3
for removing the air and water hoses. Also a handle
has been added to help with moving and carrying.
2.5.2 Cleanliness of the water system and the air
filters effect the service life of the compressor, as
does the room temperature where the unit is installed.
The most common reason for compressor repair is a
gradual loss of output capacity, until it will no longer
meet the output air requirement of the dehydrator.
Often, continual service is experienced for several
years before overhaul is needed. Ve r y long periods
of operation without servicing are not destructive.
2.5.3 We caution against the field repair of electric
motors and recommend that if the compressor needs
more work than a simple repair kit installation, it
should be returned to Dielectric for repair.
2.5.4 Repair kits are easy to install when needed
with the compressor removed from the dehydrator.
Both minor and major repair kits contain a compres-
sor installation procedure P/N 100832.
2.5.5 Performance can be fully restored by instal-
lation of a major repair kit. The compressors in all
models use the same major repair kit (P/N 47328).
2.5.6 The minor repair kit (P/N 47325) will correct
leaks from seals and gaskets, but will not totally
restore full output air flow in compressors which
have lost capacity. The minor repair kit fits all the
models addressed in this manual.
2.6 DRY-PAK HEATLESS DRYER
2.6.1 The dehydrator contains a single, DRY-PAK
heatless dryer module. The DRY-PAK dryer has
two filtered, spring loaded desiccant towers. Air is
directed through the towers by two large check balls
which are contained within f r iction-free materials, but
are easily removable for inspection. All manifolding
is internal to the module. The DRY- PAK dryer can
be easily removed or
installed in minutes, without removing other as-
semblies.
2.7 HUMIDITY SENSOR
2.7.1 The humidity sensor is a single chip circuit
that measures both Relative Humidity, and Air
Temperature and signals with a calibrated digital
output. A small sample of dry air from the venting
of system control pressure passes over the sensor.
Its fast response to changes in Relative Humidity
makes it reliable in clearing humidity alarms and
will be much faster compared to the salt sensor
type technology. The sensor boards microprocessor
processes the digital signal and displays % Relative
Humidity and Air Temperature.
2.8 PASSIVE AIR INTAKE
2.8.1 The Passive Air Intake is designed specifically
for use in central office dehydrators. It performs
several helpful functions and has no moving parts,
requires no maintenance or adjustment. The Passive
Air Intake makes it possible to eliminate moving
parts which have historically required additional
maintenance and trouble shooting.
2.8.2 The Passive Air Intake is a nonrestrictive inlet
air muffler and distributes a mixture of inlet air and
purge air to the compressor. It catches the water
splash when the dehydrator shuts down, so no check
valves are needed, and the dehydrator System Pres-
sure is automatically vented each time it stops.
2.8.3 The Passive Air Intake will catch all the splash
from several shutdowns, one after another, but if you
keep turning the dehydrator off and on, some water
will finally run down the side of the canister. No
naturally occurring situation will cause water loss,
and repeated manual intervention will not cause a
catastrophic failure.
2.9 SYSTEM PRESSURE CONTROL
2.9.1 System Pressure control is very important in
any compressor-dehydrator, because it governs the
quantity of air which the dryer must handle. If the
pressure is too high, the output capacity of the de-
hydrator will be reduced and may not be adequate.
If the System Pressure is too low the dryer will be
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