Thermo Scientific Harris MBF-700 Installation And Operation Manual
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Thermo Scientific Harris MBF-700 Installation And Operation Manual

Thermo Scientific Harris MBF-700 Installation And Operation Manual

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Installation and Operation Manual
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Thermo Scientific
Harris MBF-700
Refrigeration System

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  • Page 1 Installation and Operation Manual ® Thermo Scientific Harris MBF-700 Refrigeration System...
  • Page 2 © Thermo Fisher Scientific. All rights reserved. ® “Suva ” is a registered trademark of DuPont. All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.

  • Page 3: Table Of Contents

    Table of Contents Table of Contents Section 100 – Product Introduction ..........Freezer Overview ................1 General Construction ..............2 Control Panel ................3 Liquid CO2 (LCO2) Backup System .......... 4 Section 200 – Installation And Operation ........17 Installation Check List ..............17 Operator's Responsibilities ............
  • Page 4 Table of Contents LCO2 Vent ................32 Trouble Shooting Guide ............... 32 Contactors And Relays ..............39 Compressor Motors, Three Phase ..........39 Partial Or Complete Loss Of Refrigeration ......... 40 Checking Refrigerant Charge ............40 Installing Gauges ................ 41 Leak Testing, Repairing And Charging –...

  • Page 5: Section 100 - Product Introduction

    SECTION 100 – PRODUCT INTRODUCTION SECTION 100 – PRODUCT INTRODUCTION FREEZER OVERVIEW This unit is a low temperature freezer designed to operate with a chamber temperature in the range of –65 to –85 °C (-85 to –121 °F) and in an ambient temperature range of 15 to 32 °C (59 to 89.6 °F).

  • Page 6: General Construction

    SECTION 100 – PRODUCT INTRODUCTION CAUTION Do not discard the sub lids. They are necessary for the operation of the unit. The refrigeration arrangement employed in this freezer is a specially designed assembly using four hermetic motor compressors. This design is termed a “redundant cascade system”.

  • Page 7: Control Panel

    SECTION 100 – PRODUCT INTRODUCTION CONTROL PANEL All controls are located at the right end of the cabinet Figure 3. Control Panel Detail 1. Key-operated alarm ON/OFF switch. Turns on local audio alarm. 2. Key-operated compressor ON/OFF switch. Turns on power to compressors and control system.

  • Page 8: Liquid Co2 (Lco2) Backup System

    SECTION 100 – PRODUCT INTRODUCTION 7. Alternate system alarm indicator light. “ON” when auxiliary control causing both systems to operate. 8. Heater switch. Operates breaker strip condensate heater. 9. Battery meter. Displays state of battery charge when button is pressed. The remote alarm contacts were developed to provide an alert for an alarm condition.
  • Page 9 SECTION 100 – PRODUCT INTRODUCTION 7. Uncoil the tubing from the control unit and connect to the LCO2 tank or supply connection. 8. Turn on the LCO2 valve. 9. Refer to the Backup System Owners Manual for operation instructions. Note LCO2 backup systems are typically built with a relief valve set for 1,300 PSIG.
  • Page 10 SECTION 100 – PRODUCT INTRODUCTION 2. Place the CO control system on top of the freezer lid. 3. Locate the switch hole in the left hand side of the right hand machine compartment cover and remove the cover plate that was factory installed.
  • Page 11 SECTION 100 – PRODUCT INTRODUCTION Note An uninsulated CO supply cylinder with siphon tube must be provided by the customer. The siphon tube allows liquid CO to be drawn from the cylinder. The supply pressure must be between 600 and 1050 psig. The supply temperature must be between 7 C and 31 C (45...
  • Page 12 SECTION 100 – PRODUCT INTRODUCTION in the back of the control cabinet that match the slots in the back of the control bulb housing. Slip the slots in the housing under the screw heads and tighten. This will hold the housing and bulb securely to prevent damage.
  • Page 13 SECTION 100 – PRODUCT INTRODUCTION Setup and Operation The recorder has been factory-installed, programmed, and calibrated for your new system. Operation will begin when the system is powered on. To prepare the recorder to function properly, you should perform the following steps: 1.
  • Page 14 SECTION 100 – PRODUCT INTRODUCTION Power Supply The recorder normally operates with AC power when the system is operating. If AC power fails the LED indicator flashes to alert you to a power failure. The recorder will continue sensing cabinet temperature and the chart will continue turning for approximately 24 hours with back-up power provided by the 9 volt battery.
  • Page 15 SECTION 100 – PRODUCT INTRODUCTION No. of Flashes Temperature Range Application Option # -40 to +25°C Refrigerators 6*83-7* -115 to+50°C ULT’s 6*83-6* -200 to 0°C Cryogenic 6*83-5* 0 to +60 Newer Units Only ° ° Change program to the “-115 C to +50 C”...
  • Page 16 SECTION 100 – PRODUCT INTRODUCTION COBEX RECORDER TROUBLESHOOTING GUIDE LED Flashing Low Battery Replace with a FRESH 9v alkaline battery. Battery must be new. No AC Power 1. Remove battery. 2. If LED goes out, then no power is getting to the unit. 3.
  • Page 17 SECTION 100 – PRODUCT INTRODUCTION Not Calibrated Calibrate Recorder 1. Push #3. Pen comes off chart. 2. Push #3 again. Pen stops briefly on returning to chart. Stopping point should be at edge of chart. If not perform the following: 3.
  • Page 18 SECTION 100 – PRODUCT INTRODUCTION Pen Goes to Wrong Range 1. Momentarily depress button #3 (“Chart Change” Center button). 2. With pen off chart, hold #1 for 7 seconds. 3. Release. (Note: No range recall). 4. Green LED Flashes. 5. Momentarily depress #1 or #2 to change: •...
  • Page 19 SECTION 100 – PRODUCT INTRODUCTION Pen Not Chart Loose Printing 1. . Tighten chart knob 2. Attempt to turn chart counter-clockwise 3. If chart turns then tighten knob more No Pen Pressure 1. Unscrew pen arm 2. Bend pen arm slightly downward 3.
  • Page 20 SECTION 100 – PRODUCT INTRODUCTION Pen Arm Not Calibrated Oscillating Recalibrate (see “Not Calibrated”) No Recorded No Pen Pressure Line 1. Unscrew pen arm. 2. Bend pen arm slightly downward. 3. Reattach 4. Recalibrate (“Not Calibrated”). Chart Loose 1. Tighten chart knob. 2.

  • Page 21: Section 200 - Installation And Operation

    SECTION 200 – INSTALLATION AND OPERATION SECTION 200 – Do not attempt to operate this freezer until the preceding Installation Check INSTALLATION List steps have been completed AND OPERATION INSTALLATION CHECK LIST Date Initial The freezer is in place. The freezer has been leveled. Check freezer data plate voltage.
  • Page 22 SECTION 200 – INSTALLATION AND OPERATION Frequency Of Description Of Tasks, Observations & Record Keeping Requirements Task Once on first Time required for initial pulldown. If only partial loss of the refrigerant has occurred, the sign ° start will be slow pulldown time required reaching -80 C.

  • Page 23: Water-Cooled Condensing Unit Connections

    SECTION 200 – INSTALLATION AND OPERATION WATER-COOLED CONDENSING UNIT CONNECTIONS CAUTION ONLY QUALIFIED REFRIGERATION TECHNICIANS ARE TO MAKE CONNECTIONS OR ADJUSTMENTS. The MBF700 can be purchased with air-cooled condenser, water-cooled condenser, or both. If purchased with water-cooled condensers, there are two water supply and two water discharge connections to be made at the rear of the cabinet (see Figure 12) if you wish to use the water cooling feature:...
  • Page 24 SECTION 200 – INSTALLATION AND OPERATION The Selector Ball Valve can be accessed by removing the end cover on each of the machine compartments. The valve may be identified by the square wrench flats on its top. The flow-indicating arrow will be perpendicular to the tubing when the valve is closed, and parallel to the tubing when the valve is open.

  • Page 25: Cleaning The Freezer Surfaces

    SECTION 200 – INSTALLATION AND OPERATION CLEANING THE The inside and outside of the freezer are coated with a heat fused epoxy powder finish. It may be cleaned with any non-abrasive cleaner such as hand FREEZER SURFACES dish washing detergent. To prevent odors on the inside of the freezer after cleaning, it is recommended that, after cleaning with detergent, the entire surface be wiped with a clean cloth soaked with a solution of one-half(1/2) gallon of water and one-quarter (1/4) cup of baking soda.

  • Page 26: Section 300 - Theory Of Operation

    SECTION 300 – THEORY OF OPERATION SECTION 300 – THEORY OF OPERATION OVERVIEW The MBF700 utilizes alternately-operating redundant refrigeration systems to maintain -85 °C while extending unit’s life and providing safety in the event of a system failure. The electronic thermostat is backed up by an electromechanical thermostat in case of primary control failure.

  • Page 27: Systems Description

    SECTION 300 – THEORY OF OPERATION Typical Cycle Times at -80°C Setpoint Power Supply Ambient Temperature On Cycle Duration ° 60Hz <27min SYSTEMS DESCRIPTION REFRIGERATION SYSTEMS This freezer is equipped with redundant cascade refrigeration systems. System “A” and System “B” are identical systems and each is capable of maintaining the proper temperatures inside the freezer.

  • Page 28: Safety Devices

    SECTION 300 – THEORY OF OPERATION SAFETY DEVICES (see Figure 7, notes 2,3 & 4) Both first and second stage compressors are protected by an internal pressure relief valve that will rapidly equalize the high and low sides of a given stage in the event of a pressure imbalance greater than ~425 psi.

  • Page 29: Lco2 Backup System

    SECTION 300 – THEORY OF OPERATION selecting the functioning side on the rotary switch on top of the sequencing relay. This will prevent the relay fron alternating sides, and the indicated side will run repeatedly. LCO2 BACKUP SYSTEM (see Figure 10) This fully independent system provides backup cooling in the event both mechanical refrigeration systems become inoperable, possibly due to a power loss.

  • Page 30: Halo Passes

    SECTION 300 – THEORY OF OPERATION The backup unit is powered by 115 VAC, 1 phase, 60 hertz and draws 0.35 amps. Two copper halo passes are installed on the inner wall around the flange of HALO PASSES the freezer shell. Each of these halo passes is independently and directly connected to the discharge line of the first stage compressors of "A"...

  • Page 31: Main Temperature Control

    SECTION 300 – THEORY OF OPERATION operate in the low stage because its characteristics fit well within the general capability of the low stage compressor and those of other related components. The second stage compressor compresses the refrigerant vapor for a high pressure condensing in the interstage heat exchanger. Principle of a High Stage in a Cascade Refrigeration System The cycle of refrigerant in compression, condensing, expansion, evaporating and compression again applies to the high stage of a cascade system.
  • Page 32 SECTION 300 – THEORY OF OPERATION • With the power key switch in the “Off ” position the compressors will not energize. The Primary Temperature Control does not directly cycle between sides, but provides a demand signal when the measured system temperature exceeds the setpoint plus hysteresis value.

  • Page 33: Backup Temperature Control System

    SECTION 300 – THEORY OF OPERATION BACKUP TEMPERATURE CONTROL SYSTEM (See Figure 9, Note 2) The electromechanical backup control system will take over control of the refrigeration systems if the main control system should fail to maintain the desired temperature. In this mode of operation, the sequencing relay will respond to a demand signal from the secondary control by energizing the side of the system that is not currently being controlled by the primary controller.
  • Page 34 SECTION 300 – THEORY OF OPERATION amber pilot lights on the lower status indicator panel indicate which system is in operation. The Backup Control thermostat has been provided to put both systems in operation if the cabinet temperature rises above its setpoint and to protect against failure of one refrigeration system or the primary controller.

  • Page 35: Section 400 - Maintenance And Service

    SECTION 400 – MAINTENANCE AND SERVICE SECTION 400 – MAINTENANCE AND SERVICE PREVENTIVE MAINTENANCE PROCEDURES Because heavy traffic areas are dustier than others, a cleaning schedule for AIR COOLED CONDENSERS air-cooled condensers and filters is difficult to predict. A suggested schedule, however, is 6 months, which can be adjusted as needed.

  • Page 36: Lco2 Vent

    SECTION 400 – MAINTENANCE AND SERVICE To check gaskets for proper sealing, use a 2” x 6” piece of paper (a dollar bill is handy) closed between the gasket and the lid at 12” intervals around the perimeter of the lid. At each position, pull on the free end of the paper. A slight resistance should be felt.
  • Page 37 SECTION 400 – MAINTENANCE AND SERVICE SYMPTOM POSSIBLE CAUSE TEST AND CORRECTION A. Cabinet 1. Control out of calibration. 1. Recalibrate if necessary. temperature colder than Control 2. Inoperative control 2. Replace control if necessary. Setpoint. 3. Cabinet relay points fused. 3.
  • Page 38 SECTION 400 – MAINTENANCE AND SERVICE F. High Stage 1. No power. 1. Check power source. If none, call Compressor qualified electrician. does not run 2. Low voltage. 2. Read supply voltage while unit is running. Reading must equal rated ±10%.If the facility voltage fluctuates often, add the optional Voltage Safeguard accessory.
  • Page 39 SECTION 400 – MAINTENANCE AND SERVICE G. Low stage 1. No power 1. Check power supply. Refer problem compressor to qualified electrician. does not run. 2. Inoperative controller, reverse 2. Check each component with high acting pressure control, high stage running and down to pressure limit, or circuit relay.
  • Page 40 SECTION 400 – MAINTENANCE AND SERVICE H. Unit runs but 1. Loss of refrigerant 1. Check for the leak, repair, evacuate and little or no recharge. refrigeration. On-cycles are getting longer. 2. Compressor will not pump. 2. Install low-side gauge. If running pressure is no lower than starting pressure, replace compressor, evacuate and recharge.
  • Page 41 SECTION 400 – MAINTENANCE AND SERVICE I. Cabinet 1. Control out of calibration. 1. Recalibrate if necessary. temperature colder than Control 2. Inoperative control 2. Replace control if necessary. Setpoint. 3. Cabinet relay points fused. 3. Replace relay if necessary. 4.
  • Page 42 SECTION 400 – MAINTENANCE AND SERVICE N. Unit runs 1. One or more sublids missing. Poor 1. Replace missing sub lids. Replace continuously. gasket seal. lid gasket. 2. Machine compartment fan not 2. Check for fan blade running obstruction. Replace fan motor if defective.

  • Page 43: Contactors And Relays

    SECTION 400 – MAINTENANCE AND SERVICE 10. Wrong refrigerant installed 10. Oil return line will be warm. Discharge pressure will be lower than normal, suction higher than normal. Suction gauge may fluctuate. Replace oil separator. 11. Leaking needle valve in oil separator. 11.

  • Page 44: Partial Or Complete Loss Of Refrigeration

    SECTION 400 – MAINTENANCE AND SERVICE greater than 10%, carefully check the refrigerant gas for “burned” odor. Any burned odor signals a winding breakdown and will require a compressor change. Also, a system cleanup is indicated. If not familiar with this procedure, consult the factory.

  • Page 45: Installing Gauges

    SECTION 400 – MAINTENANCE AND SERVICE INSTALLING GAUGES CAUTION Before installing or removing suction service gauges, always shut down the compressor and warm the valve so that moisture will not be drawn into a compressor operating in a vacuum. See below. Note When installing a gauge on the suction side of the system of either compressor of a unit that is down to operating temperature, always assume that both systems are operating on a vacuum on the low or suction side.
  • Page 46 SECTION 400 – MAINTENANCE AND SERVICE CAUTION Do not pressurize the system over 350 psig under any circumstances. CAUTION Never use Oxygen for pressurization or any other purpose in a refrigeration system. This is a highly dangerous practice and can result in a violent explosion.

  • Page 47: Repair Procedures

    SECTION 400 – MAINTENANCE AND SERVICE Note The filter-drier must ALWAYS be replaced whenever the refrigeration system has been opened to atmosphere. THE VACUM PUMP When evacuating a system, there is an initial flow of gases and moisture toward the vacuum pump but, as the vacuum becomes deeper (after a minute or two), the molecules of moisture-contaminating elements do not move toward the pump except by their random motion.
  • Page 48 SECTION 400 – MAINTENANCE AND SERVICE CAUTION Preventing the entrance of air to the refrigeration system and its resultant contamination is vital to the success of any repair procedure that involves opening the system. Be sure to observe all current regulations prohibiting venting of refrigerants 2.
  • Page 49 SECTION 400 – MAINTENANCE AND SERVICE the evaporator, condenser, and all of the tubing; the compressor, oil separator, and tubing that cannot be flushed MUST be replaced. INSTALL THE NEW COMPRESSOR CAUTION Nitrogen pressurized 13. Mount compressor on base and reinstall rubber feet and bolts . 14.

  • Page 50: Backflush Procedure

    SECTION 400 – MAINTENANCE AND SERVICE The gauge should not rise above 200 microns within 20 minutes. If it does, reopen the pump shut-off valve and allow the pump to evacuate the compressor for another 30 minutes. If the vacuum now holds longer, it indicates that there is still outgassing of nitrogen from the compressor oil.
  • Page 51 SECTION 400 – MAINTENANCE AND SERVICE Figure 5. Backflush Connections 1. Two removable sheet panels in the back of the freezer provide access to the first stage expansion valves . This area also provides access points for backflushing the evaporators. 2.
  • Page 52 SECTION 400 – MAINTENANCE AND SERVICE 5. Use the tubing cutter to remove the drier (item 24) from this compartment; this will loose the inlet end of the capillary tube, which will become the evaporator outlet when backflushing. 6. Cap the end of the tube that goes to the compressor, where the drier was connected.

  • Page 53: Evacuation Procedure

    SECTION 400 – MAINTENANCE AND SERVICE 9. Install a new drier in the access compartment. 10. Install new compressor as explained on page 43. Then evacuate and recharge the system using the following procedures. EVACUATION PROCEDURE Note Due to the low temperatures of operation, removal of all moisture is critical to prevent restrictions due to ice formation.
  • Page 54 SECTION 400 – MAINTENANCE AND SERVICE 5. Turn on the vacuum pump and ensure that the micron gauge drops to below 200 microns. If not, check for leaks and/or replace the pump and/or gauge. 6. Open the two manifold valves and let the pump run to a vacuum of 1500 microns;...

  • Page 55: Charging Procedure -- 1St (High) Stage

    SECTION 400 – MAINTENANCE AND SERVICE High Discharge Suction Access Access Valve Valve Vaccum Pump Shut-Off Valves Micron Gauge Figure 6. Evacuation and Recharge Process Connections CHARGING PROCEDURE -- (HIGH) STAGE Note See Appendix, Table 1 or the Unit Data Plate for the appropriate refrigerant charging data Required Equipment: 1.
  • Page 56 SECTION 400 – MAINTENANCE AND SERVICE Procedure 1. Replace the nitrogen tank with a charging tower. 2. Close the gauge manifold Low Pressure valve. 3. Weigh in the appropriate amount of refrigerant. 4. Disconnect the RALPC so that the second stage cannot run. 5.

  • Page 57: Thermocouple Labeling And Locations

    SECTION 400 – MAINTENANCE AND SERVICE 4. Replace the R290 cylinder with R508b. 5. Loosen the refrigerant supply hose at the gauge manifold; crack open the refrigerant tank valve and purge the hose for 2 seconds, then tighten the connection while purging. 6.

  • Page 58: Temperature Calibration

    SECTION 400 – MAINTENANCE AND SERVICE ‘B’ Heat Exchange Inlet ‘B’ Heat Exchange Outlet ( 2) Evap In ‘A’ Evap In will be located in the ‘A’ side compressor deck area ‘B’ Evap In will be located in the ‘B’ side compressor deck area (2) Evap Out ‘A’...
  • Page 59 SECTION 400 – MAINTENANCE AND SERVICE 4. Adjust Controller offset as per Appendix B. 5. Calibration is now complete. Return control setpoint to appropriate cycle temperature. Thermo Fisher Scientific Generic MBF700 Service Manual 55...

  • Page 60: Section 500 - Appendix

    SECTION 500 – APPENDIX SECTION 500 – APPENDIX Table 1: Refrigeration System Data............56 Table 2: Service Parts List..............57 Table 3: Junction Box Component Parts List/Layout......58 Figure 7: Refrigeration System Piping...........59 Table 4: Fahrenheit – Centigrade Conversion........60 Figure 8: Control PanelWiring Schematic..........61 Figure 9: Unit Electrical Wiring Diagram..........62 Figure 10: LCO2 Backup SystemWiring Diagram........63 56 Generic MBF700 Service Manual...
  • Page 61 REFRIGERATION SYSTEM DATA REFRIGERATION SYSTEM DATA Unit Model No.: MBF-700 Serial No.: HIGH STAGE LOW STAGE COMPRESSOR Volts:208-230VAC Bristol Bristol Model: 64A183DBL Model: L64A183DBL LRA: 124A LRA: 124A OIL CHARGE Compressor 50 oz of POE RL32 H 50 oz of Alkyl Benzene Zerol 1 50T Separator 15 oz of Alkyl Benzene Zerol 1 50T CUT OUT...

  • Page 62: Service Parts List

    SERVICE PARTS LIST SERVICE PARTS LIST PART NUMBER DESCRIPTION 80337H01 Auxiliary Status Indicator Assembly 77039H02 Blade, Fan, 12", 3 Blade, 24 ° Pitch 325059H01 Stage 1 Compressor, Bristol L64A183DBL 325059H01 Stage 2 Compressor, Bristol L64A183DBL 304131H05 Condenser, Water Cooled, 1 ton flat-plate 80504H01 Contactor, 230VAC/30A/3P (A1 ,A2,B 1 ,B2) 325058H01...
  • Page 63 SERVICE PARTS LIST JUNCTION BOX COMPONENT PARTS LIST Item # Description Backup Temperature Control Relay, 3PDT, 12Vac Fuse holder and fuses, 4A Terminal Strip Terminal Strip 12VDC Power Supply Sequencing Relay and Socket 8 (A1) Contactor, System “A”, 1 Stage 8 (A2) Contactor, System “A”, 2 Stage...
  • Page 64 SERVICE PARTS LIST Figure 7. Refrigeration System Piping Diagram Note 1. Only one refrigeration system is shown. Both systems are identical and refrigerate cabinet independently. 2. Set Item 9 at 7 PSIG cut-in, 21 PSIG cut-out Item # Description Compressor Condenser Receiver Oil Separator...
  • Page 65 SERVICE PARTS LIST The number in degrees, either Fahrenheit or Celsius, in the center column, refers to temperature. If converting Fahrenheit to Celsius, the equivalent temperature will be in the left column. Ifconverting Celsius to Fahrenheit, the equivalent temperature will be in the right column. BEG.
  • Page 66 SERVICE PARTS LIST Figure 8. Control Panel Wiring Schematic 62 Generic MBF700 Service Manual Thermo Fisher Scientific...
  • Page 67 SERVICE PARTS LIST Figure 9. Unit Electrical Schematic Thermo Fisher Scientific Generic MBF700 Service Manual 63...
  • Page 68 SERVICE PARTS LIST Figure 10. LCO2 Backup System Electrical Schematic 64 Generic MBF700 Service Manual Thermo Fisher Scientific...

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