6
Code: 02250129
--
688 SR
--
125 --- SR
--
200
English
6
7 Trouble shooting
The following diagram lists the various problems which may occur during the dryer’s
service life. In the case of serious difficulties however, contact a refrigerant special-
ist.
NOTE
: Always bypass the dryer when it is out of service.
Fan pressure
switch (PV) in-
correctly cali-
brated
Repair
fan
Yes
Yes
Yes
No
No
No
Yes
No
No
Yes
Yes
No
No
No
Yes
Yes
No
Yes
Yes
Yes
No
No
Yes
FAULT
CAUSE
REMEDY
and
high dew
point
High air
outlet
temperature
Thermostat ST
or overload
protector SK
tripped
Compressed
air pressure
too low
Increase air
pressure
Condenser dirty
(cooling
air outlet
too hot)
Clean
condenser
Fan does
not work
Repair
fan
Ambient
temperature
over 122
˚
F
(50
˚
C)
Reduce
temperature
High
refrigerant
discharge
pressure
Compressor
components
perished
Repair or
replace com-
pressor
Seek exter-
nal assis-
tance
Compressor
winding insulation
partially perished
(compressor
too hot)
Low current
consumption
Lack of
refrigerant:
Recharge
Condenser dirty
(cooling
air outlet
too hot)
Clean
condenser
Fan does
not work
Low
evaporation
pressure
Bypass air by keep-
ing air inlet open.
Manually open con-
densate drain. Re-
pair before restarting
(Check hot gas valve
setting)
Excessive
thermal load
(compressor
head too hot)
Reduce
compressed air
quantity or
air
temperature
Compressor
noisy
Excessive
current
consumption
Ice
formation
High refriger-
ant discharge
pressure
No
Yes
Calibrate or
replace
valve
No
Condenser
dirty
Yes
Clean
condenser
Replace
fan
No
Yes
Fan does
not work
