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5
1.
PRE-INSTALLATION
Inspection, Handling and Setup
Inspect the dryer carefully upon arrival and note any
damage on the freight bill. File a notice of concealed
damage if: (1) there are any dents in the cabinet; (2) the air
and drain pipes are not straight; (3) there is any sign of oil
on the skid floor. File these claims with the carrier
immediately!
Cautions and Operating Warnings
*
Never work on unit under air pressure.
*
Never work on unit when power is connected.
*
Do not over pressurize unit.
*
Install unit in a clean, cool (50º - 85º F); well lighted
location.
*
Do not shut unit off at disconnect switch except during
servicing. Unit must be turned on and off by the panel
switch located on the dryer.
*
Do not pass air through the dryer while the dryer is in
the "OFF" position.
*
Do not operate dryer at abnormal conditions (high flow,
high inlet temperature, high ambient, high inlet
pressure, etc.)
2.
DRYER INSTALLATION
Location of Dryer
Unless supplied for special conditions, the air cooled
dryers must be located in an area with an ambient tem-
perature between 50º and 100º F., and free from explosive
and corrosive fumes. High ambient temperatures affect the
outlet dew point of the dryer. For every 10º F of ambient
temperature over 100º F, a decrease of 6% of dryer perfor-
mance is encountered with air cooled dryers. The unit
must not operate in an ambient of over 100º F. For ambient
conditions of over 100º F, water cooled dryers are sug-
gested and are available upon request.
CAUTION – Three feet of space must be allowed between
all open grills and walls or other objects. If the dryer is
installed in a confined area, an exhaust system must be
provided to avoid excessive recirculation of hot room air.
Airline Plumbing
All connections are made to the outside of the cabinet as
follows:
*
Plumbing must be supported independently of the
dryer.
*
If vibration is present, flexible metal hoses must be
installed to prevent it from being transmitted to the
dryer.
*
Use unions or flange joints.
*
Bypass piping around the dryer is recommended for
ease in servicing or removal of unit if necessary.
*
Direction of flow through the dryer must be observed. A
check valve on the outlet of the dryer to prevent back
flow and false loading is recommended.
NOTE: Use two wrenches when connecting to dryer piping
Airtek
4087 Walden Avenue, Lancaster, NY 14086 TEL: (716) 685-4040 FAX: (716) 685-1010 E-MAIL: airtek@airtek.com
so as to prevent damage to internal air or water lines.
Water Line Piping (Water Cooled Units)
On water cooled units, install a strainer ahead of the water
inlet. Dryers are designed for 85º F inlet water tempera-
ture. Higher water temperature reduces dryer capacity.
Minimum water pressure is 25 psi. Maximum water
pressure is 105 psi.
Electrical Connections
Before connecting electrical power to the dryer if appli-
cable (SC/CT40 to 100 have a standard power cord):
*
Check for correct voltage and phase at electrical
connection box.
*
Install a fused disconnect switch near the dryer.
*
Connect power to the stripped leads located in the
electrical connection box or to main lugs of contactor,
whichever is necessary.
(NOTE: All units must be externally grounded to protect
against the possibility of severe electrical shock.)
*
CAUTION: Wire the dryer separately from the air
compressor. The dryer must NOT cycle on and off
with the air compressor.
*
Phase rotation is only important if the dryer has a 3
phase condenser fan. Fans must PULL air through
the condenser coil.
*
Crankcase heaters are pre-wired at the factory to the
line side of the terminal box or contractor. Heaters
must be energized at all times, therefore the main
disconnect must be left on except when servicing the
dryer.
3.
PRINCIPLE OF OPERATION
The AIRTEK REFRIGERATED AIR DRYER is designed to
operate automatically and continuously from no load to full
load without freeze up.
Air System
The major air system components are the air to air
PRECOOLER / REHEATER, the EVAPORATOR, and the
MECHANICAL SEPARATOR.
Hot, wet air enters the inlet of the precooler/reheater
where it is cooled by the outgoing air. The air then enters
the evaporator where it is cooled by the refrigerant causing
the air's humidity to condense into liquid water.
Next the air travels to the separator/coalescer (Note: SC
systems do not have a coalescer). First, the air enters the
separator where bulk oil and moisture are removed from
the air stream through a combination of centrifugal action
and velocity reduction. Then the air enters the coalescer
element where the remaining oil and moisture mists are
removed. After removal from the air stream, all contami-
nants are ejected from the air system by automatic
solenoid or float drains.
From the separator/coalescer, the cold dry air enters the
outgoing side of the precooler/reheater where it is
reheated by the hot incoming air.
The precooler/reheater serves a triple purpose. By
precooling the incoming air, it conserves refrigeration use
and by reheating the outgoing air, it serves to eliminate
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