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,14.
TROUBLE SHOOTING
PROBLEM
CAUSE
SYMPTOM
REMEDY
A
De\
,-poinl
higher
than expecled
A1
Compressed
air inlet
temperature too
high.
At.1
Dew-point
and
compressed
air
inlet
lemperatures
higher
than
expected;
The
alarm signal relative
lo
lhe
problem
is
displayed
on
the
eleclronic board panel (see noles
2'l
main alarm
relay tripped
(see
noles'l'l
Reduce
the
compressed
air
inlet
lemperature
to
within rated
limits.
A2
Comoressed
air
flow
lm
hioh
pa1
SeAl
1
Reduce
lhe flow of
compressed air
to
A3
Comoressed air
Dressure
too
low.
A3.1
See
Al
1
lncrease the compressed air operating
oressure lo wilhin rated limits.
M
Ak-cooled
dryers:
lemperature loo
hlgh.
ambienl
A4.l
See A1.1
lf the
unit is
installed
indoors,
reduco
the
ambienl
temperature
to
within
rated limits (e.9. install
fans to
extracl
the air)
A5
Water-cooled
dryers: cooling
urater
lemmralure
loo hioh
(low
waler
flowl
As.t
See
41.1
Reduce the
waler
inlel lemperalure
to
within
raled
limits
(e.9. increase the
waler flow)
A5
Air.ffile.l
.ltuars' .lir{v
mndensr
fins
A6.t
S.e
A1
I
Clean the @ndenser Iins.
N
Air-cooled dryers:
front
surface
of
condenser blocked
A7.t
SeeAl
1
Remove obstruciion
from
the
front
surface
of
the condenser.
A8
Air-cooled
dryers
with
three-phase
suoolv:
lhe fan runs backwards
A8.1
See
A1.'l
lnvert the position
of
two phases
of
the
power supply
Ag
(see notes
4')
Waler-cooled
dryers: surface
of
crchander
rims
alirtv
A9.1
See A1.1
Clean
the
surface
of the
pipes
with
a
descaling solulion
thal does
no( reacl
wilh
sleel or
oDrer-
Al0
(see notes
5')
No
refrigerant fluid in circuit
A10.
1
SeeAl
1
comPressor
doesn't stop even if
the air flow is
low;
the
head
of the
refrigerant
compressor
is
very
hot;
ice
formation
on
lhe
evaporator
capillary
inlet;
poner
absorplion
lower
than
exoecled.
Call
in a
qualitied
refrigeralion
engineer
lo
check
for
leaks and
lill
circuil with refrigerant.
B
Excessive compressed
air
pressure
drop.
B1
See
A2
and A3.
Bt.t
Possible increase
in
dew-point
(see
A1.1);
Pressure
downline
from
the
dryer
lorer
lhan
exmcled
lncrease
the
compressed
air
pressure
and flow
to
within raled
limils
82
See
point C.
Befor€ the dryer is completely blocked
by
ice
there is an increase
in
pressure
droo-
B.2.1
See
pcint
C
See poinl
C
B3
Exchanger tubes blocked by impurities
conveyed
by the
compressed
air.
B3.t
Pressure downline
from
the
dryer
loiler
than expecled.
Clean the exchanger pipes with
a
mild
de{ergent
suitable
for
steel
and
copper. lnstall a filter upline from
the
drYer.
c
Dryer blocked and
no
airfloil
C1
(see
notes
7')
lncorecl
position
of
temperature probe
and
as
a
result
the
thermal
mass
temperatur€ reduced
to
below
0'C
(32"F) with oonsequent freezing inside
exchanger tubes.
ct.1
The
velue
rneasured
by the
probe
remains higher than
0'C (32'F)
even
if
lhe
compressor
operates
for
long
periods
(e.9.
more
lhan
1G15
minutes)
without
compressed
air
llowino
Adjusl
the
position of
the
probe in the
colledor
by
pushing
il
in
up
to
the
relati\re
indicator marked on the
probe.
c2
A calibration error or malfundion
in
the
elec{ronic
board,
or a
cfiange
in
the
set
point
(see noles
1')
cause ice to
form-
c2.1
The
compressor
doesn't slop even
il
the dew-point
is
near to
0'C
(32'F).
lncrease the set point
by
1
or 2"C (see
notes
1').
lf
this
doesn't
solve
the
problem,
replace the control board.
c3
lncorrect
calibration
of
temperalure
probe.
c3.1
E\reMhing seems to work propedy
but
the
air
do€sn'l
f,ow.
Use
a
tesler
to
check
the
ohmic
resislance of
the
probe
at 20'C / 68'F
as indicated
in
chapter
9.
lf
neessaru-
reolae
lhe
Drobe-
Dt
The
piping
of the
distribution
line
is
located
in a
cold
environment
(temperatLrre
lo\ryer
than
the
d€w-point
under prBssuro
of
the
compressed air)
and
is not
insulated.
ln
this
case,
condensation
forms
on
the inlemal surfaces
of
the oioino
D1.1
Dryer
runs
normally.
Problems
are
@used
by
external
faclors.
lnsulate
the
Fiping exposed
to
lo\il
ambient lemperalures.
D
Presence
of
condensale
downline
from
dryer.
't7
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