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4
Diophrogm
Push Pins
Thermol
Bulb
diophrogm
to
regulote
the
Freon flow;
super heot
spring
pressure,
evoporotor
pressure,
ond
thermol
bulb
pressure.
The super heot
pressure
spring
is
constont ogoinst
the
diophrogm
to
re-
duce
the
orifice
opening.
The evoporotor
pressure
olso
re-
duces
the ori{lce opening.
Thermol
bulb
pressure
ogoinst
the
diophrogm opens
or
increoses
the
orifice
opening.
The
thermol
bulb is
chorged
with
Freon-12
in
o
liquid ond
gos stote ond
is
connected
to
the diophrogm
in
the
exponsion
volve. The
pressure
in
the
thermol
bulb
will
vory with
tempero-
ture. The
bulb is
clomped
to
the
suc-
tion
line odiocent
to
the
evoporotor
outlet,
thus sensing
the temperoture of
the
suction
line.
The suction
line
lem-
peroture
is
controlled
by the
quontity
of
refrigeront in the evoporotor.
If
the
suction line temperoture
increoses,
ther-
mol bulb
pressure
will
increose
over-
coming
the
effects
of
the super
hecrt
ond
evoporotor
pressUr€s;
on
increose
in
Freon
flow into the
evoporotor
will
resu
lt.
lf
the
suction
line
temperoture
de-
creoses,
thermol
bulb
pressure
de-
creoses,
ond
the super heot
spring
ond
evoporotor
pressures
will
reduce
the
orifice opening; thus less Freon
will
flow
into the evoporotor.
Some
of
the
heot
in
the
oir
being di-
rected
through
the
evoporotor
is
ob-
sorbed
by the
Freon.
The
Freon
is
boiled os
it
obsorbs
the heot ond
the
heot is retoined
in the
Freon
vopor.
lt
is this heot which
is
removed
by
the
cooling oction
of
the
condenser,
ihot
chonges
the voporized
Freon
bock
into
FIGURE
l2 -
Sectionol View
of
Exponsion
Vol',,e
ALL
SEASON AIR
CONDITIONING
Diophrogm
lnlet
(High
Pressure)
Stroiner
Screen
Super Heot Spring
Outlet ([ow
Pressure)
liquid
for
reuse.
Two
pressures
ore
present
in the
sys-
tem;
low
pressure
from the
exponsion
volve
to the
suction
side
of
the
com-
pressor;
high
pressure
from
the
dis-
chorge
side
of
the
compressor
to
the
inlel
side
of
the exponsion volve.
Hereofler
the
pressures
will be
re-
ferred
to
os
"low
side"
or
suction
pres-
sure
ond "high side"
or
heod
pressure.
The thermostot
control hos
o
tem-
peroture
sensing
copillory
tube.
When
the
evoporotor temperoture is
lowered
to
the
thermostot
control setting
the
thermostot opens
the
circuit
to
the
compressor clutch. The mognetic
clutch
is de-energized
stopping
the
refrigero-
tion
cycle.
The
temperoture
of
the
evqporotor roises
to
the
thermostot
setting ond the control
closes
the
mog-
netic clutch circuit
ond
refrigerotion
ogoin
occurs.
SERVICE
INFORMATION
Correct Hondling
of
Freon
Sofety
glosses
should
be
worn
to
protect
the
eyes
becouse
Freon-l
2
boils
ot
-
21
.7oF
ond moy
freeze
oreos where it
contocts
-
Treot oflected
oreos
{or
frostbite.
Flush
the
offected
oreos
with
cold woter.
Alwoys instoll
the
protective cop
on
the
Freon
drum
to
protect
the
volve
ond
sofety plug.
Never
corry
o
Freon
drum
in
the
possenger
comportment.
Never leove
the
drum
exposed
to
the
sun
or
high temperotures.
Never
overfill
o
Freon
drum,
illl
75
per
cent
of
the
drum copocity
thus ol-
lowing
for
exponsion.
Never
heol
lhe drum
with
o
torch,
slove,
or
radiotor,
fo
increose
lhe
pressure
in
the drum
for
chorging,
immerse
the drum
rn
o
confoiner
of
worm
woler
no
htgher
thon
1250.
Never
use
o
torch,
weld,
solder, or
steom cleon
on
or
neor
o
system
un-
less
the
Freon
hos been
completely
dischorged ond
evocuoted.
Never inhole lorge quontities
of
Freon-'l
2
vopors,
it
octs
os
on
ones-
thetic.
Never dischorge o
system
in on
oreo
where
on open flome
exists.
Freon-,l2
when
combined
wiih on
open
flome
produces
o
very toxic
gos. The vopor
olso oflects
bright
metol
surfoces.
Moisture ond
Air
Moisture
ond
oir in
the
system
is
hormful.
Use
core
to
prevent
moisture
loden
oir
f
rom entering the
system.
Woter is not
miscible
with
Freon-l2
therefore,
it will
freeze
ond
block
the
openings in the exponsion volve.
Chemicolly,
woter ond
Freon-'l2
re-
oct
to
form
hydrochloric
or
hydro-
fluoric ocid which corrode
the
metol
ports
in
the
system.
Woter
emulsifles
lubricoting
oils
forming o
sludge
which
reduces
system
lubricotion.
lmmediotely seol
oll
lines
ond
com-
ponents
during
repoirs
to
prevent
the
entronce
of
woter. Cops
ond
plugs
should be
used
to
close
oll
fitting
open-
ings in lines,
hoses,
ond
components.
NOIE, As
a
furlher
precctution,
2
c.c.
of
mefhono/
per pound
of
Freon-\Z
is
used
lo
prevenl
mois-
lure from
ireezing
in
lhe
sysfem.
Hondling
of
Lines
It
is
extremely imporfont thot
the
re-
frigeront
lines
by kept dry ond
cleon.
Whenever
o
connection is
to be
bro-
ken,
cleon
oll dirt
ond
greose
from
the
con
nection.
Ports
from
stock
ore copped ond
de-
hydroted; the
cops
should be
removed
only prior
to
instollotion.
Lines removed
{rom
the
system
to be
used
ogoin
should
be
copped immediotely
to
pre-
vent
dirt ond
moisture
from
entering
the Iine. If
cops
ore not ovoiloble,
cop-
per
lines
con
be
ploced
in on
oven for
o
period
of two or
three
hours before
o_-
S_1
s
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