FreeZone
Triad Freeze Dry System
Models
74000 Series
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User’s Manual
Labconco Corporation
8811 Prospect Avenue
Kansas City, MO 64132-2696
800-821-5525, 816-333-8811
FAX 816-363-0130
E-MAIL labconco@labconco.com
HOME PAGE www.labconco.com
Please read the User’s Manual before operating the equipment.
Copyright © 2005, 2007, 2012, 2013, 2014 Labconco Corporation. All rights reserved.
Warranty
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. Glassware is not warranted from breakage when dropped or mishandled.
The warranty for FreeZone® Freeze Dry Systems will expire one year from date of installation or two
years from date of shipment from Labconco, whichever is sooner. Warranty is non-transferable and
only applies to the owner (organization) of record.
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.
Damage due to corrosion or accidental breakage is not covered.
The information contained in this manual and the accompanying products are copyrighted and all rights
reserved by Labconco Corporation. Labconco Corporation reserves the right to make periodic design
changes without obligation to notify any person or entity of such change.
Returned or Damaged Goods
Do not return goods without the prior authorization from Labconco. Unauthorized returns will not be
accepted. If your shipment was damaged in transit, you must file a claim directly with the freight carrier.
Labconco Corporation and its dealers are not responsible for shipping damages.
The United States Interstate Commerce Commission rules require that claims be filed with the delivery
carrier within fifteen (15) days of delivery.
Limitation of Liability
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 required 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. Labconco Corporation is held harmless with respect to
user’s compliance with such regulations.
Contacting Labconco Corporation
If you have questions that are not addressed in this manual, or if you need technical assistance, contact
Labconco’s Customer Service Department or Labconco’s Product Service Department at 1-800-821-5525
or 1-816-333-8811, between the hours of 7:00 a.m. and 6:00 p.m., Central Standard Time.
Part #7373300, Rev. E
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CHAPTER 1: INTRODUCTION 1
Freeze Dry Process 1
Freeze Dry Rates 2
Freeze Dry Capacity 3
Samples Containing Volatile Substances 3
CHAPTER 2: PREREQUISITES 5
Electrical Requirements 5
Location Requirements 5
Vacuum Pump Requirements 6
CHAPTER 3: GETTING STARTED 7
Unpacking Your Triad Freeze Dry 7
Triad Freeze Dry Components 8
Setting Up Your Triad Freeze Dry System 8
Component Orientation and Hose Connection 8
Venting the Vacuum Pump 9
Electrical Connection 9
Chemical Resistance of Freeze Dryer Components 9
Solvent Safety Precautions 11
CHAPTER 4: OPERATING INSTRUCTION 12
Triad Freeze Dry Controls 13
Operation Checklist 14
Vacuum Pump Ballast Setting 14
Operating the Triad Freeze Dry System 15
Set-Up 15
Setting the Operating Vacuum Level 17
Manual Control Operation 18
Automatic Control Operation 19
Programming 20
Starting the Freeze Dry Cycle 21
Changing the Program Parameters in the Middle of a Run 22
Stopping the Freeze Dry Cycle 22
Monitoring the system Operation 23
Sample Freezing 23
Shelf Loading 23
Freeze Drying inside the Chamber 23
Manual Mode with Pre Frozen Samples 23
Manual Mode with Unfrozen Samples 24
Auto Mode with Pre Frozen Samples 24
Auto Mode with Unfrozen Samples 24
Stoppering Vials 25
Vacuum Break/Backfilling 25
Freeze Drying using Manifold Valves 26
Defrosting 27
Alarms 28
Shelf Temperature Variations 28
Collector Temperature Variations 28
Vacuum 28
Vacuum Pump Service 28
Shelf Temperature Set Point 28
Power Failure 28
Platen Tilt 29
CHAPTER 5: MAINTAINING YOUR FREEZE DRY SYSTEM 30
CHAPTER 6: USING THE RS232 RECEPTACLE 32
Computer Connection for Computer Interface 32
CHAPTER 7: TROUBLESHOOTING 35
Vacuum System 35
Vacuum Pump 35
Gaskets, Tubing, Connections, Sample Valves 36
Diagnostic Mode 37
Refrigeration Module Operation 39
Filling the Fluid System 39
Heat Transfer Fluid Precautions 41
Heat Transfer Fluid First Aid Procedures 41
CHAPTER 8: MODIFYING YOUR FREEZE DRY
SYSTEM DISPLAY 42
Modifying the Display 42
APPENDIX A: FREEZE DRY SYSTEM COMPONENTS 44
APPENDIX B: FREEZE DRY SYSTEM DIMENSIONS 46
APPENDIX C: FREEZE DRY SYSTEM SPECIFICATIONS 47
Electrical Specifications 47
Environmental Conditions 47
Performance Specifications 48
APPENDIX D: FREEZE DRY SYSTEM ACCESSORIES 49
1
CChhaapptteerr 11::
IInnttrroodduuccttiioonn
Congratulations on your purchase of a Labconco FreeZone® Triad Freeze
Dry System, which is designed for laboratory lyophilization procedures. The
refrigerant used in the refrigeration system is CFC-free so it will not
endanger the environment. The unit is easy to install and maintain. Proper
care and maintenance of this product will result in many years of dependable
service.
Freeze Dry Process
Freeze drying is an important process in sample preparation and for the
preservation and storage of biologicals, pharmaceuticals and foods. Of the
various methods of dehydration, freeze drying (lyophilization) is especially
suited for substances that are heat sensitive. Other than food processing (e.g.,
coffee, whole dinners), freeze drying has been extensively used in the
development of pharmaceuticals (e.g., antibiotics) and preservation of
biologicals (e.g., proteins, plasma, viruses and cell lines). The nondestructive
nature of this process has been demonstrated by the retention of viability in
freeze dried viruses and microorganisms.
Freeze drying is a process whereby water or other solvent is removed from
frozen material by converting the frozen water directly into vapor without the
intermediate formation of liquid water. The basis for this sublimation
process involves the absorption of heat by the frozen sample in order to
vaporize the ice; the use of a vacuum pump to enhance the removal of water
vapor from the surface of the sample; the transfer of water vapor to a
collector; and the removal of heat by the collector in order to condense the
water vapor. In essence, the freeze dry process is a balance between the heat
absorbed by the sample to vaporize the ice and the heat removed from the
collector to convert the water vapor into ice.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 1: Introduction
2
Table 1
Safe Temperature and Drying Times for Selected Materials
Material 10mm
Thick
Safe
Temperature °C
Collector
Temperature °C
Hours
(Approx.)
Milk
-5
-40
10
Urea
-7
-40
10
Blood Plasma
-10 to -25
-40
16
Serum
-25
-40
18
Vaccinia
-30 to -40
-50
22
Influenza Vaccine
-30
-50
24
Human Tissue
-30 to -40
-50
48
Vegetable Tissue
-50
-80
60
Freeze Dry Rates
The efficiency of the freeze drying process is dependent upon the surface
area and the thickness of the sample, the collector temperature and vacuum
obtained, the eutectic point and solute concentration of the sample. It is
important to remember these factors when trying to obtain efficient
utilization of your freeze dry system. A listing of selected materials and their
approximate drying times are shown in Table 1 for your reference.
*Total sample quantities are contingent on various Triad Freeze Dry System capacities.
Up to the point of overloading the system, the greater the surface area of the
sample, and the faster the rate of freeze drying. By contrast, for a given
surface area, the thicker the sample the slower the rate of freeze drying. This
is based on the fact that the heat of sublimation is usually absorbed on one
side of the frozen sample and must travel through the frozen layer to vaporize
water at the other surface. In addition, as the sample is freeze dried, the
water vapor must travel through the layer of dried material. The thicker the
sample, the greater the chance that the dried layer may collapse which would
cause an additional decrease in the rate of freeze drying.
The surface area and thickness of the sample can usually be ignored when
each sample contains only a few milliliters. However, for larger volumes, the
samples should be shell frozen to maximize the surface area and minimize
the thickness of the sample. The volume of the freeze dry container should
be two to three times the volume of the sample.
In order for lyophilization to occur, ice must be removed from the frozen
sample via sublimation. The collector and the vacuum pump accomplish this.
The collector, which should be at least 15 to 20°C colder than the eutectic
temperature (melting temperature) of the sample, traps vapor as ice. Since
the vapor pressure at the collector is lower than that of the sample, the flow
of water vapor is from the sample to the collector.
Since this vapor diffusion process occurs very slowly under normal
atmospheric conditions, a good vacuum is essential to maintain an efficient
rate. In many applications, the maintenance of a vacuum of 0.133 mBar or
less is recommended.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 1: Introduction
3
The rate of freeze drying is directly proportional to the vapor pressure and the
vapor pressure is dependent upon both eutectic temperature and solute
concentration of the sample. For example, a solution of sodium chloride and
water would freeze dry at a slower rate than pure water. The eutectic
temperature of a sodium chloride solution is about –21°C and at this
temperature the vapor pressure is about 1/16 that of water at 0°C. Although
the eutectic temperature is not dependent upon the concentration of sodium
chloride, the vapor pressure of the water would decrease as the concentration
of sodium chloride increased. This is due to the fact that as the solute
concentration increases, less of the surface area of the frozen sample is
occupied by water. In general, most solutions or biological samples will have
a eutectic temperature of –10° to –25°C. However, if the sample contains a
simple sugar such as glucose or if the sample is animal or plant tissue, the
eutectic temperature may be as low as –30° to –50°C.
Freeze Dry Capacity
The volume of a sample that can be freeze dried at one time is related to
factors discussed previously and the size and design of the freeze dry system.
With any given instrument, the capacity is based on the surface area of the
sample, the eutectic temperature and concentration of the sample and the rate
and amount of heat transferred to the frozen sample. Of these factors, the
eutectic temperature is the most important factor in determining the amount
of sample that can be freeze dried at one time, particularly when flasks are
used. This is because as the eutectic temperature decreases, the vapor
pressure decreases but the rate of heat absorption by the sample does not
change. This tends to promote melting of the sample, which leads to a
marked increase in vapor pressure and ultimately overloads the collector and
vacuum pump. Samples that have eutectic temperatures of –20°C or lower
should be placed on the freeze dry system one flask at a time so that the
vacuum in the system may recover before adding another sample to the
system. If the vacuum does not recover, the capacity of the freeze dry system
has been exceeded and the sample should be removed.
If there is a problem with a particular type of sample melting when placed on
the freeze dry system, dilution of the sample with more water or providing
some insulation around the flask to decrease the rate of heat absorption by the
sample may help.
Samples Containing Volatile Substances
In certain cases the solvent in a sample to be freeze dried may contain
volatile components such as acetonitrile, methanol, acetic acid, formic acid or
pyridine.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 1: Introduction
4
In addition to these substances having an effect on the eutectic temperature,
they may increase the vapor pressure at the surface of the sample. Also,
compared to water, they will require the absorption of less heat for
sublimation to occur. Hence, samples that contain volatile substances will
have a greater tendency to melt, particularly when placed in flasks or exposed
to room temperature. If a sample containing a volatile substance tends to
melt when placed on a freeze dry system, dilution of the sample with more
water will help keep the sample frozen. For example, a 0.2M solution of
acetic acid is much easier to freeze dry than a 0.5M solution.
Product Service 816-333-8811 or 1-800-522-7658
5
CChhaapptteerr 22::
PPrreerreeqquuiissiitteess
Before you install your Triad Freeze Dry System, you must be certain that the
area is level and of solid construction. An electrical source must be located
near the installation site.
Carefully read this chapter to learn:
Electrical supply requirements.
Location requirements.
Vacuum pump requirements.
Refer to Appendix C: Freeze Dry System Specifications for complete
electrical and environmental conditions, specifications and requirements.
Electrical Requirements
The Triad Freeze Dry System requires a dedicated electrical outlet. This
outlet requires a 20 Amp circuit breaker or fuse for all models. Various
power cord configurations are provided with 230V models. If this does not
match with the available receptacle, remove this plug and replace it with an
approved plug of the suitable style.
Location Requirements
The Triad Freeze Dry System should be located in an area that provides an
unobstructed flow of air around the cabinet. This air cools the refrigeration
system. The refrigeration system draws air in through the left side and
exhausts it through the right side. A minimum of 3" must be allowed
between the rear and both sides of the Triad Freeze Dry System and adjacent
wall surfaces. Restriction of airflow during operation could adversely affect
performance. The Triad Freeze Dry System must be placed on a work surface
or table that will support over 400 lbs.
Refer to Appendix B: Freeze Dry System Dimensions for drawings.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 2: Prerequisites
6
Vacuum Pump Requirements
The user must provide a vacuum pump. A vacuum pump with a
displacement of 144 liters per minute and 0.002 mBar ultimate pressure is
adequate for most samples. The inlet fitting on the vacuum pump must be
suitable for 3/4" ID vacuum hose, which is provided with the FreeZone
Triad Freeze Dry System. It is recommended that the vacuum pump is
equipped with an exhaust filter to minimize oil mist exhausting from the
vacuum pump.
The operating vacuum level may be set on the freeze dry system. The higher
the pressure is set, the more likely it is that oil mist will be exhausted.
Vacuum pumps should be equipped with a reverse IEC plug. This will allow
the vacuum pump to be plugged into the receptacle on the back panel of the
Freeze Dry System. Refer to Appendix D: Triad Freeze Dry System
Accessories for vacuum pumps available from Labconco.
Product Service 816-333-8811 or 1-800-522-7658
7
CChhaapptteerr 33::
GGeettttiinngg SSttaarrtteedd
Now that the site for your Triad Freeze Dry System is properly prepared, you
are ready to unpack, inspect, install and test your freeze dry system.
Read this chapter to learn how to:
Unpack and move your freeze dry system.
Set up your freeze dry system.
Safely use solvents with your freeze dry system.
Unpacking Your Triad Freeze Dry System
Carefully unpack your freeze dry system and inspect it for damage that may
have occurred in transit. If your freeze dry system is damaged, notify the
delivery carrier immediately and retain the entire shipment intact for
inspection by the carrier.
The Triad Freeze Dry System weighs over 400 lbs. (181 Kg). The
carton allows for lifting with a mechanical lift truck or hand
truck. If you must lift the freeze dry system manually, use at least
four (4) persons and follow safe lifting guidelines.
If your freeze dry system was damaged in transit, you must file a
claim directly with the freight carrier. The United States
Interstate Commerce Commission rules require that claims be
filed with the delivery carrier within fifteen (15) days of delivery.
Labconco Corporation and its dealers are not responsible for
shipping damage.
Do not return goods without the prior authorization of Labconco,
unauthorized returns will not be accepted.
Do not discard the carton or packing material for your freeze dry
system until you have checked all of the components, installed and
tested the system.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 3: Getting Started
8
Power Cords
Catalog #
Description
Volts
Hz
1336500
1342100
1332601
1332701
7400030
Triad Freeze Dryer System
230
50 X
7400040
Triad Freeze Dryer System
230
60 X
7400060
Triad Freeze Dryer System
230
50 X
7400070
Triad Freeze Dryer System
230
50 X
Part #
Qty.
Component Description
7373300
1
User’s Manual
7373436
1
Tubing
1488800
2
Clamp
1291000
1
Female IEC Plug
Triad Freeze Dry System Components
Locate the model of freeze dry system you received in the following table.
Verify that the components listed are present and undamaged.
If you did not receive one or more of the components listed, contact
Labconco Corporation immediately for further instructions.
Plus the following:
Setting Up Your Triad Freeze Dry System
Component Orientation and Hose Connections
A minimum of 3" should be allowed between the back of the freeze dry
system and the adjacent wall surface and between the sides of the freeze
dryer and the adjacent wall surfaces. Restriction of the airflow through the
cabinet during operation could adversely affect performance.
Position the vacuum pump near the vacuum exhaust port on the rear of the
cabinet. Attach the supplied hose to the exhaust port using the clamp
provided. Attach the other end of the hose to the inlet fitting on the vacuum
pump. Secure with the clamp provided. The hose may be cut to proper length
to allow for gentle bends without kinks.
Connect the power cord from the vacuum pump into the outlet on the back of
the unit. If your vacuum pump power cord does not have a female IEC plug,
replace the cord end with the female IEC plug provided with the unit (Part
number 1291000).
Product Service 816-333-8811 or 1-800-522-7658
Chapter 3: Getting Started
9
Figure 1
Venting the Vacuum Pump
If any materials will be placed in the freeze dry system that can liberate
hazardous gases when heated, the vacuum pump exhaust must be vented to a
fume hood or other ventilation device.
Electrical Connection
Connect the power cord into the receptacle on the back of the freeze dry
system and connect the other end into a suitable power receptacle.
The freeze dry system is now installed and must be tested to make certain the
system is free of leaks. Close the door, turn on the freeze dry system
refrigeration and allow the collector temperature to reach –40° or lower, this
could take 20 to 30 minutes. Make sure the Stoppering Control is in the
“RAISED” position and the Vacuum Release control is in the “CLOSED”
position. Start the vacuum pump and monitor the vacuum gauge. The
vacuum on the freeze dry system should reach 0.133 mBar within 30 minutes
and should achieve an ultimate vacuum of 0.040 mBar or lower within 18
hours. If 0.040 mBar cannot be achieved, consult the troubleshooting section
of this manual.
Chemical Resistance of Freeze Dry System
Components
The FreeZone Triad Freeze Dry System is designed to be chemically
resistant to most compounds that are commonly used in Freeze drying
processes. However, by necessity, the freeze dry system is comprised of a
number of different materials, some of which may be attacked and degraded
by certain chemicals. The degree of degradation is dependent on the
concentration and exposure duration.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 3: Getting Started
10
Acids
Buffers
Solvents
Component
Material
Acetic Acid
20%
Formic Acid
Trifluoroacetic
Acid (TFA)
Calcium
Chloride
Sodium
Phosphate
Acetone
Acetonittirle
Carbon
Tetrochloride
Cyclohexane
Dioxane
Methyl t-Butyl
Ether (BTBE)
Pyridine
Valve Stem
Acetal
C D D D D
Door
Acrylic
D D D D
Hoses, Gaskets & Valve
Bodies
Neoprene
C D D C C D D D C
D
Flask Top, Drain Hose
Silicon Rubber
C D D D D D C D Chamber & Fittings
Stainless Steel
C
Some of the major components of the freeze dry system that are susceptible
to degradation are as follows:
C = Moderate degradation; limited use
D = Severe degradation; infrequent use recommended; immediate thorough
cleaning required.
Most common compounds used in freeze drying processes, if allowed to
enter the vacuum pump, will degrade the oil and cause damage to the
vacuum pump.
Sugars and proteins typically will have minimal negative effect on any of
the materials of construction.
When using compounds in the freeze dry system that are hostile to the
materials of construction, it is imperative the equipment is thoroughly
cleaned after use.
Rubber and plastic components that have been exposed to damaging
compounds should be removed and flushed with water.
The oil in the vacuum pump should be checked often. It must be changed
if it is cloudy, shows particles or is discolored. The useful life of vacuum
pump oil can be extended if the vacuum pump is operated for an extended
period of time after a freeze dry run. This allows contaminants to be
purged from the hot oil. This must be done with the inlet to the pump
blocked off to prevent air from free flowing through the pump. This is
accomplished by closing all sample valves on a clean, dry, freeze dry
system and turning on the vacuum pump. If the pump is operated at an
elevated vacuum level (> 10mBar), oil may be expelled from the pump
and damage could occur.
Optional secondary traps are available to help extend the life of the vacuum
pump. These traps are installed between the freeze dry system and the
vacuum pump. Contact Labconco for assistance in determining which trap is
right for your application.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 3: Getting Started
11
With prudent maintenance the freeze dry system will provide years of
service. Warranty on the affected parts will be voided if maintenance has
been obviously neglected. If you have questions about using specific
compounds in the freeze dry system, contact Labconco Technical Service at
1-800-821-5525 or 816-333-8811 or e-mail: labconco@labconco.com.
Solvent Safety Precautions
Solvents used in the freeze dry system may be flammable or
hazardous to your health. Use extreme caution and keep
sources of ignition away from the solvents. When using
flammable or hazardous solvents, the vacuum pump must be
vented to a fume hood.
Hazardous materials such as strong acids or bases, radioactive
substances and volatile organics must be handled carefully and
promptly cleaned up if spilled. If a sample is spilled in the
collector chamber it must immediately be cleaned up per MSDS
procedures or damage to the equipment or injury may occur.
NOTE: Various Federal, State or local regulations may govern the disposal
of substances used in connection with this equipment. 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.
Product Service 816-333-8811 or 1-800-522-7658
12
CChhaapptteerr 44::
OOppeerraattiinngg IInnssttrruuccttiioonnss
Read this chapter to learn how to:
Understand the display.
Operate the controls.
Connect samples.
Do not use the freeze dry system in a manner not specified by the
manufacturer (refer to Appendix C: Freeze Dry System
Specifications). The electrical protection may be impaired if used
inappropriately.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 4: Operating Instructions
13
Figure 2
Triad Freeze Dry System Controls
The control panel for the Triad Freeze Dry System is shown with a
description about its function.
1. Display: Displays all necessary programming and operational data. Provides
prompts to aid in programming.
2. Display Button: Changes format of display from “monitor” to “auto” to
“manual” to “set up” screen.
3. Display Indicators: Green INDICATOR shows which display “screen” is
shown.
4. Alarm Indicator: Red INDICATOR shows that a system alarm has occurred.
5. Defrost: Used to manually start or stop the defrost operation.
6. Vacuum: Used to manually start or stop the vacuum pump.
7. Decrease Button: Used in programming to decrease a parameter set point.
8. Increase Button: Used in programming to increase a parameter set point.
9. Enter Button: Used in programming to enter a selected set point into
memory.
10. Mode Selector Button: Selects the mode of operation – either manual or
automatic.
11. Mode Indicator: Green INDICATOR shows whether the control is set to
operate either in the automatic or manual mode.
Product Service 816-333-8811 or 1-800-522-7658
Chapter 4: Operating Instructions
14
12. Run/Stop Button: Initiates the start or stop of the lyophilization process.
13. Run/Stop Indicator: Green INDICATOR burns steadily while freeze drying
is in progress and turns off when the Run/Stop button terminates a run. The
green INDICATOR flashes if freeze drying is in progress and a power failure
occurs.
14. Stoppering: Controls the stoppering platen up and down movement. The
mechanism will function only while the chamber is under vacuum. The
stoppering action should be closely monitored when operating this control.
15. Vacuum Release: Vents the chamber so the chamber door can be opened.
This control can also vent gas into the chamber when the gas supply is
properly connected to the backfill port.
16. Back Fill: A regulated tank of gas may be connected to the port to allow the
introduction of gas into the chamber after freeze drying. The port accepts 1/8"
tubing.
Ethylene Oxide is not recommended for use in this
freeze dry system for decontamination because of its
hazardous and corrosive properties.
17. Power Switch: Turns all power to Triad Freeze Dry System ON or OFF. (Not
shown). Located on left side of cabinet.
Operation Checklist
The following checklist should be followed prior to each use of your freeze
dry system:
1. Wipe out the interior of the chamber with a soft cloth or paper towel to
remove any moisture or debris.
2. Check the collector tray drain hose to ensure that the hose is free of
moisture and that the drain plug is securely installed.
3. Using a soft, lint-free cloth or paper towel, wipe the door gasket to
remove any dirt and contaminants that could cause a vacuum leak.
Vacuum grease is not required on the door gasket.
4. Check that each sample valve is closed or in the “vent” position. See
Figure 4.
Vacuum Pump Ballast Setting
Most vacuum pumps are equipped with gas ballast mechanism. The freeze
dry process requires high vacuum. Therefore, it is recommended that the gas
ballast be closed during the operation of the Triad Freeze Dry System.
Note: If the gas ballast is left open for extended periods of operation, the oil
can be pumped out the exhaust, causing the pump to fail.
Product Service 816-333-8811 or 1-800-522-7658
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