Troubleshooting Guide

62
3UREOHP 
3RVVLEOH&DXVH 
5HSDLU 
&RPPHQWV 
Water in system
Compressed Air Inlet and
outlet connections are reversed.
Check inlet and outlet
connections.
This dryer is designed for air flow in one
direction
only. Inlet and outlet directions are identified
on
the dryer.
Drain system is clogged
or inoperative.
Restore a free flow of water
condensate. Check water
evacuation.
Drain system is timed solenoid valve,
pneumatically assisted which has to be
adjusted
in accordance with values listed in this
manual.
The Solenoid valve includes a strainer that has to
be
periodically checked and cleaned.
Membranes of pneumatically assisted drain have
to
be checked or replaced every 6 months.
Bypass system is open Check the valves Important: Bypass piping should
be installed
around the dryer so the dryer can be isolated
for
service without shutting down the air
supply.
During dryer operation, valves must be set so all
air
goes into the system. Check tightness
of the bypass system.
Free moisture remains in pipe lines.
Blow out the system
Before the dryer is first started all free moisture
should be blown out of the system.
Excessive air flow
Check actual flow through the
dryer.
This dryer is designed for a maximum air flow.
If too much air is pumped into the dryer, water
removal
capacity may not be sufficient, resultingin
liquid
Carry over downstream. Check the rated flow of
the
air compressor .
Excessive free moisture Check the separator and drain
system and compressor after
cooler ahead of the dryer.
In some system there may be an accumulation of free
moisture in the line ahead of the dryer. If this
moisture
is pumped into the dryer intermittently, the
water
removal capacity may not be sufficient.
A water separator should be installed in the
line
before the dryer.
Excessive compressed
air inlet temperature.
Be sure that dryer is working
lower than design conditions
The dryer is designed to work for calculated design
conditions. Should the conditions be
exceeded,
the dryer will be overflowed, dew point will go
up
and protecting devices can switch off.
Clogged condenser fins Clear fins of all obstructions
The clogged fins in the condenser will restrict
air
passage and reduce refrigerant capacity
causing
water downstream. Fins should be
periodically
checked and cleaned.
Shortage of refrigerant Fix the leak and add a
charge of refrigerant.
Loss of refrigerant will cause improper
functioning.
A qualified, refrigeration specialist should perform
the necessary repairs, or factory should
be
contacted if the unit is in warranty.
Refrigeration system is not functioning
Check to be certain refrigerant
compressor is running
To check if the compressor is running,
check
compressor-on light. lt is possible for the fan to
be
operating but not the compressor.
Compressor not running can be caused by
several
taeters. A qualified refrigeration technician
should
check all refrigerant and electrical controls
Excessive pressure dew point Readjust refrigerant
evaporating pressure
The refrigerant pressure adjustment should
be
done by a qualified refrigeration engineer. This
is
a very sensitiye device and incorrect settings
may
create other failures.
High pressure drop
Excessive compressed
air flow or too law air inlet pressure.
Check actual pressure and
flow through the dryer.
This dryer is designed for a maximum air flow.
If too much air is pumped into the
dryer,
water removal capacity may not be
sufficient,
resulting in l iquid carry-over
downstream.
Check the rated flow of the air
compressor.
Freeze up Check that compressor room
ambient,
Frosting of the Iines is an indication that
controls
are set too low. The following should be done
by
an experienced ref rigeration
technician.
Fan switch could have failed
in closed position keeping fan
on.
Controls may be adjusted in the fields by means of
the hot gas bypass valve. This is to be
done
by a qualified refrigerant technician.
The
unit will not run
or
cycles
off and on.
Clogged heat exchanger
Clean heat exchanger
with areverse air flow.
Dryer are supposed to be used with compressed
air free of any aggressive contaminants.
Some
contamination may require extra maintenance
of
the heat exchanger.
Line disconnect switch is
open.
Close the start or disconnect
switch.
If the dryer is not operating, check the disconnect
switch or circuit breaker to be certain it is
on.
Fuse or breaker is open Replace fuse or reset breaker.
The fuse to the power line should be checked and
replaced if needed. Never replace a burnt
fuse
with an oversized fuse.
Faulty refrigerant
compressor or controls.
Determine the cause and make
correction
Failure of compressor to run may be caused
by
several factors. A qualified refrigeration
specialist
should check all electrical and refrigeration
controls,
or factory should be contacted if unit is in warranty.
Excessive compressed air
inlet temperature.
Design conditions and correction
factors
are described in this
manual.
Be
sure that dryer is working
in
ambient temperatures
below design conditions.
The dryer is designed for working into calculated design
conditions. Should the conditions be
exceeded,
the dryer will be overflowed, dew point will go up
and
protecting devices may trip.