Thermo
King Compressors
The most significant pan of the refrigeration
system is the
compressor lts function ;s
to
pump low pressure gas
out of
the evaporator so that a rapid rnd continuous boiling
action
i. n)rjnll]in(d in rh< e!:rpu':rrur LUil. Thc los
nr(,\ure
gar
rs
cornpressed and forced into the
condenser coil
wh€re
il is
cooled
by air
passing
through the coil. The high
pressure
and rcduced
temperature causes n 10 liquety
(condense).
The conrpr€sso.s covered
by this nunual are reciprocating
piston type pumps,
conslrucled mainly of casr aluminum.
The aluminum alloy
pistons
md casr iron
sleeves ar€
mnchincd to
closc
lolcrances
to that
no
rings are needed lo
fxl Ihr
ti\ron
r,' Ih(
cylind(r
$all
lhe conrpr(\\or is
cquippld
wirh
a high nickel alloy ductile iron crankshafr.
To
prevenl
leakage nround the crankshafi, the
compressor is fit-
ted $ith a rotrry typc rcfrigcrarion seal.
Prcssurized lubrica(ion is
piovidcd
to thc conn€cting rods
.rnd blarinls by a
gcroror
oil
punrp
in the
compr€ssor body.
Thc oil lcvelin
thc
compressorcan
bc inspected thmugh rhe
oil
n\.1
'ithr
gl.\. in the
hod) Srnce rh< r(frip(rJrion sls-
tcm ir scaled. il should be necessrry to
rdd oil only if thcre
hrs bcen r largc .efrigcration
leak in the system. or if a
mnior iten in $c rcftgcration syslem,
such as an evrporr-
ld
coil
or
a condcnsercoil has been replaced.
A spring loaded disch.fg€ valve rnd spring baded valve
crge
providc
pressure relief if liquid reftSerant
enten the
compressor. The entire cage litts nnd
prevems
bre*ing or
deforming ol the
vrlves.
When
any
repairs
or replacements are to be mde on thc
conrpressor. it is
very
i
ponmr
th
the pa s uscd aru
clcan
and nol nicked or scratched. During dis.Nsembly,
pans
should bc clcancd
nnd
;Dspecledi
and if they are to be used
in rcasscmbly.
they should be
wnpped
in a clean cloth to
prcvent
marring the surfaces. Oil .rll pans with
compressor
oil during rssembly,
and be sure they are inslalled in the
snne
posirion
lhcy
were
in bcfore di$ssembly.
NOTE: When rcplaccnent patt
arc
requircd,
wc rccom-
nend using
onq Foctory Apprured Ther o King Rcplaee-
ment Parls. Onlt Gentine Thenno King Replacencnt
Po s deliver the nliabilio,
p.oductirit!, qualitr,
and per-
fon
nncc
yr'rc
co'ne to
erpect
fron
Thcrno
King.
NOTE: Most oI the ot'erhaul prycedures
lor
the conprcs-
so^
covered in this nanual are the sane. Photogruphs of
an
X426
comprcssor are used in thk nanual as examplcs.
Other illustutions arc
pmided
in eascs where the photo-
Cmph
k not applbable.
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