TIAGOR

HVAC

B. 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

C. 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.