING OF A/C SYSTEM
Flushing is a process of removing foreign particles from
the A/C system.
Flushing must be performed when the system is
contaminated or there is debris in the system from
compressor failure.
WhenA/C compressors fail, it may cause bad effects.
The typical A/C compressor is built like a small
reciprocating engine. They have cylinders, pistons,
piston rings, valves, bearings, etc. When a
compressor fails it often sheds fragments of these
internal components. This can happen all at once or
slowly over time. Little bits/pieces of compressor can
end up in condenser, hose assemblies, expansion
valve and evaporator.
NOTE:
1. If we replace a compressor and don’t flush all of
this foreign material out of the system,
this debris would circulate through the system and
the cycle would repeat itself as the new
compressor grinds to a halt.
2. Flushing also removes excess oil from the system.
If you suspect the system contains too much oil,
flushing is a way to start fresh so you can establish
the correct quantity of refrigerant oil in the system.
Following points should be noted while
performing a flushing process:
1. Flush individual components.
2. Self made flushing will be required asA/C system
component fittings all differ in size, shape and
thread size.
3. When replacing air conditioning parts with new
ones, it is necessary to replenish oil by approx.
the same amount which is remaining in each part.
4. Reverse flush components.
5. Do not flush through a compressor otherwise
possible internal damage could occur.
6. Recover / recycle flushing refrigerant, the recovery
device will remove contaminants through a
filtration system.
CAUTION:
Be sure to use specified compressor oil only.
Replenishing compressor oil or Flushing of
compressor :
(a) While reinstalling the Original Compressor
flushing should be done as follows :
1. Drain and measure the refrigerant oil contained in
the compressor.
2. Charge oil through the discharge port of the
compressor with the same amount of new
refrigerant oil.