Miura LX Series Operation Manual
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Miura LX Series Operation Manual

Steam boiler
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MIURA STEAM BOILER
OPERATION MANUAL
LX-50
LX-100
LX-150
LX-200
LXH-200
LXH-300
INFORMATION IN THIS MANUAL MAY BE CHANGED
WITHOUT ANY NOTICE.
Please ensure that operation manual is read and observed in
full by all persons working with the steam boiler.
Please also ensure that it is stored in a location where it may
be easily accessed by said persons.
Operation Manual Number : T519-998-9007
LXL-50
LXL-100
LXL-150
LXL-200
LX-300
Date of issue : Aug. 16, 2017

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  • Page 1 MIURA STEAM BOILER OPERATION MANUAL LX-50 LXL-50 LX-100 LXL-100 LX-150 LXL-150 LX-200 LXL-200 LXH-200 LX-300 LXH-300 INFORMATION IN THIS MANUAL MAY BE CHANGED WITHOUT ANY NOTICE. Please ensure that operation manual is read and observed in full by all persons working with the steam boiler.

  • Page 2: Main Sections

    Main Sections INTRODUCTION ESSENTIAL BOILER WATER TREATMENT COMPONENT NAMES & FUNCTIONS BASIC PRECAUTIONS PRE-OPERATION INSPECTION USING BOILER CONTROLS PREPARING FOR STARTUP OPERATING THE STEAM BOILER INSPECTION & MAINTENANCE 10. BREAKDOWN & COUNTERMEASURES 11. SPECIFICATIONS 12. APPENDIX...

  • Page 3: Table Of Contents

    Table of Contents Main Sections ............................1 1 INTRODUCTION ..........................4 Safety Indicators ..........................5 Glossary .............................. 6 Warranty ............................. 7 Introduction ............................7 Features .............................. 8 Description ............................10 Acts & Regulations ........................... 12 National Regulatory Organizations ....................13 2 ESSENTIAL BOILER WATER TREATMENT ................
  • Page 4 9.5.2 Checking the Water Softness ..................60 9.5.3 Checking the Gas Pressure ..................... 61 9.5.4 Checking the Steam Pressure ..................61 9.5.5 Blowdown & Testing of the Low Water Level Interlock ..........62 9.5.6 Cleaning the Air Filter ....................64 9.5.7 Cleaning the Feed-water Strainer ..................

  • Page 5: Introduction

    INTRODUCTION...

  • Page 6: Safety Indicators

    Safety Indicators The following headings are used within this manual in order to ensure safe and efficient operation of your steam boiler. Please ensure that you fully understand the meaning of each and use the boiler accordingly. Failure to use the steam boiler correctly could WARNING possibly lead to serious injury or death of the user.

  • Page 7: Glossary

    Glossary Please use the following table to confirm the meanings of special terms used within the operation manual. Term Meaning Low water level The action of preventing ignition when the normal water level has not been interlock achieved. Purging with air from the boiler’s combustion chamber before the start of Pre-purge combustion.

  • Page 8: Warranty

    The MIURA Advantage — proven in the field over fifty years of excellent service — is the ability of our boilers to reach full output steam from a cold start in less than five minutes using the least...

  • Page 9: Features

    55% market share in the Pacific Rim region. MIURA Boiler Co., Ltd. has developed the Low NOx Boiler using state-of-the-art technologies, and both the flat burner and rectangular boiler vessel have been uniquely designed for the LX.
  • Page 10 MIURA BL Microprocessor Boiler Control featuring a user-friendly digital display • Communication interface functionality • • Display of hours of operation and logging of the seven most recent faults Support for remote modem-based monitoring of boiler performance and troubleshooting from a MIURA • technical center...

  • Page 11: Description

    This safety configuration may seem confusing to the inspector who encounters the MIURA Steam Boiler in the field for the first time, particularly because a water column typically suggests a fixed water level. This is not true for our steam boilers, however, because of the low water content and the fierce boiling action of the steam gradient.
  • Page 12 A full inspection is typically completed within 30 minutes. All MIURA steam boilers are annotated as a forced flow steam generator (with no fixed steam or water level) on the pressure vessel’s P-3 form and registered with the National Board. The complete packaged steam boiler is listed as a standard with UL and c-UL, and it can be tuned to meet FM and/or ASME-CSD1 requirements at the customer’s request.

  • Page 13: Acts & Regulations

    For more information on how the various rules affect boiler selection and operation, you may want to contact your local MIURA authorized representative or the engineering firm designing your boiler installation. Here are some essential...

  • Page 14: National Regulatory Organizations

    National Regulatory Organizations In order to obtain assistance in the identification of, and compliance with, codes and regulations, we recommend contacting your actual insurance provider as well as the utility companies. A partial list of agencies having jurisdiction over boiler installation and operation is given below. This list is comprehensive, but by no means all-inclusive.

  • Page 15: Essential Boiler Water Treatment

    ESSENTIAL BOILER WATER TREATMENT 2.1 Flow Chart ................15 2.2 Water Treatment Guidelines ........... 17...

  • Page 16: Flow Chart

    2.1 Flow Chart Hard-Leak Alarm (Colormetry) Chemical Feeder Monitors the treated soft water Feeds chemicals into the boiler in after the water softener. order to prevent it from corroding. Water Softener The water supply is usually hard water. The water softer converts this to soft water. NOTE Tap water and well water contain a wide range of dissolved impurities in varying amounts.
  • Page 17 Main feed water valve Once-through steam boiler Boiler Makeup Tank Water delivered to the inside of Two different varieties of the tubes is heated by the Main boiler makeup tank are combustion of fuel using a burner. power available – namely, the water As a result of this heating, the Fused tank and the deaerator tank.

  • Page 18: Water Treatment Guidelines

    System integrated water softeners One of the most common causes of boiler damage is scale. MIURA offers a solution through our System Integrated Water Softener - MW series; featuring split flow regeneration and MIURA Online Maintenance.
  • Page 19 Daily operation MIURA has no warranties to cover damage due to improper water treatment and failure to maintain the guidelines listed. MIURA MAKE-UP WATER MAINTENANCE CHECK To keep your MIURA boilers running in optimum condition, be sure to check the following daily: a) CHEMICAL FEED PUMP i.
  • Page 20 END USER RESPONSABILITIES: 1. Water test must be performed every day. Miura recommends to record the results from the daily test. Refer to your contract terms and conditions or contact your Miura representative for guidelines about daily water test and log.

  • Page 21: Component Names & Functions

    COMPONENT NAMES & FUNCTIONS...
  • Page 22 LX-300SG-07 Safety valve Allows pressure to escape from the pressure vessel when it reaches an abnormal level (i.e., exceeding the maximum pressure). Pressure gauge Displays the level of steam pressure within the pressure vessel. Control panel Provides switches and display devices required for operating the boiler.
  • Page 23 Main steam outlet Used to provide steam to the load application. (Control/connection of steam to the load application) Control box Contains electrical parts used to control the boiler.
  • Page 24 Blower Delivers the air required for combustion into the combustion chamber. Economizer Collects heat in the exhaust gas and uses it for preheating feed-water. Warning label Presents cautions and warnings that must always be read before using the boiler. For more details, please refer to SECTION 4.
  • Page 25 LX BOILER SECTION VIEW...

  • Page 26: Basic Precautions

    BASIC PRECAUTIONS 4.1 Items to Check before Use ............26 4.2 Clothing Requirements for Safe Operation ......27 4.3 Warning Labels ................ 27 4.4 Dealing with Abnormal Conditions .......... 28 4.5 Precautions for Boiler Usage ........... 29 4.6 Fire Extinguishers & First Aid Boxes ........29 4.7 Prohibition of Unapproved Modification ........

  • Page 27: Items To Check Before Use

    SECTION 5. PRE- for trial operation to be OPERATION conducted by MIURA INSPECTION. maintenance personnel or distributor. Ensure that you use the boiler correctly. Do not attempt to operate...

  • Page 28: Clothing Requirements For Safe Operation

    Any peeling or torn applied to indicate warning labels must be locations where hazards replaced. exist. Please contact a MIURA For more details sales office or your local regarding these locations, dealer regarding this and refer to SECTION 3: other warning-label COMPONENT NAMES &...

  • Page 29: Dealing With Abnormal Conditions

    Failure to observe this precaution may result in explosion. Responding to abnormal conditions Always follow the instructions given by MIURA sales offices or local dealers when abnormal conditions arise. In addition, discontinue to use the boiler until the abnormality has been removed.

  • Page 30: Precautions For Boiler Usage

    MIURA recommends Failure to follow the CO detectors to be precaution can result in Installed. electric shock, burns, and other injury.

  • Page 31: Prohibition Of Unapproved Modification

    Always confer with MIURA maintenance personnel before carrying out any such modification work. Note that MIURA will not be responsible for the consequences of unapproved modification. When Reselling or Relocating Contact us when intending to move or sell your boiler...

  • Page 32: Pre-Operation Inspection

    PRE-OPERATION INSPECTION Refer to the “INSTALLATION MANUAL” for more details.
  • Page 33 WARNING Before operating the boiler, please check each of the installation points below. Do not use the boiler if it has not been correctly installed. Failure to follow this precaution may have serious consequences. Boiler Room Installation of ventilation equipment (or air vents) Confirm the boiler room is installed with ventilation fan or air supply and exhaust vents.
  • Page 34 Electrical Work Failure to observe warnings relating to electrical Fuse or Circuit breaker Fuse or circuit breaker work can lead to electric shock. Dedicated power supply for the boiler Confirm that the boiler has a dedicated supply capacity of main power and a dedicated breaker installed on the power-supply line.
  • Page 35 WARNING Before operating the boiler, please check each of the installation points. Do not use the boiler if it has not been correctly installed. Failure to follow this precaution may have serious consequences. Safety-Valve Discharge Piping End of discharge piping to be pointing in a safe direction Safety Confirm the end of the safety valve’s valve...

  • Page 36: Using Boiler Controls

    USING BOILER CONTROLS 6.1 Names & Functions of Control Panel Items ......36 6.2 Working with the Display ............37 6.2.1 Display Content ............. 37 6.2.2 Using the Display (“DATA” & “SELECT”) ...... 38 6.2.3 Display Content for Heat Management Mode ....39 6.2.4 Display Content for User Setting Mode ......

  • Page 37: Names & Functions Of Control Panel Items

    Names & Functions of Control Panel Items Names & Functions of Switches Status lamps Display “SELECT” switch To switch between parameters for each mode of operation, to modify values, and to select individual characters. “DATA” button “OPERATION” switch • To select parameters for individual •...

  • Page 38: Working With The Display

    Working with the Display 6.2.1 Display Content Operation Status & Parameters (Monitoring NOTE mode) If switches are not operated for a period of time, the Typical display: system will automatically switch over to Monitoring Upper row of display: mode and the display will show steam-pressure data. Boiler operation mode H I G H F I R E S T E A M...

  • Page 39: Using The Display ("Data" & "Select")

    Purpose of Each Mode In this mode, data required for boiler control such as the steam pressure and exhaust Monitoring Mode gas temperature is presented. Refer to page 36 for more details regarding the actual display content. In this mode, data required for heat management such as the boiler efficiency and fuel Heat Management Mode consumption is presented.

  • Page 40: Display Content For Heat Management Mode

    *: Data is updated every hour. NOTE The Segment Start Time can be set in intervals of one hour. (The default setting is 00:00.) If you need to change this setting, please arrange for MIURA maintenance personnel to do so.

  • Page 41: Display Content For User Setting Mode

    6.2.4 Display Content for User Setting Mode In User Setting mode, you can set steam pressure levels and the current time (YY/MM/DD HH:MM). NOTE The current time is used by a range of different processes working with control data, and for this reason, you must set it correctly.
  • Page 42 Setting Steam Pressures NOTE If no switches are operated for a certain period of time, the system will automatically switch over to Monitoring mode and the display will show steam-pressure data. (This action does not cause any settings to change.) DATA Press the “DATA”...
  • Page 43 Setting the System Date & Time NOTE If no switches are operated for a certain period of time, the system will automatically switch over to Monitoring mode and the display will show steam-pressure data. (This action does not cause any settings to change.) DATA Press the “DATA”...

  • Page 44: Display Content For Fault History Mode

    6.2.5 Display Content for Fault History Mode Using Fault History mode, you can review the content of recent alarms and cautions, together with the corresponding times of occurrence. Specifically, you can use the “DATA” button to display the seven most recent alarms and cautions. For more details regarding this mode’s display items, refer to Section 10.3: Action to be Taken before Ordering Repairs.

  • Page 45: Confirming Gauge Readings

    Confirming Gauge Readings Steam Pressure Display The steam pressure gauge measures the pressure of steam inside the boiler. The measured value is presented in both digital and analog format. The analog display is in units of ** PSI. The digital display has a resolution of 1 PSI. <Analog display>...

  • Page 46: Operating The Main Steam Valve

    Operating the Main Steam Valve WARNING The main steam valve is located high on the boiler with limited space available for footing. It is important to wear suitable protective clothing (i.e., long sleeves and trousers, safety footwear, a helmet, gloves) whenever opening or closing this valve.

  • Page 47: Preparing For Startup

    PREPARING FOR STARTUP...
  • Page 48 The following checks must be carried out before starting the boiler. Turn on the breaker for the boiler’s main power. WARNING Do not carry out this procedure with wet hands. Failure to observe this precaution may lead to electric shock and have other undesirable consequences. WARNING All cover plates, enclosures and guards must be in place at all times, except during maintenance and...
  • Page 49 As described in Section 9.5.2: Checking the Water Softness, confirm that the feed water has been correctly softened. Confirm that the main steam valve is closed. If this is not the case, apply the method described in Section 6.4: Operating the Main Steam Valve Close and close the valve.

  • Page 50: Operating The Steam Boiler

    OPERATING THE STEAM BOILER 8.1 Boiler Startup ................50 8.2 Inspection during Operation ............ 51 8.3 Boiler Shutdown ..............52...

  • Page 51: Boiler Startup

    WARNING This is a shop-tested, assembled, and fully-packaged boiler. Each unit and assembly has been carefully adjusted at the factory. It is very important not to make any adjustments without first consulting a MIURA sales office or the local dealer.

  • Page 52: Inspection During Operation

    Always follow the instructions given by MIURA sales offices or local dealers whenever strange or abnormal conditions arise. In addition, discontinue use of the boiler until the abnormality has been removed. Failure to observe this precaution can result in fire, explosion, and other dangerous situations.

  • Page 53: Boiler Shutdown

    8.3 Boiler Shutdown Turn off the “OPERATION” switch. Confirm that the Status lamp turns off. Apply the method described in Section 6.4: Operating the Main Steam Valve and close the Close valve. Main steam valve Close the main feed water valve and the main gas valve. Close Main feed water valve NOTE...

  • Page 54: Inspection & Maintenance

    INSPECTION & MAINTENANCE 9.1 Preparing for Possible Freezing ..........54 9.1.1 Bleeding Water to Protect against Freezing ....54 9.2 Maintenance during Extended Inactivity ......... 55 9.3 Regular Maintenance Tasks and Timing ......... 56 9.4 Spare Parts ................58 9.5 Overview of Inspection ............59 9.5.1 Checking the Chemical Feeder ........

  • Page 55: Preparing For Possible Freezing

    If you require more information regarding such countermeasures, please do not hesitate to contact MIURA sales office. 9.1.1 Bleeding Water to Protect against Freezing Bleeding Water from the Pressure Vessel Shut down the boiler as described in Section 8.3: Boiler...

  • Page 56: Maintenance During Extended Inactivity

    For shutdown longer than 10 days, the boiler must be filled up with water with higher deoxidizing, to maintain a chemical residual of 200-400 mg/L in the boiler water or drained and treated with inert gas or deoxidizing agent Please contact Miura service office for further details.

  • Page 57: Regular Maintenance Tasks And Timing

    Conduct an internal inspection of the pressure vessel, and clean the water level probes. Install the inspection port plugs and probes and operate the boiler normally. If the boiler is to be inactive for a protracted period of time, please contact a MIURA sales office or your local dealer.
  • Page 58 Water Quality Check Page 19 Safety Sensors Check Page 70 Safety Valve Inspection Page 69 Cleaning UV sensor Protective Glass Page 70 Electric motors are pre-lubricated at the factory and do not require additional lubrication at startup. Motors with grease fittings should be lubricated using lithium-base grease only and at the frequency given in the table below: TYPE OF SERVICE FREQUENCY OF GREASING...

  • Page 59: Spare Parts

    Spare Parts Please contact Miura service office in your area or your Miura representative for replacement parts, or the list of replacement parts.

  • Page 60: Overview Of Inspection

    Overview of Inspection 9.5.1 Checking the Chemical Feeder NOTE A chemical feeder (not included) is a critical component of the overall water management system for a boiler. Be sure to read and understand your chemical feeder’s operation manual thoroughly, and to operate the feeder in a strict accordance with the instructions given.

  • Page 61: Checking The Water Softness

    9.5.2 Checking the Water Softness NOTE A water softener (not included) is a critical component of overall water management for a boiler. Be sure to read and understand your water softener’s operation manual thoroughly, and to operate the softener in strict accordance with the instructions given. You should also ensure that the water softener’s operation manual is stored together with this operation manual in a location that can be readily accessed by persons working on the boiler system.

  • Page 62: Checking The Gas Pressure

    If the reading on the gas pressure gauge is not within the required range, immediately shutdown the boiler as described in Section 8.3: Boiler Shutdown and contact a MIURA sales office or your local dealer for further instruction. Gas pressure gauge 9.5.4...

  • Page 63: Blowdown & Testing Of The Low Water Level Interlock

    Although the Status lamp will turn off and the display’s blowdown request will be cleared when the “DATA” button is pressed, the “B” indicator will not. Blowdown must always be carried out in strict accordance with instructions given by MIURA maintenance personnel.
  • Page 64 WARNING Confirm that the blowdown piping has been firmly secured in place in order to prevent it moving in reaction D I S A B L E to the blowdown discharge. S T E A M 0 P S I Confirm that the outlet of the blowdown piping is fully open and in a safe location, such as inside a pit.

  • Page 65: Cleaning The Air Filter

    Failure to observe this precaution may result in a fall from Air Filter Box the boiler or damage to the boiler itself. If the filter is damaged or extremely dirty, it must be replaced. In such a case, please contact MIURA maintenance personnel.
  • Page 66 Filter Pull the filter forward together with the filter retainer. (4piece If the filter is damaged or extremely dirty, it must be replaced. In such a case, please contact MIURA maintenance personnel. Return the filter to its original position. WARNING Do not operate the boiler without the air filter installed.

  • Page 67: Cleaning The Feed-Water Strainer

    9.5.7 Cleaning the Feed-water Strainer WARNING Water in the feed-water tank for the boiler connecting to a deaerator or hot water tank is extremely hot. For this reason, you should wait until the boiler’s water supply lines have sufficiently cooled down (at least two hours after boiler shutdown) before performing this work.
  • Page 68 If rust cannot easily be removed from gaps or significant deformation has occurred, the filter must be replaced. In such a case, please contact a MIURA sales office or your local dealer. Filter Brush Return the filter to its original position inside the feed water strainer.

  • Page 69: Cleaning The Feed-Water Tank

    9.5.8 Cleaning the Feed-water Tank WARNING Water in supply lines for boilers connecting to a deaerator or hot water tank is extremely hot. For this reason, you should wait until the tank water has sufficiently cooled down (at least two hours after boiler shutdown) before performing this work.

  • Page 70: Inspecting The Safety Valve

    The safety valve’s release pressure has been adjusted to match the indicated value. Despite the fact that a small amount of deviation may occur, you must not tamper with the pressure setting. If you suspect leakage or some other abnormality, please contact a MIURA sales office or your local dealer.

  • Page 71: Safety Sensors Check

    Miura boilers have the function though, the hardness checking by Colormetry and manual water sampling still have to be done by all Miura customers. (Since there are several scaling patterns depending on the firing ratio, or water quality, scale monitor doesn’t always detect the thickest scale. It doesn’t guarantee the scale protection for all cases of scaling.)

  • Page 72: Breakdown & Countermeasures

    BREAKDOWN & COUNTERMEASURES 10.1 Alarm and Red Status Lamp – Alarm ........72 10.2 Yellow Status Lamp – Caution ..........73 10.3 Action to be Taken before Ordering Repairs ......74 10.3.1 Bleeding Air from the Feed Water Pump ....78 10.3.2 Inspecting Water Level Probes ........

  • Page 73: Alarm And Red Status Lamp - Alarm

    Failure to do so may have serious consequences. Startup the boiler as described in Section 8.1: Boiler Startup. If the same alarm reoccurs, it may be the result of additional factors. In such a case, contact a MIURA sales office or your local dealer for further instruction.

  • Page 74: Yellow Status Lamp - Caution

    Details pertaining to the caution are presented on the display. NOTE In the case of certain caution, the display will request action that must be carried out by MIURA maintenance personnel. Refer to Section 10.3: Action to be Taken before Ordering Repairs for details regarding the correct action to be taken in response to a caution.

  • Page 75: Action To Be Taken Before Ordering Repairs

    If the cause of the alarm or caution persists, despite repair work having been carried out as instructed, immediately shut down the boiler as described in Section 8.3: Boiler Shutdown and contact a MIURA sales office or your local dealer for further instruction.
  • Page 76 Section CONTROL ALARM 3 8.3: Boiler Shutdown and contact a MIURA sales office or your local dealer for further instruction. A problem has occurred with the SAFETY STOP 1 combustion control system.
  • Page 77 EMERGENCY STOP An emergency stop device was activated. RESET as described in Section 8.3: Boiler Shutdown and contact a MIURA sales office or your local dealer for further instruction. An earthquake detector was activated, VIBRATION ALARM causing the boiler to shutdown.(not Reset the earthquake detector.
  • Page 78 The strainer is blocked or the blowdown valve is Clean the strainer and/or close the WATER CHECK 1 open. blowdown valve. Contact a MIURA sales office or WATER CHECK 2 The check valve is damaged. Miura representative for assistance. WATER CHECK 4 There is poor insulation in the water level probe.

  • Page 79: Bleeding Air From The Feed Water Pump

    10.3.1 Bleeding Air from the Feed Water Pump WARNING Water in supply lines for boilers connecting to a deaerator or hot water tank is extremely hot. For this reason, you should wait until the boiler’s water supply lines have sufficiently cooled down (at least two hours after boiler shutdown) before performing this work.

  • Page 80: Inspecting Water Level Probes

    Startup the boiler in accordance with the prescribed manual procedure. If the same alarm reoccurs, immediately shutdown the boiler and contact a MIURA sales office or your local dealer for further instruction. 10.3.3 Resetting the High Pressure Limit Shutoff Switch Carry out steps (1) and (2) from Section 10.1:...

  • Page 81: Resetting Blower Overcurrent

    Startup the boiler in accordance with the prescribed manual procedure. If the same alarm reoccurs, immediately shutdown the boiler and contact a MIURA sales office or your local dealer for further instruction. NOTE Short-circuiting or prolonged overloading of the blower motor will result in boiler shutdown.

  • Page 82: Specifications

    11 SPECIFICATIONS...
  • Page 83 Specifications and Emissions Please refer to separate boiler specification sheet for general specifications and emissions.
  • Page 84 Required wire gauge for power supply Please refer to the installation manual.

  • Page 85: Appendix

    12 APPENDIX...
  • Page 86 MIURA BOILER OFFICES WWW.MIURABOILER.COM...
  • Page 87 Description of Functionality Combustion Control Purging Purging is the process whereby the blower operates for a certain period of time prior to ignition in order to discharge any residual gas from the combustion chamber. Specifically, this is referred to as a “pre-purge.” Meanwhile, the term “post-purge”...
  • Page 88 Safety Devices If any of the following abnormalities should occur, the system will lockout combustion and activate an alarm. (1) Solenoid-valve leakage or false flame - If the flame sensor confirms the presence of a flame during purging (2) Emergency stop - If the emergency stop button is pressed (3) Misfire or flame failure - If the pilot burner does not light, or if the flame goes out after lighting of the pilot burner...
  • Page 89 The display will show the following whenever an alarm is activated in response to an abnormality or whenever a caution is issued. (1) Details of the abnormality (2) Instructions for required action Self-checking The control system hardware constantly monitors its own operation, and it will immediately shutdown operation when an abnormality occurs.
  • Page 90 The boiler can be fitted with a communications port as an option, allowing remote communication with external devices. Using this functionality, online maintenance can be carried out from a MIURA technical center and the boiler can be remotely monitored. Communicated information...

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