WELCH-ILMVAC OWNER’S MANUAL FOR SELF-CLEANING DRY VACUUM SYSTEM™ MODELS: 2025, 2026, 2027 & 2028 2025 2027 2028 (9 Torr, 12 mbar) (2 Torr, 2.7 mbar) (2 Torr, 2.7 mbar) 2026 (2 Torr, 2.7 mbar) Improved to better meet your laboratory needs.
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.
TABLE OF CONTENTS SECTIONS PAGE Section 01 - Safety Information 1.10 To Prevent Injury 1.20 To Reduce Risk of Electrical Shock 1.30 To Reduce Risk of Electrocution 1.40 To Reduce Risk of Explosion or Fire 04 04 04 04 Section 02 - Installation 2.10 Introduction 2.20 Electrical Power 2.30 Traps 05 06 07 Section 03 - Component, System and Unit Operations 3.10 Component Description 3.20 Control Locations 3.30 Vacuum Gauge / System Control Function 3.40 Vacuum Level Regulation 3.50 Gas Ballast Valve 3.
Section 1: SAFETY INFORMATION 1.10 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, please return the product to a Gardner Denver Welch Vacuum Technology service center for examination and repair. 1.12 Keep the cord away from the heated surfaces. 1.13 Never block any air openings or place it on a soft surface where the openings may be blocked.
Section 2: INSTALLATION 2.10 Introduction This manual has been compiled not only for the care and maintenance of the Welch Dry Vacuum System now in your possession, but as a helpful reference and guide to prevent many problems which can occur if used improperly. 2.11 Unpacking Carefully remove the Dry Vacuum System from the shipping carton. Preserve all paperwork for future reference.
PROPERLY IDENTIFY THE INLET AND OUTLET OF THE PUMP Outlet Port Inlet Port (Model 2028 shown) WARNING: Remove Plug From Exhaust Port Before Operating. 2.20 Electrical Power 2.21 Power Source Review Review the power source and the voltage rating on the units serial number tag to be sure they agree in voltage, phase and frequency. Serious damage may occur to the system if it is connected to an improper voltage. All Welch systems must be grounded.
The temporary adapter should be used only until a properly grounded outlet (Sketch A) can be installed by a qualified electrician. When using the temporary adapter, the green colored rigid ear, lug, etc. extending from the adapter must be connected to a permanent ground such as a properly grounded outlet box cover. Whenever the adapter is used, it must be held in place by a metal screw. 2.
2.34 Cold Trap Solvent Removal Condensation of organic solvent fumes is typically accomplished by suspending a trap in a Dewar flask containing dry ice / isopropanol slurry or liquid nitrogen. Alternatively low maintenance cooling to -100oC can be achieved using a refrigerated cold trap. The cold trap is connected between the application and the pump unit to prevent solvent ingestion.
Section 3: COMPONENTS, SYSTEM AND UNIT OPERATION 3.10 Components - 3.20 Control Locations - 3.21 Control Locations for Models 2025, 2026 and 2027 - 3.22 Control Locations for Model 2028 - 3.30 Vacuum Gauge / System Function - 3.31 Vacuum Gauges for Models 2025 and 2026 - 3.32 Vacuum Gauge / System Control Function for Model 2027 - 3.33 Vacuum Gauge / System Control Function for Model 2028 - 3.40 Vacuum Level Regulation - 3.50 Gas Ballast - 3.60 Rapid Response Vacuum Adjustment - 3.
3.30 Vacuum Gauges / System Control Functions 3.31 Analog Vacuum Gauge for Models 2025 and 2026 A dial vacuum gauge is incorporated in the vacuum system 2025 and 2026. The dial gauge is located in the top front section of the system. The dial vacuum gauge is commonly used to indicate vacuum level when operating in the rough vacuum range (2 torr, 2.7mbar, 29.8 in Hg). Dial vacuum gauges give negative pressure - That is pressure below atmospheric. The reference point for the gauges is atmospheric pressure.
Change Cleaning Time To change cleaning time, select through the MENU SCREEN: SETUP > SET CLEANING TIME. Select Cleaning Time To set cleaning time, chose the appropriate time from the SELECT CLEAN TIME SCREEN; default value is 120 seconds. Use longer clean times to purge low-volatility solvents. Unit Software Information To retrieve information about the unit, select through the MENU SCREEN: ABOUT. Model / Software Version / Contact are displayed as shown in this Figure.
3.33 Vacuum Gauge / System Control Function for Model 2028 A digital vacuum gauge is incorporated into the model 2028 vacuum system. The digital gauge is an absolute gauge located in the top front section of the Self-Cleaning system. The unit of measurement is preset during production. VENT MODE Press VENT button to enter VENT mode Note: the gauge will not display atmospheric pressure. The pump will automatically go into vent mode when the pump is turned on.
MAXIMUM VACUUM MODE Press MAXIMUM VACUUM button to enter MAXIMUM VACUUM mode MAXIMUM VACUUM mode closes the valve and sets the pump to the maximum vacuum level. To adjust the vacuum level in MAXIMUM VACUUM mode you can press the MANUAL mode button and use Vacuum Control knob to open/close the variable valve (see manual mode) or press the Anti-BUMPING/FOAMING button to decrease the vacuum level by several torr.
- 2) PROGRAM Selecting the Program option allows the end user to select from one of five stored programs, enter a new program or edit an existing one. Use the Vacuum Control knob to scroll to the Program option and press to enter the Program menu screen. The Program screen displays all existing stored programs in desired vacuum units and time (minutes). Use the Vacuum Control knob to scroll up and down and press the Vacuum Control knob to enter your selection.
SETUP MODE Press SETUP to access all program functions 1) Set Units 2) Set Cleaning Time 3) Auto Shutdown 4) Back 5) Exit Use the Vacuum Control knob to scroll through all the MENU options. Push the Vacuum Control knob to select a highlighted MENU option - 1) SET UNITS Use the Vacuum Control knob to select the Set Units option to change displayed units from torr, mbar, and kPa. The Selecting Units screen will appear and display the current units setting with an asterisk.
3.40 Vacuum Level Regulation Vacuum level regulation is accomplished with an adjustable bleed valve. The adjustable bleed valve allows close control of pressure in your apparatus. Pressure may be set between roughly atmospheric pressure and the maximum obtainable vacuum (2 torr, 2.7mbar, 29.8 in Hg). 3.
3.70 Inlet and Outlet Separators (all Models) The glass inlet separator helps protect the diaphragm pump inside the system from ingesting liquids or particulates. The outlet separator catches any liquid or particulates ejected while the pump is running and when its is operating in the self-cleaning purge cycle. See Section 2.30 for more information about trapping. WARNING Always wear safety gloves that are designed for handling glass when removing the inlet or/and exhaust jars.
Section 4: MAINTENANCE 4.10 General Maintenance Welch dry vacuum units are 100% oil-free. The pump employs a diaphragm with uninterrupted PTFE coating. No maintenance is necessary for the bearings. All bearings are sealed and permanently lubricated. Lubrication should not be attempted. Welch’s Recommendation: To extend the service life of the diaphragm membrane, turn off the Self-Cleaning Dry Vacuum System when not in use.
Step 4: Use the Vent button to select Calibrate Sensor (menu item 1). When Calibrate Sensor is selected press the power button. The unit will now go into calibration mode with Calibrate ATM in the bottom line of the display and 750 in the main line. Step 5: Use the VENT button to change the display so that the correct atmospheric pressure is displayed. Each press of the Vent button will increment the display by one. When the display reaches 800 it will go to 700 and start going up again.
Section 6: TROUBLESHOOTING 6.10 Vacuum Problems Leakage, contamination and unusual out gassing are the general causes of problems associated with poor vacuum. To operate at maximum efficiency a system must be thoroughly clean. If the system is completely clean and free from leaks, and unwarrantable vacuum problems still exist, the pump should be checked. A simple criterion for checking the condition of the pump is the determination of its maximum vacuum capability.
Insufficient Vacuum Problem • Possible Cause External connection leak • • Gas Ballast is On • Switch Gas Ballast to OFF position • Vacuum Control is not Closed • Closed Vacuum control (CW) • Jar “Intake Side” is not tightened in place • Use Rubber Wrench to tighten jar • Check vacuum pump pressure with external vacuum gauge, attached to pump inlet fitting • If external vacuum gauge pressure is the same as unit’s display, problem is with faulty pump or external connection leaks (mechanical
Digital gauge Possible Cause Solution • Motor failure • Change Motor • Broken diaphragm – Con-rod connection • Change Diaphragm and/or Con-Rod • Poor readings • • See section 2.25.1 Analog Vacuum Gauge Check vacuum performance - See Poor Vacuum section above • Gauge not responding • Remove housing cover - check connections and ensure hose is not kinked. If hose is loose or kinked, reattach or straighten. If problem persists, verify vacuum with independent vacuum gauge.
Section 7: SPECIFICATION 7.10 Specification Table Welch Model Free Air Displacement CFM (L/min) @ 60 Hz m3/hr (L/min) @ 60 Hz Vacuum Level, in Hg Ultimate Pressure, Torr (mbar) Motor Horsepower (watts) Bump/Anti-Foam Button Tubing needed, I.D. in (mm) Intake / Exhaust Thread NPT Weight, lbs (Kg) Programmable Repeat Function Store Programs Timer Overall Dimensions L in. (cm) W in. (cm) H in. (cm) Shipping Weight, lbs (kg) Catalog Number Wired for 115V, 60Hz, 1 Ph with N.
Section 8: DRAWINGS, PARTS LISTS AND EXPLODED VIEWS 8.10 Dimensional Drawing 11.83" 300mm 13.86" 352mm 4.76" 121mm 10.16" 258mm 0.70" 18mm 5.50" 140mm 11.30" 287mm 6.10" 155mm 11.29" 287mm 2.75" 70mm 8.11 Schematic Wiring Diagram for Models 2025 & 2026 24 9.
8.12 Schematic Wiring Diagram for Model 2027 8.
8.14 Parts List & Exploded View for Dry Vacuum System ITEM 1 2 3 4 5 6 7 8 8 9 10 Note: QTY 4 2 0.35 Ft 1.60 Ft 1.30 Ft 1 1 1 1 2 2 PART NUMBER See Note 1 See Note 1 See Note 1 See Note 1 See Note 1 See Note 1 See Note 1 726123 726125 1423B 1415B DESCRIPTION Hose Clamp 5/16" Hose Clamp 1/8" Tubing, Fluoroelastomer Tubing, Blended Tubing, PTFE Duality Gasket U-Clamp Vacuum Gauge 2" Dial (mbar / kPa) Vacuum Gauge 2" Dial (in Hg / cm hg) Glass Jarr Assembly Replacement Glass Jarr 1.
8.15 Parts List & Exploded View for Repair Kits Repair Kit 2037K-01 (for Models: 2025) This kit provides enough parts to service one side/head of this vacuum pump. Repair Kit 2047K-01 (For Model: 2026, 2027 & 2028) This kit provides enough parts to service one side/head of this vacuum pump.
Section 9: WARRANTY IMPORTANT Please Read Carefully Before Operating This Welch® Vacuum Pump UNPACKING Inspect the pump carefully. If any damage has occurred, immediately file 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.
Welch-Ilmvac 5621 W. Howard Street Niles, IL 60714 Phone: (847) 676-8800 (Technical Support) Fax: (847) 677-8606 E-Mail: gdwelchvacuum@gardnerdenver.com Web-Page: www.welchvacuum.com Copyright© 1997-2007 Gardner Denver Welch Vacuum Technology, Inc.
