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Operation and Maintenance Manual ULTRA‐FREEZE® Liquid Nitrogen Cryogenic Freezer For service or support, please call: Manuf. for: RS CRYO EQUIPMENT, INC. Model: 629 Grove Street Size: Manteno, IL 60950 Phone: (866) 305‐1300 Serial No: Fax: (708) 946‐3251 http://www.rscryo.com Date: ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 1. General Overview This manual describes the installation and operation of ULTRA‐FREEZE® tunnel freezers using liquid nitrogen. The installation described herein comprises the cryogenic storage system, the supply pipes, the application‐specific installation, as well as auxiliary equipment and accessories. The information applies to the various models such as those with 30” wide or 48” wide conveyor belts, single pass and three tier freezers, as well as those with optional variable speed fans. When necessary for clarification, special comments will be included for a specific variation. 1.1. INSPECTION ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 2. Safety Precautions To ensure your safety, and the safety of those around you, carefully read through the safety precautions in this section. 2.1. SAFETY CONSIDERATIONS BEFORE OPERATION The ULTRA‐FREEZE® freezer has been designed to operate in as safe a manner as possible with an exhaust system to assure the efficient removal of nitrogen gas. It is emphasized that the room in which the freezer will be installed shall be large enough and have sufficient air changes, preferably with high and low level ventilation, to prevent a build‐up of nitrogen ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 2.3. SAFETY DEVICES The ULTRA‐FREEZE® is equipped with several safety devices, designed with the operator’s safety in mind. The following is a list of engineered safety controls. Oxygen Level Interlock The ULTRA‐FREEZE® is equipped with an optional oxygen interlock that is tied into the emergency stop loop. An oxygen monitor with a beacon and an audible alarm should be purchased to monitor the oxygen ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 2.4. LIQUID NITROGEN HAZARDS Inform all personnel about the potential hazards related to the use of liquid nitrogen in chilling equipment! COLD BURNS: The freezer operates on liquid nitrogen, which can reach temperatures as low as –196 °C/ –320.8 °F. Physical contact with the liquid nitrogen can cause cold burns and tissue damage. Avoid any direct contact with liquid nitrogen or mediums/metal in direct contact with liquid nitrogen by wearing suitable safety gear (safety glasses, facial shield, long‐sleeved clothes, long pants, appropriate thermal insulated gloves). The surface of the product leaving the freezer is at sub‐zero temperature and should not be handled without sufficient protection. This also applies to the internal surfaces of the freezer when just opened. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 3.2. THE ULTRA‐FREEZE® PROCESS The three basic principles of the Ultra‐Freeze® process are: The use of fans to circulate the cold gases at high velocity Accurate control of temperature Belt speed control to set required “time exposure”, or “tunnel dwell time” The ULTRA‐FREEZE® process utilizes the “wind chill” effect to increase the freeze rate for products. The high velocity gas flow created by the circulating fans, continually removes the thin insulating envelope of static gas that normally surrounds the product to be frozen. This allows the super cold nitrogen gases to be in very close contact with the surface of the food product. The rapid freeze achieved by the high velocity gas flow reduces product shrinkage and moisture loss, as well as maintains final quality of the product. The liquid nitrogen from the injection nozzles is rapidly converted to cold gas due to absorption of the heat introduced by the food product. The secret to the efficient operation of the ULTRA‐FREEZE® tunnel is accurate temperature control of the modules and constant uninterrupted injection during the processing period. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® attached to the modules are anchored to the inner steel framework through the use of threaded rivet type fasteners. The fiberglass parts are high strength hand lay‐up molded fiberglass parts, coated with a USDA accepted food grade gel coat. All joints in the fiberglass are on the outside surfaces where they are not subject to temperature shocks or expansion and contraction. The doors are insulated with foam‐in‐place closed cell polyurethane foam for high insulating value and high structural strength. The module is insulated with staggered layers of preformed polyurethane foam to allow for minor expansion and contraction. There are no direct metal heat conduction paths to the outside of the freezer. The door gaskets are preformed ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® WARNING! Do not manually override the brake, or injury could occur due to someone reaching inside the module before the fan stops rotating. Variable speed fan freezers do not have brakes. The 1/2HP 1200 rpm motors also stop almost instantly by using electric dynamic braking. Whenever any upper door is raised, the safety limit switch will shut all circulating fan motors off, as well as cryogen injection in the freezer. WARNING! If electrical power is shut‐off to controller, or if fan stop button is pushed while fans are rotating, there is no effective electronic braking. Therefore, the fans will coast to a stop and may still be rotating even with the doors open. 3.6. CONTROL PANEL The freezer controls are conveniently located on the front panel of the NEMA 12 rated control cabinet. The controls are the following: 1. Main motor disconnect switch handle (230 VAC, 3 phase, 60 Hz) 2.
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 3.7. INJECTION HEADERS Each assembly feeds the cryogen through the bottom of the apparatus box down into the center of a freezer module. Each drop can control injection of LN2 into either one or two modules through the use of extension headers. A single module drop supplies liquid nitrogen to the right or left side extension piping with cross pipes of nozzles to be fed from both sides with liquid. The nozzles are threaded into the cross piping for replacement with plugs where nozzles are not required. Nozzles are added, or removed and replaced with pipe plugs, to control the total amounts of liquid nitrogen injected into the modules. Those drops that require the use of extension headers have piping run to either the preceding or following module with a duplicate header system in those modules. For optimal freezing capacity, the ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 4. Installation & Assembly 4.1. SITE SELECTION REQUIREMENTS The installation site of the ULTRA‐FREEZE® must meet the following requirements for safe operation: Located in close proximity to the Liquid Nitrogen (LN ) tank or vessel. Supply Voltage/Frequency: 460 or 230 VAC+ Ground, 3 phase, 60Hz Located in a large, well ventilated room The exhaust duct piping from the ULTRA‐FREEZE® must run outside in order to ensure removal of the N gas from the processing room. Note: Avoid exhausting to outside areas where people typically congregate (e.g. break areas, smoke areas, etc) Rooms underneath the installation site must be adequately ventilated. Warning or hazard signs are posted around the freezer for safety purposes are highly recommended. CAUTION: Keep Nitrogen gas out of lower lying spaces, channels and shafts. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® Overall freezer dimensions, in‐feed height, exit height, etc. can be found in Section 3.1 ‐ Equipment Specifications. Utilize this data to make height adjustments of freezer and/or processing line equipment. 4.2. UNLOADING THE ULTRA‐FREEZE® Professional riggers are recommended when unloading the freezer. Professional riggers have the experience and equipment to unload the freezer and move it into the desired location in minimal time. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 4.4. CONNECTING FREEZER SECTIONS AND SEALING A) Move the freezer sections into their proper relative positions on the floor (the exit vestibule has the drive motors mounted on its sides). The module crates are designed to be moved by fork lift or pallet trucks and can be rolled or skidded. Lifting should be done only along the 2x10’s that form the perimeter of the crate. DO NOT lift the upper 2x4’s on the trusses. B) Check with the wiring diagrams to determine proper placement of each crate before assembly (for 2 and 3 module tunnels proceed to step J). C) Uncrate the first section to be assembled. Each module end needs to be fully supported before completely removing the lower 2x10 support braces. Screw down the adjustable plastic pedestal legs to meet the floor and raise the modules off the crating slightly before removal. D) Attach the end pedestal to the module just uncrated, unless it was shipped that way. E) Push the second group of modules up to the end of the first and uncrate the end only. The first module of the second crate should be positioned to extend about 2” onto the exposed pedestal half mounting surface. F) Uncrate the modules. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 4.5. INSTALLATION OF THE CONVEYOR BELTS Set the box containing the conveyor about 18” from the exit end of the freezer and line up the conveyor belt with the sprockets on the bottom conveyor shaft. If the belt is rolled, it will be necessary to unroll the belt and restack it as folded pile for easier installation. NOTE: Three tier freezers have three precut conveyors, each of a different length. The longest is the top belt; the shortest is the middle belt. Make sure the proper one is selected for each conveyor. Carefully check the orientation ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® clearance height. Check the clearance between door and the module frame as well as gasket fits. The module can be twisted slightly if the leveling screws are not properly adjusted causing the doors to bind. The exhaust troughs should be installed as soon as the machine is leveled so that the sheet metal contractor can install the exhaust piping and blowers (see Section 6 – Auxiliary Connections). 4.7. EXHAUST TROUGH AND BLOWER The exhaust troughs should be installed as soon as the machine is leveled so that the sheet metal contractor can install the exhaust piping and blowers. If a trough ends up supporting the weight of the ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 5. Auxiliary Connections To ensure proper supply connections, take into account any restrictions as provided in Appendix B – Reference Drawings when designing the supply connections. To allow for proper installation once the freezer is in place, make sure the following is made available at the in‐plant freezer location: provisions for electrical power supply and connection; provisions for LN supply and connection; provisions for proper installation and connection of exhaust duct; floor drains and corresponding floor pitch as required for drainage of cleaning water. The liquid nitrogen piping and electrical conduits should be well protected against accidental damage. To minimize liquid nitrogen consumption, avoid elbows where possible and ensure piping runs are as short and direct as possible. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® of the controller and shielded wire should be as remote as possible relative to any AFC generating unit controller to prevent pick‐up of RF noise. Six inches is too close. 1. Earth Ground – Earth ground must be attached to the unit’s chassis to make it noise free 2. Neutral – It is necessary to assure that neutral is at, or near, ground potential. A voltmeter check between neutral and ground should show no more than 50 millivolts. In Conduit, Pipe or EMT A. Control wires (115V) and power wires up to 600 volts (including DC) can be contained in the same conduit unless specified otherwise by local code regulation! This conduit terminates on a designated apparatus box, usually the number 1 module. B. Signal wires for the RTD temperature probes (very low voltage and amperage). In our case, this is the 3‐wire shielded cable which must be run in its own conduit. Each conduit should originate from ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® It is recommended that the LN ‐supply line is purged before final hook‐up to the freezer by opening the main supply valve at the tank slowly. Purge the LN ‐line for approximately 30 seconds, and then close the main supply valve. 5.3. EXHAUST SYSTEM INSTALLATION The freezer exhaust system, if properly installed and tuned, will ensure an efficient removal of all superfluous nitrogen gas. IMPORTANT: Air Liquide highly recommends the use of Oxygen monitoring systems in any room that utilizes nitrogen. Please contact your local Air Liquide ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® Importance of Vapor Balance A correct vapor balance is related to the amount of gas flowing out of the freezer. If properly adjusted, only a small amount of nitrogen gas will arrive in the production area. This slight spill of gas ensures that no room air is drawn into the ULTRA‐FREEZE® freezer. Room air can bring moisture into the freezer, therefore affecting the efficiency and economical operation of the freezer. - 20 - Rev 0 ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 6. Initial Start‐up and Tuning The ULTRA‐FREEZE® was factory tested before delivery. All efforts have been made to simulate the operating conditions when testing and calibrating the freezer. However, operating conditions may vary once the ULTRA‐FREEZE® freezer is installed, therefore requiring fine‐tuning of the equipment. The guidelines presented here should help during initial start‐up/tuning of the freezer. 6.1. PRE‐STARTUP CHECKLIST 1.
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 6.2. INITIAL START‐UP 1. Clean the ULTRA‐FREEZE® thoroughly, prior to the initial start‐up. Refer to Section 8: Cleaning for detailed information. Normally, the ULTRA‐FREEZE® doors are left in the open position after cleaning, to continue drying overnight. 2. Turn the main disconnect switch into the ON position. 3. Check that all of the door limit switches are working properly. Limit switches are wired normally open (NO) so fans should only energize if the doors are closed. Alternately open each upper module door and check for proper operation of safety fan shut‐off switches. Adjust as required. Do not operate the freezer unless all safety door switches ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 6.3. LN INJECTION – TUNING AND ADJUSTMENT System Description The LN injections system in a freezer has one, two or three injection header bars in each module (except for the end module). A typical freezer requires no more than two to three bars per module to properly freeze the product. Hot or cooked product may require larger nozzles in the first few modules in order to be able to maintain the desired set point temperature. Because of these variable parameters, the ULTRA‐FREEZE® has a system to “tune” or adjust the LN2 flow rate that is required for ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 6.4. INJECTION SYSTEM TUNING PROCEDURE Preliminary Settings 1. Set the ball valve in the apparatus box for each LN2 drop to maintain approximately 80% of the upstream gauge reading on the downstream gauge (AMBER light on only). 2. At full production runs, the RED light should be on 50% of the time. Final Settings 1. Cool down the freezer. It should reach operating temperature in 30 to 45 minutes. If a morning line vapor dump valve is added, the cool down time can be reduced to 5 or 10 minutes. 2. Set the temperature controllers on the control cabinet to ‐125°F or the required set point freezer temperature. 3. Load the freezer at the expected production capacity. Monitor the lights on the temperature controllers. The RED light should be on at least 40‐60% of the time. If the RED rarely or never ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® The liquid nitrogen is converted into a mist (water‐like droplets) by the spray nozzles. The available cooling from the LN2 is achieved by the droplets expanding from the heat of the product and vaporizing to a gas. The remainder of the cooling is gained by warming the resulting cold gases to the exhaust gas discharge temperature. Even though LN2 is ‐320°F at the nozzle, we prefer to control the temperature in the freezer to no colder than ‐180°F for the prevention of damage to equipment, efficient economics and safety to personnel. The high velocity circulating fans in the ULTRA‐FREEZE® promote the rapid cooling and best efficiency of the cryogen. All the circulating fans must be operating; otherwise the high velocity gas will not repeatedly pass the cryogen over the product to enhance the cooling effect. If the product being frozen ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® Variable speed fans – This option provides another control for the freezer operator. A standard fan speed setting can be established for light weight or heavy items to take advantage of the heat transfer improvement contributed by velocity of the cold LN2 vapor circulating over the product. Setting the fan speed too high can cause products to move off of the belt, potentially jamming the belt ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 7. Operating Instructions 7.1. IMPORTANT OPERATING AND MAINTENANCE POINTERS The following synopsis is intended to be a handy reference of specific, important, Operation, Cleaning, and Maintenance Factors, requiring most frequent attention. However, familiarity and understanding of the detailed explanations and descriptions in the manual is essential. Operation 1. Temperature setting must not be lower than ‐205°F 2. Develop a procedure for temporary shutdown of freezer Cleaning 1. Cover motors and control cabinet to protect them from splash water. Uncover motors to run fans or conveyor. 2. Do not abuse door gaskets 3. Dry out freezer as well as possible after clean‐up. Leave all freezer doors open between shifts. Maintenance 1. Check if all fan motors are running daily 2. Check adjustable baffles for free action daily 3. Check solenoid valve operation at least weekly 4. Check conveyor belt slack frequently 5. Change conveyor drive gear box oil as specified ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 2. Open the manual shut‐off valve (main valve) of the LN ‐supply at the storage tank if it is not already open. 3. Close and latch all module doors. Check for loose tools or parts on conveyors. 4. Close all exhaust trough cleanout doors and replace cleanout caps on exhaust ducts. 5. Close and install all entry and exit covers and curtains. 6. Turn the main disconnect to the ON position. It is recommended to leave the disconnect switch on constantly. This keeps the field windings of the DC conveyor drive motors warm to prevent burnouts and moisture damage. 7. START the exhaust blowers. Check for proper operation. Adjust the exhaust flow if required. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 17. Start loading food product. Adjust the flow rate of the exhaust system to ensure only the required minimum of nitrogen vapor is coming out of freezer (correct vapor balance). 18. Check the temperature and condition of the food coming out of the freezer. Make one or more of the following adjustments if required: a. belt speed b. production rate c. nitrogen throttling valve (HV‐201) 7.3. PRODUCTION INTERRUPTIONS Shutdown of the freezer for relatively short production interruptions such as breaks, lunch period or production ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 7.5. PRODUCT TEMPERATURE EQUILIBRATION Equilibration is the process of equalizing the temperature of the center and outside of the product. This occurs with time; the amount of time depending on the thickness of the product. When a product is frozen in a cryogenic freezer, a frozen crust will quickly form on the outside surface, and this will become thicker and colder with time. The center of the product will freeze last, and there will be an appreciable difference in the temperature of the outer shell and the center of the product. If a product is to be frozen to X° at the core, it is evident that the product need not reach X° at the core in the freezer. There will be a point that can be determined by trial, at which the frozen outside shell will be thick enough and cold enough to absorb the remaining heat in the core wo the entire mass equilibrates to the required X°. When the frozen product is quickly packed together after discharge from the freezer, there is little loss of the refrigeration in the frozen shell. Equilibration occurs in the package where the refrigeration of all pieces compliments each other. - 30 - Rev 0 ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 7.6. SHUTDOWN At the end of a production shift, the freezer should be shut down in the following sequence: 1. Stop loading food products. 2. Wait until all food products have exited the ULTRA‐FREEZE®. 3. Turn OFF the Instrument power. 4. To defrost, run all fans and the conveyor for a while until the bottom doors open easily. Open the bottom doors and let the freezer defrost for 10 to 15 minutes. IMPORTANT: Open doors cautiously to prevent damage to the door gaskets. If it is evident that the door gaskets are frozen to the module, the freezer should ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 8. Cleaning 8.1. PRE‐CLEANING CHECKLIST Safety Precautions Before cleaning the ULTRA‐FREEZE®, the following safety precautions should be considered to prevent personal injury or damage. Close and properly secure all electrical enclosures and conduit covers on the freezer and those in the cleaning area. Protect electrical components from water/moisture damage with plastic bags, if possible. Wear gloves and safety glasses to avoid personal injury from high‐pressure hot water or steam jets. Remove or secure loose fitting clothing to prevent them from being caught in moving freezer components during clean up. Equipment and Products Required To properly clean the ULTRA‐FREEZE®, provide the following equipment and cleaning products: steam hose for high pressure cleaning; air hose for high pressure cleaning and drying; food‐safe detergents compatible with stainless steel, Teflon and polyester ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 5. Hose down the interior of the freezer with the conveyor running. Plastic bags must be removed from conveyor motor(s). Give particular attention to the sills under the conveyor belt where the modules join and along the door gasket strips. 6. The moving conveyor belt can be scrubbed and hosed down at the exit or entry end. 7. The design of the freezer allows wash water to drain out of the freezer freely. 8. To assist in drying out the inside of the freezer and to blow clinging water from the conveyor belt, close all upper doors, open all lower doors, and run the conveyor and all fans for about 1/4 hour. The plastic bags must be removed from the fan and conveyor drive motors at any time during operation. 9.
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 9. Maintenance This section provides information for corrective and preventive maintenance of the various subsystems of the ULTRA‐FREEZE®. For maintenance of specific more specific information, the appendices and other sections should be consulted. For more specific information about the equipment components, please refer to the manufacturers’ literature in Appendix C – Component Manuals. Care should be taken when performing maintenance on the freezer. The following safety considerations are listed to protect you from injury: Maintenance should only be performed by qualified personnel. Always de‐energize the control panel before opening and working on any components inside. Follow Lock Out Tag Out (LOTO) procedures where applicable. Isolate the cryogen by closing the shutoff valve at the tank and the shutoff valve at the freezer (HV‐100). Bleed any excess nitrogen trapped between the valves with a bleed valve. It is not good practice to use the safety relief valve as a bleed valve. Remember to replace all guards after performing maintenance. 9.1.
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 9.3. CONVEYOR AND CONVEYOR DRIVE Conveyor Belt Inspect the belt daily for the first several days of operations and semi‐monthly afterwards. If local wear is apparent, determine the cause and correct the problem. A tensioning device is in place for the conveyor belt of a single pass freezer, and the top and mid‐ conveyor belt of the three tier design. The slack in the bottom (of 3 tier) conveyor belt at the exit end is the required catenary to compensate for expansion and contraction and needs to take‐up. The conveyor belt will wear in and stretch with use. Therefore, if this slack becomes excessive, it will be necessary to shorten the conveyor belt by removing drive links and cross rods. Too much slack is readily determined by the conveyor almost dragging on the floor of the ext end section when warm, and often by a jerking or hesitation of the travel of the conveyor under power. The 3‐tier freezer has a conveyor belt tensioning mechanism for the top belt and another for the second belt. The slack should be minimized by tensioning with the tensioning devices. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® Conveyor Drive Gear Reducer Change oil after the first 80 hours, 250 hours, and then after every 1,000 hours of operation. Use Mobil 600W cylinder oil or equivalent. Conveyor Drive Chain Grease this chain every three months after installation. Use food compatible lightweight grease. The tension arm must be adjusted to control slack in the drive chain. Check periodically to be sure tension arm is correctly positioned and bolt is tight. 9.4. SAFETY RELIEF VALVES Safety Relief Valves should be located between any two shutoff valves, and changed every 5 years or upon any signs of leakage for preventative maintenance. 9.5. MODULE JOINTS Remove and replace silicone as needed, or when a sanitation issue becomes present. Replace module joint tape when cracked or peeling. ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® Door Seals The door seals or gaskets are precut, spun polyester strips. They are attached with stainless steel hold‐ down strips and screws. Should a gasket become excessively warped, cut, or cracked, allowing vapor leakage, it should be replaced. See Section 11 ‐ Spare Parts List for the specific gasket required. To replace it, remove screws hold‐ down strips and screws. After making sure the gasket guide is clean, install new gasket in its place, with ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® To clean the orifices, remove the nozzle. Probe the orifice in the nozzle with a fine pin and tap the nozzle lightly to remove the foreign material from inside. Replace the nozzle, making sure to point the orifices the same as they were. 9.10. TEMPERATURE CONTROLLER FDC‐4300 Fuzzy Logic plus PID microprocessor‐based controller, incorporates a bright, easy to read 4‐ digit ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® To Replace Fan Shaft Bearing Only Remove fan blade by first loosening the two cross bolts on it. Remove hex cap screw and thrust washer and slide fan blade and key off shaft. Remove the clamping collar. Force flat point of a screwdriver or similar tool in one of the slits in the bearing housing to pry slightly apart. Remove bearing sleeve and bearing. A short bent wire may be helpful to reach up in bearing housing and catch the top of the bearing to pull it out. To reassemble with new bearing, install clamping collar loosely on bearing housing. Insert bearing on the fan shaft and push up in to bearing housing. Grease* the fan shaft holes in the fan blade. Install fan blade with curve “hump” up. Cross bolts and nuts are to be just tight, not forced tight. Tighten set screw in clamping collar after fan blade is mounted. (*refer to Fan Assembly sketch located at the end of Section 4) ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® To Repair Variable Speed Motor or Fan Shaft (Refer to Fan Assembly sketch located at end of the Section) 1. Disconnect power and then disconnect motor electrical cable from inside the apparatus box and free the cable. 2. Remove fan blade by first loosening the two cross bolts on it. Remove hex cap screw and thrust washer and slide fan blade and key off the shaft. 3. Remove the clamping collar. 4. Force flat point of screwdriver or similar tool in one of the slits in bearing housing to pry slightly apart. Remove bearing sleeve and bearing. A short bent wire may be helpful to reach up in bearing housing and catch the top of the bearing to pull it out. 5.
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 10. Trouble Shooting This section helps the maintenance or reliability team troubleshoot the freezer and take the appropriate actions. Additional information on the various components can be found in the appendices. Troubleshooting should only be carried out by qualified personnel. 10.1. ELECTRICAL POWER SUPPLY The ULTRA‐FREEZE® has been designed to operate from a 3‐phase, 60 Hz electrical power supply. Use the electrical schematic in Appendix B – Reference Drawings for more information with respect to the voltage requirements and other specifications. The variation in supply voltage to the freezer should not exceed +10 % to ‐5 % of the nominal value. In case of any operating problems, first check the voltage at the main disconnect switch on the side of the electrical enclosure. 10.2. LIQUID NITROGEN SUPPLY Check if the amount of liquid nitrogen in the storage tank is adequate for the intended operating period. If the product exiting the freezer is not completely frozen, check the position of the LN ‐control valve. If the LN ‐control valve is full open, check the storage tank pressure is sufficient. When the storage tank pressure is lower than the minimum required pressure (20 psi), insufficient quantity of liquid nitrogen will flow to the freezer through the supply piping. The normal operating pressure is 40 psig, but may be ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 10.4. TROUBLSHOOTING TABLE TROUBLE PROBABLE CAUSE REMEDY LN2 vapor flowing over Exhaust blower not operating Check blower and correct cause exhaust troughs or wrong rotation Clogged exhaust pipe or full Check and correct cause blast gate in piping Too much air drawn in from Check curtain. Check directional opposite end of freezer baffle Negative pressure of room Room needs positive pressure (bring in make‐up air) If exhaust (entrance) opening Loosen thumb screw to lower is blocked at top (conveyor, opening by dropping slide plate etc.) adjust Uneven draw across belt Adjust slope baffle at bottom, by (entrance & exit) reversing of changing open draw area Exhaust system failure Check the exhaust system (motor, blades, shaft, etc.) and replace if necessary. Both AMBER and RED lights Over injection of LN2 ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® TROUBLE PROBABLE CAUSE REMEDY freezer curtains Relay or solenoid valve Check relay or solenoid valve. Correct cause or replace item(s), if necessary Temperature indicator Liquid solenoid valve stuck Check for foreign material on valve overshooting open seat. Correct cause or replace parts, if necessary Temperature controller or Refer to Manual on controller. sensing element Check settings, sensing element and its wiring and controller. Correct cause or replace sensing element or controller if necessary Sensor projection too short Extend projection Liquid nitrogen running on Nozzle shooting over edge of Adjust nozzle inwards so that spray floor under freezer conveyor of nozzles are on product or on conveyor area Conveyor will not operate Power supply Check and restore power Electrical short in motor or Check motor and drive controller. drive controller or fuse blown ...
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OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® TROUBLE PROBABLE CAUSE REMEDY Product exits freezer too Freezer not sufficiently cooled Wait a few more minutes before warm at start‐up of down. correcting. production. Steady state not reached. Product residence time too Reduce belt speed. short. No LN ‐injection. Check if all valves are open and working properly. No power at control panel or Main disconnect not switched Turn main disconnect into ON components. on. position. Main fuses failed. Identify cause and replace if required. Power supply of plant failed. Check power supply up‐stream of machine. Product exits freezer too cold. Product residence time too Increase the belt speed. long. Exhaust fan not running Exhaust system not switched ...
OPERATION & MAINTENANCE MANUAL ULTRA‐FREEZE® 11. Spare Parts List The following list of spare parts apply to ULTRA‐FREEZE® Freezers with 30” or 48” wide belts, and 1 or 3 tiers. To obtain spare parts for items not listed below, please contact RS CRYO at (866) 305‐1300. 11.1. MOTOR AND FAN ASSEMBLY PARTS Part Number Part Description 30‐570212 Motor, Fan, 1 HP, 1140 RPM, 230V, 3 PH, 60 Hz (Fixed Speed Only) 30‐570009‐M Motor, Fan, 1 HP, 1140 RPM, 230V, 3 PH, 60 Hz (Variable Speed Only) 30‐570210 Obsolete Brake, Fan Motor (Fixed Fan Speed Models Only) [pre 3/93] 30‐570582 Brake, Fan Motor (Dodge) NEW STYLE as of 3/93 30‐551385 Shaft, Fan 30‐570263 Coupling, Fan Shaft Split (5/8” I.D.) 30‐570354 Bearing, Fan Shaft 30‐550561 Sleeve, Bearing 30‐570303 Fan, Blade P1171 (High Pitch) 30‐570207 Fan, Blade P1179 (Low Pitch) 11.2. CONTROL CABINET PARTS Part Number Part Description ...
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