background image

9

3.14 

The Eff ects of Unwanted Vapor and Automatic Gas Ballast

 

Systems which contain undesirable vapors cause diffi

  culty both from the standpoint of attaining 

desirable ultimate pressures. A vapor is defi ned as the gaseous form of any substance which is 
usually a liquid or a solid. Water, oil, and mercury vapors are three of the more common vapors 
encountered in typical vacuum systems. When such vapors exist in a system, the vapors or 
mixtures of gas and vapors are subject to condensation within the pump; the precipitated liquid 
may thus ultimately solidify on the PTFE heads and diaphragm causing corrosion.

 

The 2070 pump is equipped with automatic gas ballast valve to prevent vapor condensation 
in the pump. Every unit has gas ballast ON by factory setting. The gas ballast ON is indicated 
by blinking RAMP UP lights. The gas ballast valve is closed when three RAMP UP lights stop 
blinking and they are steady.

 

To disable gas ballast feature, press and hold power button until you hear two beeps, break 
and three beeps. The RAMP UP light will turn ON steady. 

 

To enable gas ballast feature, press and hold power button until you hear two beeps, break 
and three beeps. The RAMP UP lights will start blinking.

3.15  Shutdown Procedures
 

After use, Welch recommends the pump be run for about 2 minutes disconnected from the 
vacuum process. The air pumped through the mechanism will purge out water vapor or 
droplets of condensate that may have formed on the inside of the pump. This purge of the 
pump mechanism helps prevent build up of solute crystals inside of the pump head. Over time, 
these crystals will shorten pump lifetime.

3.16  User Interface
 

Power ON/OFF Function – To power-on or power-off  the unit when in normal power mode the 
power button must be pressed for one half second and released.

 

Enable Power Mode feature – Power Mode feature ensures that the unit will automatically 
start-up after any AC power interruption. To enable the power mode feature press and hold 
the power button until two beeps are heard. Immediately release the power button. The Power 
Mode LED turns on. The unit will now automatically power-up when AC power is supplied to 
the unit.

 

Disable Power Mode feature – To disable the power mode feature press and hold the power 
button until two beeps are heard. Immediately release the power button. The Power Mode LED 
turns off .

Summary of Contents for Welch Chemstar Dry 2070

Page 1: ...efore using the pump See Section 2 15 CAUTION Do not pump liquids with the pump Pumping liquids will cause the pump to stop working CAUTION CAUTION Using flexible PVC vacuum hose or silicone rubber vacuum hose with organic solvents such as Methylene Chloride DCM may leach out plasticizers and foul pump internals causing mechanism failure ...

Page 2: ...ions are found where failure to observe the instruction could result in damage to the equipment associated equipment and process These units conform to the SI International system of units of measurement The following symbols with recommendation of IEC1010 of warning will be found on the pump Caution Refer to accompanying documents Caution Risk of electrical shock Caution Hot surface WARNING Motor...

Page 3: ...ions 7 2 16 Electrical power 7 2 17 Chemical Compatibility of Vacuum Hose 7 Section 03 Operation 3 10 Starting the Chemstar Dry 8 3 11 Cleanliness 8 3 12 Leak detection 8 3 13 Operating pressure range 8 3 14 The effects of unwanted vapor and automatic gas ballast 9 3 15 Shutdown procedure 9 3 16 User interface 9 3 17 Fault modes 10 Section 04 Specifications 4 10 Specification chart 11 4 20 Performanc...

Page 4: ...ways disconnect power source before servicing 1 15 Never drop or insert fingers or any other object into any openings 1 16 Do not operate this product where oxygen is being administered 1 17 Wear safety glasses and goggles when operating this product 1 18 Use only in well ventilated areas The motor on all pumps are totally enclosed fan cooled WARNING Do not operate the pumps in an atmosphere contai...

Page 5: ...iquid Unplug immediately 1 33 Never operate this product outdoors in the rain or in a wet area 1 40 Danger To Reduce Risk of Explosion or Fire 1 41 Do not use this pump in or near explosive atmospheres or where aerosol spray products are being used 1 42 Do not use this product near flames WARNING Failure to observe the above safety precautions could result in Severe bodily injury including death in...

Page 6: ...h your dealer or Welch Vacuum be sure to include your order numbers for quick identification Do not return the pump to the factory without obtaining returned goods authorization See Service Support on www welchvacuum com 2 13 System Mounting Rubber feet are attached to the bottom of the pump Rubber feet are excellent for applications involving a semi flexible surface such as a bench top they help to...

Page 7: ...16 1 Power Source Review Review the power source and the motor rating to be sure they agree in voltage phase and frequency Serious damage may occur to the motor if it is connected to an improper voltage All Welch pumps must be grounded Grounding reduces the risk of electric shock in the event of an electrical short circuit The plug must be plugged into an outlet properly grounded Consult your loca...

Page 8: ...mping on organic solvent vapors Solvent such as Methylene Chloride DCM effectively leaches out plasticizers from the PVC and silicone hose which carry over to the vacuum pump causing contamination and vacuum mechanism failure Using natural thick walled gum rubber vacuum hose gives better resistance to organic solvents such as Methylene Chloride DCM and protects vacuum pump against early failure Use...

Page 9: ...gas ballast feature press and hold power button until you hear two beeps break and three beeps The RAMP UP lights will start blinking 3 15 Shutdown Procedures After use Welch recommends the pump be run for about 2 minutes disconnected from the vacuum process The air pumped through the mechanism will purge out water vapor or droplets of condensate that may have formed on the inside of the pump This...

Page 10: ...purge the pump 4 When the blower has finished its ramp down the second RAMP LED will go out and now the last RAMP LED will flash in unison with POWER ON LED The total time from this point to the unit fully powering down will be 95 seconds 5 After ten seconds the Vent valve will open 6 Fifteen seconds before the unit powers down the blower is shut off along with the last RAMP LED Power down sequence c...

Page 11: ...5 Weight lbs Kg 50 22 7 88 40 Running Amps 3 6 Free Air Displacement Diaphragm Pump LPM 35 120 Overall Dimensions Lx W x H in cm 18 1 x 8 5 x 18 4 45 9 x 21 6 x 46 7 22 5 x 10 5 x 17 8 57 2 x 26 7 x 45 2 Ordering Information Wired for 115V 60Hz 1 Ph with North American plug 2070B 01 2080B 01 Wired for 230V 50 60 Hz 1 Ph supplied with Schuko and UK cord sets 2070C 02 2080C 02 Note 2070C 02 Fuse Rep...

Page 12: ...70 0 1 1 10 100 1000 0 50 100 150 200 250 300 350 400 450 500 Pressure Torr Time sec Pumpdown on 41 L tank CHEMSTAR DRY Models 10 100 1000 0 01 0 1 1 10 100 1000 Flow Lpm Vacuum pressure Torr Pumping Speed CHEMSTAR DRY Models Model 2080 Model 2070 ...

Page 13: ...SCREW PAN HEAD 8 32 2 6 SCREW 8 X 1 2 SELF DRILLING 22 23 CABLE CLAMP 3 7 HOSE CLAMP 2 24 NAMEPLATE 2 38 X 2 00 1 8 BUMPER RUBBER 31 32 4 25 LABEL 0 75 X 0 75 WHITE MYLAR 4 9 LABEL CLEAR COAT 3 25 X 2 25 1 26 OVERLAMINATE 1 10 WIRE ASSEMBLY CONTROL TO CONTROLLER 1 27 LABEL FRONT PANEL 1 11 WIRE ASSEMBLY SOLENOID 1 28 LABEL GENERAL DANGER 1 12 WIRE ASSEMBLY SOLENOID 1 29 SHROUD ASSEMBLY 1 13 WIRE A...

Page 14: ... TO 604813 WHITE WIRE CONNECTS TO L TERMINAL BLACK WIRE CONNECTS TO N TERMINAL CONNECT 604817 HERE OTHER END CONNECTS TO 604813 BLACK WIRE CONNECTS TO V RED WIRE CONNECTS TO V CONNECT 604819 HERE OTHER END CONNECTS TO 51 4014 SOLENOID VALVE CONNECT 604818 HERE OTHER END CONNECTS TO 604811 CONNECT 605435 HERE RED WIRE FROM 639560 BLOWER FAN CONNECTS TO TERMINAL 1 ON 605435 CONNECT 605435 HERE ED WI...

Page 15: ...pumps that have been used for any period however short will be repaired under this warranty rather than replaced The warranty is effective for one year from the date of original purchase when 1 The warranty card has been completed and returned 2 The product is returned to the factory or other designated service centers freight prepaid 3 The product in our judgment is defective through no action or ...

Page 16: ...e 550 Mount Prospect IL 60056 Phone 847 676 8800 Technical Support Fax 847 677 8606 E Mail gdwelchvacuum gardnerdenver com Web Page www welchvacuum com Copyright 2020 Gardner Denver Welch Vacuum Technology Inc Welch is registered trademarks of Gardner Denver ...

Reviews: