Section 10
DRYER MAINTENANCE
AND TROUBLESHOOTING
39
10.1 GENERAL
As you proceed in reading this section, it will be
easytoseethatMaintenanceProgramforthedryer
is quite minimal. The use of service indicators will
alert you when service maintenance is required.
Checks on the dryer on a regular basis will help in-
sure that all items are functioning properly.
10.2 ROUTINE MAINTENANCE
Check automatic condensate traps on a regular
basis to insure that they are operating properly or
the emulsion will back up into the compressed air
system. Proper drain trap and valve maintenance
is the owners responsibility and is not covered by
the warranty.
The condenser fins may need to be periodically
cleanedtoremovedust,lint,etc.,toassureefficient
heattransfer. Highheadpressureoravisualcheck
will determine the need for cleaning.
Check the gauge readings periodically for good
system operation.
10.3 TROUBLESHOOTING INTRODUCTION (DRY-
ER)
Beforeworkingon t herefrigerant s ystem, readthe
Safety Section 1.3 pertaining to pressure.
The dryer consists of three basic systems: Air, Re-
frigerant,andElectrical. Anairleakat100psig(6.9
bar) will provide an audible signal indicating where
there is a problem; R---22 has no color or odor,
therefore a small refrigerant leak is difficult to find.
However,itcanbedetectedbyabubbletest,halide
torch (with a flame which changes from red---
orange to blue on contact with refrigerant) or an
electrical detector.
The electrical system consists of transformers,
starters, sw itches, relays, etc. The use of a volt---
ohm meter or similar equipment is required for
checking continuity, amperage and voltage.
10.4 TROUBLESHOOTING--DRYER
SYMPTOM PROBABLE CAUSE REMEDY
UNIT DOES NO T RUN No Line Voltage Follow wiring diagram and check voltage from
compressor terminal to the power source to find
where the circuit was interrupted.
Insp ect electrical components such as switches,
controls, motors, transformers, etc.
The supply p ower voltage, frequency and phase
must coincide with unit’s nameplate.
Improperly Wired Check wiring against wiring diagram and tighten
any loose connection.
Breaker Fuse or Tripped Circuit Checkforamperagedrawofunit.
Breaker
HEAD PRESSURE TOO HIGH Refrigerant Overcharge Excessrefrigerant;checkunit’snameplatefor total
system refrig erant charge.
Refrigerant overcharge may cause system not to
perform properly and efficiently.
Condenser Fouled and Dirty Dismantle and clean condenser.
Clogged fins in air---cooled condenser will reduce
heat transfer efficiently. Finsshouldbeperiodically
checked and cleaned.
Defective Fan C ontrol Switch Fan control cuts in at 215 psig (14.8 bar) and cuts
out at 170 psig (11.7 bar). Replace.
Defective F an Motor Replace.
Dryer Location Too Hot Cool ambient or relocate the unit (see Section 4.2
(high ambient) Mounting of Integral Compressor/Dryer).
Compressed Air Leaks to Refrigerant Evacuate,repairleakandrechargewithrefrigerant.
System.
Repair or replace evaporator.
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