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VOGT ICE 12A4171M12 Service Manual

Mhg-lr modular turbo refrigerating ice machine
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MHG-LR MODULAR
TURBO
REFRIGERATING
®
ICE MACHINE
Manual Part Number 12A4171M12
Service Manual
$50
00
8/28/00

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Summary of Contents for VOGT ICE 12A4171M12

  • Page 1 MHG-LR MODULAR TURBO REFRIGERATING ® ICE MACHINE Manual Part Number 12A4171M12 Service Manual 8/28/00...
  • Page 2 IMPORTANT: The Warranty Registration/Start-Up Report found in the front of this manual is to be completed and returned to the factory promptly after the official start-up. ® Please return to: VOGT ICE , LLC 1000 W. Ormsby Ave. Louisville, KY 40210...
  • Page 3 Vogt Ice L.L.C. Vogt Order Number: ____________________ 1000 W. Ormsby Louisville, KY 40210 THIS FORM MUST BE SENT TO (502) 635-3235 VOGT TO ACTIVATE WARRANTY FAX #502-635-3024 Warranty Registration / Start-Up Form (Medium & Large Machines) Model Number: __________________________ Serial Number: __________________________ This form must be filled out completely and signed by the customer in order to assure acceptance by Vogt.
  • Page 5 ® ® ® ® VOGT ICE , LLC, located in Louisville, Kentucky since 1880. Sales - (800) 853-8648 Parts and Service - (502) 635-3000 Since 1880, Manufacturers of Quality Tube-Ice Machines ® 3/30/10...
  • Page 6 ® Vogt ® Turbo Refrigerating Ice Machines Installation, Service Manual and Parts Catalog #12A4171M12 Modular Lowside Model...

  • Page 7: Table Of Contents

    MHG-LR Service Manual TABLE OF CONTENTS TABLE OF CONTENTS Vogt ® TUBE-ICE ® MACHINES MHG-LR Modular Model Page No. 1. INTRODUCTION A Brief History Of Our Company ..........................1-1 Preview ................................1-1 Important Safety Notice ..............................1-2 Special Precautions To Be Observed When Charging Refrigeration Systems ............1-2 Safety Symbols and What They Mean ...........................1-3 Assembly Drawing Model MHGFL, FIGURES 1-1, 1-2, 1-3 &...
  • Page 8 MHG-LR Service Manual TABLE OF CONTENTS Page No. INSTALLING YOUR TUBE-ICE MACHINE (con’t) Master Panel Field Ethernet Connections (Detail) Figure 3-11 ................3-13 Modular Panel Field Connections Figure 3-12......................3-14 Electrical Specifications, Table 3-2 ..........................3-15 Phase Check ................................3-15 Voltage Unbalance ................................3-15 Current Unbalance ..............................3-16 Screw Conveyor ................................3-16 Startup Checklist ................................3-18 4.
  • Page 9 MHG-LR Service Manual TABLE OF CONTENTS Page No 6. ELECTRICAL CONTROLS & THEIR FUNCTIONS (con’t) Configuring a New System or Module ..........................6-4 Dip Switch Settings for ECOM, Table 6-3...........................6-5 Modular Unit Operation ...............................6-5 Function of the Switch, Table 6-4 ............................6-6 Failure Indicators, Table 6-5..............................6-6 Master Panel Operation ................................6-7 Operator Interface Function Buttons, FIGURE 6-6 ......................6-7...
  • Page 10 MHG-LR Service Manual TABLE OF CONTENTS Page No SERVICE OPERATIONS Total Cycle Time ................................9-1 Standard Defrost Time ..............................9-1 Dry Time ................................9-1 Liquid Shut Off ................................9-1 Manual Defrost Time...............................9-1 Extended Defrost Time..............................9-1 Defrost Extend Count ..............................9-1 Conveyor Timer ................................9-1 Make-Up Water Float Valve ............................9-1 Refrigerant Float Switch (23) ............................9-2 Hand Expansion Valve (9)...............................9-2 Solenoid Valves (18, 25)..............................9-2...

  • Page 11: Introduction

    MGH-LR Service Manual INTRODUCTION 1. Introduction TURBO REFRIGERATION CO. A Brief History Of Our Company Henry Vogt Ice Machine Co. was founded as a small machine shop in Louisville, Kentucky in 1880. In 1938, Vogt built the first Tube-Ice ® machine and revolutionized the ice-making industry.

  • Page 12: Important Safety Notice

    MGH-LR Service Manual INTRODUCTION Important Safety Notice. This information is intended for use by individuals possessing adequate backgrounds of electrical, refrigeration and mechanical experience. Any attempt to repair major equipment may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

  • Page 13: Safety Symbols And What They Mean

    MGH-LR Service Manual INTRODUCTION Safety Symbols & What They Mean. Prior to installation or operation of the Tube-Ice ® machine, please read this manual. Are you familiar with the installation, start-up, and operation of a Tube-Ice ® machine? Before you operate, adjust or service this machine, you should read this manual, understand the operation of this machine, and be aware of possible dangers.
  • Page 14 MGH-LR Service Manual INTRODUCTION EVAPORATOR PIPING WATER PIPING ACCESS DOOR CONTROL PANEL WATER AND DRAIN CONNECTIONS FIGURE 1-1 Modular Flooded Front View 1/6/10...
  • Page 15 MGH-LR Service Manual INTRODUCTION REFRIGERATION VALVE ACCESS ICE DISCHARGE FIGURE 1-2 Modular Flooded Back View 1/6/10...
  • Page 16 MGH-LR Service Manual INTRODUCTION WATER PAN ACCESS DISCHARGE FIGURE 1-3 Modular Flooded Right View 1/6/10...

  • Page 17: 2. Receipt Of Your Vogt Ice Machine

    Any repair work or alteration to the machine without the permission of the Vogt Ice, LLC can void the machine’s warranty. You should also notify your Vogt distributor or the factory.

  • Page 18: Rated Capacity

    MHG-LR Service Manual RECEIPT OF YOUR TURBO REFRIGERATING MACHINE Rated Capacity The Turbo Refrigerating machine is rated to produce a given amount of ice when operating under the proper conditions as specified in this manual. You should be prepared to handle the ice produced as it is discharged from the machine and move it to your storage or bagging area promptly.
  • Page 19 MGH-LR Service Manual RECEIPT OF YOUR TURBO REFRIGERATING MACHINE 3/5/14...

  • Page 20: Machine Room

    MHG-LR Service Manual INSTALLING YOUR ICE MACHINE 3. Installing Your Turbo Refrigerating Ice Machine WARNING Only service personnel experienced and certified in refrigeration and qualified to work with high voltage electrical equipment should be allowed to install or work ® on this Turbo Refrigerating machine.

  • Page 21: Foundation Layout

    MHG-LR Service Manual ® INSTALLING YOUR TURBO REFRIGERATING MACHINE FIGURE 3-1 Lifting Procedure- Modular Unit Foundation Layout CAUTION The approximate machine operating weight is 3,400 pounds. CAUTION The machine foundation should be constructed from concrete or similar material in accordance with all local and federal OSHA codes and building regulations.

  • Page 22: Foundation Height- Modular Unit, Figure 3-2

    MHG-LR Service Manual INSTALLING YOUR ICE MACHINE "X" "X" "X" " "X" 13 1 4 “X” Auger Size FIGURE 3-2 Foundation Height- Modular Unit Figure 3-3 indicates minimum mounting requirements. Contact your local distributor for seismic anchoring requirements in your area. Additional bracing may need to be added to the top of the machine mounted to the lifting lug to meet local codes.

  • Page 23: Mounting Detail- Modular Unit, Figure 3-3

    MHG-LR Service Manual ® INSTALLING YOUR TURBO REFRIGERATING MACHINE DISCHARGE 1 1 2 FIGURE 3-3 Mounting Detail- Modular Unit Piping and Drain Connections Figure 3-5 (Water Connections and Refrigerant Connections) shows locations and sizes for all connections on lowside. CAUTION External shut-off valves must be provided in the water inlet lines.

  • Page 24: Water Tank Overflow

    MHG-LR Service Manual INSTALLING YOUR ICE MACHINE CAUTION The drain lines must NOT be connected into a pressure tight common header due to the possibility that warm condenser water may back up into the water tank. The condenser water outlet MUST be piped separately to the drain. CAUTION Make-Up Water In.

  • Page 25: Water Piping, Figure 3-4

    MHG-LR Service Manual ® INSTALLING YOUR TURBO REFRIGERATING MACHINE FIGURE 3-4 Water Piping Wet Suction and Liquid Stop Valve The MHG-LR is supplied with a stop valves on the suction and liquid connections. These stop valves are stainless steel soleniod valves. This type valve is a normally closed valve and required power to open.

  • Page 26: Spacing And Connection Diagram, (Flooded) Figure 3-5

    MHG-LR Service Manual INSTALLING YOUR ICE MACHINE FIGURE 3-5 – LR Spacing and Connection Diagram 5/15/09...
  • Page 27 MHG-LR Service Manual ® INSTALLING YOUR TURBO REFRIGERATING MACHINE SUCTION LIQUID LINE HOT GAS LINE MAKE-UP NUMBER OF LINE SIZE SIZE (OD SIZE (OD WATER SUPPLY MODULES (OD INCHES) INCHES) INCHES) (OD INCHES) 1 1/4 1 1/2 1 1/4 1 1/2 2 1/2 2 1/2 FIGURE 3-6...

  • Page 28: Piping Schematic (Flooded), Figure 3-7

    MHG-LR Service Manual INSTALLING YOUR ICE MACHINE FIGURE 3-7 Piping Schematic LR 5/15/09...
  • Page 29 MHG-LR Service Manual 3-10 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE 9/29/14...

  • Page 30: Wiring And Electrical Connection

    MHG-LR Service Manual 3-11 INSTALLING YOUR ICE MACHINE Wiring and Electrical Connection WARNING Only service personnel experienced in refrigeration and qualified to work with high voltage ® electrical equipment should be allowed to install or work on the Turbo Refrigerating machine.

  • Page 31: Master Panel Field Connections, Figure 3-9

    MHG-LR Service Manual 3-12 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE FIGURE 3-9 Master Panel Field Connections 9/29/14...
  • Page 32 MHG-LR Service Manual 3-13 INSTALLING YOUR ICE MACHINE FIGURE 3-10 Master Panel Field Connections (Detail) 5/15/09...

  • Page 33: Master Panel Field Ethernet Connections (Detail) Figure 3-11

    MHG-LR Service Manual 3-14 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE FIGURE 3-11 Master Panel Field Ethernet Connections (Detail) 9/29/14...

  • Page 34: Modular Panel Field Connections Figure 3-12

    MHG-LR Service Manual 3-15 INSTALLING YOUR ICE MACHINE FIGURE 3-12 Modular Panel Field Connections 5/15/09...

  • Page 35: Phase Check

    MHG-LR Service Manual 3-16 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE Standard F.L.A. Minimum Maximum Voltages Ampacity Fuse 208/230, 3ph, 60 Hz 10.4 460, 3ph, 60 Hz 220, 3ph, 50 Hz 11.6 13.3 400, 3ph, 50 Hz TABLE 3-2 3 Phase Electrical Specifications for Each Module Note: Refer to Chapter 6 for electrical component layout and description.

  • Page 36: Current Unbalance

    MHG-LR Service Manual 3-17 INSTALLING YOUR ICE MACHINE Current Unbalance Voltage unbalance will cause a current unbalance, but a current unbalance does not necessarily mean that a voltage unbalance exists. A loose terminal connection or a buildup of dirt or carbon on one set of contacts would cause a higher resistance on that leg than on the other two legs.
  • Page 37 MHG-LR Service Manual 3-18 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE Consult the supplier for recommendations for your complete conveying system. Screw Conveyor Diameter, inches 9" 12" 16" 16.4 38.4 93.4 Delivery, cubic feet / hour / revolution Percent Loading Fragmented Ice - TURBO TIG / TIGAR (Random non-sized fragments). Screw Conveyor Speed, RPM 9"...

  • Page 38: Startup Checklist

    MHG-LR Service Manual 3-19 INSTALLING YOUR ICE MACHINE Startup Checklist IMPORTANT Be sure to follow the wiring schematic when incorporating overloads. This is necessary to provide proper protection for the Turbo Refrigerating machine and its component parts. IMPORTANT Installation Review: A Checklist. Make a visual check to be sure these steps have been taken BEFORE continuing.
  • Page 39 MHG-LR Service Manual 3-20 ® INSTALLING YOUR TURBO REFRIGERATING MACHINE 9/29/14...

  • Page 40: How Your Tube-Ice Machine Works

    MHG-LR Service Manual HOW YOUR ICE MACHINE WORKS 4. How Your Ice Machine Works Principle Of Operation For a detailed description of the functions of each control panel component, see Section 6. The Mode Switch on each Module and the operator interface at the Master Panel controls operation of the machine.

  • Page 41: Dry Out Period

    MHG-LR Service Manual HOW YOUR ICE MACHINE WORKS from constantly recirculating water during the freeze period. As the ice thickness increases, the freezer suction pressure decreases. At a set time, the PLC initiates the harvest period. Dry Out Period. At the end of freeze, there is an optional brief period where the water pump is stopped, but the refrigeration circuit still remains in freeze.

  • Page 42: Piping Schematic Figure 4-1

    MHG-LR Service Manual HOW YOUR ICE MACHINE WORKS FIGURE 4-1 Piping Schematic 1/6/2010...

  • Page 43: Water Piping Schematic, Figure 4-2

    MHG-LR Service Manual HOW YOUR ICE MACHINE WORKS FIGURE 4-2 Water Piping Schematic LOW PRESSURE RECIEVER WET SUCTION LIQUID SUPPLY FIGURE 4-3 Typical High Side Layout 1/6/2010...

  • Page 44: Start-Up And Operation

    MGH-LR Service Manual START-UP AND OPERATION 5. Start-Up and Operation Refrigeration System Review The refrigeration system uses anhydrous ammonia (R-717) refrigerant. Following the piping schematic (Figure 4-1, 4-2 and 4-3), you will see that during the machine’s freeze cycle, the compressor discharge gas goes through the oil separator to remove any oil present in the discharge gas and return the oil to the compressor crankcase.

  • Page 45: Refrigerant Charge

    MHG Service Manual STAR-UP AND OPERATION Refrigerant Charge Prior to charging the machine with anhydrous ammonia (R-717) make sure the system is leak tight and free of non-condensables or other contaminants. The machine will require a full charge of pure anhydrous ammonia. Make sure it is from a reputable supplier who can and will furnish quality ammonia of Refrigeration or Federal Technical grade.

  • Page 46: Charging From Cylinders (Dedicated High Side Only)

    MGH-LR Service Manual START-UP AND OPERATION Charging From Cylinders (dedicated high side only). The machine may also be charged from refrigerant cylinders. To charge from cylinders, the compressor will have to operate to transfer the ammonia from the freezer to the receiver. Again, make sure all the necessary valves are opened for operation and the compressor crankcase heater has been energized for a minimum of four (4) hours.
  • Page 47 MHG Service Manual STAR-UP AND OPERATION CAUTION Immediately close system charging valve at commencement of defrost or thawing cycle if refrigerant cylinder is connected. Never leave a refrigerant cylinder connected to system except during charging operation. Failure to observe either of these precautions can result in transferring refrigerant from the system to the refrigerant cylinder, over-filling it, and possibly causing the cylinder to rupture because of pressure from expansion of the liquid refrigerant.
  • Page 48 MGH-LR Service Manual START-UP AND OPERATION Start-up CAUTION The crankcase heater should be energized for a MINIMUM of 4 hours and the crankcase must be free of liquid before attempting to operate the compressor. CAUTION Starting the machine in freeze mode: (NOTE: machine will always start in the harvest mode when started) 1.

  • Page 49: Shut-Down Procedure

    MHG Service Manual STAR-UP AND OPERATION 4. Adjust thaw gas regulator to build pressure to 80 - 85 psig (1 turn is approximately 13 psig). 5. Adjust (downstream) by-pass valve to allow a small amount of flow through the suction line. Open until ice release time is satisfactory.

  • Page 50: Operating Tips

    MGH-LR Service Manual START-UP AND OPERATION Operating Tips • If the operation of your machine is not controlled by a timer, bin level control or some other mechanism to automatically start and stop ice production, you should use ONLY the Master switch on the interface to start and stop machine.

  • Page 51: Diagram Depicting A Typical Master / Modular Set Up, Figure 6-1

    MHG-RL Service Manual ELECTRICAL CONTROLS 6. Electrical Controls-Description The control system used in the Modular Icemaker(s) is a multi-part system, a Master Panel and its Ice making Modules. Each Master Panel can control up to 20 modules. The Master Panel communicates with each Modular Icemaker via an Ethernet connection.
  • Page 52 MHG-RL Service Manual ELECTRICAL CONTROLS FIGURE 6-2 Exterior view of Master Panel showing the operator interface and an indicator light. FIGURE 6-3 Internal view of Master Panel Programmable Logic Controller-controls the various relays in the panel and contains the program. FUSE Fuse-protects the control circuit inside the control panel Power Supply for ETH1-provides 24VDC for the ETH1...
  • Page 53 MHG-RL Service Manual ELECTRICAL CONTROLS Figure 6-4 External view of Modular Panel showing the mode pushbutton and the mode indicator light. FIGURE 6-5 Internal view of Modular Panel Programmable Logic Controller-controls the various valves and relays wired to the panel and contains the program. FUSE Fuse-protects the control circuit inside the control panel Liquid Valve Relay-provides open and close control for motorized liquid valve.

  • Page 54: Configuring A New System Or Module

    MHG-RL Service Manual ELECTRICAL CONTROLS Configuring a New System or Module Both the Master Panel and any Modular Panel in your system will have a PLC in it. In order for these PLCs to communicate, they have an Ethernet card installed in an expansion slot.

  • Page 55: Modular Unit Operation

    MHG-RL Service Manual ELECTRICAL CONTROLS DIP switch settings for ECOM Switch--> Master Panel Module (Slave) #1 Module (Slave) #2 Module (Slave) #3 Module (Slave) #4 Module (Slave) #5 Module (Slave) #6 Module (Slave) #7 Module (Slave) #8 Module (Slave) #9 Module (Slave) #10 Module (Slave) #11 Module (Slave) #12...
  • Page 56 MHG-RL Service Manual ELECTRICAL CONTROLS Mode Switch Mode Initiated Mode Description Presses Press and hold for 3 Off/Reset If the unit is already in an active ice making cycle, it will defrost seconds after the full cycle and then turn off. If the unit is in a standby mode, it simply turns off.

  • Page 57: Master Panel Operation

    Upon application of control power to the Master Panel, you will see a screen appear that shows the Vogt Ice logo. That screen also shows the version of program for the PLC and the Operator Interface. After a few seconds, the screen will change to the Main Menu.
  • Page 58 MHG-RL Service Manual ELECTRICAL CONTROLS Once the main menu appears, the system is ready to operate. The Main Menu has four choices available: Settings, Control, Failures, and Status. • Settings: The Settings Menu will present you with two more choices, Ice Maker settings and Screw Conveyor settings.

  • Page 59: Operator Interface Item Descriptions, Table 6-7

    MHG-RL Service Manual ELECTRICAL CONTROLS Menu Item Description Cycle Time Length of the entire cycle for any given Module. To make thicker ice, increase this value. Entered in minutes and seconds. (mm:ss) Normal Defrost Time Length of a normal defrost cycle entered in seconds. Dry Time If the water pump is set to stop during defrost, this determines how long before defrost begins that the pump will stop.
  • Page 60 6-10 MHG-RL Service Manual ELECTRICAL CONTROLS Review the items on the Settings Menu screens (items 1 through 15 shown above) and make any adjustments you feel necessary. The PLC has been programmed with factory defaults that should work as a starting point in most circumstances. To access the settings, go to the Main Menu, select Settings, and then select Icemaker.

  • Page 61: Maintenance

    7. Maintenance Preventive Maintenance A careful inspection of the Vogt Ice machines refrigeration system for leaks and correct operational functions at time of installation will start its long satisfactory life of service. In order to insure this degree of dependability, a systematic maintenance program is recommended.
  • Page 62 MHG-LR Service Manual MAINTENANCE PREVENTATIVE MAINTENANCE FORM This form can be removed and duplicated for record keeping. Date: ______________ Model #: ________________________ Serial #: ___________________ The following service performed and checked: Hour meter reading _______________ , Ambient temperature (inside)_______ °F Make-Up water float valve adjusted properly Water distribution clean and in place All drains freely draining...

  • Page 63: Ice-Making Section

    MHG-LR Service Manual MAINTENANCE Ice Making Section The ice-making section of the Vogt-Ice machine should be cleaned at least twice a year (more often if water conditions cause mineral build-up). Use an approved food-grade ice machine cleaner. The water pump is used to circulate the cleaner through the system by manually operating it with the operator interface located at the Master Panel.

  • Page 64: Water Distribution System

    MHG-LR Service Manual MAINTENANCE Water Distribution System Water Distribution. The water distribution pan is located under the top cover at the top of the freezer. This distributors may require occasional or periodic cleaning to remove solids and foreign particles accumulated from the make-up water. The frequency of this cleaning operation will depend on the characteristics of the water supply.

  • Page 65: Optional Maintenance Operations

    MHG-LR Service Manual MAINTENANCE CAUTION Only qualified refrigeration service personnel familiar and experienced in the handling and use of anhydrous ammonia (R717) should be authorized to perform the “Draining Oil Trap” procedure. CAUTION Optional Maintenance Operations The following sections outline some general guidelines for service of auxiliary equipment. Always follow the instructions provided by equipment manufacturers when performing service operations or scheduled maintenance.

  • Page 66: Cooling Tower Maintenance Schedule, Table 7-3

    MHG-LR Service Manual MAINTENANCE CAUTION Follow all lock-out and tag-out procedures before servicing any electrical equipment. CAUTION Maintenance Operation Start-Up Monthly Six Months Shutdown Clean debris from unit Clean strainer and flush sump Check fan and pump rotation Clean spray nozzles Check belt tension Check for noise/vibration Check/adjust make-up water valve...

  • Page 67: Compressor (Optional)

    MHG-LR Service Manual MAINTENANCE Compressor (optional). This section is only a guide; consult the compressor manual for manufacturers recommended maintenance. In starting and charging the unit, the oil sight glass should be continually checked to make sure an adequate oil level is maintained. The oil level should be 1/4-3/4 of the sight glass. If the oil level drops below 1/4 of the glass, add refrigeration oil as per the compressor manufacturer recommendations.

  • Page 68: Troubleshooting

    MHG-LR Service Manual TROUBLESHOOTING 8.Troubleshooting WARNING Only service personnel experienced and certified in refrigeration and qualified to work with high voltage electrical equipment should be allowed to install or work ® on this Turbo Refrigerating machine. WARNING CAUTION Follow all lock-out and tag-out procedures before servicing any electrical equipment. CAUTION Your machine’s electrical system has several built-in safety and overload protection features Note:...
  • Page 69 MHG-LR Service Manual TROUBLESHOOTING Symptom: Machine Stopped Possible Cause Possible Remedy Power failure or interruption Check fused disconnect or circuit breaker supplying power to the machine. If power has been off, make sure the crankcase heater is energized and there is no liquid refrigerant in the compressor crankcase prior to restarting the compressor.
  • Page 70 MHG-LR Service Manual TROUBLESHOOTING Symptom: Freeze-up due to extended freeze period Possible Cause Possible Remedy Refrigeration timer set to long Adjust timer setpoint in the settings screen. Water tank drain valve, make-up water float valve or flushing Close, repair, or replace valve as needed. The float valve valve opened too far should be adjusted low enough that water should not run out the tank overflow during the freeze cycle.
  • Page 71 MHG-LR Service Manual TROUBLESHOOTING Symptom: Low ice capacity. Suspicions of low ice capacity should be confirmed by accurate calculations of actual ice product. Significant losses can occur due to melting and off fall through augers and other ice handling equipment. Time the total cycle (freeze time + thaw time).
  • Page 72 MHG-LR Service Manual TROUBLESHOOTING Symptom: Poor ice quality Possible Cause Possible Remedy Excessive concentration of solids in the water tank usually Perform a cleaning procedure as well as removing the freezer indicated by a build-up of mineral deposit on the sides and cover and cleaning the water distributors.
  • Page 73 MHG-LR Service Manual TROUBLESHOOTING Symptom: High suction pressure (check gage accuracy) Possible Cause Possible Remedy Compressor running unloaded or not pumping efficiently Check compressor motor amp. If the compressor is running unloaded, the amperage will only be approximately 60% of normal amp draw.
  • Page 74 MHG-LR Service Manual TROUBLESHOOTING Symptom: High compressor discharge temperature Possible Cause Possible Remedy High head pressure Check gage accuracy and “High discharge pressure”. Defective suction or discharge valves Feel the compressor heads for hot spots or one head running hot. Replace worn or leaking valves. Restriction in the discharge gas line Check all hand and check valves to make sure they are fully opened and not stuck.
  • Page 75 MHG-LR Service Manual TROUBLESHOOTING 1/6/10...

  • Page 76: Service Operations

    MHG-LR Service Manual SERVICE OPERATIONS 9. Service Operations Total Cycle Time. The freezing time period for the production of ice on the plates is controlled by the Total Cycle Time. This setting is located in the Settings Menu via the Icemaker option on the operator interface.

  • Page 77: Refrigerant Float Switch (23)

    MHG-LR Service Manual SERVICE OPERATIONS ascertain if the proper water level is being maintained. After the machine is stopped and the water in the tank seeks its normal level, there should be no water flow through the float valve or overflow. It is advisable to install a large area strainer in the water supply line to protect the float valve from dirt or solids in the water that would necessitate frequent cleaning.

  • Page 78: Pumpdown Procedure

    MHG-LR Service Manual SERVICE OPERATIONS To prepare the machine for disconnecting and moving. Before cleaning Pumpdown Procedure To perform a pumpdown, follow this procedure: 1. With the machine running, close the liquid feed stop valve nearest the receiver 2. Put the water pumps in manual operation. 3.

  • Page 79: Refrigerant Leaks

    MHG-LR Service Manual SERVICE OPERATIONS WARNING It is not recommended that refrigerant be transferred from a refrigeration system into a cylinder. If such a transfer is made, the refrigerant cylinder must be an approved CLEAN cylinder-- free of any contaminants or foreign materials--and must be weighed continuously to assure contents do not exceed net weight specified by cylinder manufacturer or any applicable code requirements.

  • Page 80: Purging Procedure

    MHG-LR Service Manual SERVICE OPERATIONS Air collects mostly in high pressure condensers, receivers, and other high-pressure components. It collects mostly in the coolest, lowest-velocity area of these components. Evaporative condensers usually have purge points at the top of the outlet header of each circuit. Receivers usually have a purge point at the top, away from the inlet, where it is coolest and the gas velocity is the lowest.

  • Page 81: Removing Excess Water From Ammonia

    MHG-LR Service Manual SERVICE OPERATIONS DANGER Do not leave the oil trap drain valve opened or unattended--severe injury may result DANGER 5. When a small amount of liquid ammonia begins to spew out, immediately close the valve. 6. Remove the hose and install a plug in the valve. DO NOT attempt to reuse any oil taken from the system unless it is properly reclaimed and meets the proper specifications.
  • Page 82 MHG-LR Service Manual SERVICE OPERATIONS 11. When the freezer (suction) pressure is up to at least 60 PSI, manually close the liquid line solenoid valve and restore power to the machine. 12. Open the compressor discharge valve, oil return valve, and all other valves that should be opened for normal operation.
  • Page 83 Appendix A...
  • Page 84 Material Safety Data Sheet # 4001 OCHE NDUSTRIES INC 2/15/96 SECTION 1: CHEMICAL PRODUCT & COMPANY IDENTIFICATION CHEMICAL NAME: Anhydrous Ammonia TRADE NAMES/SYNONYMS Ammonia PRODUCT CODE: 5B81-83 MANUFACTURER AND/OR DISTRIBUTOR: EMERGENCY TELEPHONE NUMBERS: LaRoche Industries Inc. Transportation (CHEMTREC): (800) 424-9300 1100 Johnson Ferry Rd., NE Environmental/Health/Safety: (800) 528-4963...
  • Page 85 SECTION 8: EXPOSURE CONTROLS/PERSONAL PROTECTION RESPIRATORY PROTECTION: Respiratory protection approved by NIOSH/MSHA for ammonia must be used when exposure limits are exceeded. Whether a chemical cartridge respirator or a self-contained breathing apparatus is sufficient for effective respiratory protection depends on the type and magnitude of exposure. EYE PROTECTION: Chemical splash goggles, approved for use with ammonia, must be worn to prevent eye contact with liquid or vapor.
  • Page 87 Copyright 1989 by LaRoche Industries Inc. All rights reserved. Quotation or production in whole or part without written permission is expressly prohibited.

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