Miura EJ-210 User manual

i
INSTALLATION
MANUAL
Boiler Operation Terminal
EJ-210
This document was formulated in Japan.
Comply with the regulations and
standards of the country of use regarding
installation and usage.
The specifications of products and
components may vary with country of
use and the site situation.
Contact your dealer or MIURA sales
office for further inquiry regarding this
document.
INFORMATION IN THIS MANUAL MAY
BE CHANGED WITHOUT NOTICE.
Manual Code No.
E20-018-00
BP – TERMINAL

ii
Introduction
This Installation Manual describes the carry-in and installation of the boiler operation terminal EJ-
210(hereinafter called “EJ-210”).
When installing the EJ-210, carefully read and understand the contents of this manual to ensure
that all installation work is performed safely. Warnings in this manual are classified as DANGER,
WARNING, CAUTION, or NOTE, in order of severity.
Indicates an imminently dangerous situation which leads to
serious injury or death to the user, if the product is mishandled.
Indicates a situation which might cause serious injury or death
to the user, if the product is mishandled.
Indicates a situation which might cause minor injury to the user
or the occurrence of physical damage only, if the product is
mishandled.
Describes the precautions to prevent failures of the EJ-210,
points to perform effective operation, and useful information to
know.
DANGER
WARNING
CAUTION
NOTE

iii
Table of Contents
1. PRECAUTIONS DURING INSTALLATION.......................................... 1
2. OVERALL DIMENSIONS..................................................................... 2
2.1. EJ-210 Main Unit................................................................................................ 2
2.2. Steam Pressure Sensor (Optional)..................................................................... 3
3. COMPONENT NAMES ........................................................................4
3.1. Names of Indicators and Buttons ....................................................................... 4
3.2. Layout and Names of Internal Circuit Boards ..................................................... 4
4. REQUIRED PARTS.............................................................................. 5
5. INSTALLATION.................................................................................... 6
5.1. Precautions when Installing the Main Unit.......................................................... 6
5.2. Installing EJ-210................................................................................................. 7
5.2.1. Top of Control Box .................................................................................................7
5.2.2. Boiler Allowing Installation inside the Control Box ..................................................8
5.3. Installing RS-422 Communications Equipment .................................................. 8
5.4. Precautions when Installing the Steam Pressure Sensor................................... 9
6. WIRING.............................................................................................. 10
6.1. Precautions ...................................................................................................... 10
6.2. Wiring Procedures............................................................................................ 10
6.3. Terminal Arrangement on Control Circuit Board ................................................11
6.4. Wires for Use.....................................................................................................11
6.5. Signal Wires ..................................................................................................... 12
6.5.1. AC Input Signal ....................................................................................................12
6.5.2. Output Signal .......................................................................................................12
6.6. RS-422 Communication Line Wiring ................................................................ 13
6.7. M-NET3 Communication Line Wiring ............................................................... 14
6.8. Steam Pressure Sensor Wiring ........................................................................ 15
6.9. Standard Connection Diagrams ....................................................................... 16
7. EXAMPLES OF WIRING ................................................................... 17
7.1. Boiler with BL-model Controller Mounted ......................................................... 17
7.2. Boiler with XJ1-model Controller Mounted ....................................................... 18

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iv
Definition of Terms
The table below describes the terms used in this manual.
The following names are defined in various standards. They are indicated with an asterisk (*) in the text.
Term
Description
AWM2840
Shielded wire defined in “UL Style No. 2840”
CV wire
Power cable defined in “JIS C 3605”
FCPEV
Twisted pair cable for communication defined in “JCS 5402”
HIV wire
Insulated wire defined in “JIS C 3317”
IV wire
Insulated wire defined in “JIS C 3307”

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1. PRECAUTIONS DURING INSTALLATION
Pay attention to the following items during equipment installation and instrumentation work.
(1) When performing grounding work, use IV wire(*) or equivalent from the ground terminal in the
panel. Use a wire diameter equal to or larger than the main power wire (2.0 mm2 or larger).
(2) Do not install an overcurrent protection circuit breaker in the grounding wire.
(3) Connect the power supply wiring from the boiler power supply. Ensure that an earth leakage
circuit breaker (with overcurrent protection) is installed in the boiler power-supply line.
(4) If the power supply wiring is not connected from the boiler power supply, ensure that a dedicated
earth leakage circuit breaker (with overcurrent protection) is installed.
(5) Use a wire with 0.1 MΩ or higher insulation resistance.
(6) Use a wire with 2.0 mm2 or larger diameter.
(7) Do not extend the steam pressure sensor cable.
(8) Ensure that the distance between HUB and the equipment is within 100 m.

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2
400
23
5011535
350
195
23
43
74
153
284
φ30 φ10
φ30
φ20
57
52.5290.5
Data Blow
Normal
Caution B P –T E R M I N A L
Rubber feet
4-M6 (welded nut)
(For installation)
(M-NET3 communication
line wire inlet)
(Steam pressure sensor
wire inlet)
(Power supply/signal
wire inlet)
2. OVERALL DIMENSIONS
2.1.EJ-210 Main Unit
Item
Unit
Specification
Power supply
—
120 VAC, 50/60 Hz, single-phase
Electrical consumption
VA
11 (max.)
Product mass
(Product weight)
kg
3.3
Painting color
—
Light silver (MIURA specified color)

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2.2.Steam Pressure Sensor (Optional)
Individual specifications
Model
YSK-AC10M-333
YSK-AC20M-334
YSK-AC30M-333
Pressure range
0–0.98 MPa
0–1.96 MPa
0–2.94 MPa
Common specifications
Power supply voltage
10.5–28 VDC
Storage temperature
range
-20–80°C
Connection
R1/4
Moisture and water
resistance
JIS D0203 S2
Output
1–5 VDC
Overall accuracy
(at 1013 hPa)
±3%FS (-20–70°C)
±4%FS (70–80°C)
±5%FS (80–90°C)
Gray: Shield
Black: Power supply ground
White: Voltage output
Red: Power supply positive (+)
Power supply positive (+)
Voltage output
Power supply ground
Contact pin No.
Waterproof connector
for relay connection
52117-0340 (white)
(Manufactured by
Molex Japan Co., Ltd.)
Model name plate
Cap (SUS304)
Joint (C3604)
Plastic cap

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I/O board
RS-422
communication
conversion circuit
board EC11
CPU board
OPR board
Switching power
supply
Indicators and buttons
3. COMPONENT NAMES
3.1.Names of Indicators and Buttons
3.2.Layout and Names of Internal Circuit Boards
Data Blow
Normal
Caution BP –TERMINAL
Display
“Data” button
“Blow” button
Status lamps
▲/▼ buttons

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4. REQUIRED PARTS
During installation of the EJ-210, different parts are required according to the boiler installed. Be sure
to check the following points before starting installation.
(1) Boiler with BL-model or XJ1-model controller mounted
For a boiler that has a BL-model or XJ1-model controller, communication occurs between the EJ-
210 and the boiler. The RS-422 communication conversion circuit board EC11 has to be installed
on the CPU board on the boiler side.
(2) Boiler allowing installation inside the control box
If a boiler allows the MI terminal MT1-200 to be installed inside the control box, the EJ-210 can
be installed in the same way. A setting plate and panel name plate are required for installation.
(3) Boiler without BL-model or XJ1-model controller
For a boiler that does not have a BL-model or XJ1-model controller, installation is possible using
the EJ-210 and AC input and output wiring only.

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5. INSTALLATION
5.1.Precautions when Installing the Main Unit
•Install the EJ-210 in a location within the operation environment range (temperature and
humidity).
•Do not install the EJ-210 in a location below. This may result in equipment failure.
(1) Location subject to direct sunlight or near equipment that generates heat
(2) Hot location or location subject to severe temperature fluctuations
(3) Location with high levels of dust or humidity
(4) Location subject to shocks or vibrations
(5) Location with a chemical atmosphere or where equipment may contact chemicals, or
location subject to water splashing
(6) Location close to power transmission lines or near equipment that generates strong
magnetic fields
(7) Location subject to severe power supply voltage fluctuations
•Firmly secure the EJ-210 in a vibration-free position.
•Do not install the EJ-210 in a location subject to water, such as steam or condensation. Check
that condensation along steam piping cannot fall on the main unit of the EJ-210.
•During installation, do not touch circuit boards inside the main unit with bare hands. Take care
that no dirt or metal particles can enter the main unit of the EJ-210.
•When connecting the optional steam pressure sensor, install the EJ-210 in a location where the
wiring between the EJ-210 and steam pressure sensor does not exceed 2 m.
•The EJ-210 is designed for indoor installation only. To install it outdoors, take appropriate
waterproofing, dustproofing, and antifreezing measures, and avoid locations subject to direct
sunlight.
NOTE
The EJ-210 has the same installation dimensions as the MI terminal MT1-
200. If MT1-200 was connected to the boiler, the EJ-210 can be installed in
the same location.
CAUTION
Do not directly weld the EJ-210 to a column or wall. Arcs from welding, etc.
may damage internal electronic components.
CAUTION
Check the points below to confirm that the installation location meets the
required conditions. Installation in an inappropriate location may result in
equipment failure.

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5.2.Installing EJ-210
5.2.1. Top of Control Box
Use the four M6 screws supplied to mount the EJ-210 on top of the control box.
(1) Drill mounting holes in the position where the EJ-210 is mounted.
Mounting dimensions: 115 mm × 350 mm (Refer to the overall view drawings.)
Mounting screws: M6 × 4 (supplied)
(2) Open the top cover of the EJ-210.
(3) Use the M6 screws supplied to secure the EJ-210.
NOTE 1: Use only the screws supplied. If other screws are used, they may contact and
damage the circuit board.
NOTE 2: Do not remove the rubber feet from the EJ-210. Removing the rubber feet may
result in damage to the circuit board when the EJ-210 is installed.
(4) When wiring is complete, close the top cover.
Figure 5-1: Example of installation on top of the control box
Control box
M6
Boiler operation terminal EJ-210
top cover
Boiler operation terminal EJ-210
main unit
Machine
screw
Heat-resistant
tube
Front panel
Plain washer
Spring washer
M6 screw

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5.2.2. Boiler Allowing Installation inside the Control Box
For a boiler model that allows the MI terminal MT1-200 to be installed inside the control box, the EJ-
210 can be installed in the same way. Contact a MIURA sales office for more details.
A parts kit is required to install the EJ-210 inside a control box. Contact a MIURA sales office for
more details.
5.3.Installing RS-422 Communications Equipment
For a boiler that has a BL-model or XJ1-model controller, an RS-422 communication conversion circuit
board EC11 has to be installed in the control box.
Install the appropriate parts of the parts kit corresponding to the boiler. Contact a MIURA sales
office for more details.

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5.4.Precautions when Installing the Steam Pressure Sensor
The EJ-210 can use boiler pressure as control information if the optional steam pressure sensor
is installed on the boiler. Be aware of the following points when installing or wiring the steam
pressure sensor.
•To allow comparison and reading of the pressures at the pressure sensor and the boiler
pressure gauge, install the steam pressure sensor close to the boiler pressure gauge.
•Install the steam pressure sensor vertically.
•Determine the installation position and perform wiring so that water such as steam and
condensation cannot flow along the wires toward the sensor.
•Use a siphon tube or other method to fully cool (as a guide, less than 80°C at the pressure-
receiving area) the piping to the steam pressure sensor.
Figure 5-2: Example of installation of the steam pressure sensor to the boiler pressure
gauge mounting block
蒸気圧力センサ
蒸気圧力スイッチ
圧力計
Steam pressure sensor
Steam pressure switch
Pressure gauge
Low
High

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Signal wire
M-NET3
communication
line wire
CPU board
EC11
OPR board
Switching power
supply
I/O board
RS-422 communication
line wire
Steam pressure
sensor wire
Power supply wire
6. WIRING
6.1.Precautions
(1) Wiring of power supply wires
•Use a wire with 2.0 mm2 or larger diameter for the power supply and crimp ring tongue
terminals.
•Connect the grounding phase of the power supply to the N phase. Be sure to ground the
equipment grounding terminal using a wire with a diameter equal to or larger than the
power supply wire diameter.
Provide Japanese D-type grounding(*) or better.
(2) Wiring of signal wires
•The wires used as signal wires and terminal processing must conform to “6.4 Wires for
Use”.
•Be sure to separate the signal wires, sensor wires, and input/output signal wires from
power output wires and power supply wires. Do not install them in the same conduit. Do
not install signal wires in a location where magnetic and electric fields are generated by
machine tools or next to high-output machinery.
•To mark the wires, use stamped mark tubes or mark bands.
6.2.Wiring Procedures
Perform wiring by passing each wire through the specified wire inlet.
Figure 6-1: EJ-210 wiring procedures

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6.3.Terminal Arrangement on Control Circuit Board
Terminal arrangement on the I/O board is as shown below.
Figure 6-2: Terminal arrangement on EJ-210 I/O board
6.4.Wires for Use
Use wire appropriate for the application that does not exceed the maximum length.
Table 6-1: List of wires
Location used
Standard
Cross-
sectional area
[mm2]
Maximum length
[m]
Remarks
Signal wire
High heat-resistant wire
Example: CV wire(*), HIV
wire(*) + heat-resistant tube
1.25 or larger
5
Procured on-
site
RS-422
communication
line wire
Twisted pair cable
FCPEV(*), φ0.9 mm, 2P,
Copper braided screen
―
2
(Boiler to
equipment)
Procured on
site
M-NET3
communication
line wire
Shielded LAN cable
CAT 5 or above, single-wire
STP straight cable
―
100
(HUB to
equipment)
Procured on-
site
Steam pressure
sensor wire
AWM2840(*) (3-core shielded
cable)
―
2
Supplied as
optional
extra
NOTE 1: The RS-422 communication line wire is required for a boiler with BL-model or XJ1-model
controller mounted.
NOTE 2: The steam pressure sensor wire is required to install the optional steam pressure sensor.
EJ21 I/O board
66545852213 6 79 19 3676P-P1P+ J4 J3 J2 J1 8988
6 79 19 76 3613 22 85 45 5 66P+ P1 P- J3 J2 J1 88 89J4FG
N(S) G(FG)G(FG)
N(S) G(FG) L(R)
L(R)
G(FG)
Power supply (L phase)
Frame ground (FG)
Power supply (N phase)
Signal output
(boiler operation)
Signal output
(emergency stop)
Signal output
(high fire instruction)
Signal output
(combustion instruction)
Signal input (operation)
(L phase)
Steam pressure
sensor (optional)
Signal input (operation)
(N phase)
Signal input (boiler fail)
Signal input (start)
Signal input (high fire)
Signal input
(combustion)
Box terminals
Gray
Red

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6.5.Signal Wires
6.5.1. AC Input Signal
The EJ-210 has the following five AC inputs.
Table 6-2: List of AC input signals
Terminal
number
Signal
name
Connection position on boiler side
5–66
Combustion
signal
Connect to a part that has 120 VAC applied while the solenoid valve
is open, in synchronization with the operation of the solenoid valve for
low fire operation.
45–66
High fire
signal
Connect to a part that has 120 VAC applied while the solenoid valve
is open, in synchronization with the operation of the solenoid valve for
high fire operation.
85–6
Start signal
Connect to a part that has 120 VAC applied during startup of boiler
combustion control.
13–6
Operation
signal
Connect to a part that has 120 VAC applied while the “OPERATION”
switch is ON.
22–6
Boiler fail
signal
Connect to a part that has 120 VAC applied when the boiler is
stopped due to an alarm judgment. In principle, connect to the buzzer
output.
NOTE 1: The connection positions in the table above assume a general MIURA boiler. The
connection position varies depending on the boiler control type and Sequence. Contact
your dealer or MIURA sales office for details.
When MIURA standard Sequence are used, refer to “7. EXAMPLES OF WIRING”.
NOTE 2: When the EJ-210 is connected to MIURA boilers without No. 66 terminal, short-circuit
the No. 66 and No. 6 terminals.
6.5.2. Output Signal
The EJ-210 has the following 5 contact outputs. The No. 19 and No. 79 terminals and No. 36
and No. 76 terminals are required for control. Be sure to make connection with the boiler for
these terminals.
Use the No. J1 and No. J2 terminals and No. J3 and No. J4 terminals if required.
The contact rating is normally-closed contact (b-contact), 250 VAC, 1 A (resistance load).
Table 6-3: List of output signals
Terminal
number
Signal
name
Connection position on boiler side
19–79
Combustion
instruction
This is a contact signal to switch boiler standby and combustion.
Make connection for the No. 19 and No. 79 terminals in series with
the boiler high setting pressure switch wiring.
36–76
High fire
instruction
This is a contact signal to switch boiler combustion and high fire.
Make connection for the No. 36 and No. 76 terminals in series with
the boiler low setting pressure switch wiring.
88–89
Spare
Not used
J3–J4
Emergency
stop
Contacts open when boiler is set to standby during MI control for
safety reasons.
J1–J2
Boiler
operation
During automatic operation under MI control, contacts close when
boiler is operating or open when boiler is not operating.

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6.6.RS-422 Communication Line Wiring
For a boiler with a BL-model or XJ1-model controller mounted, a connection is required to the RS-422
communication conversion circuit board EC11 that is connected to the boiler-side CPU board. Use a
communication line wire (FCPEV(*), 0.9 mm, 2P, copper braided screen) to connect the RS-422
communication conversion circuit board EC11 of the EJ-210 to the RS-422 communication conversion
circuit board EC11 that is connected to the boiler-side CPU board.
Figure 6-3: Wiring of RS-422 communication line wires
NOTE 1: Connect the shield of the communication line wire to the FG terminal of the RS-422
communication conversion circuit board EC11 at the EJ-210 side.
NOTE 2: The RS-422 communication line requires no terminating resistance.
TXD(+)
TXD( - )
RXD( - )
RXD(+)
FG
TXD(+)
TXD( - )
RXD( - )
RXD(+)
FG
FCPEV, φ0.9 mm, 2P,
copper braided screen
Shield
<EJ-210 side>
RS-422 communication
conversion circuit board
<Boiler side>
RS-422 communication
conversion circuit board

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6.7.M-NET3 Communication Line Wiring
Connect the EJ-210 to the hub on the M-NET3 communication system using shielded LAN cable.
Refer to the Installation Manual for the M-NET3 communication system before performing wiring.
To prevent the communication line wire from becoming loose or disconnected, form the wire into an
arc and secure it with a cable tie to the mounting base attached on the EJ-210.
Figure 6-4: Wiring of M-NET3 communication line wires
CAUTION
Before performing wiring of M-NET3 communication line wires, carefully
read the Installation Manual for the M-NET3 communication system.
Perform wiring in accordance with the manual.
A mounting base attachment hole is provided
to the left and right of the M-NET3
communication line wire inlet. Use either hole
depending on the direction of the
communication line wire.
Mounting base
M-NET3 communication line wire inlet
For attaching a
mounting base
Cable tie
Pass a cable tie through the
mounting base and secure the
M-NET3 communication line
wire (LAN cable).
Ensure that the bending radius of the M-NET3
communication line wire (LAN cable) is the manufacturer’s
recommended allowable bending radius or higher. If the
recommended value is unknown, use a radius at least 8
times the outside diameter of the finished wire.

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6.8.Steam Pressure Sensor Wiring
(1) Connect the steam pressure sensor wires after installing the sensor piping.
(2) Pass the steam pressure sensor wires through the bushing in the steam pressure sensor wire inlet.
(3) Connect the steam pressure sensor wires to the specified terminal block on the EJ-210 and the
side face of the EJ-210, as shown in the figure below.
P+ terminal: Red wire (Power supply positive (+))
P1 terminal: White wire (Voltage output)
P- terminal: Black wire (Power supply ground)
FG terminal: Gray wire (Shield)
Figure 6-5: Wiring of steam pressure sensor wires
NOTE 1: Use the FG terminal on the EJ-210 side face.
NOTE 2: The wire colors described above are for the optional steam pressure sensor wires.
P+ P1 P
-
FG
Terminal block
on circuit board
Bushing
Steam pressure sensor wires
Boiler operation terminal
EJ-210 side face
Gray
Red
Black

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6.9.Standard Connection Diagrams
These diagrams show the standard connections between the EJ-210 and boiler.
(1) Boiler with BL-model or XJ1-model controller mounted
Figure 6-6: Connection diagram for boiler with BL-model or XJ1-model controller mounted
(2) Boiler without BL-model or XJ1-model controller
Figure 6-8: Connection diagram for boiler without BL-model or XJ1-model controller
Boiler control box
CPU board
RY board
or
I/O board
Cable
assembly
EC11
EC11
EJ21
CPU board
EJ21
I/O board
Switching
power supply
AC input/output wiring
(procured on-site)
Boiler operation
terminal EJ-210
Boiler control box
AC input/output wiring
(procured on-site)
EJ21
I/O board
Switching
power supply
EJ21
CPU board
EC11
Boiler operation
terminal EJ-210