Labconco 48, 60, and 72 Hoods

Transcription

1 Labconco 48, 60, and 72 Hoods PROTECTOR LABORATORY HOODS INSTRUCTION MANUAL Model Nos. Remote Blower Integral Blower Style Style Product designs are subject to change without notice 1998 Labconco Corporation Part Number Revision S / ECO A800 Printed in U.S.A.

2 TABLE OF CONTENTS Unpacking Instructions 4 Introduction General Description 5 Hood Performance 6 Air Flow Diagrams 7 Component Identification 8-9 (Remote Blower Hood) Component Identification (Integral Blower Hood) Installation 12 Installation Factors 13 Service Fixture Connection 14 Sash Weight Release 15 Normal Operation 16 Sealing Laboratory Hood 17 Exhaust Connection 18 (Integral Blower Hood) Auxiliary-Air Connection 19 Auxiliary-Air Chamber 19 Front Panel Assembly without Auxiliary Air 20 Exhaust Connection Remote Blower Hoods 20 Routine Maintenance 21 Performance Testing 22 Electrical Connection 23 Replacement Parts Remote Blower Hoods 24 Replacement Parts Diagram 25 (Remote Blower Hoods) Integral Blower Hoods 26 Replacement Parts Diagram 27 (Integral Blower Hoods) Wiring Diagram Dimensional Drawing 31 Warranty 32 Shipping Claims 33 Contacting Labconco 34 3

3 UNPACKING INSTRUCTIONS Once the outer hood carton and inner pack materials have been removed, the Protector Hood should be retained on its shipping pallet until time for installation. This will prevent damage to the bottom side of the hood. When the hood is removed from its shipping pallet it should be carefully lifted without using the airfoil and set on the floor. This will then allow access to the hood sash weight, which has been shipped attached to the shipping pallet inside the hood by two lag bolts. WARNING: Remove hood sash weight from shipping pallet, prior to disposing of pallet and set aside. The hood can now be placed into its final working location. Additional installation instructions for electrical, plumbing, and HVAC connections are highlighted in this manual for your reference. To attach the sash weight to the hood, proceed as follows: 1. Remove the right side panel on the hood by pushing up on the side panel until the tabs on top of the side panel clear their respective mounting slots, then remove and set aside. 2. Remove the two plastic banding strips that hold the sash in a closed position. WARNING: Until the sash weight is installed, the sash itself is not counterbalanced and will fall to the closed position, should it be raised. 3. Check the sash cables for proper alignment on their respective pulleys. Make sure the cable retainers are aligned properly on each cable before trying to operate the sash. 4. Connect the clip on the end of each sash cable to the corresponding clip on each side of the sash weight box. Raise the sash to check for smooth operation and weight travel interference WARNING: A minimum of a 1-1/2" opening must be left above the fume hood. This will allow you the ability to remove either the hood auxiliary air bonnet, front panel or side panel for internal service. This spacing is also critical for the passage of air to allow the by-pass on the hoods to function properly. 4

4 INTRODUCTION General Description Your Labconco laboratory fume hood has been designed to efficiently ventilate toxic, noxious, and/or otherwise harmful materials from your work area. To do this, the fume hood must be provided with an air sufficient to extract contaminants within the hood and keep them away from the operator to avoid ingestion, inhalation or skin contact. The room air and outside air (if an auxiliary-air model) are drawn through the hood sash opening to generate the desired air flow volume for your specific operation. With its bright, one-piece working area, molded from glass fiber reinforced polyester resin, the hood is easy to clean and chemically resistant to most substances, thus assuring you many years of service. 5

5 INTRODUCTION Hood Performance The Labconco laboratory hood has been designed to allow you the maximum in work area and personnel safety. The remote blower hoods are available in both by-pass and auxiliary-air configurations and the integral blower hoods are available only in the by-pass configuration. The by-pass hood configuration as shown in the drawing on the following page is dependent totally on air supplied to the hood from its surrounding environment. The auxiliary-air style hood on the other had has been designed for locations that are unable to supply enough air for the hood to function properly. It combines room air with outside air, introduced through the auxiliary-air plenum of the hood. Up to 70% of the total exhaust volume of the hood may be provided by the auxiliary-air system. Normally a maximum of 50% auxiliary is used with these fume hoods. The auxiliary air is ducted into the auxiliary-air chamber of the hood and then distributed through the diffusers uniformly across the sash opening of the hood. So that, it can mix evenly with the room air being pulled into the hood. One must be certain that when using a by-pass style hood that your building facility is capable of supplying 100% of the air that is required for normal operation of the hood. If your building supply air system is unable to supply this volume of air, you will not be able to maintain the face velocity requirements on your fume hood that are required for safe operation. 6

6 INTRODUCTION Integral Blower Hood - Air Flow Diagrams 7

7 INTRODUCTION Component Identification (Remote Blower Hood) 1. Sash Foil Assembly. The sash foil assembly is located directly below the sash opening on the hood. The aerodynamic shape of the sash foil directs a smooth flow of air into the hood cavity with a minimum of turbulence. The sash foil forms part of the by-pass feature for the hood by allowing air to pass under the sash foil as the sash is lowered to a working position. The foil assembly is not easily removed, but should this occur it will alter the stated performance and containment values for the hood. 2. Tamper Proof Baffle. The tamper proof baffle has been shaped to develop a uniform face velocity pattern across the sash opening of the hood. Because the baffle has been set to maintain a uniform face velocity pattern for most material applications, it is not adjustable. 3. Exhaust Connection. The hood features a molded exhaust connection sized to allow for a minimum of static pressure loss through the hood structure and still provide a good transport velocity through the exhaust system. A condensation control ring is also molded into this connection. 4. Tempered Safety Glass. A vertical rising, tempered safety glass sash assembly allows the hood user the flexibility of arranging the sash at a position suitable for various procedures inside the hood. 5. Fluorescent Light Fixture. The hood interior is illuminated by dual fluorescent lights that are located outside of the hood interior to provide a non-glare working environment. Explosionproof lighting (incandescent) is also available on specific models of the hood. 6. *Auxiliary-Air Feature. (Optional) The auxiliary-air system provides the hood with up to 70% of the total air volume required for normal operation of the hood. The auxiliary air, which is supplied from the exterior of the building or from other sections of the building, reduces the demand placed on the room air supply by the hood. The primary reason for the auxiliary-air system is to allow the hood to operate properly by overcoming an inadequate supply of room air. 7. Factory Installed Service Fixtures. (Optional) Located on both the left and right panels are remotely controlled fixtures, which can be used for numerous supply services. They can be used regardless of the sash position as they are controlled from outside of the fume cavity. *Not shown on diagram 8

8 INTRODUCTION 8. Electrical Receptacles. One 115 volt duplex receptacle has been placed on the front of the hood structure to allow for the use of electrical equipment inside of the laboratory hood NOTE: Electrical Receptacles are not supplied on the explosion proof models of this hood. 9. Front Panel. Color coordinated panel is easily removed for lamp replacement and access to the electrical supply connections for the hood. 10. Fiberglass Reinforced Polyester Liner. One piece molded fiberglass liner features curved interior corners for easy cleaning. Bright interior white surface reflects light without glare. The liner exceeds all national codes for fire resistance, as well as being chemically resistant to most substances. 9

9 INTRODUCTION Component Identification (Integral Blower Hood) 1. Sash Foil Assembly. The sash foil assembly is located directly below the sash opening on of the hood. The aerodynamic shape of the sash foil directs a smooth flow of air into the hood cavity with a minimum of turbulence. The sash foil forms part of the by-pass feature for the hood allowing air to pass under the sash foil as the sash is lowered to a working position. The foil assembly is not easily removed, but should this occur, it will alter the stated performance and containment values for the hood. 2. Tamper Proof Baffle. The tamper proof baffle has been shaped to develop a uniform face velocity pattern across the sash opening of the hood. Because the baffle has been set to maintain a uniform face velocity pattern for most material applications, it is not adjustable. 3. Exhaust Connection. The hood features a molded exhaust connection sized to allow for a minimum of static pressure loss through the hood structure and still provide a good transport velocity through the exhaust system. A condensation control ring is also molded into this connection. 4. Tempered Safety Glass. A vertical rising, tempered safety glass sash assembly allows the hood user the flexibility of arranging the sash at a position suitable for various procedures inside the hood. 5. Fluorescent Light Fixture. The hood interior is illuminated by dual fluorescent lights that are located outside of the hood interior to provide a non-glare working environment. Explosionproof lighting (incandescent) is also available on specific models of the hood. 6. Factory Installed Service Fixtures. (Optional) Located on both the left and right panels are remotely controlled fixtures, which can be used for numerous supply services. They can be used regardless of the sash position as they are controlled from outside of the fume cavity. 7. Electrical Receptacles. One 115 volt duplex receptacle has been placed on the front of the hood structure to allow for the use of electrical equipment inside of the laboratory hood. NOTE: Electrical receptacles are not supplied on the explosion proof models of this hood. 8. Front Panel. Color coordinated panel is easily removed for lamp replacement and access to the electrical supply connection for the hood. 9. Fiberglass Reinforced Polyester Liner. One-piece, molded fiberglass liner features curved interior corners for easy cleaning. Bright interior white surface reflects light without glare. The liner exceeds all national codes for fire resistance, as well as being chemically resistant to most substances. 10. Integral Motor/Blower Assembly. A fractional horsepower motor and polypropylene impeller, mounted in a molded high impact plastic housing, provide the means for fume removal on the integral style hoods. 10

10 11 INTRODUCTION

11 INSTALLATION Your laboratory hood has been shipped to you in one carton (optional equipment has been packaged separately). Make sure to inspect hood thoroughly prior to installation and report any damage that may have occurred in transit directly to the freight carrier. When reporting damage on your hood, you should provide both the hood model number and serial number. This information can be found on the product serial tag, which is located behind the colored front panel and in the upper left-hand corner of the hood cabinet structure. 12

12 INSTALLATION Installation Factors Your fume hood should be positioned in the laboratory so that it is out of the traffic pattern and away from air disturbances such as doors, windows, air conditioning and heating vents, or other return air intakes. Hood location is very important as extraneous air currents can disturb the airflow at the face of the hood. Recommended hood placement would therefore be away from doorways, windows and busy traffic areas in your laboratory if at all possible. In addition to providing the proper location for the hood, you will also need to provide the following: 1. Supporting structure for the hood with a chemical resistant work surface. 2. Proper electrical service. Consult the hood serial tag for this information. 3. Availability of vacuum, air, gas, and water services piping for optional service fixtures as required on the hood structure. 4. Exhaust and auxiliary-air ductwork to be used for connection to the hood structure. 5. Place the drain hose, located at the rear of the hood liner, in an appropriately sized beaker or cup sink to collect condensation from the duct system. 6. If your hood incorporates an auxiliary-air system, you should wire the auxiliary-air blower and exhaust blower so that they are controlled from one source and not allow the auxiliary air system to operate with having the exhaust system functioning properly. The only assembly required on the hood is the attachment of the auxiliary-air bonnet assembly (optional) if your hood features that option. 13

13 INSTALLATION Service Fixture Connection (Optional) The four service fixtures, two located on each side of the hood structure, have been fully plumbed for your installation convenience. Excess supply tubing has also been supplied on each valve to allow you to extend out through the back of the hood, through the work surface, or out the top of the hood, to make connections to the individual supply lines in your facility. Three of the standard fixtures are pre-plumbed using l/4" copper tubing between both the valve, hose connector, and for the supply line. The upper right hand position fixture is pre-plumbed using l/4" copper tubing that features an internal tin coating between both the valve, hose connector, and the supply line for usage with natural gas. CAUTION: Do not use oxygen with service fixture as supplied with this hood. Contact Labconco for oxygen fixture information. Should access to the hood plumbing fixture bodies be required, remove the individual service fixture knobs by loosening their individual set screws. Next remove the three screws holding on the stainless steel corner covers. The valve body will now be fully exposed for any service work that may be necessary. The service fixtures supplied on your laboratory hood are designed for usage with the following services: Air Hot Water Vacuum Cold Water Natural Gas CAUTION: Natural gas should be used only in the service fixture that has been preplumbed with tin-lined copper tubing. Sulfur content of the gas could cause deterioration of standard copper supply lines. 14

14 INSTALLATION Sash Weight Release To protect the hood from damage in shipment the sash weight is not installed and has been secured directly to the shipping skid inside the hood. The plastic straps holding the sash assembly down for shipment must be removed and the sash blocked open to allow the sash weight to be removed from its shipping location inside the hood. Remove the right side panel on your fume hood by pushing up on the side panel until the mounting tabs clear the top of the hood and the side panel can be lifted away. The sash weight can now be placed into position by connecting the two sash cables to the appropriate clips on each end of the sash weight box. WARNING: After the sash weight has been attached to the sash cables, the mounting clips on each side of the weight box should be bent over each cable clip. Replace the side panel after checking for cable and pulley engagement. The sash should raise up and down without any signs of biding in operation. Should the sash fail to operate properly, check each of the sash cables to make sure they are routed through their respective sash pulley systems correctly and that each sash cable retainer is not binding on any of the sash pulleys. 15

15 NORMAL OPERATION Although the laboratory hood has been engineered to maintain the optimum in operator safety, caution should always be used while working in the hood. Good general housekeeping procedures with the following specific recommendations should allow you to operate your laboratory hood safely. Do not overload the work surface with apparatus or work material. The safe operation of the laboratory hood is based upon having proper airflow through the structure. Blocking the bottom of the baffle will change the airflow pattern in the hood causing turbulence and possible leakage at the face of the hood. (Don t store containers or supplies against baffles, as this will affect airflow through the hood). Usage of flammable or explosive materials in this hood unless it has been built with explosion proof components is not recommended. Do not work with or store chemicals in this hood without the exhaust system running. Perchloric acid use in this hood is not recommended. High level radioisotope materials are not recommended for usage in this hood. The use of heat generating equipment in this hood without the exhaust system operating properly can cause damage to the hood liner. Seal all ductwork joints properly to prevent the leakage of any exhaust contaminants from the duct. Place the condensate drain hose that has been taped to your baffle in a beaker or drain to properly collect any condensation that may drip back from the ducting system. 16

16 NORMAL OPERATION Sealing the Laboratory Hood When the hood has been set, plumbed and ducted in its final work position, it should then be sealed to the work surface. The sealing of the hood structure to the work surface will prevent spilled materials from collecting under the walls of the hood and causing deterioration to both the hood and work surface. A black PVC seal has been supplied with your hood for this purpose. Other materials such as silicone sealants may also be used to seal the hood structure. By placing notches at the corners of the seal, you will facilitate installation of the seal and also improve its appearance upon completion. (See illustration below for sealing details). 17

17 NORMAL OPERATION Exhaust Connection (Integral Blower Hood) The exhaust connection on this hood features a molded plastic duct connection sized to accept standard sized PVC duct material. The exhaust duct size has been designed to allow for a minimum of static pressure loss through the hood at normal operating face velocities, and still generate a sufficient transport velocity through the ductwork to safely exhaust the toxic materials being handled inside the hood. WARNING: The weight of the exhaust ductwork system must be supported independently of the hood superstructure. Do not allow the weight to be supported by the blower scroll as damage to the unit may result. NOTE: The exhaust duct used on this hood will be under positive pressure during operation. It is therefore important that all duct joint connections be sealed properly so as to eliminate the possibility of leaking exhaust contaminants inside your building. 18

18 NORMAL OPERATION Auxiliary-Air Connection The Auxiliary-Air Protector hoods require that the supplied mounting angles and optional duct adapter be mounted to the hood structure at the time of the installation of the auxiliary-air system. For the exact location and size of the exhaust duct connection on this hood, consult the detail drawing on Page 31 of this manual. Auxiliary-Air Chamber The chamber should be lifted up and over the front diffuser screen on your fume hood. This will allow the two mounting tabs to lock into the appropriate slots on the top of the hood super structure. As the chamber assembly is being lowered into its final position it should be held against the hood corner posts so it locks in on top of the hood header panel. NOTE: All electrical connections for the hood should be made prior to the installation of the Auxiliary-Air Chamber Assembly. Refer to Page

19 NORMAL OPERATION Front Panel Assembly Without Auxiliary Air The hood front panel is shipped installed. To remove this panel, simply loosen the two panel clamps on the top rear corners of the front panel and swing out of the way. The front panel can then be lifted up and removed. To lock the front panel back in place, lower the front panel down into position, swing panel clamps forward to overlap the top of the front panel, then tighten the screws. Exhaust Connection Remote Blower Hood The exhaust connection on your hood features a molded plastic duct connection sized to accept standard sized PVC duct material. The exhaust duct size has been designed to allow for a minimum of static pressure loss through the hood at normal operating face velocities, and generate a sufficient transport velocity through the ductwork to safely exhaust the toxic materials being handled in the laboratory hood. If an auxiliary-air system is used, wire both the auxiliary-air blower and exhaust blower together so that they are controlled from one electrical source. That way, if the exhaust blower fails the auxiliary-air blower will automatically shutdown and prevent from operating while the exhaust system is not operating. WARNING: The weight of both exhaust and auxiliary-air ductwork systems must be supported independently of the hood superstructure. Do not allow this weight to be supported by the hood structure, as damage to the superstructure may result. 20

20 ROUTINE MAINTENANCE Mild soap and water should be used to clean the fiberglass should it become soiled. The exhaust motor has been factory lubricated for two years of service. After this period, drops of SAE 20 automotive oil annually is sufficient. Reference the nameplate on the motor for additional oiling instructions. Belt tightness on the motor/blower assembly of your hood should be checked periodically for proper adjustment. The belt on your integral motor/blower has been factory set at a desired tension level. The tension on the belt can be measured by the amount of pressure exerted to deflect the belt l/2 from its normal position and this should be approximately 5 lbs. 21

21 PERFORMANCE TESTING The combination of your laboratory hood, exhaust ductwork, and exhaust blower enables you flexibility as to the airflow generated across the sash opening on the hood. To determine the actual face velocity through the sash opening, airflow velocity readings will need to be taken. This should be done across the sash opening of the hood in accordance with the Industrial Ventilation Manual section on laboratory hoods. 22

22 ELECTRICAL CONNECTION Prior to connecting any electrical wiring to the fume hood superstructure, refer to the hood identification plate for the proper electrical characteristics of your specific model. Both the identification plate and electrical connection boxes are accessible from the front of the fume hood by removing the front panel. The remote blower style hood is fully wired internally for 115 Volt, 60 Hz, 15 Amp electrical service. The integral blower style hood is fully wired internally for two 115 Volt, 60 Hz, 15 Amp electrical circuits. The Universal Protector Hood models do not feature internal wiring or electrical components excluding the fluorescent light with lead wire assembly. All other internal wiring, switches, and electrical outlets will have to be supplied and installed in the field. If your hood is Auxiliary-Air, you need to remove the front mounted louver assembly to gain access to the electrical junction boxes. The louver assembly can be removed by removing four mounting screws. Once all of the wiring connections have been made, the louver assembly should be reinstalled prior to operation of the hood. The fluorescent light has been mounted inside the hood header panel assembly and is sealed from any vapors used inside the hood structure. A gasketed tempered safety glass shield allows for the light to penetrate inside the cabinet, and insures that vapors cannot reach the light assembly. To change the fluorescent light bulbs in your hood, you must first remove the colored front panel from the hood. Next, remove the screws holding down the galvanized header panel cover plate and set aside. The fluorescent light assembly is now fully exposed and ready for service. Pull the light assembly straight up by the convenient hand hold recess until it clears the top of the header and lay it down towards you across the header for support. While the fixture is in this position, replace the defective bulbs, and reassemble. Should your hood be explosion proof in configuration, it will not feature any internal wires. All wiring for the enclosure MUST be done by a licensed electrician and conform to all local codes. In most cases, the hood will require the usage of conduit shielding to protect the wiring being brought into the hood and the grounding connection of the wiring shall be in such a manner that the terminal box cover may be removed without distributing the electrical connections. 23

23 REPLACEMENT PARTS REMOTE BLOWER HOODS MODEL DESCRIPTION SERIES Side Panel (used 2 places) (2) Sash Weight Box (only) Sash Pulley (used 4 places) (4) Sash Pulley *Light Switch & Blower Switch (2) Explosion Proof Light Fixture Sash Cable Left Sash Cable Right *Fluorescent Light (2 ea.) Baffle Hose Connector *Electrical Recept. Duplex Fixture Knob Sash Assembly *Ballast--115V Ballast--220V Sash Foil *Corner Cover Right w/elec. Cutouts Corner Cover Right w/o Elec. Cutouts *Corner Cover Left w/elec. Cutouts Corner Cover Left w/o Elec. Cutouts **Lamp Shield Sash Guide (2 req d) (2) Vinyl Seal (hood to countertop) Knob and Connector Label Wallplate Blank *Wallplate Duplex Recpt *Overlay-Corner Cover *Screw-Black Valve l/ Front Panel (Specify color when ordering) *These items are not used on explosion proof models. **Item not shown 24

24 REPLACEMENT PARTS REPLACEMENT PARTS DIAGRAM - REMOTE BLOWER HOODS 25

25 REPLACEMENT PARTS INTEGRAL BLOWER HOODS MODEL DESCRIPTION SERIES Side Panel (used 2 places) (2) Sash Weight Box (only) Sash Pulley (used 4 places) (4) Sash Pulley *Light Switch & Blower Switch (2) Explosion Proof Light Fixture Sash Cable Left Sash Cable Right *Fluorescent Light (1 ea.) Baffle Hose Connector *Electrical Recept. Duplex Fixture Knob Sash Assembly *Ballast--115V Ballast--220V Sash Foil *Corner Cover Right w/elec Cutouts Corner Cover Right w/o Elec Cutouts *Corner Cover Left w/elec. Cutouts Corner Cover Left w/o Elec. Cutouts *Lamp Shield Sash Guide (2 reg d.) Vinyl Seal (hood to countertop) Knob I.D. Inlay Kit *Wallplate Blank *Wallplate Duplex Recept *Overlay-Corner Cover *Screw-Black Valve l/ Front Panel Exhaust Motor (non-exp. proof model) Exhaust Motor (explosion proof model) V-Belt (all models) Impeller Wheel Motor Sheave (non-exp. proof model) Motor Sheave (explosion proof model) Impeller Sheave (non-exp. model) Impeller Sheave (exp. proof model) **Bearing Seal (all models) Blower Belt Guard *These items are not used on explosion proof models. **Item not shown on diagram 26

26 REPLACEMENT PARTS REPLACEMENT PARTS DIAGRAM - INTEGRAL BLOWER HOODS 27

27 WIRING DIAGRAM 28

28 29 WIRING DIAGRAM

29 WIRING DIAGRAM 30

30 31 DIMENSIONAL DRAWING

31 WARRANTY We are committed to providing our customers with quality equipment and service after the sale. Part of this objective involves keeping you informed of changes and new product additions. We therefore request that you take a moment to fill out the product registration card so we may know your location as well as some of the reasons that prompted you to purchase our products. Labconco provides a warranty on all parts and factory workmanship. The warranty includes areas of defective material and workmanship, provided such defect results from normal and proper use of the equipment. The warranty for all Labconco products will expire one year from date of installation or two years from date of shipment from Labconco, whichever is sooner, except the following: Purifier Delta Series Biological Safety Cabinets, which carry a three-year warranty from date of installation or four years from date of shipment from Labconco, whichever is sooner. Carts carry a lifetime warranty. Glassware is not warranted from breakage when dropped or mishandled. This limited warranty covers parts and labor, but not transportation and insurance charges. In the event of a warranty claim, contact Labconco Corporation or the dealer who sold you the product. If the cause is determined to be a manufacturing fault, the dealer or Labconco Corporation will repair or replace all defective parts to restore the unit to operation. Under no circumstances shall Labconco Corporation be liable for indirect, consequential, or special damages of any kind. This statement may be altered by a specific published amendment. No individual has authorization to alter the provisions of this warranty policy or its amendments. Lamps and filters are not covered by this warranty WARNING: The disposal and/or emission of substances used in connection with this equipment may be governed by various federal, state or local regulations. All users of this equipment are urged to become familiar with any regulations that apply in the user s area concerning the dumping of waste materials in or upon water, land or air and to comply with such regulations. 32

32 SHIPPING CLAIMS If a shipment is received in visibly damaged condition, be certain to make a notation on the delivering carrier s receipt and have his agent confirm the damage on your receipt. Otherwise, the damage claim may be refused. If concealed damage or pilferage is discovered, notify the carrier immediately and retain the entire shipment intact for inspection. Interstate Commerce Commission rules require that the claim be filed with the carrier within 15 days after delivery. NOTE: Do not return goods. Goods returned without prior authorization will not be accepted. Labconco Corporation and its dealers are not responsible for shipping damage. Claims must be filed directly with the freight carrier by the recipient. If authorization has been received to return this product, by accepting this approval, the user assumes all responsibility and liability for biological and chemical decontamination and cleansing. Labconco reserves the right to refuse delivery of any products, which do not appear to have been properly cleaned and/or decontaminated prior to return. 33

33 CONTACTING LABCONCO If you have any questions that are not addressed in this manual, or if you need technical assistance, please contact Labconco s Sales Information Department at , and Service Information at or , between the hours of 7:00 a.m, and 6:00 p.m., Central Standard Time. You can visit Labconco through the Internet at: or labconco@labconco.com 34