Gardner Denver Welch Chemstar Dry 2070 User manual

OWNER’S MANUAL FOR
CHEMSTAR®DRY
MODELS: 2070, 2080
Part No. 642979
Printed in USA
WARNING
Be sure to properly identify intake and exhaust before 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.

INSTRUCTION
WARNING AND CAUTION
PLEASE READ BEFORE OPERATION
While reading your manual, please pay close attention to areas labeled:
WARNING AND CAUTION.
The description of each is found below.
WARNING
Warnings are given where failure to observe instruction could result in
injury or death to people.
CAUTION
Cautions 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 includes a self resetting thermal cutout and the pump could restart
without actuation under fault condition.
2

TABLE OF CONTENTS
Section Page
Section 01 - Safety Information
1.10 Caution: to prevent injury 4
1.20 Caution: to reduce risk of electrical shock 4
1.30 Warning: to reduce risk of electrocution 5
1.40 Warning: to reduce risk of explosion or fire 5
Section 02 - Installation
2.10 Environmental conditions 6
2.11 Introduction 6
2.12 Unpacking 6
2.13 System mounting 6
2.14 Pump location 6
2.15 Discharge provisions 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 Performance charts 12
Section 05 - Drawings
5.10 Exploded view 13
5.20 Dimensional drawing 14
5.30 System electronic boards 14
Section 06 - Maintenance and Repair
6.10 General maintenance 15
Section 07 - Warranty 15
3

4
Section 1: SAFETY INFORMATION
1.10 Caution: To Prevent Injury...
1.11 Never operate this product if it has a damaged cord or plug. If it is not working properly, has
been dropped, damaged or has fallen into water, replace the cord of same type and rating.
1.12 Keep the cord away from heated surfaces. All electrical products generate heat. To avoid
serious burns never touch unit during or immediately after operation.
1.13 Never block any air openings or place it on a soft surface where the openings may be blocked.
To ensure proper ventilation, keep unit a minimum of one inch from any wall or obstruction.
The air openings are for ventilation of the motor inside the housing.
1.14 Models 2070 and 2080 are thermally protected and can automatically restart when the
protector resets. Always 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 containing flammable or
explosive gases/vapors
1.19 Be sure to properly identify intake and discharge before using pump. See Section 2.5.
Models 2070 and 2080 have one exhaust port on the pump. See Section 2.15.
WARNING
Remove plug from Exhaust Port before using
1.20 Caution: To Reduce Risk Of Electrical Shock...
1.21 Do not disassemble. Disassembly or attempted repairs if accomplished incorrectly can create
electrical shock hazard. Refer servicing to qualified service agencies only.
1.22 Unit is supplied with a three pronged plug. Be sure to connect pump to a properly grounded
outlet only.

5
1.30 Warning: To Reduce Risk of Electrocution...
1.31 Do not use this product in or near area where it can fall or be pulled into water or other liquids.
1.32 Do not reach for this product if it has fallen into liquid. 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 •ames.
WARNING
Failure to observe the above safety precautions could result in Severe
bodily injury, including death in some cases

6
Section 2: INSTALLATION
2.10 Environmental Conditions
The Pump is rated for indoor use only. Maximum altitude 2000 meters. Operating temperature
range 10oC to 40oC.
2.11 Introduction
Intended use of the proprietary oil-less vacuum system consisting of a vacuum blower in
combination with a PTFE diaphragm pump providing deep dry vacuum for chemical resistant
applications.
This manual has been compiled not only for the care and maintenance of the Chemstar Dry
now in your possession, but as a helpful reference and guide to prevent many problems which
can occur if used improperly.
2.12 Unpacking
Carefully remove the Chemstar Dry from the shipping case. Handles are provided on the lower
front and back of the unit to assist in carrying, lifting and removing from the carton. Preserve
all paperwork for future reference. If damage has occurred from shipment a claim must be
filed with the carrier immediately; preserve the shipping carton for inspection by the carrier. If
you are required to communicate with 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-•exible surface such as a bench top; they help to isolate noise and eliminate
creeping. The Chemstar Dry system must be positioned with feet on a •at horizontal surface.
2.14 Pump Location
WARNING
Don’t operate this pump in an atmosphere containing •ammable or
explosive gas
WARNING
The motor is thermally protected and will automatically restart
unexpectedly when the overload device resets
The Chemstar Dry should be located preferably in a clean, dry and well ventilated area.
Please be sure not to block the ventilation ports located on the motor housing. The pump
should be placed where the surrounding temperature remains between 10oC and 40oC (50oF
and 104oF). Always check to insure the location chosen is protected from direct or indirect
moisture contact. The pump should be located as closely to its system in order to utilize it most
e!ciently.

7
2.15 Discharge Provisions
Chemstar Dry intake and exhaust fittings are NW25 with a 3/8-18 NPT threaded ID. All
systems come with one hose barb which is supplied loose. The hose barb accepts 3/8” ID.
hose. By threading the hose barb in the exhaust port of the pump, a vent line can be attached
which allows gases and vapors pumped through the system to be piped from the work area
into a hood. Vent lines will muffle noise coming from the vacuum pump.
WARNING
Never block the discharge port. If the exhaust is blocked, pressure will
build-up in the pump which can lead to the pump head bursting creating
the potential of serious injury. Remove plug from exhaust port.
WARNING
Remove plug from exhaust port before operating
Properly identify the intake and exhaust of the pump
Intake
Exhaust
2.16 Electrical Power
2.16.1 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 local electrical codes if you have doubts.
Identi•cation Symbols: Power O! / Power On
2.17 Chemical Compatibility of Vacuum Hose
Do not use "exible PVC hose or silicone rubber hose for vacuum connections when pumping
on organic solvent vapors. Solvent such as Methylene Chloride (DCM) e!ectively leaches
out plasticizers, etc., 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.

8
Section 3: OPERATION
3.10 Starting
Before attaching the pump to a system it is well to familiarize yourself with the function
and action of the pressure vacuum pump which you have acquired. Review the power
requirements as described in Section 2.16. Welch recommends running the pump for a few
minutes to warm it up before use. The warm-up improves the pumps ability to pass water and
organic vapor. A warm pump will handle more vapor without liquefying it than a cold pump.
3.11 Cleanliness
Take every precaution to prevent foreign particulates, liquid and harmful vapors from entering
the pump. Ingestion of particulates and liquid can damage the pump. A simple trap can be
made out of a •ltering •ask placed between the pump and the vacuum chamber. The use of
a cold trap is also recommended to maintain e•cient vacuum performance and for removing
harmful condensable vapors.
Do not use •exible PVC hose or silicone rubber hose for vacuum connections when pumping
on organic solvent vapors. Solvent such as Methylene Chloride (DCM) e•ectively 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 of a cold trap recommended on applications with high vapor loads such as;
• Flash Evaporation
• Concentrators
• Processing Natural Plant Extracted Oils
.
To system intake
Chemstar Dry
3.12 Leak Detection
Eliminating all leaks in a vacuum system is a key to obtaining maximum vacuum. The pump
must remove this added volume of leaked gas to maintain the desired vacuum. Leaks can be
located by slightly pressuring the system and painting the suspected area with a thick soap
solution. Escaping air will produce soap bubbles.
3.13 Operating Pressure Range
Vacuum pumps are designed to be run from slightly below atmospheric to their maximum
vacuum level on the intake side. Consult the Speci•cation Table in the back of this manual for
the ratings for your speci•c model.

9
3.14 The Effects of Unwanted Vapor and Automatic Gas Ballast
Systems which contain undesirable vapors cause difficulty both from the standpoint of attaining
desirable ultimate pressures. A vapor is defined 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.

10
Power-down sequence.
1. Press Power button to start power-down sequence.
2. The MAX VAC LED and third RAMP LED will go off and the blower will begin a ramp down
to a fixed RPM matching the pumping speed of the diaphragm pumps. The POWER ON and
second RAMP LED’s will flash in unison indicating the shutdown mode is in progress.
3. Ten seconds after the start of power-down sequence the VENT valve will open to 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 continue.
7. Ten seconds later the diaphragm pumps are turned off
8. Five seconds later the VENT valve is closed and unit power is off.
3.17 Fault Modes. Call factory in case of fault condition. Phone [phone]

11
Section 4: SPECIFICATION
4.10 Speci•cation Chart
Model 2070 2080
Maximum Flow LPM (m3/hr) @ 50 or 60Hz 150 (9) @ 2 torr 300 (18) @ 2 torr
Flow @1Torr(1.33 mbar), LPM (m3/hr) 140 (8.4) 286 (17.2)
Ultimate Vacuum Pressure, torr (mbar) 0.05 (0.07) 0.05 (0.07)
Inlet / Outlet Connection NW25 NW25
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 Replacement. Replace only with 250Vac, 3A, 5x20mm, Qty 2, non-time Delay.

12
4.20 Performance Charts
Model 2080
Model 2070
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

13
Section 5: DRAWINGS
5.10 Exploded View
141016
4
25
28
21
31
24
6
26
3
17
15
30
8
9
1
29
22
33
23
34
2
13
32
27
11
12
19
7
20
18
5
ITEM NO. DESCRIPTION QTY. ITEM NO. DESCRIPTION QTY.
1 NUT HEX #10-32 X 3/8” X 1/8” 8 18 FITTING NW25 X 3/8” NPT 1
2 WASHER BRASS FLAT #10 8 19 TUBE GAS BALLAST 1
3 SLEEVING 1/2” ID X 15” 1 20 FITTING REDUCER 3/8” X 1/4” 1
4 HANDLE 2 21 FITTING ADAPTER NW25 1
5 O-RING 017 1 22 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 ASSEMBLY KEYPAD 1 30 COVER BASE 1
14 GROMMET 2 31 COVER ASSEMBLY TOP 1
15 BASE ASSEMBLY PUMP 1 32 COVER FRONT PANEL 1
16 BASE ASSEMBLY BLOWER 1 33 COVER HANDLE 1
17 TUBE 18” 1 34 FRONT COVER ASSEMBLY 1

5.20 Dimensional Drawing
This Kit is a one Head Service Kit
5.30 System Electronic Boards
CONNECT 600418 HERE
USE CONNECTOR 605397
CONNECT 600418 HERE
USE CONNECTOR 605409
CONNECT 604818 HERE
OTHER END CONNECTS
TO 604812
CONNECT 604823 HERE
OTHER END CONNECTS
TO 604813
CONNECT RED WIRE TO +V
CONNECT BLACK WIRE TO -V
CONNECT 604826 HERE
OTHER END CONNECTS TO 659072
CONNECT 604814 HERE
OTHER END CONNECTS TO 51-4221
BLACK WIRE CONNECTS TO UNMARKED TERMINAL
WHITE WIRE CONNECTS TO "N"
CONNECT 668531 DIAPHRAGM
PUMP ASSEMBLY HERE
CONNECT 604816 HERE
OTHER END CONNECTS 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 WIRE FROM 639560
PUMP FAN CONNECTS
TO TERMINAL 1 ON 605435
CONNECT WHITE WIRE
FROM 604816
CONNECT BLACK WIRE
FROM 604816
CONNECT RED WIRE
FROM 604817
CONNECT BLACK WIRE
FROM 604817
CONNECT 604825 HERE
OTHER END CONNECTS
TO GROUND STUD ON BASE
CONNECT RED WIRE
FROM 604823
CONNECT BLACK WIRE
FROM 604823
604812
604811
604813
L
L
N
N
GND
GND
-V
-V
+V
+V
14
DC Power Supply

15
Section 6: MAINTENANCE AND REPAIR
6.10 General Maintenance. Call factory, Phone [phone].
Section 7: WARRANTY
UNPACKING
Inspect the pump carefully. If any damage has occurred, •le claim with the carrier immediately.
Save the shipping container for carrier to inspect.
OPERATING PUMP
Refer to the enclosed Instruction/Operation Manual for all information to properly operate and
maintain the pump.
WARRANTY
This Welch Vacuum product is warranted to be free from defects in material and workmanship.
The liability of Welch-Ilmvac under this warranty is limited to servicing, adjusting, repairing
or replacing any unit or component part which in the judgment of Welch-Ilmvac has not
been misused, abused or altered in any way causing impaired performance or rendering
it inoperative. No other warranties are expressed or implied. The method of executing this
warranty: servicing, adjusting, repairing or replacing shall be at the discretion of Welch-Ilmvac.
Vacuum 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 fault of the user.
If the product has become defective through misuse, abuse, or alteration, repairs will be billed
regardless of the age of the product. In this event, an estimate of the repair costs will be submitted
and authorization of these charges will be required before the product is repaired and returned.
To obtain a return authorization number, please fill in the on-line request form on www.welchvacuum.
com. Products without a return authorization number will be refused by our receiving department.
Before shipping, properly pack the pump, insure it against loss or damage, and on the outside of the
pump packaging and the packing slip write in the return authorization number. Pumps damaged due
to improper packaging are the customer’s responsibility.

Welch Vacuum by Ingersoll Rand
1601 Feehanville Drive, Ste 550
Mount Prospect, IL 60056
Phone: [phone] (Technical Support)
Fax: [phone]
E-Mail: [e-mail]
Web-Page: www.welchvacuum.com
Copyright©2020 Gardner Denver Welch Vacuum Technology, Inc.
Welch is registered trademarks of Gardner Denver