ceneral Compressor
Repair Techniques
(Rev.
7. 1zo1)
BLACK OlL.
Indicates carbonizrtion caused by air in the
systcm or the
presence
of
wear panicles
that contrin
iron.
ChaDgc thc
compressoroil and oil filter.
LIGHT BROWN OIL. Us€ an acid test ki110 lest rhe acidity
of a
srmple ofthe compressor oil. For alkyl benzine oil use
acid tesl
kit P/N 20:l-346. For
polyol
ester oil use acid test
kil P/N
l0.l
518.
Change thc compressor oil ifthe test indi-
cntcs the oil is acidic.
BROWN OIL. Indicates copper
plating
cruscd
by moisture
in the systcm. Air in lhe systen or high compressor tenp€r-
atures can
causc oxidrtion which will
(um
the oil brown.
Change the compressor oil
if lhe test indicrtes the oil is
CRAY OR
METALLIC OIL.lndicares the
presence
ofwear
panicles
thar conrain aluminurn.
This
is usurlly caused by
bcaring wcar or
piston
sconng. Th€ compressor should be
disassembled and insp€cled tbr
wom
or damaged compo-
nenls. Thc
oil
and
oil fikcr should be changed.
CREEN
.)lL.
Crc(n
(omprcssor
oil indiLrte\ th.re ir
sJrer
in thc system and copper
plating
mry have orcuned. The
compressor should be disass€mbled and the
shati seal. beaF
ings, gcrrs. md rotors should be insp€cred. Pans
with
sig-
nificanr coppcr
plaring should be replrced. the oil separator
should bc rcplaced. and
the oil md oil fiker should bc
A contarninated system
will
cause a
failurc if lefi uncor-
rected- The contaminate in the syslem
{ill
break down
ihe
refrigerant oil, causing excessive
bearing wear and sconng
of
pans within
the compressor
Copperphdng and moisture
will
affect the
valve plale
rings and break down
thc rcftger-
anl and rffecls the capacity oflhe unit.
Panicles and bearing scale traveling
with thc rcfrigerant
will
plug
the driers and expansion
valves.
causing eratic
opcration until the condition is coffected. nushing
with
refrig€ranl or th€ use of
suclion filters and liquid line driers
is rcconmended whenever a contaminated system is found.
In some cases. lhe conhminaled condilion can be conecl€d
by changing oil.
refrigerant
and
drier Usc r recommended
evacuation
process
before th€ unil is
placed in servicc. Scc
TK 40229 Clean-up of Refrigeration Systcms
with Thermo
King Compressors.
'
To Next Page
Loading...
