null  User manual
STEAM BOILER
OPERATION MANUAL
LX-50
LX-100
LX-150
LX-200
LXH-200
LXL-50
LXL-100
LXL-150
LXL-200
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 : T519-998-9000
Date of issue : July 31, 2007
Main Sections
1.
INTRODUCTION
4
2.
PURPOSE & PRINCIPLE OF OPERATION
14
3.
COMPONENT NAMES & FUNCTIONS
17
4.
BASIC PRECAUTIONS
22
5.
PRE-OPERATION INSPECTION
28
6.
USING BOILER CONTROLS
32
7.
PREPARING FOR STARTUP
44
8.
OPERATING THE STEAM BOILER
48
9.
INSPECTION & MAINTENANCE
52
10. BREAKDOWN & COUNTERMEASURES
70
11. SPECIFICATIONS
79
12. APPENDIX
91
1
Table of Contents
Main Sections .....................................................................................................................................................1
Table of Contents ................................................................................................................................................2
1
INTRODUCTION.........................................................................................................................................4
1.1
Safety Indicators................................................................................................................................5
1.2
Glossary ............................................................................................................................................6
1.3
Guarantee .........................................................................................................................................7
1.4
Introduction ........................................................................................................................................7
1.5
Features ............................................................................................................................................8
1.6
Description ......................................................................................................................................10
1.7
Acts & Regulations ..........................................................................................................................12
1.8
National Regulatory Organizations .................................................................................................13
2
PURPOSE & PRINCIPLE OF OPERATION .............................................................................................14
2.1
Flow Chart .......................................................................................................................................15
3
COMPONENT NAMES & FUNCTIONS ...................................................................................................17
4
BASIC PRECAUTIONS ............................................................................................................................22
4.1
Items to Check before Use ..............................................................................................................23
4.2
Clothing Requirements for Safe Operation .....................................................................................24
4.3
Warning Labels ...............................................................................................................................24
4.4
Dealing with Abnormal Conditions ..................................................................................................25
4.5
Precautions for Boiler Usage ..........................................................................................................26
4.6
Fire Extinguishers & First Aid Boxes ...............................................................................................26
4.7
Prohibition of Unapproved Modification ..........................................................................................27
4.8
When Reselling or Relocating .........................................................................................................27
5
PRE-OPERATION INSPECTION .............................................................................................................28
6
USING BOILER CONTROLS ...................................................................................................................32
6.1
Names & Functions of Control Panel Items ....................................................................................33
6.2
Working with the Display .................................................................................................................34
6.2.1
Display Content ...........................................................................................................................34
6.2.2
Using the Display (―DATA‖ & ―SELECT‖) ....................................................................................35
6.2.3
Display Content for Heat Management Mode ............................................................................36
6.2.4
Display Content for User Setting Mode ......................................................................................37
6.2.5
Display Content for Fault History Mode ......................................................................................40
6.3
Confirming Gauge Readings ...........................................................................................................41
6.4
Operating the Main Steam Valve .....................................................................................................42
7
PREPARING FOR STARTUP ...................................................................................................................44
8
OPERATING THE STEAM BOILER .........................................................................................................48
8.1
Boiler Startup ...................................................................................................................................49
8.2
Inspection during Operation ............................................................................................................50
8.3
Boiler Shutdown ..............................................................................................................................51
2
9
INSPECTION & MAINTENANCE .............................................................................................................52
9.1
Preparing for Possible Freezing ......................................................................................................53
9.1.1
Bleeding Water to Protect against Freezing ...............................................................................53
9.2
Maintenance during Extended Inactivity .........................................................................................54
9.3
Regular Maintenance Tasks and Timing .........................................................................................55
9.4
Spare Parts ......................................................................................................................................57
9.5
Overview of Inspection ....................................................................................................................58
9.5.1
Checking the Chemical Feeder ..................................................................................................58
9.5.2
Checking the Water Softness .....................................................................................................59
9.5.3
Checking the Gas Pressure ........................................................................................................60
9.5.4
Checking the Steam Pressure ....................................................................................................60
9.5.5
Blowdown & Testing of the Low Water Level Interlock ...............................................................61
9.5.6
Cleaning the Air Filter..................................................................................................................63
9.5.7
Cleaning the Feed-water Strainer ...............................................................................................64
9.5.8
Cleaning the Feed-water Tank ....................................................................................................66
9.5.9
Checking the Water Quality ........................................................................................................68
9.5.10 Inspecting the Safety Valve.........................................................................................................69
9.5.11 Cleaning the UV Sensor’s Protective Glass ...............................................................................69
10
BREAKDOWN & COUNTERMEASURES ..........................................................................................70
10.1
Alarm and Red Status Lamp – Alarm ..............................................................................................71
10.2
Yellow Status Lamp – Caution.........................................................................................................72
10.3
Action to be Taken before Ordering Repairs ...................................................................................73
10.3.1 Bleeding Air from the Feed Water Pump ....................................................................................76
10.3.2 Inspecting Water Level Probes ...................................................................................................77
10.3.3 Resetting the High Pressure Limit Shutoff Switch ......................................................................77
10.3.4 Resetting Blower Overcurrent .....................................................................................................78
11
SPECIFICATIONS ...............................................................................................................................79
12
APPENDIX...........................................................................................................................................91
3
1
INTRODUCTION
4
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.
WARNING
Failure to use the steam boiler correctly could
possibly lead to serious injury or death of the
user.
CAUTION
Failure to use the steam boiler correctly could
possibly lead to injury of the user or to property
damage.
NOTE
Important information from the point-of-view of
preventing boiler malfunction and ensuring
efficient operation, or information that will prove
useful during operation of the steam boiler.
Meaning of safety
indicators
The number contained within this symbol indicates a relevant
page.
This symbol is used to indicate forbidden actions.
Specific details of these actions will be presented together with
the symbol.
5
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.
Pre-purge
Purging with air from the boiler’s combustion chamber before the start of
combustion.
Post-purge
Purging with air from the boiler’s combustion chamber after the end of
combustion.
Pilot ignition
Ignition of the pilot burner.
Pilot only
A condition wherein only the pilot burner is lit.
Main ignition
Ignition of the main burner.
Low fire
A condition wherein combustion takes place at approximately 35% of maximum
combustion performance. (70% for the LX-50)
High fire
A condition wherein the boiler is operating at maximum combustion performance.
Scale
The buildup of water impurities such as calcium and magnesium on water tubes.
Sludge
Impurities that precipitate inside the boiler.
Untreated water
Water that has not yet been treated.
Soft water
Water which has had calcium and magnesium removed.
Boiler makeup (water)
Treated water that is supplied to the boiler, or the act of sending this water.
Equivalent evaporation
The mass of steam generated in one hour when water at 212F is changed into
steam at 212F.
Carry over
The unwanted discharge of moisture or impurities in the steam.
Blowdown
The discharge of water contained within the boiler.
Water tube
A tube making contact with combustion gas on the outside, and through which
boiler water flows.
Deaerator
A device used to heat the boiler makeup water in order to reduce the level of
oxygen dissolved in it.
Cavitation
A situation where air enters a pump and prevents normal operation.
6
Guarantee

Refer to your warranty documents for specific details.

A six-month labor warranty from boiler startup may be available. Contact local sales and service
representatives for details. This labor warranty covers routine inspection and repairs at the installation
site. Travel and lodging expenses are not covered, except in the case of local representatives.

This product is covered by a one-year standard parts warranty from the boiler commissioning date or
for 18 months from the shipping date, whichever occurs first. Express shipping costs for overnight or
next-day delivery of parts are not included. Damage to the boiler or any of its component parts after
leaving the factory is not covered. Parts replaced under this warranty must be returned to MIURA. If any
defective parts are not returned, you will be charged for the corresponding new item.

This product’s pressure vessel is covered by a seven-year limited factory warranty against material or
workmanship defects.
Introduction
MIURA Boiler Co., Ltd. began North American activities in 1988, when the manufacturing plant in Brantford,
Ontario, was established. Subsequently, our engineering department developed procedures to meet ASME
codes and to gain listing approval from UL, CSA. The United States corporate sales office, MIURA Boiler,
Inc., was then established and has since developed relationships with national, state and city inspectors and
agencies.
Our North American network consists of branches in Atlanta, Chicago, Los Angeles, New York, and Ontario.
The parent company, MIURA Boiler Ltd. of Japan, is the leading manufacturer of boilers and other thermal
equipment in the Pacific Rim region with market share in excess of 55%. Operating factories in five countries,
our production volume now exceeds 14,000 units per year.
As a result of design necessities in Japan — such as limited space and a total dependence on foreign
energy — the MIURA Steam Boiler has been engineered with a highly efficient, vertical water tube, oncethrough, forced-flow design. Featuring a compact unit with low water content, the MIURA Boiler is designed
to be run with simple push-button controls and a minimum amount of maintenance. Operation is quiet,
radiant heat losses are minimal, and steam quality is second to none. Furthermore, MIURA Boilers are often
installed in a multiple boiler network.
MIURA Boilers, in combination with the patented MIURA Multiple Installation panel, allow the required
horsepower to be brought on and off line quickly in order to meet sophisticated production needs with
maximum fuel economy. The MIURA Advantage — proven in the field over forty 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
amount of energy and having the lowest environmental impact. In recognition of its compact, safe, and costeffective design, the high-efficiency MIURA Boiler has won numerous awards from engineering societies and
gas associations.
7
Features
The MIURA Steam Boiler features a once-through, forced flow, low water content, water-tube design, which
can achieve full output within five minutes. What’s more, this boiler is designed to be run with simple pushbutton controls and a minimum amount of maintenance. Using the patented MIURA BL11 computer
controller, we can monitor precise characteristics of boiler operation from our offices and provide fast,
accurate feedback data. Radiant heat losses are minimal and steam quality is second to none. In addition,
MIURA Boilers are often installed in a multiple boiler network.
MIURA Boilers, in combination with the patented MIURA Multiple Installation panel, allow the required
horsepower to be brought on and off line quickly in order to meet sophisticated production needs with
maximum fuel economy. The high-efficiency MIURA Boiler has received numerous accolades in Japan,
including awards from the Japanese Society of Mechanical Engineers and the Japanese Gas Association.
This boiler is characterized by compact, safe, cost-saving performance — an advantage that is underscored
by our greater than 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.
NOx (PPM)
All NOx Concentrations Converted to 3% Excess Oxygen
(measured by authorized laboratories)
Rated Load (%)
NOX TEST DATA
It is generally accepted that the temperature of a combustion flame should be less than 3,272F (1,800C) in
order to prevent NOx generation. Nevertheless, combustion flames will generally have some high
temperature areas generating this harmful pollutant. Miura engineers determined the temperature distribution
in the combustion and heat exchanging areas of our boilers, and through exhaustive theoretical analysis and
rigorous testing, optimized the boiler design so as to have a uniform temperature distribution at less than
3,272F (1,800C). Specifically, an ideal combustion process was achieved by making the burner surface as
large as possible, and the furnace volume as small as possible. As a result, the LX and LXL boast NOx
emission levels of less than 20 PPM at 3% converted O2 (based on natural gas combustion).
Thanks to its highly compact design, the LX fits through a standard door opening, thereby eliminating the
need to demolish doorways or knock down walls during installation.
8
The completely packaged LX features the following as standard:

UL, c-UL approved and labeled boiler design (FM available)

HIGH GAS and LOW GAS pressure switches

LOW AIR pressure switch

Control Steam Pressure transducer with a backup control pressure switch

High steam limit pressure switch featuring a manual reset

ASME steam safety relief valves for the boiler and an optional economizer

Main gas line and pilot line regulators

Dual pilot-gas solenoid valves

Dual main-gas fluid actuator valves and plugged leak-test port (vent valve also available)

Forced-draft blower and motor

Completely enclosed, heavy gauge casing

ASME stamped pressure vessel with internal inspection ports

Two independent low-water fuel cutoffs, one featuring a manual reset

Digital steam-pressure display with a backup pressure gauge

Thermocouples on water tubing in order to prevent overheating due to low water or scale buildup

Water volume control

Intermittent Automatic Blowdown system with a strainer and manual shutoff valve

External separator

Blower-cover dust warning

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
9
Description
The following answers frequently asked questions by providing a general overview of the design and
operational characteristics of MIURA Boilers.
The MIURA boiler design comprises straight water tubes between upper and lower headers. Both headers
are encased in a castable refractory leaving only the tubes exposed to combustion gases. There is very little
water and consequently very little energy stored within the steam boiler. Water remains exclusively inside the
tubes, with only incidental bubbling in the upper header. Therefore, the design features no natural circulation
such as the riser or downcomer effect common to natural circulation boilers.
Water is forced into the bottom header and tubes by means of a feed water pump. The water is flashed into
steam in the tubes, realizing a dynamic bubbling system that also cools the tubes. This bubbling action may
be best described as a ―steam gradient,‖ with more steam at the top of the tubes than at the bottom. Steam
is accumulated in the upper header with a final separation in the external separator. Condensate separated
in the external separator is fed back into the lower header.
As a result of this steam gradient characteristic, there are no strictly defined steam and water levels, and
thus, the boiler requires no sight glass. Furthermore, special modifications are incorporated into the boiler
construction and safety system in order to accommodate this.
First of all, the water control system relies on an electrical conductance system — specifically, when water
makes contact with a probe, a circuit is formed. Three such probes control the boiler feed, with a short probe
for low-fire, a medium length probe for high-fire, and a long probe for low water cutout. 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. Control of this dynamic system has been made possible by adding a special modification in the
form of the water column in order to create an artificial level. The flanged pipe leading from the boiler body
runs through the column, with three holes drilled in the pipe to realize an orifice effect. Nevertheless, even
with this orifice effect, the artificial level oscillates — especially with swings in system load. This oscillation is
desired and is directly proportional to the volume of water in the boiler tubes.
Secondly, the water volume control relies on electrical resistance, and the bubbling action is what cools the
tubes. As the volume of water in the steam boiler is consumed, there is less bubbling at the top of the tubes,
increasing the amount of electrical resistance. Should the water volume ever become so low as to lose
effective contact with the low-water cutout probe, the boiler will shut down. In certain models, an extra probe
will activate the feed water pump until the bubbles re-establish effective contact with the probe.
Third in the list of safety modifications are thermocouples, attached directly to the tubes. These
thermocouples measure the temperature of the tubes and will shut down the boiler if a low water volume
condition is detected due to insufficient bubbling, if dry fire occurs, or if scale buildup is detected. Scale
formation reduces heat transfer rates and is therefore monitored directly based on any increase in tube
surface temperature. This temperature sensing method can detect scale buildup of less than 1/64‖ and will
shut down the boiler if necessary. The early detection of scale formation is an important factor in maintaining
a high efficiency boiler. According to the US National Bureau of Standards, 1/4‖ of scale buildup on heating
units requires up to 55% more energy to attain the same temperature. Other methods of detecting scale,
such as a pressure gauge on the discharge of the feed water pump, are much less sensitive.
The boiler will not operate should any of these low-water safeties fail. Only through tampering could the
boiler operate without these safeties and give rise to a dry fire condition. Even in the unlikely event that such
a situation should occur, by the time the tubes superheat to the level required to overcome the steel’s tensile
strength, the amount of energy contained in the remaining water would be so small that the possibility of a
pressure explosion is negligible. The MIURA Steam Boiler design has been used for more than 40 years,
and over 200,000 units are presently in operation worldwide. There is no record of ANY pressure vessel
explosion.
10
Steam is produced within five minutes from cold start-up and selected tubes can be visually inspected
through two-inch openings located in the top and bottom headers. 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, the CSA, and the CGA, and it can be tuned to meet FM and/or ASMECSD1 requirements at the customer’s request.
Please note that all flanges used on our boilers are class 150# (300# for the LXH) and comply with
ASME/ANSI standard B16.5. The 150# stamping refers to a standard classification, and not the Maximum
Allowable Working Pressure (MAWP). As specified in Table A-361 of ASME codes, Section I, 2004 edition,
the MAWP for 150# flanges is 205 PSIG for saturated steam services and 170 PSIG for boiler-feed and
blowdown line services. This specification matches the 170 PSI MAWP rating of the LX boiler.
CAUTION
All steam systems require continuous, appropriate water treatment. This treatment is mandatory from the time
of installation of your MIURA Steam Boiler. Failure to follow the recommended water treatment and
maintenance procedures could shorten the service life (and efficiency) of your boiler and could also affect the
warranty.
11
Acts & Regulations
There are a number of codes, standards, laws and regulations for boilers and related equipment that and
should be considered. Regulatory requirements are dictated by a variety of sources and are focused
primarily on safety. This equipment shall be installed in accordance with the current regulations, codes, and
specifications of the applicable municipal, national, provincial, state, and/or federal agencies. Authorities
having jurisdiction should be consulted before the commencement of installation work. 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
rules to take into consideration:
a.
The boiler industry is tightly regulated by the American Society of Mechanical Engineers
(ASME) and ASME codes, which control boiler design, inspection, and quality assurance. All
boiler pressure vessels — including economizers, deaerators, blowdown tanks, and the like —
should have an ASME stamp.
b.
All pressure vessels should be inspected and registered with the National Board.
c.
In Canada, the design of all boilers, pressure vessels, fittings, and piping must be registered
with your local province as required in CSA B51.
d.
The insurance company insuring your facility or boiler may dictate additional requirements.
Boiler manufacturers can provide special boiler trim according to the requirements of major
insurance companies such as IRI and FM. Special boiler trim items usually take the form of
added safety controls. Some industries — such as food processing, brewing, or
pharmaceuticals — may also have additional regulations that have an impact on the boiler and
boiler room.
e.
CSA/CGA, c-UL, UL approval may be required in order to verify safe boiler performance.
f.
A full-time boiler operator may be required. Operator requirements depend on the boiler’s size,
pressure, heating surface area and volume of water. Boilers can be selected to minimize the
boiler operator requirements, either by choosing a boiler that is exempt from certain rules, or by
installing special equipment that gives the operator more freedom within the facility. Contact
your local boiler inspector for more details.
g.
Most state, provincial, and local authorities have a permit that must be acquired in order to
install and operate a boiler. Additional restrictions may apply in non-attainment areas where air
quality does not meet the national ambient air quality standards and where emission regulations
are more stringent. Be sure to investigate these requirements before purchasing a boiler.
h.
Most states or provinces require an annual boiler inspection, and additional requirements may
also apply to piping.
i.
Most regional authorities have established a maximum temperature at which water can be
discharged to the sewer system. In such a case, a blowdown separator or blowdown tank will be
required.
j.
U.S. Federal emission standards — including permit and report-related procedures — apply to
all new boilers with inputs over 10 million BTU/Hr.
k.
Boiler ratings are based on operation at sea level. For operation at elevations above 2,000 feet
(600 m), ratings must be reduced at a rate of 4% per 1,000 feet (300 m) above sea level.
12
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.
UNDERWRITERS LABORATORIES
333 Pfingsten Rd.
Northbrook, IL
60062
(847) 272-8800
CSA INTERNATIONAL
178 Rexdale Blvd.
Toronto, Ontario
M9W 1R3
(416) 747-4000
NATIONAL BOARD
1055 Crupper Ave.
Columbus, OH
43229
(614) 888-8320
T.S.S.A.
3300 Bloor St., West
16th Floor, Centre Tower
Toronto, Ontario M8X 2X4
(877) 682-8772
A.S.M.E.
345 East 47th St.
New York, NY
10017
(212) 705-7800
N.F.P.A.
1 Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9101
(800) 344-3555
AMERICAN GAS ASSOCIATION
1515 Wilson Boulevard
Arlington, VA 22209
FACTORY MUTUAL RESEARCH CORPORATION
1151 Boston-Providence Turnpike,
Norwood, MA 02062
(617) 762-4300
OCCUPATIONAL SAFETY & HEALTH
ADMINISTRATION
LOCAL FIRE MARSHAL
AMERICAN NATIONAL STANDARD INSTITUTE
11 West 42nd Street,
New York, NY 10036
LOCAL BOILER INSPECTORS
ENVIRONMENT PROTECTION AGENCY
LOCAL BUILDING AND CONSTRUCTION
INSPECTORS
FOOD & DRUG ADMINISTRATION
13
2
PURPOSE & PRINCIPLE OF OPERATION
2.1 Flow Chart ............................................................................... 15
14
Flow Chart
■ Hard-Leak Alarm (Colormetry) ■ Chemical Feeder
Monitors the treated soft water
after the water softener.
Feeds chemicals into the boiler in
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.
If this water is used without removing the impurities in advance, buildup of scale, carry-over, corrosion, and
other similar factors would have a detrimental effect on the boiler’s efficiency and service life. For this reason,
the installation of water treatment equipment and thorough control of water quality are critical.
The above flowchart sets forth a standard for water treatment system.
15
■ Boiler Makeup Tank
Main gas valve
Main feed water valve
Two different varieties of
boiler makeup tank are
available – namely, the water
tank and the deaerator tank.
■ Once-through steam boiler
Main
power
Gas
16
Circuit
breaker
Water delivered to the inside of
the tubes is heated by the
combustion of fuel using a burner.
As a result of this heating, the
boiler water successively
evaporates to form steam, which
is then supplied to the load
application.
3
COMPONENT NAMES & FUNCTIONS
17
LX-200SG
Blower
Delivers the air required for
combustion into the
combustion chamber.
Pressure gauge
Displays the level of steam
pressure within the pressure
vessel.
Control panel
Provides switches and
display devices required
for operating the boiler.
Emergency stop button
In an emergency, push
this button to stop
combustion
18
Safety valve
Allows pressure to escape from the
pressure vessel when it reaches an
abnormal level (i.e., exceeding the
maximum pressure).
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.
19
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. BASIC PRECAUTIONS.
20
LX BOILER SECTION VIEW
21
4
BASIC PRECAUTIONS
4.1 Items to Check before Use ...................................................... 23
4.2 Clothing Requirements for Safe Operation ............................. 24
4.3 Warning Labels ........................................................................ 24
4.4 Dealing with Abnormal Conditions .......................................... 25
4.5 Precautions for Boiler Usage ................................................... 26
4.6 Fire Extinguishers & First Aid Boxes ....................................... 26
4.7 Prohibition of Unapproved Modification................................... 27
4.8 When Reselling or Relocating ................................................. 27
22
WARNING
The following precautions must all be observed before operating the boiler.
Failure to do so may result in injury.
Items to Check before Use
Check the boiler’s installation condition.
Check the boiler’s
installation condition.
Confirm that it has been
installed correctly as set
forth in SECTION 5. PREOPERATION
INSPECTION.
Trial operation must always be performed before
actual use.
When you have confirmed
that the boiler is correctly
installed, please arrange
for trial operation to be
conducted by MIURA
maintenance personnel
or distributor.
Ensure that you use the boiler correctly.
Do not attempt to operate
or service the steam
boiler until you have read
and fully understood this
operation manual.
23
Clothing Requirements for Safe Operation
Be sure to wear suitable clothes for working on the
boiler.
To operate or service
this steam boiler, avoid
wearing loose clothes or
accessories that could
become caught on
valves or other
mechanical components.
In addition, clothing
stained with oil or
grease poses a fire risk
and it should not be
worn.
Always wear protective clothing.
Helmet, safety glasses,
safety footwear, and
leather gloves must
always be worn.
Handling of hazardous
chemicals may cause
injury when contact with
eyes or skin. Therefore,
it is crucial that safety
glasses and rubber
gloves should be worn
during this dangerous
operation.
Warning Labels
Location of warning labels
Warning labels have been
applied to indicate
locations where hazards
exist.
For more details
regarding these locations,
refer to SECTION 3:
COMPONENT NAMES &
FUNCTIONS.
Maintenance of warning labels
Any peeling or torn
warning labels must be
replaced.
Please contact a MIURA
sales office or your local
dealer regarding this and
other warning-label
inquiries.
24
WARNING
The following precautions must all be observed before operating the boiler.
Failure to do so may result in injury.
Dealing with Abnormal Conditions
Immediately push the "EMERGENCY STOP" button to stop combustion and close the main gas valve first,
then cut out the main power supply to the boiler whenever you notice abnormal noise, strange smells, black
smoke, gas leaks, or any other unusual conditions. Failure to react to this precaution may result in fire or gas
explosion.
No ignition source near gas leaks
When a gas leak is suspected,
open windows and doors to
ventilate the area. You must
not turn fans or other
electrical devices on or off
without good reason in such
situation. Failure to observe
this precaution may result in
explosion.
E
S
M
T
E
O
R
P
G
E
N
C
Y
Ventilation
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.
Failure to observe this
precaution can result in fire,
explosion, and other
dangerous situations.
25
Precautions for Boiler Usage
Always use the recommended fuel.
Usage of any fuels other
than those recommended
could result in the boiler
explosion.
No ignition source near boiler fuel or combustible
materials.
Boiler fuel and highly
flammable material can
easily be ignited in the
presence of a ignition source.
No combustible
materials should be
present within the
minimum distance of
the boiler required by
the local code.
Failure to observe this
precaution may result in fire.
Do not place combustible
materials inside the control box.
Failure to this precaution may
result in fire.
Always store flammable materials in a safe location,
away from ignition source.
Failure to observe this precaution may result in fire.
Use ventilation equipment (or air vents) during
operation.
Fans should be running during operation of the
boiler, and ensure ventilation ports are not blocked.
Failure to observe this
precaution could result
in incomplete
combustion, which in
turn could lead to
carbon monoxide gas
poisoning or boiler
explosion.
Do not touch the boiler during operation.
With the exception of
the control panel,
avoid contact with any
part of the boiler while
it is operating.
Failure to follow the
precaution can result in
electric shock, burns, and
other injury.
NEVER BURN GARBAGE OR PAPER IN THE UNIT
Fire Extinguishers & First Aid Boxes
Provide fire extinguishers.
In order to be prepared for
the outbreak of fire,
ensure that fire
extinguishing equipment
is provided near the boiler,
and that its operation is
fully understood.
Provide a first aid box.
Select suitable locations
for the first aid boxes, and
ensure that they are
always there.
26
WARNING
All the following precautions must be observed before operating the boiler.
Failure to do so may result in injury.
Prohibition of Unapproved Modification
No customizing or modification
Any customizing or modification of
the boiler other than that
recommended by MIURA (for
example, connection to additional
equipment and piping work) can
have serious consequences in
terms of safety.
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
Whenever the boiler is to
be relocated, it is
important that the
installation work be
carried out correctly and
the required equipment
for moving is available.
Always contact a MIURA
sales office or your local
dealer before moving or
reselling the steam boiler.
Inappropriate installation
work or the connection of
unsuitable ancillary
equipment can result in
injury and must be
avoided.
Include the operation manual if reselling
This operation manual
must be read by all who
intend to use the boiler.
This manual must be
given to the new use
27
5
PRE-OPERATION INSPECTION
Refer to the “INSTALLATION MANUAL” for more details.
28
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.
Insufficient ventilation can result in incomplete
combustion, which in turn can lead to carbon
monoxide gas poisoning or boiler explosion.
Ventilation fan
Air supply and
exhaust vent
 Boiler Installation
Installation on a non-flammable floor
Confirm that the boiler is installed on a floor that
is not made of wood or another flammable
material.
Installation on a flammable surface can lead to
the outbreak of fire and have other undesirable
consequences.
Combustible materials should distant from the boiler
Hazardous materials with flammable nature
should not be handled near the boiler, and
combustible materials should be located at the
minimum distance required by local code.
Flammable material
Minimum distance
required by local code
 Fuel Piping
No fuel leaking from piping
Installation of gas leak alarm LPG-fired boilers
must be provided with gas-leak alarm
equipment.
This fuel is heavier than air and builds up close
to the ground, where it is not easily noticed. It is
crucial that you provide a gas leak alarm in
order to prevent explosion.
Combustible materials
10 ft. approx
Gas leak alarm
29
 Electrical Work
Failure to observe warnings relating to electrical
work can lead to electric shock.
Fuse or circuit breaker
Dedicated power supply for the boiler
Confirm that the boiler has a dedicated supply
of main power and a dedicated breaker
installed on the power-supply line.
Fuse or Circuit breaker
capacity
Installation of a fuse (or a time-limit type circuit
breaker)
Confirm a fuse (or a time-limit type circuit
breaker) is installed on the main power supply
line. The rating of the fuse is on the boiler
name plate. Please refer to SECTION 11:
SPECIFICATIONS.
Power supply lines with the required wire gauge
Confirm the wire gauge of the power supply
lines is as required.
For more details regarding power-supply line
gauges, please refer to SECTION 11:
SPECIFICATIONS.
Ground terminal connected to a grounding wire
Confirm that a grounding wire is connected to
the ground terminal located inside the boiler’s
control box.
Wiring
Ground
Ground terminal
 Chimney Installation
Non-flammable parts in contact with chimney path
Confirm that any section of roof or wall which
the chimney passes through is made of nonflammable material. Flammable material in the
vicinity of the chimney poses fire hazard.
6 inches minimum
Screw
Seal
Area around chimney outlet should be free of
combustible material
Confirm that no flammable materials are
present near the chimney outlet. Any
flammable material in that area poses fire
hazard.
Non-flammable material
Properly sealed and secured joints
Confirm that joints have been properly sealed
and secured in place. If this is not the case,
exhaust gas may leak and rise the risk of
carbon monoxide poisoning.
2 ft.
or more
3 ft.
or more
30
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
Confirm the end of the safety valve’s
discharge piping is pointed in a direction that
would not endanger anyone when steam is
discharged.
If this is not the case, discharged steam could
cause burns and other injuries.
Safety
valve
Discharge piping
Drain piping
No movement of discharge piping during discharge
Confirm by hand that the discharge piping is
secured in place.
If this is not the case, the piping could move in
reaction to the discharge of steam, which
could then cause burns and other injuries.
Thermal insulation
 Steam Piping
Fully insulated steam piping
Confirm that any sections of steam piping
passing through inflammable walls are fully
insulated.
Insufficient insulation can result in the
outbreak of fire.
Wall
 Blowdown Piping
No movement of the piping during blowdown
Confirm by hand that the blowdown piping is
secured in place. If this is not the case, the
piping could move in the reaction of steam
discharge, which could then cause burns and
other injuries.
Blowdown piping
Pit
31
6
USING BOILER CONTROLS
6.1 Names & Functions of Control Panel Items ............................ 33
6.2 Working with the Display ......................................................... 34
6.2.1 Display Content ............................................................. 34
6.2.2 Using the Display (―DATA‖ & ―SELECT‖) ...................... 35
6.2.3 Display Content for Heat Management Mode ............... 36
6.2.4 Display Content for User Setting Mode ......................... 37
6.2.5 Display Content for Fault History Mode ........................ 40
6.3 Confirming Gauge Readings ................................................... 41
6.4 Operating the Main Steam Valve ............................................ 42
32
Names & Functions of Control Panel Items
 Names & Functions of Switches
Status lamps
Display
―DATA‖ button
• To select parameters for individual
modes of operation such as
Monitoring mode and Heat
Management mode.
• To turn off audible alarms.
• To reset the display after the
output of cautions.
Emergency Stop button
To shutoff main control power and stop the
boiler in the case of emergency.
(In normal situations, use the ―OPERATION‖
switch to stop the boiler.)
33
―SELECT‖ switch
To switch between parameters for each
mode of operation, to modify values, and to
select individual characters.
―OPERATION‖ switch
• To start water-level control, chemicalcharging control, and combustion within the
boiler.
• To reset alarms and the display of cautions.
Working with the Display
6.2.1
Display Content
 Operation Status & Parameters (Monitoring
mode)
Typical display:
Upper row of display:
Boiler operation mode
HIGH FIRE
STEAM
NOTE
If switches are not operated for a period of time, the
system will automatically switch over to Monitoring
mode and the display will show steam-pressure data.
100PSI
Lower row of display:
Monitoring data for
selected parameter
Status presented in upper row of display
DISPLAY CONTENT
DISABLE
STAND-BY
FEED WATER
PREPURGE
IGNITION
PILOT
MAIN IGNITION
LOW FIRE
HIGH FIRE
POSTPURGE
PILOT HOLD
LOW FIRE HOLD
PREPURGE HOLD
BOILER OPERATION
MODE
Operation stopped
Standby
Low water level interlock
Pre-purge
Pilot ignition
Pilot only
Main ignition
Low fire
High fire
Post-purge
Pilot fire hold
Low fire hold
Pre-purge hold
Parameters presented in lower row of display
MONITORED
TYPICAL OUTPUT
PARAMETER
Steam Pressure
STEAM
999PSI
Exhaust Gas Temperature
FLUE GAS 999F
Feed Water Temperature
FEED WATER 999F
Scale Monitor Temperature SCALE MNTOR
999F
Overheat Thermostat
HIGH LIMIT
999F
Temperature
Flame Current
FLAME
99.9μA
Remaining Blowdown Time NEXT B/DOWN 999Hr
Condensate Blowdown
SFCE B/DOWN ON/OFF
Valve On / Off
Water Conductivity
CONDUCT 9990μS
Water Level Condition
W/LEV L2 LMSD SS
Date & Time
MM/DD/YY HH:MM
34
 Purpose of Each Mode
Monitoring Mode
In this mode, data required for boiler control such as the steam pressure and exhaust
gas temperature is presented.
Refer to page 34 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.
Refer to page 36 for more details regarding the actual display content.
User Setting Mode
This mode is used to make steam pressure and time settings.
Refer to page 37 for a description of how to set the system time (i.e., program-time
setting).
Fault History Mode
Use this mode to view the content of the seven most recent alarms and cautions,
together with the corresponding times of occurrence.
Refer to page 40 for more details on how to view this content.
The four operation modes – Monitoring, Heat Management, User Setting, and Fault History – can be
displayed using the ―DATA‖ button.
6.2.2
Using the Display (―DATA‖ & ―SELECT‖)
 Using the ―DATA‖ Button
Press the ―DATA‖ button to scroll through the four operation modes – Monitoring, Heat Management, User
Setting, and Fault History.
DATA
Monitoring

Heat Management

User Setting

Fault History
 Using the ―SELECT‖ Switch
Turn the ―SELECT‖ switch to change the displayed parameter or the corresponding value.
SELECT
35
6.2.3
Display Content for Heat Management Mode
You can display a total of 11 heat-management parameters in Heat Management mode, with the
corresponding values being presented in the lower row.
Typical display:
Boiler’s current mode of operation
HIGH FIRE
IGN CYCLE
9999
Heat Management Parameters
Parameters displayed for Heat Management mode
1
HEAT MANAGEMENT
PARAMETER
Ignition Cycles
IGN CYCLE
9999
2
Gas-fired Low Fire Duration
GAS L HRS
99:99
3
Gas-fired High Fire Duration
GAS H HRS
99:99
GAS L TEMP
999F
1F
GAS H TEMP
999F
1F
FW AVG TEMP 999F
1F
№
7
Gas-fired Average ExhaustGas Temperature (low fire)
Gas-fired Average ExhaustGas Temperature (high fire)
Average Feed Water
Temperature
Gas-fired Boiler Efficiency
8
4
5
6
DISPLAY OUTPUT
RESOLUTION
1
Hours:
Minutes
Hours:
Minutes
GAS EFFIC
99.9%
0.1%
Gas Consumption
GAS U
999999SCF
1 SCF
9
Boiler Makeup Water
F WATER
99999GAL
1 Gal
10
Steam Generated
STEAM
999999LB
1 Lb.
11
Surface Blowdown Volume
B/DOWN
99999GAL
1 Gal
For these parameters, the display
shows cumulative value from the
Segment Start Time of the current
day to the current time (or for the
Segment Interval).
For these parameters, the display
shows cumulative value from the
Segment Start Time of the current
day to the current time (or for the
Segment Interval).
For these parameters, the display
shows cumulative value from the
Segment Start Time of the current
day to the current time (or for the
Segment Interval).
(Segment Start Time)
The value displayed
corresponds to the 24-hour
(Segment Start Time)
period from the previous
Segment Start Time to the
current Segment Start Time.
The value displayed
corresponds to the interval
from 00:00 to 01:00.
The value displayed
corresponds to the interval
from 00:00 to 02:00.
*: 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.
36
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. Although the time is set before the boiler is shipped from the
manufacturing plant, you should check to confirm that it is correct.
DATA
1)
Press the ―DATA‖ button to select User Setting
mode.
2)
Press and hold the ―DATA‖ button for two seconds
to switch to User Setting mode.
Parameters for this mode change as follows in
response to pressing of the ―DATA‖ button.
INI SET MODE
PRESS&HOLD―DATA‖
DATA
Steam Pressure (low fire)

Differential (low fire)

Steam Pressure (high fire)

Differential (high fire)

Time: Month

Time: Day

Time: Year

Time: Hours

Time: Minutes

Air Bleed
3)
STEAM SET(L)
100PSI
STEAM SET(L)
100PSI
To exit User Setting mode, again press and hold
the ―DATA‖ button for two seconds.
37
DATA
 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
1)
Press the ―DATA‖ button to select User Setting
mode.
2)
Press the ―DATA‖ button to select the steam
pressure setting to be changed.
INI SET MODE
PRESS&HOLD―DATA‖
DATA
PARAMETERS
Steam Pressure (low fire)
Differential (low fire)
Steam Pressure (high fire)
Differential (high fire)
3)
DETAILS
If the pressure of steam inside the pressure vessel reaches or
exceeds this setting, the boiler will switch to low-fire operation.
Furthermore, the boiler will return to high-fire operation if the
pressure of steam inside the pressure vessel drops to (Steam
Pressure (low fire) – Differential (low fire)).
If the pressure of steam inside the pressure vessel reaches or
exceeds this setting, the boiler will switch to stand-by.
Furthermore, the boiler will restart combustion if the pressure of
steam inside the pressure vessel drops to (Steam Pressure (high
fire) – Differential (high fire)).
Use the ―SELECT‖ switch to change a pressure
setting.
SELECT
NOTE
Do not change either Steam Pressure
value (i.e., for high or low fire) to 150
PSI or higher.
If you wish to operate the boiler in this
elevated range, please consult with a
MIURA sales office.
STEAM SET(L)
100PSI
STEAM SET(L)
100PSI
4)
When you have finished changing settings, press
and hold the ―DATA‖ button for two seconds to
leave User Setting mode.
Settings are updated as you leave this mode.
Failure to carry out this action will result in the
original settings remaining unchanged.
5)
Confirm that the pressure settings have been
changed as intended.
38
DATA
 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
1)
Press the ―DATA‖ button to select User Setting
mode.
INI SET MODE
PRESS&HOLD―DATA‖
DATA
2)
Press the ―DATA‖ button to select the Time Setting
screen.
The current month will start to flash.
When a setting flashes in this way, its value can be
changed.
TIME SET
07/01/06
08:00
DATA
3)
Using the ―DATA‖ button, move to the setting that
you want to change.
4)
Use the ―SELECT‖ switch to change the setting as
required.
5)
When you have finished changing the settings,
press and hold the ―DATA‖ button for two seconds
to leave User Setting mode.
Settings are updated as you leave this mode.
Failure to carry out this action will result in the
original settings remaining unchanged.
6)
Confirm that the date and time have been changed
as required.
39
TIME SET
07/01/06
08:00
SELECT
TIME SET
07/01/06
DATA
13:00
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.
DATA
1)
Select Fault History mode using the ―DATA‖ button.
2)
Press and hold the ―DATA‖ button for two seconds
to switch to Fault History mode. In addition, you
can use the ―SETTING‖ switch to display the
possible causes of alarms and cautions.
FAULT HISTORY
PRESS&HOLD―DATA‖
DATA
Typical display:
Stage triggering
alarm or caution
Operating mode, date, and time at triggering of alarm or caution
Operating mode, date, and time at triggering of warning or system notice
HI FIRE 11,08:30
BURNER ALARM 5
Details of alarm or caution
Typical display of possible causes:
NO FUEL or UV
SENSOR ERROR
3)
To exit Fault History mode, press and hold the
―DATA‖ button for two seconds.
40
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>
NOTE
As a result of the different
measurement-error characteristics of
the analog and digital displays, there
may be a slight difference in the
pressures indicated by each.
HIGH FIRE
STEAM
 Water Level Display
The control system provides information regarding the
amount of water in the boiler in terms of electrode
conditions.
The display presents the status of the electrode on which
water is detected.
100PSI
HIGH FIRE
W/LEV L2 LMSD SS
Water level: Low
High
Displayed by default during combustion.
41
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.
As the entire boiler will remain at a high temperature for some time after shutdown, avoid to touch any
boiler part other than the handle of the main steam valve. Failure to follow this precaution can result in
burns and other injuries.
NOTE
If a steam header has been installed on the piping, ensure that the main steam valve is
left open.
In this type of setup, the steam header’s valve will act as the main steam valve for the
boiler.
1)
Setup a ladder.
Open
2)
3)
Confirm that the position of the valve and the
required direction of turning in advance.
Close
Handle
Main steam valve
Climb the ladder and open or close the main steam
valve as required.
WARNING
Do not jump on or jump off the ladder.
You must keep both hands and one foot, or both feet and one hand in contact with the ladder at all times
when ascending or descending. Failure to observe this precaution may result in a fall and the associated
injury.
42
43
7
PREPARING FOR STARTUP
44
 The following checks must be carried out before starting the boiler.
1)
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
servicing.
NOTE
Even when the boiler is not in use, the main-power
breaker should not be turned off. If the boiler receives
no power for an extended period of time, the data
stored in its memory will be lost. In addition,
communication will not be possible if no power is being
supplied.
2)
Open
Open the pressure vessel’s air bleed valve for
approximately five seconds, and then fully close
the valve.
WARNING
Never open the pressure vessel’s air bleed valve
when the boiler is pressurized, no matter how small
the pressure level. You must always confirm that the
steam pressure gauge reads 0 PSI at this time.
Opening the valve at any pressure above 0 PSI will
result in the discharge of steam, which could cause
burns and other injuries.
Open
3)
After confirming that the feed water tank is at least
two-thirds full of water, open the main feed-water
valve.
4)
Open the main gas valve.
As described in Section 9.5.3: Checking the Gas
Pressure, confirm that the value indicated by the
gas pressure gauge is within the rated range.
45
Open
5)
As described in Section 9.5.2: Checking the Water
Softness, confirm that the feed water has been
correctly softened.
6)
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
and close the valve.
46
Close
47
8
OPERATING THE STEAM BOILER
8.1 Boiler Startup ........................................................................... 49
8.2 Inspection during Operation .................................................... 50
8.3 Boiler Shutdown ...................................................................... 51
48
Boiler Startup
1)
Perform the checks described in SECTION 7: PREPARING FOR 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.
2)
Turn on the ―OPERATION‖ switch.
The Status lamp will light in green, and the system will
begin water level control. The Status lamp will light in
red at this time if the water level is too low.
3)
When the normal water level has been reached,
the Status lamp will turn green and pre-purging will
begin. Combustion will follow pre-purging.
When the pre-purge has been completed, the control
system will perform ignition on pilot burner.
Following main ignition, the system will perform low
fire combustion for approximately 10 seconds, before
switching to high fire.
WARNING
Steam pressure gauge
Fans and other ventilation equipment must be turned
on at this time. Insufficient ventilation can result in
incomplete combustion, which in turn can lead to
carbon monoxide gas poisoning or boiler explosion.
4)
Stand by until the pressure level indicated by the
steam pressure gauge reaches the rated level (i.e.,
at least 70 PSI).
5)
Applying the method described in Section 6.4:
Operating the Main Steam Valve, slowly open the
main steam valve.
The boiler will alternate high-fire combustion and lowfire combustion in order to deliver steam at the rated
pressure level.
49
Open
Main steam valve
Inspection during Operation
WARNING
At any time, when a gas leak is suspected, immediately turn off the ―OPERATION‖ switch, close the main
gas valve and open windows and doors in order to fully ventilate the area around the boiler. You must never
turn fans or other electrical device on or off without good reason in such a situation. Failure to observe this
precaution may result in explosion.
Immediately turn off the ―OPERATION‖ switch and close the main gas valve whenever you notice abnormal
noise, strange smells, black smoke, or any other unusual conditions. Failure to observe this precaution may
result in fire, gas explosion, and other dangerous situations.
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.
Listen to the blower, feed water pump, and other devices
and confirm that no abnormal operating noise is being
generated.
Should be
emitting a
smooth
operating hum
sound.
Confirm that the readings on the steam pressure gauge
and the gas pressure gauge are within the normal ranges,
and the gauge pointers are not swinging wildly.
Gas
Confirm that there is no gas leaking from the piping.
Gas
50
Boiler Shutdown
1)
Turn off the ―OPERATION‖ switch.
Confirm that the Status lamp turns off.
2)
Apply the method described in Section 6.4:
Operating the Main Steam Valve and close the
valve.
Close
Main steam valve
3)
Close the main feed water valve and the main gas valve.
Close
Main feed water valve
NOTE
If there is any concern regarding freezing of the boiler,
implement the protective measures described in Section 9.1:
Preparing for Possible Freezing.
Refer to Section 9.2: Maintenance during Extended Inactivity
if the boiler will not be used for an extended period of time.
51
Close
Main gas valve
9
INSPECTION & MAINTENANCE
9.1 Preparing for Possible Freezing .............................................. 53
9.1.1 Bleeding Water to Protect against Freezing ................. 53
9.2 Maintenance during Extended Inactivity.................................. 54
9.3 Regular Maintenance Tasks and Timing ................................. 55
9.4 Spare Parts .............................................................................. 57
9.5 Overview of Inspection ............................................................ 58
9.5.1 Checking the Chemical Feeder ..................................... 58
9.5.2 Checking the Water Softness........................................ 59
9.5.3 Checking the Gas Pressure .......................................... 60
9.5.4 Checking the Steam Pressure ...................................... 60
9.5.5 Blowdown & Testing of
the Low Water Level Interlock ....................................... 61
9.5.6 Cleaning the Air Filter .................................................... 63
9.5.7 Cleaning the Feed-water Strainer ................................. 64
9.5.8 Cleaning the Feed-water Tank ...................................... 66
9.5.9 Checking the Water Quality .......................................... 68
9.5.10 Inspecting the Safety Valve ......................................... 69
9.5.11 Cleaning the UV Sensor’s Protective Glass ................ 69
52
Preparing for Possible Freezing
NOTE
The following describes one specific set of measures to protect against freezing. Ensure that the
measures implement for both boiler and ancillary equipment are suitable for the local region and boiler
installation.
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
1)
Shut down the boiler as described in Section 8.3: Boiler
Shutdown.
2)
Stand by until the pressure reading on the steam pressure
gauge reaches 30 PSI.
3)
Slowly open the boiler blowdown valve and carry out boilerwater blowdown.
Steam pressure gauge
WARNING
All parts of the boiler will be extremely hot at this time.
Touch only those parts clearly identified in the instructions.
Failure to observe this precaution can result in burns and other
injuries.
Do not open the boiler blowdown valve rapidly.
Anything other than slow opening of this valve will result in the
violent discharge of steam, which could cause burns and other
injuries.
4)
Stand by until the pressure reading on the steam pressure
gauge reaches 0 PSI.
5)
Slowly open the boiler’s air bleed valve.
Open slowly
Boiler blowdown valve
WARNING
Steam pressure gauge
Steam may be discharged from the boiler’s air bleed valve.
For reasons of safety, therefore, ensure that no work is being
done in the direction of discharge.
Failure to follow this precaution can result in burns and other
injuries.
6)
Open the water sampling valve and confirm no water is
discharged.
7)
Close the boiler blowdown valve, the boiler air-bleed valve,
and the water sampling valve.
Open slowly
Boiler air-bleed valve
Close
Close
Boiler blowdown valve
53
Boiler air-bleed valve
 Bleeding Water from the Feed-Water Pump
WARNING
Piping near the feed water pump is extremely hot. For this reason, you should wait until it has sufficiently
cooled down (at least two hours after boiler shutdown) before performing this work. Failure to observe this
precaution can result in burns and other injuries.
1)
Close the feed-water stop valve and the main feedwater valve.
2)
Open the feed water pump’s water bleed valve and
air bleed valve.
Discharge water contained in the feed water pump
via the water bleed valve.
Close
Feed-water
stop valve
Close
Main feed water
valve
NOTE
Do not rotate the handle for both the water bleed
valve and the air bleed valve for more than one
complete turn. Failure to observe this precaution
may result in the gushing out of water.
3)
Stand by until water is no longer discharged from
the water bleed valve.
4)
Close the feed water pump’s water bleed valve and
air bleed valve.
Maintenance during Extended Inactivity
NOTE
A boiler that is inactive for an extended period of time must be properly maintained.
It is often the case that boiler maintenance is neglected once it has become inactive. Failure to
maintain suitable storage conditions for the pressure vessel during extended periods of inactivity can
result in the start and acceleration of corrosion. In order to avoid this outcome, one of two
maintenance methods may be used – namely, wet lay-up (the application of volatile corrosive
inhibitors) or dry lay-up.
To prevent internal corrosion during periods of extended shutdown (5 to 9 days), deoxidizing agent should be
maintained at 150-200 mg/L in the boiler water and the boiler water pH level must be kept between 11-12 to
reduce corrosion
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.
54
Since the EX is a small water content boiler, in places where freezing is a problem, caution should be taken
when storing with water inside the pressure vessel.
Finally, check to make sure all manual valves (water inlet, steam outlet, main & pilot gas,...) are closed tightly
and turn off the main power supply to boiler during shutdown.
Starting the boiler after a long period of shutdown
Drain the water and chemicals in the boiler.
Fill up the boiler with feed water, run the boiler until the boiler pressure reaches 30PSIG, and blow off the
water too remove chemicals in the boiler. Repeat this process once again.
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.
Regular Maintenance Tasks and Timing
WARNING
No work other than that clearly indicated below is to be carried out on the boiler. Failure to observe this
precaution may result in injury.
The inspection and cleaning tasks listed below must be carried out on a regular basis in order to prevent
breakdown and to maintain the high levels of cost effectiveness and safety delivered by your LX steam boiler
over a long service life. (Some of the listed items may not apply to your system. If in doubt, please contact
MIURA maintenance personnel.)
This table presents the standard timing for each inspection and cleaning task, and certain operating
conditions (for example, extremely bad water quality) may dictate inspection and cleaning on a more
frequent basis. It is important to follow the priority given to instructions by MIURA maintenance personnel
regarding the required frequency of maintenance work.
TIMING
INSPECTION OR CLEANING TASK
Daily
As shown
on display
Chemical Feed Check
Page 58

Water Softness Check
Page 59

Gas Pressure Check
Page 60

Steam Pressure Check
Page 60

Low Water Level Interlock Test
Page 61

Blowdown
Page 62

Air Filter Cleaning
Page 63

Feed-water Strainer Cleaning
Page 64
Once every
four months


55
Yearly
Feed-water Tank Interior Cleaning
Page 66

Water Quality Check
Page 68

Safety Valve Inspection
Page 69

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
Seasonal (i.e., the motor or blower is idle for more than six
months)
Annually
Intermittently (i.e., normal daily operation of the boiler)
Semi-annually
Continuous
Quarterly
Do not over-grease the bearings. Over-greasing will cause bearing heat to increase and can result in
bearing and motor failure. Always follow the instructions given on the motor nameplate.
56
Spare Parts
It is not necessary to order replacement parts from MIURA when the parts warranty has expired. One of our
design advantages is the use of non-proprietary parts. The electrical controlled components and assorted
valves may be purchased from any industrial parts supplier.
The list below is not all-inclusive, but in general, is more than required. For the customer who does not have
a standby boiler and far away from a service representative, or desires to maintain a more comprehensive
selection of spare parts, contact MIURA for a customized list.
The cost of standard ground shipment of a warranty replacement part is paid by MIURA, but for express
shipping, the customer will be charged for the extra cost. In addition, the shipment cost for the return of a
defective part to MIURA is also paid by the customer. If a warranty-replacement defective part is not returned
to MIURA, the customer will be invoiced for the replacement. Furthermore, if the defective part failure is
determined to be not a manufacturing defect, the customer will be invoiced by MIURA.
PART NAME
Damper coupling
rubber assembly
Relay
PART NUMBER
Lovejoy 5/8" × 7/16"
L070
LY-2, CSA, 120V
CA7-85-19-120
CA7-72-11-120
Magnetic contactor
CA7-60-11-120
for blower.
CA7-43-11-120
Manufactured by
Sprecher
1
1
1
1
1
1
1
1
1
1
1
1
1
208 V
230 V
1
208 V
230 V
208V
208 V
230 V
208 V
230 V
208 V
230 V
460 V
575 V
460 V
575 V
CA7-37-10-120
CA7-30-10-120
One of each,
depending on boiler CA7-16-10-120
model and voltage
CA7-12-10-120
CA7-60-10-120
CA7-43-10-120
Magnetic contactor CA7-37-10-120
for water pump
CA7-30-10-120
Manufactured by
Sprecher
CA7-23-10-120
One of each
depending on boiler CA7-16-10-120
model and voltage
CA7-12-10-120
Spark rod
Level sensor *
LX-50 LX-100 LX-150 LX-200 LXH-200 LX-300 LXH-300
SR100300
Warrick 3H1C
LX-300 985201
LX 985167 (Seal:
Feed pump seal
96455086 & gasket:
repair kit
96455090)
CR2/4/8 (CR1/3/5) LXL 985167 (Seal:
96455086 & gasket:
96455090)
Thermocouple
Type K ungrounded
CF 100000
Compression Fitting
(for thermocouple)
Burner element
FB 100200 (not pre-cut)
packing
(issue quantity is sq. ft.)
230 V
460 V
575 V
208 V
230 V
460 V
575 V
460 V
575 V
460 V
575 V
460 V
575 V
208 V
230 V
208 V
230 V
208 V
230 V
208 V
230 V
460 V
575 V
1
1
208 V
230 V
208 V
230 V
460 V
575 V
1
1
460 V
575 V
1
1
460 V
575 V
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
57
208 V
230 V
208 V
460 V
575 V
460 V
460 V
575 V
575 V
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
3
3
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. You should also ensure the
chemical feeder’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.
1)
Confirm that the chemical feed is as required.
2)
Confirm that sufficient liquid is present to properly dissolve chemicals.
3)
Confirm that there is no air in the chemical feed pump or feed line.
WARNING
Protective glasses and rubber gloves must be worn when adding chemical compounds. These compounds
may cause sight loss, burns, and other injuries when they contact with skin or eyes.
If boiler chemical comes into direct contact with skin, immediately wash away using cold water.
If this chemical enters an eye, immediately wash away with cold water and seek medical attention.
NOTE
Always follow the instructions of your water treatment personnel in terms of chemical dosage.
Insufficient replenishment of chemical compounds can lead to air entering the chemical feed pump and the
interruption of supply to the boiler. Accordingly, chemical level checks must be carried out in a proper
manner.
If the level of chemical in the chemical tank does not reduce at the expected rate, it could indicate that air
has become trapped in the pump. In such a case, bleed air from the chemical feed pump.
58
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.
1)
To prepare for sampling, rapidly discharge
approximately two liters of water from the water
sampling port.
2)
Thoroughly wash the sampling beaker with the
sample water.
3)
Add four drops of hardness indicator to the
sampling beaker.
4)
Add approximately 20 mL of sample water and
agitate well to mix.
Water sampling port
Hardness indicator
5)
After agitating, fill the sampling beaker up to the
50-mL level by collecting more sample water.
6)
Determine the water hardness based on the color
of the solution in the sampling beaker.
Light or dark blue : Water is sufficiently soft
Purple or red
: Water has not been sufficiently softened.
CAUTION
Do not use a finger to mix the water in the sampling beaker. This type of mixing is not sufficient for hardness
measurement.
It order to reliably determine the water hardness, it is crucial that only four drops of hardness indicator be
added, and 50 mL of sample water.
When adding drops of hardness indicator, do it slowly with the bottle held vertically.
After agitating well, add more sampled water to increase the overall volume in the sampling beaker to 50 mL,
and then immediately check the color of the solution. The color will change after approximately 10 minutes,
so any judgment after 10 minutes will be unreliable.
59
9.5.3
Checking the Gas Pressure
1)
Open the main gas valve.
2)
Using the boiler’s gas pressure gauge, confirm
whether the gas is pressurized to the required
range (i.e., 3 to 5 PSI).
3)
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.
Main gas valve
Open
Gas pressure gauge
9.5.4
1)
Checking the Steam Pressure
Startup the boiler as described in Section 8.1:
Boiler Startup.
Steam pressure gauge
2)
Confirm that the reading on the steam pressure
gauge is in the normal range, and that the gauge
pointer is not swinging wildly.
WARNING
If the steam pressure is not within the normal range,
immediately shutdown the boiler and contact a MIURA
sales office or your local dealer for further instruction.
Continued use of the boiler with abnormal steam
pressure levels may result in boiler damage, which in turn
could lead to injury.
60
9.5.5
Blowdown & Testing of the Low Water Level Interlock
WARNING
Do not start blowdown until you have first confirmed that the boiler has been shutdown. Failure to observe
this precaution can result in burns and other injuries.
(There is no need to carry out blowdown immediately after the display presents a blowdown request during
normal boiler operation. It is recommended to wait until the next startup on the following operating day.)
NOTE
The system will inform you that regular blowdown is required by lighting the Status lamp in yellow and
outputting the message ―BOILER CHECK1‖ on the display. (The display’s ―B‖ indicator will also flash at this
time.)
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.
 Blowdown Procedure
1)
Carry out steps 1 to 3 of the boiler startup procedure described
in Section 8.1: Boiler Startup.
2)
Confirm that the steam pressure gauge is reading 30 PSI.
3)
Turn off the ―OPERATION‖ switch.
Confirm that the Status lamp turns off.
(The main steam valve should also be closed at this time.)
Steam pressure gauge
WARNING
Blowdown must not be carried out if the pressure reading on the steam
pressure gauge is above 30 PSI. If this precaution were to be ignored,
steam and hot water could be violently discharged from the boiler, which in
turn could cause burns and other injuries.
(The steam pressure can be lowered by temporarily opening the main
steam valve.)
4)
Slowly open the boiler’s blowdown valve and carry out boiler-water
blowdown.
Boiler blowdown valve
WARNING
All parts of the boiler will be extremely hot at this time.
In order to avoid burns and other injuries, avoid touching any part of the
boiler other than the blowdown valve.
Do not open the boiler blowdown valve rapidly.
If the valve is not opened slowly, violent discharge of steam, will cause
burns and other injuries.
Open slowly
61
WARNING
Confirm that the blowdown piping has been firmly
secured in place in order to prevent it moving in reaction
to the blowdown discharge.
Confirm that the outlet of the blowdown piping is fully
open and in a safe location, such as inside a pit.
5)
Confirm that the display’s ―B‖ indicator turns off.
6)
Close the boiler blowdown valve.
7)
Turn on the ―OPERATION‖ switch.
8)
Confirm that the Status lamp lights in red.
If the Status lamp flashes in green at this time, it
will indicate that a water level probe error has
occurred.
In such a case, refer to Section 10.3.2: Inspecting
Water Level Probes.
DISABLE
STEAM
0PSI
Boiler blowdown valve
Close
Once the normal water level has been reached, the
Status lamp will switch from red to green, and after
a short while, combustion will begin.
9)
Normal operation procedures (i.e., from step 3 of
the startup sequence detailed in Section 8.1: Boiler
Startup) apply from this point onward.
 Low Water Level Interlock Test
If the water volume, for any reason, falls below the pre-determined water volume, combustion will
immediately be stopped and if it is not recovered after 15 sec after combustion shutoff, a warning alarm will
be activated. The display will read, ―WATER ALARM 1‖.
For testing the Low Water Volume Cut-off, open the ball valve at the bottom of the LVC and allow time for the
steam pressure to force the water out of the LVC. When the low water cut-off probe loses contact with the
water for more than 15 seconds, the boiler will shift to stand-by mode first and shut down 15 seconds, the
alarm will sound and the BL11 Microcomputer will display ―WATER ALARM 1‖.
62
9.5.6
Cleaning the Air Filter
NOTE
If dust or other foreign matter has caused the air filter to become clogged, the control system will inform
you by lighting the Status lamp in yellow and presenting the message ―BOILER CHECK3‖ on the display.
Incomplete combustion could occur if this situation is not addressed, therefore, it is important that the air
filter is cleaned whenever blockage has occurred.
We recommend that the filter also be cleaned on a regular basis in order to ensure clean, safe operation
of this steam boiler.
Extra care must be taken regarding to the cleaning of filters in cement factories, textile plants, and other
locations where a large amount of airborne material is present inside the boiler room.
WARNING
Before attempting to clean the air filter, be sure to always
receive instruction from MIURA maintenance personnel and
to fully familiarize yourself with the process involved.
1)
Turn off the breaker for the boiler’s main power.
WARNING
Allow sufficient time for the boiler to cool down before
performing this task.
As all parts of the boiler remain at a high temperature for
some time after shutdown, failure to observe this precaution
can result in burns and other injuries.
The main-power breaker must be turned off in advance of
this procedure.
If the blower were to operate, injury such as the loss of
fingers could easily occur.
Never operate the breaker for the boiler’s main power supply
with wet hands. Failure to observe this precaution may lead
to electric shock and have other undesirable consequences.
2)
Main power
Setup a ladder and climb onto the top of the boiler.
WARNING
Do not jump onto or jump off the ladder. You must keep
both hands and one foot, or both feet and one hand in
contact with the ladder at all times when ascending or
descending. Failure to observe this precaution may result
in a fall and the associated injury.
Use only the indicated footing.
Failure to observe this precaution may result in a fall from
the boiler or damage to the boiler itself.
3)
Clean the filter using a soft brush.
4)
If the filter is damaged or extremely dirty, it must be
replaced. In such a case, please contact MIURA
maintenance personnel.
63
Brush
Filter
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. Failure to observe this precaution can result in
burns and other injuries.
1)
Turn off the breaker for the boiler’s main power.
Confirm that the steam pressure gauge is reading
0 PSI. If this is not the case, stand by until the
pressure reading drops to zero.
WARNING
Main power
Never operate the breaker for the boiler’s main power
supply with wet hands. Failure to observe this precaution
may lead to electric shock and have other undesirable
consequences.
2)
Confirm that the main feed water valve is closed.
3)
Open the boiler blowdown valve and carry out
boiler-water blowdown.
Steam pressure gauge
Close
Close
Main feed water
valve
Main feed water
valve
WARNING
Main feed water
valve
Be sure to always carry out boiler-water blowdown before
cleaning the feed water strainer. If reverse flow of boiler
water were to occur during this procedure, it could result
in burns or other injury.
4)
Open
When the discharge of boiler water has stopped,
close the boiler blowdown valve.
5)
Open the feed water pump’s air bleed valve.
This action releases pressure from the feed water
piping.
6)
Using wrenches, open the feed water strainer’s
cap.
Boiler blowdown valve
Main feed water
valve
Close
NOTE
Water will discharge from the piping when you open
the feed water strainer’s cap. Particularly in cases
where the piping is long, a relatively large amount of
water may come out, and buckets or containers
should be used to prevent spillage.
Feed water strainer
Wrenches
Cap
64
7)
Remove the filter and clean it using a brush.
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
8)
Return the filter to its original position inside the
feed water strainer.
Cap
9)
Wrap PTFE tape around the cap’s contact surface,
and then secure the cap tightly using wrenches.
NOTE
Be sure to wrap the PTFE tape neatly and in the
opposite direction to that of cap tightening. Failure to
observe this precaution can result in the leakage of
water.
Cap
PTFE tape
10)
Close the feed water pump’s air bleed valve.
When the feed water strainer has been cleaned, it
is important to bleed air from the feed water pump
as described in Section 10.3.1: Bleeding Air from
the Feed Water Pump before operating the boiler.
65
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. Failure to observe this precaution can result in burns and other injuries.
Main makeup valve
Feed water tank
Feed water tank’s
blowdown valve
 Cleaning the Feed-water Tank
1)
Turn off the breaker for the boiler’s main power.
Confirm that the steam pressure gauge is reading
0 PSI. If this is not the case, stand by until the
pressure reading drops to zero.
Main power
WARNING
Steam pressure gauge
Never operate the breaker for the boiler’s main power
supply with wet hands. Failure to observe this precaution
may lead to electric shock and have other undesirable
consequences.
2)
Close the main makeup valve.
Main makeup valve
Close
3)
Open the blowdown valve for the feed water tank.
Open
Feed water tank’s
blowdown valve
66
4)
When the discharge of water ends, close the feed
water tank’s blowdown valve.
5)
Open the main makeup valve.
Close
Feed water tank’s
blowdown valve
Main makeup valve
Open
67
9.5.9
Checking the Water Quality
NOTE
You must check the water quality once every four months. The quality of tap water, underground water,
industrial supply water, and other sources typically change from season to season.
Failure to carry out regular quality checks could lead to drop in boiler efficiency and boiler water tube
damages.
Please contact a MIURA sales office or your local dealer for assistance regarding water quality
checking.
ITEM
UNITS
pH (at 25C)
BOILER WATER
MAKE UP WATER
(FEED WATER)
11.0 - 11.8
7-9
-0.0-
-0.0-
Hardness
mg/L CaCO3
Oxygen
PPM O2
P Alkalinity
mg/L CaCO3
150 - 600
M Alkalinity
mg/L CaCO3
250 - 800
Below 0.5 PPM or
above 90C
-
Sulfites
PPM S
Conductivity (at 25C)
S/cm
Detectable
Detectable
1,500 - 4,000
-
Chloride
mg/L Cl
Below 400
Below 30
Silica
mg/L SiO2
Below 250
Below 30
Iron and Manganese
mg/L Fe + Mn
Below 1.0
Total below 0.5
NOTE
One of the most common causes of boiler damage is scale. Water hardness must be tested daily. The
conventional method of testing water hardness is through manual testing.
Results can vary due to sample and reagent amounts, personal interpretation, and lack of continuity in
monitoring hardness. An optional MIURA Colormetry CMU solves all of these problems by offering an
automatic monitoring system for sample water collection, chemical reagent injection, mixing and
evaluation. With this option, MIURA boiler will also display the message ―CAUTION – CHECK
SOFTENER‖ whenever the MIURA Colormetry CMU detects hardness.
68
9.5.10 Inspecting the Safety Valve
WARNING
The safety valve must be inspected on a regular basis. Failure to do so can result in valve damage, which
in turn can lead to boiler explosion and have other undesirable consequences.
NOTE
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.
Please arrange for MIURA maintenance personnel to carry out safety-valve inspection.
9.5.11 Cleaning the UV Sensor’s Protective Glass
WARNING
Main power
As all parts of the boiler remain at a high temperature for some time after
shutdown, you should allow sufficient time for cooling down before performing
this work. Failure to observe this precaution can result in burns and other injury.
Before attempting to clean the UV sensor’s protective glass, be sure to always
receive instruction from MIURA maintenance personnel and to fully familiarize
yourself with the process involved.
UV sensor
1)
Turn off the breaker for the boiler’s main power.
WARNING
Never operate the breaker for the boiler’s main power
supply with wet hands. Failure to observe this precaution
may lead to electric shock and have other undesirable
consequences.
Screws
2)
Extract the UV sensor.
3)
Remove the mounting screws from the phototube base.
4)
Using a soft cloth, wipe all soot from the glass at
the bottom of the UV sensor’s base.
5)
Reassemble and replace the sensor in its original
condition and position.
UV sensor base
Glass
69
Packing
10
BREAKDOWN & COUNTERMEASURES
10.1 Alarm and Red Status Lamp – Alarm .................................... 71
10.2 Yellow Status Lamp – Caution .............................................. 72
10.3 Action to be Taken before Ordering Repairs ......................... 73
10.3.1 Bleeding Air from the Feed Water Pump .................... 76
10.3.2 Inspecting Water Level Probes ................................... 77
10.3.3 Resetting the High Pressure Limit Shutoff Switch ...... 77
10.3.4 Resetting Blower Overcurrent ..................................... 78
70
10.5 Alarm and Red Status Lamp – Alarm
NOTE
A ―alarm‖ is activated when the control system determines that dextended operation of the
boiler would constitute a safety hazard and potential boiler damage. In such a case, the
system stops combustion and provides notification in the form of an audible alarm and
display message.
Combustion is automatically stopped when an alarm is triggered.
At this time, the control system sounds an alarm and
lights the Status lamp in red.
In addition, details of the alarm are shown on the display.
1)
Press the ―DATA‖ button to stop the alarm.
NOTE
In the case of certain alarms, 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 an
alarm.
2)
Take note of the alarm details, and then turn off the
―OPERATION‖ switch.
This action will clear the alarm display.
NOTE
In certain cases, the alarm will not stop in
response to steps (1) and (2) above. In such a
case, turn off the breaker for the boiler’s main
power, and then contact a MIURA sales office
for further instruction.
3)
Eliminate the cause of the alarm as described in
Section 10.3: Action to be Taken before Ordering
Repairs.
WARNING
Procedures aimed at removing the cause of an alarm must
be carried out in strict accordance with the given instructions.
Failure to do so may have serious consequences.
4)
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.
71
10.6 Yellow Status Lamp – Caution
NOTE
A ―caution‖ is issued upon the occurrence of a situation that could result in the
activation of an alarm if left unaddressed.
If the control system identifies a condition that could lead to the activation of an alarm during subsequent
operation, combustion is allowed to continue as is, or the control method is changed automatically in order to
facilitate ongoing operation.
At this time, the system lights the Status lamp in yellow.
No alarm is sounded upon the issuance of a 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.
The display of caution details can be reset by
pressing the ―DATA‖ button, even during operation
of the boiler.
1)
Carry out steps (1) and (2) from Section 10.1: Alarm and
Red Status Lamp – Alarm.
2)
Eliminate the cause of the alarm as described in Section
10.3: Action to be Taken before Ordering Repairs.
WARNING
Procedures aimed at removing the cause of an alarm must be
carried out in strict accordance with the given instructions. Failure
to do so may have serious consequences.
72
10.7 Action to be Taken before Ordering Repairs
WARNING
Whenever taking action in response to an alarm or a caution, be sure to always turn off the boiler’s
―OPERATION‖ switch, and follow the action in the table below, to carry out the required work in strict
accordance with the corresponding instructions.
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.
No work other than that indicated below is to be carried out. Failure to observe this precaution may result in
injury.
SYMPTOMS OR DISPLAY CONTENT
CAUSE
No power is being supplied to the boiler.
Display does not turn on
BURNER ALARM 2
The breaker for the boiler’s main power is
turned off.
Problem with the volume of air required for
combustion.
REQUIRED ACTION
Confirm whether a power failure has
occurred.
Turn on the breaker for the boiler’s main
power.
Inspect the air pressure switch.
Turn the ―OPERATION‖ switch off and
then back on. (This action will clear the
alarm display.)
If the same alarm occurs again,
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
-
-
-
BURNER ALARM 4
Overcurrent has occurred in the blower.
WATER ALARM 2
Overcurrent has occurred in the feed water
pump.
BURNER ALARM 5
Either the main gas valve is closed or a
problem has occurred in the UV sensor.
Either the main gas valve is closed or there is
a problem with the volume of air required for
combustion.
Open the main gas valve.
-
A problem has occurred with the air damper.
Inspect the damper.
-
Open the main feed-water valve.
-
Close the blowdown valve.
-
Bleed air from the feed water pump.
76
Clean the feed water strainer.
64
Inspect the water system upstream of
the feed water equipment.
66
Inspect the probe.
77
BURNER ALARM 7
78
76
BURNER ALARM 13
Red Status Lamp
BURNER ALARM14
WATER ALARM 1
The main feed water valve is closed and no
water is being delivered.
The blowdown valve is open and water is
being discharged from the boiler.
Air has become trapped in the feed water
pump, preventing it from operating correctly.
The feed water strainer is blocked and no
water is being delivered.
A problem may have occurred upstream of
the feed water equipment.
WATER ALARM 6
WATER ALARM 8
WATER ALARM 10
WATER ALARM 11
Poor electrical contact with the water level
probe.
WATER ALARM 12
WATER ALARM 13
WATER ALARM 17
73
SYMPTOMS OR DISPLAY
CONTENT
CAUSE
REQUIRED ACTION
PAGE
WATER ALARM 3
WATER ALARM 7
WATER ALARM 14
WATER ALARM 15
There is poor continuity in the water
level probe.
Inspect the probe.
77
WATER ALARM 16
WATER ALARM 18
CONTROL ALARM 1
CONTROL ALARM 2
A problem has occurred with the
control system.
-
CONTROL ALARM 3
SAFETY STOP 1
SAFETY STOP 2
SAFETY STOP 4
SAFETY STOP 5
Red Status Lamp
SAFETY STOP 6
SAFETY STOP 7
SAFETY STOP 8
A problem has occurred with the
combustion control system.
A problem has occurred with the fuel
supply equipment.
A problem has occurred with the UV
sensor.
The exhaust-gas temperature is not
within the normal range.
A safety device was activated.
A high steam-pressure cutout was
activated.
A wire has broken for the overheat
thermocouple.
Turn the ―OPERATION‖ switch
off and then back on. (This
action will clear the alarm
display.)
If the same alarm occurs again,
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.
-
-
-
-
-
77
-
SAFETY STOP 11
Abnormal combustion is occurring.
-
SAFETY STOP 44
A wire has broken for the scale monitor.
-
SAFETY STOP 45
SAFETY STOP 46
SAFETY STOP 47
A problem has occurred with the water
softener.
The regulator has malfunctioned or a
wire has broken for the pressure
switch.
The chimney damper has
malfunctioned.
SAFETY STOP 48
The gas valve has malfunctioned.
SAFETY STOP 49
The chimney is blocked.
SENSOR ALARM 1
A problem has occurred with the air
pressure switch.
UTILITY ALARM 1
A power failure has occurred.
UTILITY ALARM 3
An emergency stop device was activated.
UTILITY ALARM 2
UTILITY ALARM 14
Inspect the water softener.
56
-
Turn the ―OPERATION‖ switch
off and then back on. (This
action will clear the alarm
display.)
If the same alarm occurs again,
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.
An earthquake detector was activated,
causing the boiler to shutdown.(not
Reset the earthquake detector.
supplied)
Confirm that sufficient gas
Either the main gas valve is closed or
remains and/or open the main
there is no gas left.
gas valve.
74
-
-
-
-
-
-
-
-
SYMPTOMS OR DISPLAY
CONTENT
CAUSE
WATER CHECK 1
The strainer is blocked or the blowdown valve
is open.
WATER CHECK 2
The check valve is damaged.
WATER CHECK 4
WATER CHECK 5
WATER CHECK 7
WATER CHECK 8
There is poor insulation in the water level
probe.
There is poor continuity in the water level
probe.
Either the surface-blowdown strainer has
become blocked or the solenoid valve has
malfunctioned.
A wire has broken in the conductivity sensor.
The level of voltage in the backup battery has
dropped.
A problem has occurred with the feed-water
temperature sensor.
A problem has occurred with the scale
monitor.
A problem has occurred with the overheat
thermocouple.
A problem has occurred with the exhaust-gas
temperature sensor.
A problem has occurred with the exhaust-gas
temperature sensor.
A problem has occurred with the steam
pressure sensor.
A problem has occurred with the UV sensor.
SECURITY CHECK 2
SECURITY CHECK 3
SECURITY CHECK 4
SENSOR CHECK 1
SENSOR CHECK 3
SENSOR CHECK 4
Yellow Status Lamp
SENSOR CHECK 5
SENSOR CHECK 6
SENSOR CHECK 8
SENSOR CHECK 11
DATA COM CHECK 1
DATA COM CHECK 2
REQUIRED ACTION
A communication problem has occurred.
Clean the strainer and/or close
the blowdown valve.
Contact a MIURA sales office or
your local dealer for assistance.
PAGE
64
-
Inspect the probe.
77
Clean the strainer.
-
Inspect the conductivity sensor.
-
Replace the battery.
-
-
The boiler’s control system has
identified a condition that could
lead to the occurrence of an
alarm during subsequent
operation.
Although operation of the boiler
may be continued, you should
contact a MIURA sales office or
your local dealer for assistance.
-
-
-
-
-
69
Immediately contact a MIURA
sales office or your local dealer
for assistance.
Carry out measures to protect
against freezing.
Turn on fans and other ventilation
equipment.
-
UTILITY CHECK 1
There is a danger of freezing.
UTILITY CHECK 3
Ventilation is not sufficient.
BOILER CHECK 1
BOILER CHECK 2
The scheduled time for blowdown has been
reached.
Perform blowdown.
61
BOILER CHECK 3
The air filter is blocked.
Clean the air filter.
63
Inspect the water softener.
59
Add chemical.
58
Immediately contact a MIURA
sales office or your local dealer
for assistance.
-
MISC CHECK 1
MISC CHECK 2
DATA COM ERROR1
DATA COM ERROR2
DATA COM ERROR3
DATA COM ERROR4
DATA COM ERROR6
DATA COM ERROR7
DATA COM ERROR8
DATA COM ERROR10
DATA COM ERROR11
A problem has occurred with the water
softener.
There is insufficient chemical in the system.
A communication problem has occurred.
75
53
-
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. Failure to observe this precaution can result in burns and other
injuries.
1)
Carry out steps (1) to (3) from Section 10.1: Alarm
and Red Status Lamp – Alarm.
2)
Open the main feed-water valve.
3)
Open the feed water pump’s air bleed valve.
A mixture of air and water will be discharged from
the air bleed valve. Air bleeding will be completed
when air is no longer contained in the discharged
water.
Open
NOTE
Ensure that you rotate the handle for the air
bleed valve by no more than one complete turn.
Failure to observe this precaution may result in
the rushing out of water.
4)
Confirm that all air has been bled from the system
and that only water is being discharged.
5)
Close the feed water pump’s air bleed valve.
76
Main feed water valve
Main feed water valve
Main feed water valve
Main feed water valve
10.3.2 Inspecting Water Level Probes
1)
Carry out steps (1) and (2) from Section 10.1:
Alarm and Red Status Lamp – Alarm.
WARNING
Allow sufficient time for the boiler to cool down (at least
two hours after boiler shutdown) before performing this
task.
As all parts of the boiler remain at a high temperature for
some time after shutdown, failure to observe this
precaution can result in burns and other injuries.
Rubber electrode cap
Water level probe
2)
Remove the rubber electrode cap from the top of
the electrode, and reconnect the terminal.
Following this, return the rubber electrode cap to
its original position.
3)
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
1)
Carry out steps (1) and (2) from Section 10.1:
Alarm and Red Status Lamp – Alarm.
2)
If the boiler shuts down due to high pressure, you
need to press the reset lever on the pressure
switch to restart the boiler.
3)
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
Please check the pressure transducer and BL11 Microcomputer
settings as well as the control pressure switch for any
malfunction or incorrect setting. The control pressure switch
should have a lower setting than the high pressure limit switch,
and the microcomputer should have a lower setting than both
steam pressure switches.
When testing the high pressure limit switch, set it lower than the
BL11 Microcomputer setting so that it will shut down the boiler
when the set pressure is reached. After testing, be sure to set it
back to the original setting and to reset the high pressure limit
switch.
77
Terminal
10.3.4 Resetting Blower Overcurrent
1)
Carry out steps (1) and (2) from Section 10.1:
Alarm and Red Status Lamp – Alarm.
2)
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. In addition, an alarm
will be activated and the display will show ―BURNER
ALARM 4‖. Some motors have an internal stator-winding
thermal overload feature, in case of tripping because of
these internal overload protection, operation will not
resume until the blower motor has cooled down.
78
11
SPECIFICATIONS
79
Specifications for LX-50
ITEM
UNITS
LX-50 G
LX-50 SG
Boiler Type
Multiple water tube, once through, forced flow, steam boiler
Boiler Horsepower Rating
BHP
50
Maximum Pressure
PSIG (Kg/cm²)
170 (11.95) design
Equivalent Output
Lb/Hr (Kg/Hr)
1,725 (782)
Heat Output
1,674,000 (421,800)
Btu/Hr
(KCal/Hr)
Heat Input
2,092,000 (527,200)
1,969,000 (496,200)
Efficiency (fuel to steam)
%
80
85
Boiler Heating Surface Area
Ft² (m²)
192.4 (17.9)
Operational Weight
Lb (Kg)
3,380 (1,530)
3,710 (1,680)
Shipping Weight
Lb (Kg)
3,150 (1,430)
3,480 (1,580)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
575, 460, 230 or 208V 3 phase, 60 Hz
Max. Electrical Consumption –
KVA
6.5
with or w/o MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
Main Steam Outlet
Safety Valve Outlet
Feedwater Inlet
Fuel Gas Inlet
HP (KW)
SCFH (Nm3/Hr)
PSIG
SCFH (Nm3/Hr)
Ft/s (m/s)
F (C)
Inches
Automatic "Surface" Blowdown
3.0 (2.25)
2,090 (56.1)
1,960 (52.5)
3 - 5 (natural gas or propane)
27,500 (750)
26,300 (706)
23,400 (639)
22,400 (600)
17.3 (5.3)
13.1 (4.0)
450 (230)
270 (130)
2" NPT
1¼" NPT
3
/4" NPT
1½" NPT
3
/8" NPT
Boiler & LVC Drain
2 x 1" NPT
Chimney Diameter
12" ID
Flame Detector
Ultraviolet flame eye sensor
Overheat Protection
High tube temperature & Low water cut-off.
NOTE:
i. Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C)
steam.
ii.
iii.
iv.
v.
Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
Thermal efficiencies are based on high heating values of fuels.
Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Boiler Safety valve Outlet size may increase if set below 170 PSIG.
Page 80
Specifications for LXL-50
ITEM
Boiler Type
Boiler Horsepower Rating
UNITS
LXL-50 G
LXL-50 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
50
Maximum Pressure
PSIG (Kg/cm²)
15 (1.05) design
Equivalent Output
Lb/Hr (Kg/Hr)
1,725 (782)
Btu/Hr
(KCal/Hr)
1,674,000 (421,800)
2,092,000 (527,200)
1,969,000 (496,200)
%
80
85
Heat Output
Heat Input
Efficiency (fuel to steam)
Boiler Heating Surface Area
Ft² (m²)
192.4 (17.9)
Operational Weight
Lb (Kg)
4,040 (1,830)
4,370 (1,980)
Shipping Weight
Lb (Kg)
3,690 (1,670)
4,020 (1,820)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
Max. Electrical Consumption
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
575, 460, 230 or 208V, 3 phase, 60 Hz
KVA
5.0 with MI Check Valve option
HP (KW)
4.9 without MI Check valve option
3.0 (2.25)
SCFH (Nm3/Hr)
PSIG
2,090 (56.1)
1,960 (52.5)
3 - 5 (natural gas or propane)
27,500 (750)
26,300 (706)
23,400 (639)
22,400 (600)
Ft/s (m/s)
17.3 (5.3)
13.1 (4.0)
F (C)
450 (230)
270 (130)
SCFH (Nm3/Hr)
Main Steam Outlet
4" FLG
Safety Valve Outlet
2½" NPT
3
Feedwater Inlet
Fuel Gas Inlet
/4" NPT
Inches
1½" NPT
3
Automatic "Surface" Blowdown
/8" NPT
Boiler & LVC Drain
2 x 1" NPT
Chimney Diameter
12" ID
Flame Detector
Overheat Protection
Ultraviolet flame eye sensor
High tube temperature & Low water cut-off.
NOTE:
i.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
ii. Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
iii. Thermal efficiencies are based on high heating values of fuels.
iv. Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Page 81
Specifications for LX-100
ITEM
UNITS
LX-100 G
LX-100 SG
Boiler Type
Multiple water tube, once through, forced flow, steam boiler
Boiler Horsepower Rating
BHP
100
Maximum Pressure
PSIG (Kg/cm²)
170 (11.95) design
Equivalent Output
Lb/Hr (Kg/Hr)
3,450 (1,565)
Heat Output
3,348,000 (843,600)
Btu/Hr
(KCal/Hr)
Heat Input
4,184,000 (1,054,000) 3,938,000 (992,400)
Efficiency (fuel to steam)
%
80
85
Boiler Heating Surface Area
Ft² (m²)
269.0 (25.0)
Operational Weight
Lb (Kg)
5,590 (2,540)
6,070 (2,750)
Shipping Weight
Lb (Kg)
4,990 (2,260)
5,470 (2,480)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
575, 460, 230 or 208V, 3 phase, 60 Hz
Max. Electrical Consumption –
KVA
13.3
with or w/o MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
Main Steam Outlet
Safety Valve Outlet
Feedwater Inlet
Fuel Gas Inlet
Automatic "Surface" Blowdown
Boiler & LVC Drain
Chimney Diameter
Flame Detector
Overheat Protection
NOTE:
HP (KW)
SCFH (Nm3/Hr)
PSIG
10 (7.5)
4,180 (112.1)
3,920 (105.5)
3 - 5 (natural gas or propane)
55,000 (1,500)
52,500 (1,407)
SCFH (Nm3/Hr)
46,800 (1,279)
44,900 (1,203)
Ft/s (m/s)
34.7 (10.6)
26.0 (7.9)
450 (230)
270 (130)
F (C)
2" NPT
2" NPT
1" NPT
2" NPT
Inches
3
/8" NPT
2 x 1" NPT
12" ID
Ultraviolet flame eye sensor
High tube temperature & Low water cut-off.
i.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
ii.
iii.
iv.
v.
Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
Thermal efficiencies are based on high heating values of fuels.
Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Boiler Safety valve Outlet size may increase if set below 170 PSIG.
Page 82
Specifications for LXL-100
ITEM
Boiler Type
Boiler Horsepower Rating
UNITS
LXL-100 G
LXL-100 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
100
Maximum Pressure
PSIG (Kg/cm²)
15 (1.05) design
Equivalent Output
Lb/Hr (Kg/Hr)
3,450 (1,565)
Btu/Hr
(KCal/Hr)
3,348,000 (843,600)
4,184,000 (1,054,000)
3,938,000 (992,400)
%
80
85
Heat Output
Heat Input
Efficiency (fuel to steam)
Boiler Heating Surface Area
Ft² (m²)
269.0 (25.0)
Operational Weight
Lb (Kg)
6,950 (3,150)
7,430 (3,370)
Shipping Weight
Lb (Kg)
6,050 (2,740)
6,530 (2,960)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
Max. Electrical Consumption
575, 460, 230 or 208V, 3 phase, 60 Hz
10.9 with MI Check Valve option
KVA
10.6 without MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
HP (KW)
3
SCFH (Nm /Hr)
PSIG
10 (7.5)
4,180 (112.1)
3,920 (105.5)
3 - 5 (natural gas or propane)
55,000 (1,500)
52,500 (1,407)
46,800 (1,279)
44,900 (1,203)
Ft/s (m/s)
34.7 (10.6)
26.0 (7.9)
F (C)
450 (230)
270 (130)
SCFH (Nm3/Hr)
Main Steam Outlet
6" FLG
Safety Valve Outlet
2 x 2½" NPT
Feedwater Inlet
Fuel Gas Inlet
1" NPT
Inches
2" NPT
3
Automatic "Surface" Blowdown
/8" NPT
Boiler & LVC Drain
2 x 1" NPT
Chimney Diameter
12" ID
Flame Detector
Overheat Protection
Ultraviolet flame eye sensor
High tube temperature & Low water cut-off.
NOTE:
i.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
ii. Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
iii. Thermal efficiencies are based on high heating values of fuels.
iv. Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Page 83
Specifications for LX-150
ITEM
Boiler Type
Boiler Horsepower Rating
Maximum Pressure
Equivalent Output
Heat Output
Heat Input
Efficiency (fuel to steam)
Boiler Heating Surface Area
Operational Weight
Shipping Weight
Combustion Control
Combustion System
Ignition System
Power Supply
Max. Electrical Consumption
– with or w/o MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
Main Steam Outlet
Safety Valve Outlet
Feedwater Inlet
Fuel Gas Inlet
Automatic "Surface" Blowdown
Boiler & LVC Drain
Chimney Diameter
Flame Detector
Overheat Protection
NOTE:
UNITS
LX-150 G
LX-150 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
150
PSIG (Kg/cm²)
170 (11.95) design
Lb/Hr (Kg/Hr)
5,175 (2,347)
5,022,000 (1,265,000)
Btu/Hr
(KCal/Hr)
6,277,000 (1,582,000) 5,908,000 (1,489,000)
%
80
85
Ft² (m²)
388.2 (36.1)
Lb (Kg)
7,650 (3,470)
8,620 (3,910)
Lb (Kg)
6,850 (3,110)
7,820 (3,550)
3 position step burner HIGH-LOW-OFF
Forced draft, pre-mixed burner
Electric spark ignited interrupted gas pilot
575, 460, 230 or 208V, 3 phase, 60 Hz
KVA
22.1
HP (KW)
SCFH (Nm3/Hr)
PSIG
15 (11.2)
6,250 (167.4)
5,880 (158.3)
3 - 5 (natural gas or propane)
83,700 (2,242)
78,800 (2,111)
SCFH (Nm3/Hr)
71,500 (1,916)
67,300 (1,803)
Ft/s (m/s)
19.1 (5.8)
14.1 (4.3)
470 (240)
270 (130)
F (C)
3" FLG
2½" NPT
1" NPT
2" NPT
Inches
3
/8" NPT
2 x 1" NPT
20" ID
Ultraviolet flame eye sensor
High tube temperature & Low water cut-off.
i.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
ii.
iii.
iv.
v.
Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
Thermal efficiencies are based on high heating values of fuels.
Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Boiler Safety valve Outlet size may increase if set below 170 PSIG.
Page 84
Specifications for LXL-150
ITEM
Boiler Type
Boiler Horsepower Rating
UNITS
LXL-150 G
LXL-150 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
150
Maximum Pressure
PSIG (Kg/cm²)
15 (1.05) design
Equivalent Output
Lb/Hr (Kg/Hr)
5,175 (2,347)
Btu/Hr
(KCal/Hr)
5,022,000 (1,265,000)
Heat Output
Heat Input
Efficiency (fuel to steam)
6,199,000 (1,562,000) 5,908,000 (1,489,000)
%
81
85
Boiler Heating Surface Area
Ft² (m²)
496 (46.1)
Operational Weight
Lb (Kg)
10,700 (4,860)
12,340 (5,600)
Shipping Weight
Lb (Kg)
9,800 (4,500)
11,500 (5,200)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
Max. Electrical Consumption
KVA
Blower Motor Output
HP
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
575, 460, 230 or 208V, 3 phase, 60 Hz
18.6 with MI Check Valve option
18.3 without MI Check Valve option
15
SCFH (Nm3/Hr)
PSIG
6,250 (167.4)
5,880 (158.3)
3 - 5 (natural gas or propane)
83,700 (2,242)
78,800 (2,111)
71,500 (1,916)
67,300 (1,803)
Ft/s (m/s)
38.9 (11.9)
28.7 (8.7)
F (C)
470 (240)
270 (130)
SCFH (Nm3/Hr)
Main Steam Outlet
8" FLG
Safety Valve Outlet
2 x 4‖ for boiler and optional 1¼‖ for economizer
Feedwater Inlet
Fuel Gas Inlet
1" NPT
Inches
2" NPT
3
Automatic "Surface"
Blowdown
Boiler & LVC Drain
/8" NPT
2 x 1" NPT
Chimney Diameter
20" ID
Flame Detector
Overheat Protection
Ultraviolet flame eye sensor
High tube temperature & Low water cut-off.
NOTE:
i. Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
ii. Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
iii. Thermal efficiencies are based on high heating values of fuels.
iv. Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Page 85
Specifications for LX-200
ITEM
Boiler Type
Boiler Horsepower Rating
Maximum Pressure
Equivalent Output
Heat Output
Heat Input
Efficiency (fuel to steam)
Boiler Heating Surface Area
Operational Weight
Shipping Weight
Combustion Control
Combustion System
Ignition System
Power Supply
Max. Electrical Consumption – with
UNITS
LX-200 G
LX-200 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
200
PSIG (Kg/cm²)
170 (11.95) design
Lb/Hr (Kg/Hr)
6,900 (3,129)
6,695,000 (1,687,000)
Btu/Hr
(KCal/Hr)
8,369,000 (2,109,000) 7,876,000 (1,985,000)
%
80
85
Ft² (m²)
387.7 (36.0)
Lb (Kg)
7,650 (3,470)
8,620 (3,910)
Lb (Kg)
6,850 (3,110)
7,820 (3,550)
3 position step burner HIGH-LOW-OFF
Forced draft, pre-mixed burner
Electric spark ignited interrupted gas pilot
575, 460, 230 or 208V, 3 phase, 60 Hz
KVA
24.3
or w/o MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
Main Steam Outlet
Safety Valve Outlet
Feedwater Inlet
Fuel Gas Inlet
Automatic "Surface" Blowdown
Boiler & LVC Drain
Chimney Diameter
Flame Detector
Overheat Protection
NOTE:
i.
ii.
iii.
iv.
v.
vi.
HP (KW)
SCFH (Nm3/Hr)
PSIG
15 (11.2)
8,340 (223.4)
7,850 (211.0)
3 - 5 (natural gas or propane)
112,000 (2,999)
105,000 (2,813)
SCFH (Nm3/Hr)
95,500 (2,559)
89,900 (2,409)
Ft/s (m/s)
25.5 (7.8)
18.8 (5.7)
470 (240)
270 (130)
F (C)
3" FLG
2½" NPT
1" NPT
2" NPT
Inches
3
/8" NPT
2 x 1" NPT
20" ID
Ultraviolet flame eye sensor
High temperature & Low water cut-off.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
Thermal efficiencies are based on high heating values of fuels.
Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
Boiler Safety valve Outlet size may increase if set below 170 PSIG.
With the inverter option (12ppm Low NOx package model) the input is derated to 190BHP(95%) and the heat
in & output, fuel consumption, and the flue gas numbers are reduced accordingly.
Page 86
Specifications for LXL-200
ITEM
Boiler Type
Boiler Horsepower Rating
Maximum Pressure
Equivalent Output
Heat Output
Heat Input
Efficiency (fuel to steam)
UNITS
LXL-200 G
LXL-200 SG
Multiple water tube, once through, forced flow, steam boiler
BHP
200
PSIG (Kg/cm²)
Lb/Hr (Kg/Hr)
15 (1.05) design
6,900 (3,129)
Btu/Hr
(KCal/Hr)
6,695,000 (1,687,000)
%
8,369,000 (2,109,000) 7,876,000 (1,985,000)
80
85
Boiler Heating Surface Area
Ft² (m²)
387.7 (36.0)
Operational Weight
Lb (Kg)
Shipping Weight
Combustion Control
Lb (Kg)
Combustion System
Ignition System
10,150 (4,600)
8,950 (4,060)
9,920 (4,500)
3 position step burner HIGH-LOW-OFF
Forced draft, pre-mixed burner
Electric spark ignited interrupted gas pilot
Power Supply
Max. Electrical Consumption
11,120 (5,040)
575, 460, 230 or 208V, 3 phase, 60 Hz
KVA
19.0
– with or w/o MI Check Valve option
Blower Motor Output
Fuel Consumption
Fuel Supply Pressure
Flue Gas Volume (Wet)
Flue Gas Volume (Dry)
Flue Gas Velocity
Flue Gas Temperature
HP (KW)
15 (11.2)
3
SCFH (Nm /Hr)
PSIG
SCFH (Nm3/Hr)
Ft/s (m/s)
F (C)
Main Steam Outlet
Safety Valve Outlet
Feedwater Inlet
Fuel Gas Inlet
8,340 (223.4)
7,850 (211.0)
3 - 5 (natural gas or propane)
112,000 (2,999)
105,000 (2,813)
95,500 (2,559)
25.5 (7.8)
470 (240)
89,900 (2,409)
18.8 (5.7)
270 (130)
8" FLG
2 x 4" FLG
1" NPT
2" NPT
/8" NPT
Inches
3
Automatic "Surface" Blowdown
Boiler & LVC Drain
2 x 1" NPT
Chimney Diameter
20" ID
Flame Detector
Overheat Protection
Ultraviolet flame eye sensor
High temperature & Low water cut-off.
NOTE:
i.
ii.
iii.
iv.
v.
Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F (100C) steam.
Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
Thermal efficiencies are based on high heating values of fuels.
Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
With the inverter option (12ppm Low NOx package model) the input is derated to 190BHP(95%) and the heat in &
output, fuel consumption, and the flue gas numbers are reduced accordingly.
Page 87
Specifications for LXH-200 (Special)
ITEM
UNITS
LXH-200 SG
Boiler Type
Multiple water tube, once through, forced flow, steam boiler
Boiler Horsepower Rating
BHP
200
Maximum Pressure
PSIG (Kg/cm²)
250 (17.6) design
Equivalent Output
Lb/Hr (Kg/Hr)
6,900 (3,129)
Heat Output
6,695,000 (1,687,000)
Btu/Hr
(KCal/Hr)
Heat Input
7,970,000 (2,008,000)
Efficiency (fuel to steam)
%
84
Boiler Heating Surface Area
Ft² (m²)
397 (36.9)
Operational Weight
Lb (Kg)
10,400 (4,720)
Shipping Weight
Lb (Kg)
9,600 (4,360)
Combustion Control
3 position step burner HIGH-LOW-OFF
Combustion System
Forced draft, pre-mixed burner
Ignition System
Electric spark ignited interrupted gas pilot
Power Supply
575, 460, 230 or 208V, 3 phase, 60 Hz
Max. Electrical Consumption –
KVA
24.3
with or w/o MI Check Valve option
Blower Motor Output
HP
15
3
Fuel Consumption
SCFH (Nm /Hr)
7,940 (205)
Fuel Supply Pressure
PSIG
3 - 5 (natural gas or propane)
Flue Gas Volume (Wet)
106,000 (2,846)
SCFH (Nm3/Hr)
Flue Gas Volume (Dry)
90,900 (2,438)
Flue Gas Velocity
Ft/s (m/s)
19.0 (5.8)
Flue Gas Temperature
270 (130)
F (C)
Main Steam Outlet
3" FLG
Safety Valve Outlet
2½‖ for boiler and optional 1¼‖ for economizer
Feedwater Inlet
1‖ NPT
Fuel Gas Inlet
2‖ NPT
Inches
3
Automatic "Surface"
/8" NPT
Blowdown
Boiler & LVC Drain
2 x 1" NPT
Chimney Diameter
20" ID
Flame Detector
Ultraviolet flame eye sensor
Overheat Protection
High tube temperature & Low water cut-off.
NOTE:
i. Equivalent Output is calculated base on the conversion of 212F (100C) feedwater to 212F
(100C) steam.
ii. Gas consumption based on Natural Gas with High heating value 1,004 Btu/SCF.
iii. Thermal efficiencies are based on high heating values of fuels.
iv. Flue gas temperature & velocity are calculated for Natural Gas with 68F (20C) feedwater.
v. Boiler Safety valve Outlet size may increase if set below 250 PSIG.
vi. With the inverter option (12ppm Low NOx package model) the input is derated to 190BHP(95%)
and the heat in & output, fuel consumption, and the flue gas numbers are reduced accordingly.
Page 88
STANDARD EMISSION FOR MIURA LX SERIES BOILER
LX-G
Stack Temperature
**
500°F
LX-SG
300°F
LXL-G
500°F
LXL-SG
300°F
LX-GI**
500°F
LX-SGI**
300°F
LXL-GI**
500°F
LXL-SGI**
300°F





O2
NOx
CO
5% ± 1%
< 20 PPM
(< 25 PPM*)
< 100 PPM
5% ± 1%
< 12 PPM
(< 15 PPM*)
< 50 PPM
These data are based on shop test boiler with 70°F feed water temperature and 70 PSI steam pressure at
high-fire rates. NOx and CO are corrected to 3% O2 based on Natural Gas combustion.
* the NOx rating based on Propane Gas combustion is shown in brackets.
** with Low NOx Inverter option.
*** stack temperature for reference for chimney design.
With the dual fuel option (natural gas + propane gas train), the NOx level increases due to adjustment
complexity.
Page 89
Required wire gauge for power supply
LX-50
LX-100
LX-150
LX-200
LX-300
LXL-50
LXL-100
LXL-150
LXL-200
LXH-200
LXH-300
VOLTAGE
(V)
INPUT
CURRENT
(A)
575
6.9
480
8.5
230
17.0
575
13.1
480
16.8
230
32.6
575
19.7
480
25.1
230
49.2
#6 × 3 + #8G
60
575
30.6
#8 × 3 + #10G
40
480
38.1
#6 × 3 + #10G
60
230
77.2
#3 × 3 + #8G
100
575
5.2
#14 × 3 + #14G
15
480
6.3
230
12.6
575
11.4
480
14.6
230
28.2
575
17.0
480
21.4
230
42.0
#6 × 3 + #8G
60
575
25.1
#10 × 3 + #10G
30
480
30.0
#8 × 3 + #10G
40
230
62.7
#4 × 3 + #8G
90
575
39.7
#8 × 3 + #10G
40
480
48.4
#6 × 3 + #8G
60
230
97.8
#2 × 3 + #6G
120
WIRE GAUGE
(AWG)
DISCONNECT
AMPERAGE (A)
#14 × 3 + #14G
15
ELECTRICAL
CONSUMPTION
(kVA)
6.8
#10 × 3 + #14G
30
13.4
#8 × 3 + #10G
40
#10 × 3 + #10G
30
20.0
30.4
5.0
#10 × 3 + #12G
30
11.6
#8 × 3 + #10G
40
#10 × 3 + #10G
30
17.0
Page 90
25.0
36.7
12
APPENDIX
Purchasing individual operating manuals ...................................... 92
Page 91
Purchasing individual operating manuals:
If an extra operating manual for this steam boiler should be required, please contact a MIURA sales office
or your local dealer.
Also, please have your operation manual number ready when you call.
MIURA BOILER OFFICES
WWW.MIURABOILER.COM
ATLANTA:
CHICAGO:
1900 THE EXCHANGE SE, SUITE 330
ATLANTA, GA
30339-2022
PHONE: (770) 916-1695
FAX: (770) 916-1858
[email protected]
600 NORTHGATE PARKWAY, UNIT M
WHEELING, ILLINOIS
60090-3201
PHONE: (847) 465-0001
FAX: (847) 465-0011
[email protected]
LOS ANGELES:
NEW YORK:
1945 SOUTH MYRTLE AVE.
MONROVIA, CALIFORNIA
91016-4854
PHONE: (626) 305-6622
FAX: (626) 305-6624
[email protected]
120 SYLVAN AVE., SUITE 4
ENGELWOOD CLIFFS, NJ
07632
PHONE: (201) 592-1260
FAX: (201) 592-1262
[email protected]
MIURA BOILER FACTORY:
MISSISSAUGA:
8 COPERNICUS BLVD.,
BRANTFORD, ONTARIO
N3P 1Y4
PHONE: (519) 758-8111
FAX: (519) 758-5294
[email protected]
6315 SHAWSON DRIVE, UNIT #17,
MISSISSAUGA, ONTARIO
L5T 1J2
PHONE: (905) 564-9199
Page 92
1
Description of Functionality
1)
Combustion Control
2)
1.
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‖ is used to refer to a similar process carried out after boiler
stops, with the blower again operating for a certain period of time to purge residual gas from the
combustion chamber.
If a false flame is identified in the combustion chamber during purging, the purge is continued
and will take place for a certain period of time after extinguishing this false flame. Furthermore,
an alarm is activated if the false flame continues to burn for longer than a predefined time.
The set period for pre-purging is timed from the detection of air pressure following the start of
operation of the blower.
2.
Ignition and combustion
[Gas-fired]
Following pre-purge, ignition sparks are generated and the pilot burner is lit. After a specific
period of pilot burn, the main burner is lit. After another predetermined period, the boiler
transitions to high fire combustion.
If the ―OPERATION‖ switch is turned off during high fire combustion, low fire burn is carried out
for a specific period of time, and then the system performs a post-purge.
3.
Pressure control
If the steam pressure rises over the low-pressure setting during high fire combustion, the system
will switch to low fire combustion. If the pressure then rises over the high-pressure setting,
combustion is ended and the system goes into standby mode.
It should be noted if steam pressure drops during low fire combustion to less than the low
pressure setting’s differential portion, high fire combustion will be restarted. Similarly, if the
steam pressure drops during standby to less than the high pressure setting’s differential portion,
the control system will repeat pre-purging and will then perform ignition.
Feed Water Control
1.
3)
4)
Feed water control is carried out using electrode-type water level detection rods.
Blowdown Control
1.
Automatically modifying the equivalent blowdown time based on combustion conditions, the
control system will perform surface blowdown control in order to maintain a high degree of
steam quality.
2.
The control system constantly monitors the pressure vessel’s conductivity sensor and the
surface blowdown rate in order to perform self-diagnosis.
3.
Timing for blowdown is displayed in accordance with the level of concentration of the boiler
water and the duration of combustion. The system automatically resets this value after
blowdown has been completed.
4.
If the system detects the maximum water level upon startup, it activates blowdown control in
order to adjust to a suitable water level.
Optional Laborsaving Control
1.
The fitting of an automatic bottom blowdown valve makes automatic bottom blowdown control
possible, thus reducing the work required for blowdown-related activities.
2.
Automatic control of the feed-water valve opening and closing is made possible by the fitting of
an automatic feed-water shutoff valve.
Page 93
5)
Safety Devices
1.
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
or main burner
(4) Air pressure problem
- If the air pressure is continuous low during blower operation
(5) Gas pressure problem (gas-fired)
- If gas pressure is not in the set level
(6) Low water level
- If water remains below the normal level when firing is requested
(7) Water level probe problem
- If a serious problem preventing ongoing control occurs, even if the water level control
method has been changed
(8) Triggering of the overheat thermocouple
- If the overheat thermocouple’s temperature rises to a preset level or beyond
(9) Wire breakage in overheat thermocouple
- If an open circuit is detected in the overheat thermostat
(10) Exhaust-gas temperature problem
- If the temperature of the exhaust gas remains constantly above a preset level.
(11) Power failure
- If the supply of power is interrupted while the ―OPERATION‖ switch is on.
(12) Short circuit
- If a ground fault is detected in the ignition transformer or the solenoid fuel valve while
the ―OPERATION‖ switch is turned on.
(13) Overcurrent
- If the thermal relay in the electric motor’s switching device has tripped while the
―OPERATION‖ switch is turned on
2.
A caution will be issued whenever any of the following situations arise. At this time, the boiler
can continue to operate in the current mode of combustion, or if necessary, the control method
can be changed to a new combustion mode.
(1) Insufficient air supply during low fire or high fire combustion
(2) Flame sensor degradation
(3) Degradation of feed-water pump capacity or water supply shortage
(4) Reverse flow
(5) Freeze alert
(6) Problem with water level probe
(7) Broken wire in thermocouple (with the exception of the overheat thermostat)
(8) High circuit-board temperature
(9) Problem with water softener
(Optional specification)
(10) Problem with steam pressure sensor
(11) Air-pressure sensor problem
(12) Blowdown timing reached or buildup of scale
(13) Battery replacement
(14) Inspection of surface blowdown required or problem with conductivity sensor
(15) Communication error
Page 94
3.
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
4.
Self-checking
The control system hardware constantly monitors its own operation, and it will immediately
shutdown operation when an abnormality occurs.
6)
Status Display
The display indicates the boiler’s current operation status using the following text strings.
(1) DISABLE
(2) STAND-BY
(3) FEED WATER
(4) PREPURGE
(5) IGNITION
(6) PILOT
(7) MAIN IGNITION
(8) LOW FIRE
(9) HIGH FIRE
(10) POSTPURGE
(11) PILOT HOLD
(12) LOW FIRE HOLD
(13) PREPURGE HOLD
7)
Monitoring
The following parameters can be output and monitored on the display.
(1) Steam Pressure
(2) Exhaust Gas Temperature
(3) Feed Water Temperature
(4) Scale Monitor Temperature
(5) Overheat Thermostat Temperature
(6) Flame Current
(7) Remaining Blowdown Time
(8) Surface Blowdown Valve On / Off
(9) Water Conductivity
(10) Water Level Condition
(11) Date & Time
8)
Heat Management Data
The display can output the current day’s boiler management data in terms of the following parameters.
(1) Ignition Cycles
(2) Gas-fired Low Fire Duration
(3) Gas-fired High Fire Duration
(4) Gas-fired Average Exhaust-Gas Temperature (low fire)
(5) Gas-fired Average Exhaust-Gas Temperature (high fire)
(6) Average Feed Water Temperature
(7) Gas-fired Boiler Efficiency
(8) Gas Consumption Level
(9) Boiler Makeup Water
(10) Steam Generated
(11) Surface Blowdown Volume
Page 95
9)
10)
Warning Logs
The following details on the seven most recent alarms and cautions can be called up and output on
the display.
1.
Details of the abnormality
2.
Date and time of occurrence
3.
Boiler operating status when abnormality occurred
Communication Functionality
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.
1.
2
Communicated information
(1) Notification of abnormalities
Whenever an abnormality occurs, the control system will send notification containing a
description of the abnormality and other associated information. Specifically, data transfer
is achieved by automatic dialing on the connected telephone line.
(2) Monitoring
The control system outputs data necessary for the regular monitoring of boiler conditions.
(3) Control data
- Heat management data (for current and previous days)
- Abnormality log (seven most recent items)
- Operation log
(4) Setting of control data
An external device can use the communication function to read and overwrite settings.
Guarantee

Refer to your warranty documents for specific details.

A six-month labor warranty from boiler startup may be available. Contact local sales and service
representatives for details. This labor warranty covers routine inspection and repairs at the installation
site. Travel and lodging expenses are not covered, except within local representative service area.

This product is covered by a one-year standard parts warranty from the boiler commissioning date or
for 18 months from the shipping date, whichever occurs first. Express shipping costs for overnight or
next-day delivery of parts are not included. Damage to the boiler or any of its component parts after
leaving the factory is not covered. Parts replaced under this warranty must be returned to MIURA. If any
defective parts are not returned, the customer will be charged for the corresponding item.

The pressure vessel of this boiler is covered by a seven-year limited factory warranty against material
or workmanship defects.
Page 96
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