HVAC 38 iv. FLUSHING OF AC SYSTEM Whenever there is an AC compressor failure the AC system should be flushed. This is done in order to remove the debris of the AC compressor that might have circulated through the system. The compressor used is piston type compressor. Flushing can be either done using an inverted decanting R134a cylinder filled with refrigerant. In some recovering devices a flushing port is provided. NOTE If a compressor is replaced without flushing, debris would circulate throughout the system. Hence all the components should be flushed 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 fitments will be required as AC 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 approximately the same amount which was left in each part. 4. Reverse flush the components. 5. Do not flush through a compressor otherwise possible internal damage could occur. 6. Recycle the refrigerant recovered during flushing; the recovery device will remove contaminants through a filtration system. ! CAUTION Be sure to use specified compressor oil only. v. REPLENISHING COMPRESSOR OIL (a) While re-installing the Original Compressor 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. NOTE If the amount of oil in the original compressor was not checked, then approximately 70±10 ml. of new oil should be added to the compressor being installed. (This is assuming the compressor being installed has first been drained). (b) While installing a New Compressor A new compressor (1) comes with a certain amount of oil (A) sealed in it. When replacing the old compressor (2) with a new one; an amount of oil (C) as calculated below should be drained from the new compressor. “C” = “A” -“B” “C” = Amount of oil to be drained “A” = Amount of oil sealed in a new compressor “B” = Amount of oil remaining in old compressor (2) NOTE As it is necessary to replenish oil by approximately the same amount, which is remaining in old compressor, draining of additional oil from the New Compressor becomes necessary.
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