6
tank without any restriction. Inside the separator
tank, centrifugal action and large surface impinge-
ment separate the water from the air stream without
significant pressure change.
3.3 Warm water flows from the base of the tank to
the large water filter where any entrained solids are
removed. The filtered water passes through the air
cooled heat exchangers and is cooled to near ambi-
ent temperature. The termperature is monitored
by a Thermister. The cooled filtered water flows
unrestricted to the water metering orifice and again
into the compressors. The water travels the entire
route in about one minute.
3.4 Moist, pressurized air flows from the top of the
water separator tank to the DRY- PAK dryer inlet
check ball. The check ball is attracted to the open
purge valve (left or right) selected by the cycle timer
(which is part of the sensor board control).
3.5 The moisture content of the process air is re-
duced to a dew point of -40
0
F. (-40
0
C.) or lower, as it
moves upward through the desiccant tower opposite
the open purge valve. Any entrained water droplets
drain into the purge valve fitting below the desiccant
tower. The surplus moisture is retained tempor arily
in the desiccant.
3.6 A metered flow of dry purge air passes downward
through the desiccant tower (the desiccant tower
which has an open purge valve), picks up the moisture
retained there in the previous cycle and carries it back
to the Passive Air Intake. The surplus moisture is
added to the water in the system when the purge air
is again compressed (together with ambient air) and
it flows to the water separator tank. The desiccant
tower selection is reversed every thirty seconds of
operation by the cycle timer.
3.7 The addition of surplus moisture to the water in
the separator tank causes the water level in the sight
tube to raise the water ejector float switch. This ac-
tion in turn causes the water ejector solenoid valve to
open and expel the surplus water through the water
drain fitting on the rear of the cabinet.
3.8 Dry air flows from the heatless dryer outlet to
the System Controller, which has a single pressure
adjust ment. The System Controller main tains the
System Pressure, and also performs as both a Bypass
Val ve and a Humidity Shut Off Valve. The Bypass
Air Muffler is located directly behind the body
of the System Controller. The System Controller
Regulator is adjustable and controls the pressure
to the system controller. Ven ting dry air from the
regulator controlled by a small fixed orifice is passed
across the humidity sensor to measure the systems
relative humidity. The system pressure is measured
with a pressure sensor located on the Sensor Control
Board.
3.9 The dry air flows next to the factory set flow
valve that has a differential pressure sensor connected
across it. The sensor located on the sensor board,
measures the pressure and displays the corresponding
flow in SCFD based on the calibration and Dryer
size. The dry air is then fed to both the High Pres-
sure Outlet and The Line Pressure Regulator. The
output of the Flow Valve also supplies the System
Flow Valve, which is used when adjusting the System
Pressure Regulator. The Line Pressure Regulator
adjustment controls the pressure which flows to the
Low Pressure Outlet. The air flowing to the Low
Pressure Outlet is monitored by a line pressure sensor
located on the sensor board. High and Low Pressure
Alarms are set in the Setup Menu.
4.0 RECEIVING AND INSPECTION
4.1 You have the responsibility to inform the carrier
of any shipping damage and to initiate any damage
claims. Do not accept containers showing obvious
damage.
4.2 Immediately upon receipt, remove the air dryer
from the shipping container. Thoroughly inspect the
air dryer and file a claim against the carrier for any
hidden damage.
5.0 LOCATION CONSIDERATIONS AND
RECOMMENDATIONS
5.1 All electrical wiring must be in accordance with
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