Wilkerson WRA-0010, WRA-0015, WRA-0025, WRA-0035 Owner's/operator's Manual
READ ALL INFORMATION IN THIS MANUAL BEFORE
BEGINNING INSTALLATION OR OPERATION OF THE DRYER.
BEFORE STARTING INSTALLATION AND/OR MAINTENANCE
PROCEDURES, TURN OFF THE MAIN POWER TO THE DRYER
AND COMPLETELY DEPRESSURIZE THE UNIT TO PREVENT
PERSONAL INJURY.
DO NOT REMOVE, REPAIR, OR REPLACE ANY ITEM ON THIS
DRYER WHILE IT IS UNDER PRESSURE.
THIS DRYER USES REFRIGERANT R-22. COMPLY WITH ALL
LOCAL, STATE, AND FEDERAL REGULATIONS CONCERNING
REFRIGERANT WHEN PERFORMING ANY MAINTENANCE OR
SERVICE ON THE REFRIGERATION SYSTEM. ALL
REFRIGERATION SYSTEM REPAIRS OR MAINTENANCE NOT
DETAILED IN THIS MANUAL SHOULD BE DONE BY A
QUALIFIED REPAIR PERSON.
NEVER OPERATE THIS DRYER ABOVE THE RATED OPERATING
CONDITIONS. OPERATION ABOVE SPECIFIED CONDITIONS
WILL RESULT IN DECREASED PERFORMANCE, POSSIBLE
DAMAGE TO THE UNIT AND/OR PERSONAL INJURY.
®
WARNING
For further assistance contact:
P.O. Box 1237
1201 W. Mansfield Ave.
Englewood, CO 80150
Phone (303) 761-7601
FAX (303) 783-2300
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WILKERSON CORPORATION
REGISTERED TO ISO 9001
CERTIFICATE NO. A2192
FM21121
83-267-000-FL, REV. C • 08/02 • Printed in the U.S.A.
OWNER/OPERATOR MANUAL
COMPONENTS, INSTALLATION, OPERATION
AND SERVICE INSTRUCTIONS
REFRIGERATED COMPRESSED AIR DRYER
WRA-0010 — WRA-0035
Table of Contents
Why you need a Wilkerson Dryer And Recommended Typical Installation ................Page 2
Dryer Dimensions And Recommended Wilkerson Accessories...................................Page 3
Installation Instructions....................................................................................................Page 4
System Panel And Parts List............................................................................................Page 5
Cabinet Components ........................................................................................................Page 6
Refrigeration Components...............................................................................................Page 7
Electrical Components......................................................................................................Page 8
Wiring Diagrams...........................................................................................................Page 9-11
Trouble Shooting Guide..................................................................................................Page 14
Warranty...........................................................................................................................Page 15
Return Policy ...................................................................................................................Page 16
Service Information.........................................................................................................Page 17
WILKERSON Page 1
WHY YOU NEED A WILKERSON
REFRIGERATED AIR DRYER
Untreated compressed air will contain contaminants
such as water, compressor oil, rust, chemical contaminants, and bacterial growth.
All of these contaminants will cause corrosion and
product contamination.
With proper filtration and a Wilkerson refrigerated air
dryer, in used contaminants will be reduced to a harmless level.
The end result will be that the equipment which comes
in contact with dry, treated, compressed air will stay
cleaner, will not corrode, and will last longer.
FIGURE 1: TYPICAL COMPRESSOR ROOM LAYOUT:
COMPRESSOR
*COALESCING FILTERS RECOMMENDED FOR OIL FREE AND ODOR FREE AIR
RECOMMENDED INSTALLATION SHOULD INCLUDE AFTERCOOLER, SEPARATOR AND FILTRATION FOR GOOD
QUALITY COMPRESSED AIR.
AFTERCOOLER
SEPARATOR
REFRIGERATED
AIR DRYER
PRE-
FILTER
OPTIONAL
COALESCING*
FILTERS
WILKERSON Page 3
Dryer Full Prefilter Recommended Recommended
Model Inlet/Outlet Flow Type A Prefilter Type B Afterfilter Type C Weights
Number Connections (
SCFM) 5.0 Micron 0.5-1.0 Micron 0.01 Micron lbs
WRA-0010
1
/4" NPT 10 F18-02-SG00 M18-02-BG00 M18-02-CG00 53
WRA-0015
1
/4" NPT 15 F18-02-SG00 M18-02-BG00 M18-02-CG00 75
WRA-0025
1
/2" NPT 25 F18-04-SG00 M18-04-BG00 M18-04-CG00 75
WRA-0035
1
/2" NPT 35 F18-04-SG00 M18-04-BG00 M18-04-CG00 75
DIMENSIONS
NOTE: Recommended filters were selected on the basis of flow capacity—not pipe size.
INSTALLATION
Air-Cooled Condenser (Standard)
The dryer should be installed in a well-ventilated area.
Ambient air should flow freely into the condenser
opening (right side of dryer). Do not block or restrict this
opening. There should be at least 12" (305 mm)
clearance at the back and both sides of the dryer. The
condenser fins and surfaces should be regularly
cleaned with an air blow gun. The grill can easily be removed to access the condenser coil.
Ambient temperature should never be above 110°F
(43°C) or below 40°F (4.4°C).
Compressed Air Piping
Pipe air “in” and “out” as indicated on dryer. Compressor
induced vibration (or any other vibration) should be
dampened by installing flexible piping between the dryer
and compressor, or vibration dampeners on dryer floor
legs. Prolonged vibration will damage dryer and void
warranty. If piping incorporates a bypass circuit
(recommended), make sure “in” and “out” shut-off
valves are normally wide open and bypass valve
completely closed. Do not undersize these valves.
Care Of Outside Of Dryer
This dryer is protected and decorated with the highest
quality paint for lasting attractive appearance. To clean
these surfaces, use a sponge, mild soap and warm
water. Dry with a clean cloth. Do not use any abra-
sives or solvents.
System Monitor
1. Dryer “Power on” on/off light illuminates to indicate
power is on to the dryer.
2. Optional Refrigerant Suction Gauge displays dryer
suction pressure.
3. High temperature warning light indicates the
compressor is not running.
Before Start-Up
The gauge readings
BEFORE START UP will be:
1.
REFRIGERANT SUCTION PRESSURE: Indicates the
refrigerant pressure and during shut down corresponds
with the ambient temperature (see page 5 for
temperature-pressure chart and convert ambient
temperature to pressure reading for R-22).
Example: 70° F ambient, R-22 pressure is approximately 121.4 psig.
Start-Up
DO NOT START WITH A LOAD ON THE DRYER
Bypass the flow of air around the dryer before pushing
the start button.
1. After pushing the start button, the power indicating
light will illuminate. Dryer is designed to run continuously and must not be cycled with the air compressor.
The fan on air-cooled units will cycle in accordance with
head pressure.
2. The refrigerant suction pressure gauge readings
AFTER START UP AND WHILE OPERATING UNDER
RATED LOAD will be: R-22 (57-65 PSIG).
Page 4 WILKERSON
WILKERSON Page 5
Control Panel and Components Voltage Part #
1 ON/OFF Switch 115 V 87-379-000
230 V 87-379-001
2 High Temperature Light 115 V 87-382-000
230 V 87-382-001
3 Refrigerant Gauge — 49-082-000
RUNNING OPERATION
1. The non-cycling operation of the refrigerated dryer is
controlled by an automatic expansion valve (AXV). The
fan control is used in conjunction to maintain head
pressure during light or no load running condition.
2. The automatic expansion valve is preset at the factory.
The suction pressure gauge should indicate 65
PSIG for
R-22. If adjustment is necessary refer to Figure 1.
AXV USED AS EITHER AN EXPANSION VALVE OR
AS A HOT GAS BY-PASS.
INCREASING THE
SUCTION PRESSURE WILL RAISE THE
EVAPORATOR TEMPERATURE.
DECREASING THE SUCTION PRESSURE WILL
LOWER THE EVAPORATOR TEMPERATURE.
Temperature-Pressure Chart (R-22)
TEMPERATURE PRESSURE
F PSIG
28 52.4
30 54.9
32 57.5
34 60.1
36 62.8
38 65.6
40 68.5
45 76.0
adjusting screw
Use a 3/8" wrench or socket to turn the adjusting screw.
Turn clockwise to increase the suction pressure. Turn
counterclockwise to decrease the suction pressure to the
normal range.
INCREASE
DECREASE
FIGURE 1
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