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OPERATING MANUAL

VACUUM/PRESSURE STATION

MODEL NO. 420-3901 (115V AC)

MODEL NO. 420-3902 (230V AC)

A-1299-5105

Edition 05

Thermo Fisher Scientific

1-800-637-3739 (U.S. and Canada only) 
11 (847) 381-7050 (Outside U.S.) • (847) 381-7050 (Local)
www.thermoscientific.com • [email protected]

Summary of Contents for 420-3901

Page 1: ... MODEL NO 420 3901 115V AC MODEL NO 420 3902 230V AC A 1299 5105 Edition 05 Thermo Fisher Scientific 1 800 637 3739 U S and Canada only 11 847 381 7050 Outside U S 847 381 7050 Local www thermoscientific com fluidhandling thermoscientific com ...

Page 2: ...2 ...

Page 3: ...NTENANCE 11 REPLACEMENT PARTS LIST 14 PUMP HEAD REPLACEMENT PARTS LIST 14 SPECIAL APPLICATIONS 14 NOTE 14 WARRANTY 15 PRODUCT RETURN 15 TECHNICAL ASSISTANCE 15 VALOX Reg TM General Electric Co DACRON Reg TM E I DuPont de Nemours and Co Trademarks bearing the symbol in this publication are registered in the U S and in other countries 3 ...

Page 4: ... operation is started WARNING Gas under pressure should not be used for supply as a hazardous bursting condition could develop in the Pump Head Use only gases contained at atmospheric pressure CAUTION Do not operate pump when pressure ports of both heads are in a blocked condition CAUTION Do not use metal fittings with any Air Cadet Pump 4 ...

Page 5: ...lied with the unit and the 115V AC motor is a U L recognized component Figure 1 shows the typical flow characteristics of the 115V station as related to pressure and vacuum The corresponding flow data for the 230V station are 5 6 of the values shown in Figure 1 Also note that even though model 420 3902 is designed for 50 Hz applications it can be run on 230V AC 60 Hz line current In this condition...

Page 6: ...d In the event of an electrical short circuit grounding reduces the risk of electric shock by providing an escape wire for the electric current This product is equipped with a cord having a grounding wire with an appropriate grounding plug The plug must be plugged into an outlet that is properly installed and grounded in accordance with all local codes and ordinances DANGER Improper use of groundi...

Page 7: ... volt 50 cycle circuit for Model 420 3902 Model 420 3901 has a grounding plug that looks like the adapter illustrated in Figure 2 A A tem porary adapter which looks like the adapter illustrated in Figure 2 B and C may be used to connect this plug to a 2 pole receptacle as shown in Figure 2 B if a properly grounded outlet is not available The temporary adapter should be used only until a properly g...

Page 8: ...let port marked FOR VACUUM WARNING Gas under pressure should not be used for supply as a haz ardous bursting condition could develop in the pump head Use only gases contained at atmospheric pressure CAUTION Do not operate pump when pressure ports of both heads are in a blocked condition To draw a regulated vacuum from a source first connect the source of supply to the port marked INPUT OUTPUT and ...

Page 9: ... VACUUM PRESSURE STATION When the pump is not in use store in a clean dry area If ports on pump are open cover to keep dust and dirt from entering Wipe power cord down with dry towel and inspect for cracks in insulation after each use Have cord repaired if found defective prior to reusing ...

Page 10: ... Max Pressure 18 21 psig 18 21 psig Max Suction 23 Inches Hg 23 Inches Hg Housing Dimensions 9 in L x 8 in W x 8 75 in H 9 in L x 8 in W x 8 75 in H Air capacity will depend on the application Refer to Figure 1 It indicates the approximate flow with various input and output conditions Recommended Pressure 18 psig Max continuous duty 21 psig Max intermittent duty Recommended Vacuum 23 in Hg continu...

Page 11: ...d before any cleaning operation is started For diaphragm replacement disassemble top part of the Pump Head Then unscrew the diaphragm and install the new diaphragm Reassemble the Pump Head It is good practice to replace the Pump Head when the diaphragm is replaced This ensures new clean valves and maximum per formance Dirty valves will reduce performance Do not disassemble the pump housing from th...

Page 12: ...lve the spring goes back in first followed by the ball and the adjustment screw and in the PRESSURE ADJUST valve the ball must go in before the spring HELPFUL HINTS 1 If it is necessary to draw a vacuum or pressurize two lines simultane ously the plastic pipe plug in the AUXILIARY port can be replaced by any tube fitting with a standard 1 4 NPT male pipe thread on one end Be sure however to use a ...

Page 13: ...13 VALVE BODY VALVE BODY BALL BALL SPRING SPRING O RING O RING ADJUSTMENT SCREW ADJUSTMENT SCREW PRESSURE REGULATION VALVE VACUUM REGULATION VALVE FIGURE 4 ...

Page 14: ...Kit Eccentric Assembly 7530 75 Service Kit Pump Head Assembly 7530 77 Service Kit Housing 7530 78 Service Kit Diaphragm Shaft 7530 79 Service Kit Cover Bottom 7530 83 SPECIAL APPLICATIONS Technical information and advice concerning the use of this product in spe cific applications may be obtained from our Engineering Department If vol ume justifies modifications can be made to adapt the unit to sp...

Page 15: ...or modification or b post expiration dated materials THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER AND THE MANUFACTURER AND DISTRIBUTOR DISCLAIM ALL OTHER WARRANTIES WHETHER EXPRESS IMPLIED OR STATUTORY INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE NO EMPLOYEE AGENT OR REPRESENTA TIVE OF THE MANUFACTURER OR DISTRIBUTOR IS AUTHORIZED TO BIN...

Page 16: ...16 Thermo Fisher Scientific 1 800 637 3739 U S and Canada only 11 847 381 7050 Outside U S 847 381 7050 Local www thermoscientific com fluidhandling thermoscientific com Printed in U S A ...

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