1. Manuals
  2. Brands
  3. Cryomech Manuals
  4. Industrial Equipment
  5. LNP-40
  6. Installation, operation and routine maintenance manual

Cryomech LNP-40 Installation, Operation And Routine Maintenance Manual

Liquid nitrogen plant
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Model LNP-40
Liquid Nitrogen Plant
INSTALLATION, OPERATION and
ROUTINE MAINTENANCE MANUAL

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LNP-40 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Cryomech LNP-40

Summary of Contents for Cryomech LNP-40

  • Page 1 Model LNP-40 Liquid Nitrogen Plant INSTALLATION, OPERATION and ROUTINE MAINTENANCE MANUAL...
  • Page 2 Except as expressly contained in this document, there are no other warranties granted or extended by the manufacturer. Cryomech, Inc. reserves the right to add, change, modify or delete any or all information contained herein without prior written notice. Revisions to this document may be issued at the time such changes and/or deletions occur.

  • Page 3: Table Of Contents

    Contents Section 1 Overview Section 2 Warranty Section 3 Safety Section 4 Inspection and Unpacking Section 5 Specifications Section 6 Installation Section 7 Operation Section 8 Routine Maintenance Appendix Spray Lubricant Instructions...

  • Page 4: Overview

    Section 1 Overview 1.1-N...
  • Page 5 The nitrogen generator uses the compressed air to produce gaseous nitrogen. The gaseous nitrogen enters the dewar where it is liquefied and stored. A Cryomech Cryorefrigerator is used to liquefy the nitrogen. The liquid nitrogen plant is fully automatic and will shut down the cryorefrigerator when the dewar is full.
  • Page 6 The main body of the manual provides a detailed discussion of everything you will need in order to install and operate the Cryomech Liquid Nitrogen Plant and to perform routine maintenance. It is divided into 8 sections. Illustrations accompany the discussion as needed for clarification.
  • Page 7 Air Compressor: The standard air compressor, if supplied by Cryomech, is a two stage, pressure lubricated compressor with a horizontal receiving tank. A pressure switch automatically maintains the compressed air pressure required by the nitrogen generator.
  • Page 8 Overview Dewar: The dewar is a stainless steel, vacuum jacketed container built for the purpose of storing liquid nitrogen with minimal boil off. The dewar is sealed from the atmosphere so that only nitrogen gas flowing from the N generator can enter it. The cold head, attached to the top of the dewar, liquefies the nitrogen gas inside the dewar.
  • Page 9 Liters per Minute Male Pipe Thread Nitrogen OFHC Oxygen-Free High Conductivity (describes a form of Copper) PSIG Pounds per Square Inch Gauge 1.4 Cryomech Contact Information Cryomech, Inc. 113 Falso Drive Syracuse, NY 13211 Phone: (315) 455-2555 Fax: (315) 455-2544 Email: cryoservice@cryomech.com...

  • Page 10: Warranty

    Section 2 Warranty 2.1-N...
  • Page 11 Cryomech, Inc. extends a warranty on all parts and workmanship for a period of one (1) year from the date of shipment from Cryomech. This warranty covers all non-user serviceable components of the air compressor.
  • Page 12 Warranty • The air compressor must be installed and operated according to the manufacturer’s specifications included in the air compressor’s instruction manual. Failure to follow the manufacturer’s instructions will void the warranty. See Sections 6 and 7. • If the air compressor must be bolted to the floor, please pay special attention to the mounting instructions included in Section 3 of the air compressor’s instruction manual.

  • Page 13: Safety

    Section 3 Safety 3.2-N...
  • Page 14 Section 3: Safety 3.1 Safety and information symbols 3.1.1 Equipment symbols The safety and information symbol stickers placed on Cryomech Liquid Nitrogen Plants as well as Cryorefrigerators are defined below. Alternating current. The symbol signifies that alternating current is present.
  • Page 15 Safety 3.2 Warnings and cautions Warnings and cautions for the Cryomech Liquid Nitrogen Plants are listed here by subsystem. The same warnings and cautions appear in the appropriate places in the unpacking, installation, operation and routine maintenance sections of this document.
  • Page 16 Safety Section 6.3 Helium compressor installation CAUTION Failure to follow these installation guidelines could result in voiding the warranty. Section 6.3.1 Prepare the compressor package location WARNING The compressor package must be positioned to provide easy access to the front- panel mounted circuit breaker.
  • Page 17 Safety Section 6.3.4 Connect the helium flex lines to the cold head and the helium compressor package CAUTION Follow the procedure carefully when connecting and disconnecting the helium flex lines. Failure to follow the procedure can cause accidental coupling disassembly, destruction of the sealing O-ring, and helium loss.
  • Page 18 Safety CAUTION Do not apply heat to the automatic drain valve. Doing so will damage or destroy the drain valve. Section 6.5 Refrigerated air dryer installation (option) CAUTION The refrigerated air dryer must be installed and operated according to the manufacturer’s specifications included in the dryer’s instruction manual.
  • Page 19 Safety WARNING One lead of the air compressor is grounded. Never bypass this ground or attach the air compressor to an ungrounded circuit. A dangerous electrical hazard will develop. Section 6.6.5 Check for correct rotation CAUTION Do not start the compressor before checking for proper oil level. Refer to the air compressor instruction manual for proper oil charge.
  • Page 20 Safety 3.2.3 Section 7. Operation Section 7.1 Starting the refrigerated air dryer (option) CAUTION The refrigerated air dryer must be installed and operated according to the manufacturer’s specifications included in the dryer’s instruction manual. Failure to follow the manufacturer’s instructions will void the warranty. Section 7.2 Starting the air compressor CAUTION The air compressor must be installed and operated according to the manufacturer’s...
  • Page 21 Safety Section 7.4.2 Startup procedure CAUTION Running the compressor package in reverse for any significant length of time will void the warranty. If the power cord is not wired properly the compressor will run in reverse and there will be no pressure differential on the pressure gauges. Turn the system off immediately.
  • Page 22 Failure to maintain the system properly will void the warranty. Section 8.3 Cold head CAUTION Service to the cold head must be performed using Cryomech parts and the appropriate work instructions. CONTACT CRYOMECH IF THE COLD HEAD NEEDS SERVICING. Section 8.4 Helium compressor adsorber replacement CAUTION At no time should the Aeroquip®...
  • Page 23 Safety Section 8.6 Recharge helium CAUTION When adding helium, the helium must be 99.999% pure. Contamination by other gases will result in the freezing of the contaminant gases in the cold head because their freezing temperature is much higher than that of helium. Contaminants in the helium charge will severely degrade the cold head's function and it will require factory servicing.
  • Page 24 Safety WARNING Failure to disconnect the power to the electrical protection device before attempting to replace the fuses may result in serious injury or death. 3-11 26Apr07...

  • Page 25: Inspection And Unpacking

    Section 4 Inspection and Unpacking 4.1-N...
  • Page 26 2) Check for tip indicators on the inside of the packing crate and notify Cryomech if interior tip indicators have been activated even though tip indicators on the outside were not.
  • Page 27 Check the pressure readings on both pressure gauges. If either gauge reads 5 PSIG (.34 bar) lower than the recorded value, contact Cryomech. 4.3.3 Dewar Inspect the dewar and the components attached to it for any signs of damage such as dents or scratches.
  • Page 28 4.4 Returning a system to Cryomech Preparation of helium compressor, helium and nitrogen flex lines, dewar and air compressor 1) Contact Cryomech for an RMA number and for additional detailed instructions on how to properly return system components. 2) Repackage the system:...

  • Page 29: Specifications

    Section 5 Specifications 5.3-N...
  • Page 30 Operation of the liquid nitrogen plant in any situation that does not meet the specifications in this section will void the warranty. If you plan to operate the system outside any of the specified conditions, contact Cryomech. 5.2.1 Weights and dimensions...
  • Page 31 Specifications Water Flow Rate (LPM) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 CP950 CP970 CP980 Water Flow Rate (GPM) Figure 1: Cooling Water Requirements* Water Pressure Drop (bar) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 CP950/CP970 CP980 Water Pressure Drop (PSI)
  • Page 32 Specifications 5.2.3 Helium compressor electrical specifications 200/230 Volt 440/480 Volt 200 Volt 380/415 Volt Parameter 60 Hz Model 60 Hz Model 50 Hz Model 50 Hz Model Nominal 200/230 VAC 440/480 VAC 200 VAC 380/415 VAC voltage Operating voltage 180 - 253 VAC 396 - 528 VAC 180 - 220 VAC 342 - 456 VAC...
  • Page 33 Operation above 100°F will cause overheating and subsequent problems. If a unit must be subjected to either extreme, Cryomech must be consulted. 5.2.7 Safety Devices A number of safety switches and valves are located inside the compressor package and on the cold head.
  • Page 34 Specifications High-Pressure Atmospheric Relief Valve The compressor package high-pressure atmospheric relief valve is set at 377 ± 5 PSIG (26 ± .34 bar). At pressures above 377 PSIG (26 bar) the relief valve will open automatically and relieve pressure to the atmosphere. Internal Motor Overload Switch An internal motor overload switch, located inside the compressor module, protects the system by sensing excessive current draw and temperature.
  • Page 35 Specifications 5.3 Description of the helium compressor Power Hour Low Pressure Low Pressure Switch Meter Gauge Aeroquip High Pressure Gauge Dewar Cord Connector High Pressure Aeroquip Circuit Breaker Service Valve Service Access Cooling Water Power Inlet Connection Cord Cooling Water Outlet Connection Temperature Pressure...
  • Page 36 Specifications Exhaust Air Vents Low Pressure Gauge Low Pressure Hour Aeroquip Meter Power High Switch Pressure Gauge Dewar Cord High Connector Pressure Aeroquip Circuit Breake Service Valve Service Access Power Cord Temperature Pressure Switch Reset Switch Reset Figure 5-4: Front panel of an air cooled compressor package...
  • Page 37 Specifications 5.3.1 Front panel interfaces This section describes the function of all operator interfaces on the front panel of the CP900 Series Compressor Package, including switches and valves. It also describes the functions of all connectors, electrical cords and gauges on the front panel. Low-Pressure Aeroquip®...
  • Page 38 Specifications Cooling Water Inlet Connection The cooling water inlet connection provides water to the compressor package from your facility to cool the compressor package during operation. The connector thread size is 1/4 FPT (1/4” Female National Pipe Thread). The water must meet the specifications provided in the Cooling Water Specifications table in Section 5.2.
  • Page 39 Specifications 5.4 Description of the dewar The dewar is a stainless steel, vacuum jacketed container built for the purpose of storing liquid nitrogen with minimal boil off. The dewar is sealed from the atmosphere so that only nitrogen flowing from the nitrogen generator can enter it. Attached to the dewar are the cold head, low pressure regulator, level indicator/switch, pressure relief valves, burst disk, bleed valve and extraction line.
  • Page 40 Specifications Inlet Coupling The quick connect coupling attached to the regulator is the inlet port for the gaseous nitrogen. The flexible, stainless steel nitrogen line (not shown) attaches to the N inlet coupling. Level Indicator/Switch The level indicator/switch monitors and regulates the amount of liquid nitrogen in the dewar.
  • Page 41 Specifications 5.5 Description of the N generator/filter bank panel The N (nitrogen) generator/filter bank panel consists of a pressure regulator, a series of compressed air filters, a dehumidifier, and a N generator, all attached to a wall mountable panel. The compressed air filters are necessary to remove particulates, moisture and oil from the compressed air supply before it enters the nitrogen generator.
  • Page 42 Specifications Compressed Air Inlet Port The compressed air inlet port is a 3/8” compression fitting attached to the needle valve, if supplied, or the high pressure regulator. The compressed air inlet supply connects to this fitting. Water Filter The water filter removes condensed moisture and particulate matter from the compressed air supply.
  • Page 43 Specifications (Nitrogen) Generator The N generator uses membrane technology to produce 98% pure nitrogen gas from compressed air. Nitrogen passes through the membrane while the other constituents of air are separated out and returned to the atmosphere through the nitrogen generator’s vent.
  • Page 44 Specifications 5.6 Description of the air compressor The standard air compressor, if supplied by Cryomech, is a two stage, pressure lubricated compressor with a horizontal receiving tank. The air compressor supplies the generator/filter bank panel with the required compressed air flow rate and pressure necessary to produce 98% pure nitrogen gas.
  • Page 45 Specifications Inlet Air Filter The inlet air filter removes dust and particulates from the ambient air before it enters the air compressor’s compression chamber. The filter element is replaceable. Oil Pressure Gauge The oil pressure gauge displays the pressure in the air compressor’s oil lubrication circuit. Oil Filter The oil filter traps contaminants in the air compressor’s lubrication oil.
  • Page 46 Specifications 5.7 Description of the refrigerated air dryer (option) The optional refrigerated air dryer removes moisture from the compressed air stream before it enters the N generator/filter bank panel. The dryer operates automatically and requires periodic maintenance. The manufacturer’s user manual is included with the dryer.
  • Page 47 Specifications Dewpoint Indicator The dewpoint indicator provides a visual indicator of the compressed air’s dew point. Condensate Drain Line The condensate drain line is a plastic tube that carries away the moisture removed from the compressed air. Inlet Air Port The inlet air port is a 3/8”...
  • Page 48 Specifications 5.8 Description of the electrical protection device (option) The optional electrical protection device (EPD) is designed to protect against phase loss (single phasing), phase reversal (incorrect sequence), unbalanced voltage (unequal phase to phase voltages), high voltage, low voltage, and short cycling. If any of the above mentioned faults occurs, the EPD will shut the helium compressor down.
  • Page 49 Instructions on how to read and/or clear the fault memory are printed on the EPD. The five adjustable settings on the EPD have been preset and tested at the factory. Cryomech does not recommend changing any of the settings. The settings are as follows: UNBALANCE – 2.8% TRIP DELAY –...

  • Page 50: Installation

    Section 6 Installation 6.1-N...
  • Page 51 Installation Section 6: Installation 6.1 System installation The entire section on the installation of the liquid nitrogen plant should be reviewed before installing the system. CAUTION Failure to follow these installation guidelines could result in voiding the warranty. The liquid nitrogen plant should be located in a well ventilated area. The ventilation is necessary for proper cooling of air cooled helium compressor packages as well as to disperse the oxygen that is released from the nitrogen generator during operation.
  • Page 52 Installation 6.2 Dewar installation • Confirm that the physical space containing the dewar has an ambient temperature in the range of 45 to 100°F (7 to 38°C). • If the dewar is installed in an enclosed, confined space, an oxygen monitor/alarm should be installed to protect against a deficient oxygen level.
  • Page 53 Installation • Locate the helium compressor package within 10 ft (3 m) of the dewar. If greater separation is required, longer helium flex lines, as well as a longer dewar cord, will be needed. • Position the helium compressor package so there is sufficient space around it for changing the adsorber.
  • Page 54 Installation 6.3.3 Connect the helium compressor package to the main power CAUTION A voltage deviation of more than 10% above or below the voltage rating can cause compressor motor overheating and possible failure. Indications of operation outside that voltage range will void the compressor warranty. 1) The system MUST be connected to a dedicated circuit breaker.
  • Page 55 IMPORTANT When connecting or disconnecting the flex lines, Cryomech recommends using a small amount of Teflon spray lubricant. A can of lubricant is included with each system. Before using the lubricant, you must read the instructions for its use.
  • Page 56 Installation Turn this wrench Hold this wrench Figure 6-1: Connecting the flex lines to a helium compressor package 5) Connect the other end of the helium flex line to the low-pressure port on the cold head. The low-pressure port is marked “Low.” Tighten the connector until a positive stop is felt.
  • Page 57 Installation 6.3.5 Connect the dewar cord 1) Note that the female plugs attached to each end of the dewar cord are unique for both the compressor and the dewar. 2) Assure that the dewar cord is sufficiently long to reach the dewar. If the cord length is not sufficient to reach the dewar, adjust the location of the helium compressor package or the dewar.
  • Page 58 Installation The filter bank's ability to remove water from the incoming compressed air is dependent on the temperature of the incoming air. The incoming air must be cool enough to allow the water vapor to condense. Once condensed, the first two filters will remove it. As a rule, the incoming compressed air temperature should be within 10°F (6°C) of the ambient temperature for optimal operation of the compressed air filter bank.
  • Page 59 Installation 6.5 Refrigerated air dryer installation (option) If the optional refrigerated air dryer is not supplied with the system, proceed to the next section. If the optional refrigerated air dryer is supplied with the system, follow the installation instructions in the manufacturer’s user manual and appendix. CAUTION The refrigerated air dryer must be installed and operated according to the manufacturer’s specifications included in the dryer’s instruction manual.
  • Page 60 Installation 6.6 Air compressor installation The air compressor, if supplied by Cryomech, should be installed according to the manufacturer's specifications included in the air compressor's instruction manual. The manufacturer’s instruction manual is included with the air compressor. Proper installation and mounting of the air compressor is crucial to the safe operation and longevity of the equipment.
  • Page 61 Installation 6.6.4 Connect the air compressor to the main power CAUTION A voltage deviation of more than 10% above or below the voltage rating can cause motor overheating and possible failure. Indications of operation outside that voltage range will void the compressor warranty. 1) The air compressor MUST be connected to a dedicated circuit breaker.
  • Page 62 3) If the rotation is correct proceed to the next section. 4) Single Phase Air Compressors Only: If the rotation is incorrect, contact Cryomech. 5) Three Phase Air Compressors Only: If the rotation is incorrect, perform the following steps to reverse the direction of the motor: a) Make certain the dedicated circuit breaker is off to prevent electrical shock.
  • Page 63 50 ft (15 m) roll of 3/8” OD copper tubing supplied with the air compressor. To aid in the cooling of the compressed air and condensing the moisture entrained in it, Cryomech recommends using the entire length of copper tubing to connect the air compressor to the N generator/filter bank panel.
  • Page 64 Installation CAUTION The filter bank's ability to remove water from the incoming compressed air is dependent on the temperature of the incoming air. As a rule, the incoming compressed air temperature should be within 10°F (6°C) of the ambient temperature for optimal operation of the compressed air filter bank.
  • Page 65 It is fitted with a power cord that attaches to the front panel of the helium compressor package. Make certain the power cord is long enough to reach the front panel receptacle on the helium compressor package. Please contact Cryomech if a longer power cord is required.
  • Page 66 Installation Electrical Protection Receptacle Figure 6-8: Electrical protection receptacle (representative view) Push the plug onto the connector and turn the locking ring clockwise until snug. To disconnect the plug, reverse the procedure. The system will not start if the EPD is not connected to the helium compressor.

  • Page 67: Operation

    Section 7 Operation 7.2-N...
  • Page 68 Operation Section 7: Operation 7.1 Starting the refrigerated air dryer (option) If the optional refrigerated air dryer is not supplied with the system, proceed to the next section. Before starting the dryer, make certain the installation was carried out according to the instructions given in this manual and the manufacturer’s manual.
  • Page 69 Operation 5) Check the oil pressure gauge. On start up, normal pressure is the range of 25 to 30 PSIG. A pressure of 20 to 25 PSIG will be maintained after the compressor has run for a period of time. 6) Check the receiver/tank pressure gauge for a steady increase in pressure.
  • Page 70 Operation 8) Check the N generator/filter bank panel for air leaks. 9) Make certain there is a flow of air out of the N generator’s vent. 10) Check the pressure gauge on the dewar. The gauge will slowly increase to a final pressure of approximately 7 PSIG.
  • Page 71 Operation the preset amount of open time. See Figure 7-2. Valve closed time setting: Minimum 1.0 minute Manual override switch Maximum 45 minutes Valve open time setting: Minimum 1.0 second Maximum 15 seconds Figure 7-2: ADV manual override switch 7.4.2 Startup procedure CAUTION Running the compressor package in reverse for any significant length of time will void the warranty.
  • Page 72 Operation 4) Reset the memory by rotating the Selector to the “Clear Memory” position for 5 seconds. All three yellow indicators should go off if the input power is correct. 5) Return the Selector to the “Auto Restart w/Delay” position. 6) Check the line voltage if the Over Voltage or Under Voltage indicators are still lit.
  • Page 73 Operation 7.5 Normal operation behavior On initial start up, with the entire system at room temperature, normal helium compressor pressures are in the range of 70 to 85 PSIG (4.8 to 5.9 bar) on the low pressure gauge and 290 to 320 PSIG (20 to 22.1bar) on the high pressure gauge. When operating properly, the cold head will emit a rhythmic squeak or chirp approximately 144 times per minute for 60Hz systems or 120 times per minute for 50 Hz systems.
  • Page 74 Operation 7.6 Extracting liquid nitrogen WARNING Before extracting liquid nitrogen from the dewar, carefully read the following safety precautions. Improper handling of liquid nitrogen may result in serious injury or death. • Transferring and handling liquid nitrogen can be extremely hazardous if the proper precautions are not taken.
  • Page 75 Operation vacuum jacketed to minimize boil off losses when transferring liquid as well as helping to protect the operator from coming in contact with extremely cold surfaces. WARNING The operator should be outfitted with the recommended personal protective equipment outlined above before extracting liquid nitrogen. Remove liquid nitrogen by opening the valve on the extraction line.
  • Page 76 If the dewar pressure gauge shows a pressure greater than 15 PSIG, disconnect the nitrogen flex line from the low pressure regulator and relieve the pressure through the bleed valve. The problem must be diagnosed and corrected immediately. Contact Cryomech if the cause of the over-pressurization is not determined.
  • Page 77 To shut down the air compressor, switch its dedicated circuit breaker off. 7.9 Disassembling the system for transport or storage Use the following steps to prepare a Cryomech Liquid Nitrogen Plant for eventual transport or storage. Assure that all components are stored in appropriate containers and location.
  • Page 78 IMPORTANT When connecting or disconnecting the flex lines, Cryomech recommends using a small amount of Teflon spray lubricant. A can of lubricant is included with each system. Before using the lubricant, you must read the instructions for its use.
  • Page 79 Operation Hold this wrench to prevent the cold head’s Aeroquip from loosening. Turn this wrench Figure 7-7: Disconnecting flex lines from a cold head 3) Install the dust plugs (that originally came with the system and are stored in the tool kit) on the female Aeroquip®...
  • Page 80 Operation 7.9.5 Refrigerated air dryer (option) 1) Turn the power switch off. 2) Disconnect the cord from the power source. Coil up the power cord in preparation for transport or storage. 3) Disconnect the copper tubing from the inlet and outlet ports. 4) If applicable, disconnect the drain line from the condensate drain tube.
  • Page 81 Operation 7.10 Troubleshooting 7.10.1 Helium compressor will not start Helium compressor will not start. SYMPTOM POSSIBLE 1) No power supplied to the helium compressor. CAUSE 2) Circuit breaker off. 3) Power switch depressed with dewar cord unplugged. 4) Pressure switch tripped. 5) Temperature switch tripped.
  • Page 82 Operation 7.10.3 System has shut itself down. Helium compressor’s power switch light and dewar standby light both off System has shut itself down. Helium compressor’s power switch light SYMPTOM and dewar standby light both off. 1) Circuit breaker tripped. POSSIBLE CAUSE 2) Interruption of the power supply to the helium compressor.
  • Page 83 Operation 7.10.5 Moisture present in the carbon filter and/or the after filter Moisture present in the compressed air filter bank’s carbon filter SYMPTOM and/or after filter. POSSIBLE 1) Automatic drain valve not functioning. CAUSE 2) Automatic drain valve timer not properly set. 3) Vaporous moisture entrained in compressed air supply.
  • Page 84 Operation 7.10.7 Electrical protection device tripped Helium compressor will not start. SYMPTOM 1) Electrical protection module is in a fault condition. POSSIBLE CAUSE 2) Electrical protection module is in a time delay mode. REMEDY 1) Open the enclosure door and visually inspect the electrical protection module.
  • Page 85 Operation 7.10.8 Moisture has entered the dewar A. The level indicator reading fluctuates. SYMPTOM B. The level indicator not reading the actual volume of liquid. C. The dewar is under vacuum or when extraction line opened, vacuum is felt rather than pressure. POSSIBLE 1) Not purging the dewar before the initial startup.
  • Page 86 Operation 7.11 Contact Cryomech with Questions It is hoped that the Operation Section of this manual has helped you to obtain satisfactory results in the use of your Liquid Nitrogen Plant. While the information offered should facilitate set up and operation, you may have a special situation that requires further considerations.

  • Page 87: Routine Maintenance

    Section 8 Routine Maintenance 8.1-N...
  • Page 88 Please adhere strictly to the maintenance schedule of the entire system. Cryomech recommends keeping a detailed maintenance log. For more detailed information please contact Cryomech.
  • Page 89 Routine Maintenance 8.3 Cold head CAUTION Service to the cold head must be performed using Cryomech parts and the appropriate work instruction. CONTACT CRYOMECH IF THE COLD HEAD NEEDS SERVICING. 8.4 Helium compressor adsorber replacement Required tools - CP800 Series Compressors...
  • Page 90 7) Loosen and disconnect the hose clamp that attaches the adsorber to the front panel. 8) Remove the adsorber from the compressor package. 9) Check the Aeroquip® couplings for oil residue. If oil is present, contact Cryomech for further assistance.
  • Page 91 Routine Maintenance CAUTION Venting more than 5 PSIG (.34 bar) of helium per minute will lead to improper oil migration within the system. If this condition occurs, factory service will be required. This procedure should only be used to vent small quantities of helium from an overcharged system.
  • Page 92 Routine Maintenance Service Valve Service Aeroquip® Coupling Charging hose Figure 8-2: Service valve and access port 3) Attach a charging line from the service Aeroquip® to a typical vacuum/charging system as shown in Figure 8-3 and Figure 8-4 below. Helium Tank Valve  High Pressure Regulator ...
  • Page 93 Routine Maintenance Line to Helium  Vent Valve  Tank  Vacuum  Sending Unit  Relief Valve Vacuum Valve  Charging Lines  Service  Aeroquips  Figure 8-4: Close up of vacuum/charging manifold and pump 7) Evacuate to 50 microns. 8) Isolate the vacuum pump and add 50 PSIG (3.4 bar) of helium. 9) Vent the helium and repeat steps 7 &...
  • Page 94 Routine Maintenance 8.7 Replace air filter (CP900 air cooled compressors only) 1) Lift the air filter access panel, located on the front of the compressor package, to gain access to the air filter. 2) Pull the air filter out. 3) Slide in a new air filter making sure the air flow arrow on the filter is pointing up. 4) Close the access panel.
  • Page 95 • Solvents should never be used. • If any grease or oil gets on the Aeroquip® coupling, contact Cryomech. 8.10 Replaceable fuses 8.10.1 Helium compressor See the Fuse Specifications table in Section 5 for the ratings and characteristics of all replaceable fuses in the helium compressor.
  • Page 96 Helium flex lines The helium flex lines must be handled with care. If they become damaged and need to be replaced, new ones must be obtained from Cryomech and installed using the directions in the installation section of this manual.
  • Page 97 Routine Maintenance See Section 8.4 for instructions on replacing the adsorber. Cold head Service to the cold head must be performed using Cryomech parts and the appropriate work instructions. Contact Cryomech if the cold head requires service. Main power cord If the power cord becomes damaged, a replacement should be obtained from Cryomech.

  • Page 98: Appendix

    Appendix Spray Lubricant Instructions...
  • Page 99 Failure to follow these instructions will cause performance degradation and will void the warranty on your system. The purpose of this work instruction is to document the proper use of TFL-50® Dry Lube on Cryomech systems with Aeroquip® connectors. Related documents and work instructions: TFL-50® MSDS Connection, Installation 1.
  • Page 100 Appendix b. Make certain the flat gasket is properly seated in the male Aeroquip®. Flat Gasket Figure A-2: Cleaning the male Aeroquip® 2. Thread the female Aeroquip® onto the male by hand, until tight. Figure A-3: Female to male connection, hand tightened CAUTION Never apply lubricant to the open ends of the Aeroquips®.
  • Page 101 Appendix Figure A-4: Typical amount of lubricant 4. Apply a small amount of TFL-50® to the swivel portion of the female Aeroquip®. Swivel portion Figure A-5: Apply lubricant to swivel portion 5. Apply a small amount of TFL-50® to the threaded portion of the male Aeroquip®. Threaded portion Figure A-6: Apply lubricant to threaded portion 6.
  • Page 102 Appendix Disassembly 1. Apply a small amount of TFL-50® to the swivel portion of the female Aeroquip® as shown in Figure A-5. 2. Use wrenches to loosen and remove the Aeroquips® (see manual for instructions). 30Jan07...

Table of Contents