Hitachi HARC-BX E User manual

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INSTALLATION AND OPERATION MANUAL
MANUAL DE INSTALACIÓN Y FUNCIONAMIENTO
INSTALLATIONS- UND BETRIEBSHANDBUCH
MANUEL D’INSTALLATION ET DE
FUNCTIONNEMENT
MANUALE D’INSTALLAZIONE E D’USO
MANUAL DE INSTALAÇÄO E DE
FUNCIONAMENTO
BRUGER- OG MONTERINGSVEJLEDNING
INSTALLATIE- EN BEDIENINGSHANDLEIDING
HANDBOK FÖR INSTALLATION OCH ANVÄNDING
ÅÃ×ÅÉÑÉÄÉÏÅÃÊÁÔÁÓÔÁÓÇÓÊÁÉËÅÉÔÏÕÑÃÉÁÓ
HARC-BX E
ENGLISH
ESPAÑOL
DEUTCH
FRANÇAIS
ITALIANO
ITALIANO
PORTUGUESDANSK
DANSK
SVENSKASVENSKA NEDERLANDSNEDERLANDS
BUILDING MANAGEMENT SYSTEM (BMS)
CONNECTION ADAPTER

INTRODUCTION
1 / 1
ENGLISH
CONTENTS Page
1 INTRODUCTION _______________________________________ 2
1.1. Preface__________________________________________ 2
1.2. Safety Summary __________________________________ 2
2 SYSTEM CONSTITUTION _______________________________ 4
2.1. System Constitution ________________________________ 4
2.2. Name of parts ____________________________________ 4
2.3. Name of Parts (Control Board) _______________________ 5
2.4. Specifications of HARC-BX E ________________________ 6
3 INSTALLATION WORK _________________________________ 7
3.1. Selection of Installation Place ________________________ 7
3.2. Installation Procedures _____________________________ 7
4 WIRING CONNECTION__________________________________ 8
4.1. Wiring___________________________________________ 8
4.2. Electrical Wiring __________________________________ 10
4.3. Arrangement of the Installation of PCB and H-LINK
Terminals _______________________________________ 11
5 TEST RUN ___________________________________________ 12
5.1. Setting of Dip Switch ______________________________ 12
5.2. Test Run _______________________________________ 13
5.3. Abnormal Indication _______________________________ 15
6 MAINTENANCE AND SERVICE__________________________ 15
6.1. Self-Inspection for HARC-BX E ______________________ 15
6.2. Troubleshooting __________________________________ 16
6.3. Periodical Inspection ______________________________ 18

1 / 2
INTRODUCTION
1INTRODUCTION
1.1. Preface
■ This BMS connection adapter is applied to the packaged air conditioners.
■ Do not place the adapter in a place where flammable gas, or oil mist may stay exit, it
will cause a fire, a fire disaster, deformation of machines, corrosion or breakage.
- Places where oil mists or steams drifts.
- Places where sulfide gas form as hot spring drifts.
■ Do not install air conditioner in the following places, it may cause corrosion to the
machine.
- Places where high in salt contents surrounding as coast regions.
- Places where with atmosphere of acidity and alkalinity humid place
■ In case of using a medical equipment generating electro-magnetic waves, HARC-BX E
should be installed in an area where free from direct radiation to avoid malfunction of
package air conditioners.
■ In case of using those equipment and radios generating electro-magnetic waves,
HARC-BX E should be placed where a location is at least 3 m away from this
equipment to avoid any radiation transmitting in the air.
■ This interface HARC-BX E must be installed in places free of radio-frequency radiation
because it could cause communications interruptions between the interface and the
upper LON controller.
■ Avoid placing the adapter where exposed to direct sunlight.
1.2. Safety Summary
■ Read and understand this “SAFTETY SUMMARY” before the installation work.
■ The precautions described on this manual are distinguished as “WARNING” and
“CAUTION”. “WARNING” indicates specifically high risk to have serious
consequences caused by the improper installation, which could result in severe
personal injury or death. However, “CAUTION” indicates there is still possibility of risk,
which could result in serious consequences circumstantially. The both precaution signs
contain important description of safety to follow.
■ Conduct test run and check if there are any abnormality after the installation work has
completed.

INTRODUCTION
1 / 3
ENGLISH
 Explanation of signs
Õ DANGER:
This sign indicates where user mishandles or misapply its operation, which could
result in severe personal injury or death.
 CAUTION:
This sign indicates general users or non-specific users are forced to act.
Ô ATTENTION:
This sign indicates restriction.

Installation action
Ô WARNING:
-Ensure that installation is done by following this manual to avoid any electric
shock, fire disaster and injury by falling down HARC-BX E.
-Check to ensure that the adapter is fixed firmly to avoid injury by falling.
-To avoid the fire or fire disaster, do not install the adapter in a place where there
are possibility of generating or flow of flammable gases.

Electrical Work
Ô WARNING:
-To avoid any electric shock, ask the shop where a qualified electrician is
provided to do the electrical work.
-Electrical work should be done according to “the local regulations” and
“Installation Maintenance Manual”, and ensure to use the specific circuit to avoid
insufficient electrical circuit capacity or installation defect which will cause any
electrical shock and fire hazards causing.
-Specific cables, which connected between package air conditioner and
HARC-BX E and upper monitoring equipment and HARC-BX E should be
applied to avoid miss-select the cables, which will cause fire hazards and
electrical shock.
-When the cover of HARC-BX E is needed to open due to any electrical wiring
works or inspections, power supply should be completely switched OFF to avoid
any electrical shock.
-It must be installed a disconnection device in the power supply (magnetic circuit
breaker, switch or similar).

2 / 4
SYSTEM CONSTITUTION
2SYSTEM CONSTITUTION
2.1. System Constitution
The Internal Constitution of BMS connection using HARC-BX E is displayed in the Figure
below.
The description of HARC-BX E is written on this manual. As for the other equipment to
setup the system, read the attached installation manual respectively.
(*1) L ON W ORKS
®
is the Register trademark of Echelon Corporation in US and other countries
Ô WARNING:
-Ensure that shield wire is grounded
2.2. Name of parts
Name of each part of HARC-BX E is diplayed in the figure below.
1
2
3
4
o Power Source Terminal to conect to
AC220~240V Power Source
p Earth Terminal to be ground
q Terminal Board for Unit Transmission to
connect H-Link
r Terminal Board for Upper System, to
connect Transmission Line for Upper
System Monitoring
Outdoor Unit Outdoor Unit Outdoor Unit Outdoor Unit
Indoor Unit Indoor Unit Indoor Unit Indoor Unit
HARC-BX E HARC-BX E
L ON W ORKS
®
(*1) Network
The range
wich Hitachi
provides
Upper monitoring
system

SYSTEM CONSTITUTION
2 / 5
ENGLISH
2.3. Name of Parts (Control Board)
o PSW No. 1 (M.CLR): Push Switch for
checking connected unit quantity
p 7-Segment (*): Present state of
HARC-BX E
q PSW No.2 (LON-SERV): Push Switch for
transmission neuron ID. (Service Pin)
r 8P DSW No. 1 (S201) (**): Dip Switch
System Setting of HARC-BX E
s 8P DSW No. 2 (S202) (***): Dip Switch for
setting Functions of HARC-BX E .
t Power Source Display LED (PWR): Light
is ON when the pòwer is supplied.
u Transmission Display LED (H-L):
Transmission state with H-LINK
v Transmission Display form Upper
System LED (LON): Transmission state
with Upper Monitoring Equipment
(*) 8P DSW No.1 S201:
Read 5.1 “Setting of Dip Switch” for the detail and function of HARC-BX E .
(**) 8P DSW No.2.S202:
Read 5.1 ”Setting of Dip Switch”.8P DSW No.1 and No.2 are used for self-inspection. for
details, refer to the 6.1 “Self-Inspection of HARC-BX E ”.
(***) 7-Segment:
Read 5.2 “Test Run” 5.3 “Abnormal Indication” for the details of 7-Segment’s display.

2 / 6
SYSTEM CONSTITUTION
2.4. Specifications of HARC-BX E
■ Hardware Specification
Item Specification
Power Source AC240V±10%(50/60Hz)
Power Consumption 30W(max)
Outer Dim Width:240 mm, Height:285 mm, Depth:128.5 mm
(When installed inside box)
Mass 2.3kg
Installation Condition Indoor
Temperature Condition 0~45 °C
Humidity Condition 10~80% (No dewing)
■ Telecommunication Specifications for Packaged Air Conditioner
Item Specifications
Communication Unit Packaged Air Conditioner
Communication Line Non-polar 2 wire system
Telecommunication System Half-duplex Telecommunication
Synchronous System Asynchronous Communication Method
Telecommunication Speed 9600 bps
Wiring Length 1000 m (Total length)
Quantity of Connection
Standard Type:Max. quantity of units;64
Option A Type:Max. quantity of units;64
Option B Type:Max. quantity of units;32
■ Telecommunication Specifications for Upper System
Item Specifications
Communication Unit Upper monitoring equipment
Transmission Protocol Lon Talk Protocol (*1)
Access Method Predicted persistent CSMA/CD System
Coded System Differential Manchester Code
Telecommunication Speed 78000 bps
Maximum Wiring Length 500 m (Bus Total length)
(*1) Lon Talk is a Registered Trademark of Echelon Corporation in U.S. and other countries.

INSTALLATION WORK
3 / 7
ENGLISH
3INSTALLATION WORK
This manual provides operational instructions for HARC-BX E from installation to turning
on the power source. The procedure of the instruction is described in the table below.
Handling Procedure
No. Items Contents
1 Selection of Installation Position The precautions on the installation
2 Installation Work Installation Method and its precautions
3 Wiring Connection Manner Power Supply and Wiring Procedure for
Communication
4 Setting of Dip Switch Description of Dip Switch and its Setup
Method
5 Power Supply Points to be checked
3.1. Selection of Installation Place
Select a suitable place to install as applicable to the following conditions:
1. The appropriate installation place should be as described in Preface of this manual.
2. The installation place should be within the grounded Control Panel made of metal.
3.2. Installation Procedures
1. Install the HARC-BX E by keeping the screw terminal board at the lower side.
Upper
Downward (Horizontal Installation)
9
99
9✕
✕✕
✕9
99
9
Correct Incorrect Correct

4 / 8
WIRING CONNECTION
2. Fixing Method by Screw(M4) (Screws: Field-supplied)
By using screw (M4 Screw, 4Position), fix HARC-BX E on the wall.
4WIRING CONNECTION
Read and understand SAFETY SAMMARY as described in the beginning of this manual
before starting up wiring work.
■ Wiring work should perform according to”the local regulations” and the instruction of
utility company beforehand.
■ Wiring work should be perfomed by qualified electrician.
■ Electircal leakage breaker should be porvided according to “the local regurations”.
4.1. Wiring
1. Wiring work of Power supply Wiring for HARC-BX E, transmission cable between
packaged air conditioners, and transmission cable between upper monitoring
equipment are required for HARC-BX E.

WIRING CONNECTION
4 / 9
ENGLISH
2. Wiring Method.
No. Connecting Equipment Specifications of Wiring
o
Power Source Wiring for HARC-BX E AC100V 2mm
2
2coresshield
p
Earth (ground) Cable Follow the Local Standard
q
Upper Monitoring Equipment
Follow the instructions of Management
person on the upper system equipment.
(*2)
r
Transmission Line for Package Air
Conditioners 1P-0.75 mm
2
Twisted pair cable (*1)
(*1) Ensure to apply Twisted cable
Recommended Cable Types:
-
Japan Cable
Industrial
Associations
Hitachi Cable
Co., Ltd.
Japan Cable
Co., Ltd.
Integral power
consumption
Non-shielded JKEV KPEV KNPEV KPEV
Shielded
(Copper Foil) JKEV-S KPEV-S KNPEV-S KPEV-S
Shielded(Twisted) JKEV-SB KPEV-SB KNPEV-SB KPEV-SB
(*2) L ON W ORKS ® Network Cable
Use the cable that Echelon Co., Ltd. recommends and follow the instructions of the
manufacturer of the upper monitoring equipment.
For the details on this, refer to the manual, Echelon Co., Ltd. provided, ”FTT10A Free
Topology Transceiver User’s Guide”. As for the user’s reference, cable types and
characteristics of parameter are described in the table below.
AC 100-240V
Power Source
Upper Monitoring
Equipment
Package Air Conditioner Package Air Conditioner

4 / 10
WIRING CONNECTION
■ Cable Type and Characteristics
Cable Diameter of
Wire/AWG
Electric
Resistivity
Ω
ΩΩ
Ω/km
Capacitance
nF/km
Vprop % of
Light Velocity
Belden 85102,
Single/Twist pair, Q’ty of
Core 19/29, Without
Shield, 150 °C
1.3mm/16 28 56 62
Belden 8471,
Single/Twist pair, Number
of Core 19/29, Without
Shield, 60 °C
1.3mm/16 28 72 55
Level VI 22AWG, Twist
pair, Single Core, Without
Shield
0.65mm/22 106 49 67
JY(St)Y2×2×0.8, 4 Lines
Spiral Twist, Single Core,
With Shield
0.8mm/20.4 73 98 41
TIA568A Category 5,
24AWQ,Twist Pair 0.51mm/24 168 46 58
In case of using a shielded cable, the cable should be connected to the ground through
film resistance of metal, range of 470kΩ1/4W(wattage) and accuracy of error under 10%
to prevent from building up of static charges.
4.2. Electrical Wiring
1. Turn OFF the main power switch connected to the wire of HARC-BX E and the
surrounding equipment to connect wire.
2. Wiring work should be conducted according to the table described below. The “No.”
showing in the table indicates the wire of “Wiring Method”.

WIRING CONNECTION
4 / 11
ENGLISH
■ Electrical Wiring
Section No. Wiring Method Remarks
1φ220/240V power
Source HARC-BX E
o
Power Line
Earthling Wire
p
Upper System
Monitoring Equip.
HARC-BX E
q
Non-polar
Control
Circuit
HARC-BX E
Package Air
Conditioner
r
Non-polar Refer
to Sec.4.3
4.3. Arrangement of the Installation of PCB and H-LINK Terminals
As described in the figure below, 8 PCBs which are built into HARC-BX E and H-LINK
Terminals correspond to the both sides of the same numbers, 1 to 8 within and
respectively.
In order that PCB would be able to communicate with unit it must be connected to same
H-LINK than unit.

5 / 12
TEST RUN
5TEST RUN
5.1. Setting of Dip Switch
1. Setting Dip Switch before power supply.
2. Remove the front board to set Dip Switch.
3. Dip Switch setting for each PCB is different.
4. Setting for 8 Pins Dip Switch (S201)
Setting of 8 Pins DipSwitch (S201) are determined by the system numbers and the unit
numbers of the applicable Indoor Units to which the PCB controls.
Setting procedure for the system number and the unit number are as shown in the
table below.
8 Pins Dip Switch
Setup (S201) Description
ON1 2 3 4 5 6 7 8
System
No.
Unit
No.
Setting of 8 pins DSW (S201) are determined by the system numbers and
the unit numbers of the applicable Indoor Units to which the PCB controls.
In case of the standard specification and option A specification, PCB will
control 8 units from the system No. and unit No, which have been set. For
instance, if system No.1 along with unit 1 is set, relevant PCB will control
unit No.1 to 8 from system No.1. The unit No. should be set from either of
No. 1 or 9.
In case of option B, PCB will control 4 units from the system and unit
numbers, which have been set. For instance, if system No.1 along with
unit No. 1 is set, relevant PCB will control unit No. 1 to 4 from system
No.1. The unit No. should be set from either of No.1, 5, 9 or 13.
The details are outlined below.
Setting for the required system numbers are described in the table below.
System
No.
Setting Pin
No.1 to No.4
System
No.
Setting Pin
No.1 to No.4
System
No.
Setting Pin
No.1 to No.4
System
No.
Setting Pin
No.1 to No.4
0
ON 1 2 3 4 5 6 7 8
4
ON 1 2 3 4 5 6 7 8
8
ON 1 2 3 4 5 6 7 8
12
ON 1 2 3 4 5 6 7 8
1
ON
1 2 3 4 5 6 7 8
5
ON 1 2 3 4 5 6 7 8
9
ON 1 2 3 4 5 6 7 8
13
ON 1 2 3 4 5 6 7 8
2
ON
1 2 3 4 5 6 7 8
6
ON 1 2 3 4 5 6 7 8
10
ON 1 2 3 4 5 6 7 8
14
ON 1 2 3 4 5 6 7 8
3
ON 1 2 3 4 5 6 7 8
7
ON 1 2 3 4 5 6 7 8
11
ON 1 2 3 4 5 6 7 8
15
ON 1 2 3 4 5 6 7 8

TEST RUN
5 / 13
ENGLISH
Next, setting for the required unit numbers are described below.
System
No.
Setting Pin
No.5 to No.8
System
No.
Setting Pin
No.5 to No.8
System
No.
Setting Pin
No.5 to No.8
System
No.
Setting Pin
No.5 to No.8
1
ON 1 2 3 4 5 6 7 8
5
ON 1 2 3 4 5 6 7 8
9
ON 1 2 3 4 5 6 7 8
13
ON 1 2 3 4 5 6 7 8
5. Setting of 8 Pins Dip Switch (S202)
Setting of 8 Pins DipSwitch (S202) is determined depending of the PCB quantity for
each H-LINK line.
Setting procedure for the system number and the unit number are described in the
table below.
8 Pins Dip Switch Setup
(S202) Description
ON 1 2 3 4 5 6 7 8
Set only 1 PCB among other PCBs in a single H-LINK.
ON 1 2 3 4 5 6 7 8
Set the rest of the PCB other than the above.
5.2. Test Run
1. Check if all procedures for “Wiring Connection” and “Dip Switch Setup” are completed.
2. Turn ON the Power supply according to the following procedure.
Switch ON the packaged air conditioners.
And then, Switch ON the HARC-BX E.
3. Check the connection of HARC-BX E.
The 7-Segment display will change as described in the table below, after switching ON
HARC-BX E.Check the 7-Segment display.
Step 7-Segment Display Status
1
-
Power OFF
2

End of system initialization
3

Under Checking of Package Air Conditioner, Remote
Control Switch Group Connection Q’ty
4

Normal Transmission Between HARC-BX E, and Package
Air Conditioner are undertaking.

5 / 14
TEST RUN
4. Check how many numbers of identified Indoor unit.
The amounts of Indoor unit, which HARC-BX E has identified will display on the
7-Segment after pressing the PUSH SWITCH (PSW [M.CLR]) on HARC-BX E with
indicating ”” on the 7-Segment display. (Check if the amounts of actual Indoor Units
are identical to these).
5. After the quantity of recognizable Indoor Units are found, check the system numbers
and unit numbers of the Indoor Units, which HARC-BX E has identified.
Switch ON the Pin No. 2 of 8 Pins DipSwitch (S202). All the system numbers and unit
numbers of the recognizable Indoor Units will display on the 7-Segment after pressing
the PUSH SWITCH (PSW[M.CLR] on HARC-BX E. If the multiple Indoor Units are
identified, the system numbers and unit numbers of the identified Indoor Units will be
sequentially displayed by every pressing of PUSH SWITCH (PSW[CLR]). The system
numbers will display on the left side of 7-Segment and the unit numbers will display on
the right side. (Check if the quantity of actual Indoor Units are identical to these).
8 Pins Dip Switch
Setup (S202)
ON
1 2 3 4 5 6 7 8
7-Segmen
t
Display
Description
7-Segmen
t
Display
Description
7-Segmen
t
Display
Description
7-Segmen
t
Display
Description

System
No. 1
or
Unit No. 1

System
No. 5
or
Unit No. 5

System
No. 9
or
Unit No. 9

System
No. 13
or
Unit No. 13

System
No. 2
or
Unit No. 2

System
No. 6
or
Unit No. 6

System
No. 10
or
Unit No. 10
+
System
No. 14
or
Unit No. 14

System
No. 3
or
Unit No. 3

System
No. 7
or
Unit No. 7

System
No. 11
or
Unit No. 11

System
No. 15
or
Unit No. 15

System
No. 4
or
Unit No. 4

System
No. 8
or
Unit No. 8
)
System
No. 12
or
Unit No. 12

System
No. 16
or
Unit No. 16
6. Switch OFF the Pin No. 2 of 8 Pins Dip Switch (S202) after completing all the
checking. Test Run has completed
.
8 Pins Dip Switch
Setup (S202)
ON
1 2 3 4 5 6 7 8

MAINTENANCE AND SERVICE
6 / 15
ENGLISH
5.3. Abnormal Indication
1. Abnormality will be identified with 7-Segment Display of HARC-BX E .
7-Segment
Display Phenomenon Content of Abnormality

Abnormality in Initial Connection at
No Remote Control Switch Group
were found (failure to conform the
connection).

Transmission Abnormality in Entire
Remote Control Switch Group
No response for 70 seconds after the
remote control switch group has been
conformed.
6MAINTENANCE AND SERVICE
6.1. Self-Inspection for HARC-BX E
Self-Inspection to identify the abnormality of HARC-BX E can be conducted by the
following procedures.
1. Turn ON the power supply with leaving 8 Pins DSW [S202] OFF. (The 7-Segment
shows “” and is lit OFF).
ON
1 2 3 4 5 6 7 8
8 Pins DSW (S202)
2. Turn ON only No. 1 pin of 8-pin DSW (201).
7-Segment Display
ON
1 2 3 4 5 6 7 8
 
8 Pins DSW (S201) Normal Abnormal
3. Turn OFF No. 1 pin of 8-pin DSW (201), and turn ON only No. 2 pin
(This work should be conducted with setting End Terminal Resistance on H-Link
additionally).
7-Segment Display
ON
1 2 3 4 5 6 7 8
 
8 Pins DSW (S201) Normal Abnormal

6 / 16
MAINTENANCE AND SERVICE
4. Turn OFF No. 2 pin of 8-pin DSW (201), and turn ON only No. 3 pin.
7-Segment Display
ON
1 2 3 4 5 6 7 8
*
8 Pins DSW (S201)
* The total number of pins that have been set ON from No. 1 to NO. 5 out of 8 Pins DSW [S202] will appear on
the right side of display, and “3” on the left side of display.
5. Turn OFF No. 2 pin of 8-pin DSW (201), and turn ON only No. 3 pin.
7-Segment Display
ON
1 2 3 4 5 6 7 8
 
8 Pins DSW (S201) The above indication will be
repeated
6.2. Troubleshooting
The following table indicates possible trouble-shooting upon the abnormal operation in the
unit.
Ensure that power supply is switched OFF before starting the check.
No. Phenomenon Items to be checked Action
Check if power cable is connected. Connect power cable.
Check if power is supplied.
Power source voltage should be
measured. If the voltage measure shows
out of normal range of
100~240
± 10%[V], wire systems and
wiring procedures should be inspected
and examined.
Check if Power Supply Display
(PWRs ON).
Lighting OFF indicates that there is a
possibility of the failure of internal power
source. Contact your nearest service
centre.
Check if power supply terminal
screws are loosed. Ensure to tighten firmly.
Check if LED (PWR or transmission
display is lit).
Check the transmission circuit of air
conditioners by the self-inspection
function. And check the circuit if
transmission circuit in packaged air
conditioners is operating normally.
Check if LED (LON or transmission
display is lit).
Check the upper transmission circuit by
self-inspection function. And check the
circuit if upper transmission circuit is
operating normally.
1
HARC-BX E does
not activate even
though power
supply is ON.
(No indication on
the 7-Segment).
Check if LED (LON or transmission
display is blinking on the regular
intervals (1 to 2sec)).
Blink indicates that there is a possibility
of the failure of internal power source.
Contact to your nearest services
centre.

MAINTENANCE AND SERVICE
6 / 17
ENGLISH
No. Phenomenon Items to be checked Action
Check if the Dip Switches on
HARC-BX E are set correctly.
Dip Switch should be re-set according to
the section 4.1 in the installation
maintenance manual and operation manual
for how to set HARC-BX E Dip Switch.
Check if the system and address of
the air conditioner are set correctly.
Address should be re-set according to the
section 4.2 in the installation maintenance
manual and operation manual.
Check if transmission cable with air
conditioners is disconnected. Connection of wire should be examined.
Check if manufacturer’s specified
transmission cable connected with air
conditioners is used.
Use Twist pair cable (0.75 mm
2
).
Check if transmission cable connected
with air conditioners is wired along the
power source wire.
Provide a space of at least 150 mm
between wires.
Check if end terminal resistance and
quantity on the transmission cable
between air conditioner are set
correctly.
Only one end resistance should be set in
one system.(Resistance between wire is
approx. 150
Ω ).
Check if transmission circuit is
operating normally upon the self-
inspection.
End resistance should be set to the
transmission wire of air conditioner.
Check if the power supply of air
conditioners is ON. Air conditioner should be turned ON.
Check if transmission cable between
air conditioners is disconnected. Connection of wiring should be examined.
Check if LED (H-L) for transmission
display is ON.
Check transmission circuit of air
conditioner by self-inspection. And check if
transmission circuit of air conditioners is
operating normally.
2
HARC-BX E does
not identify the air
conditioner even
though power
supply is ON.
(“” displayed on the
7-Segment).
After the indication
of “” on the
7-Segment with
check mode, the
quantity of actual air
conditioners did not
identical to these
addresses.
Check if LED (H-L) for transmission
display is OFF.
Check transmission circuit of air
conditioner by self-inspection. And check if
transmission circuit of air conditioners is
operating normally.
Check if manufacturer’s specified
transmission cable connected with air
conditioners is used.
Use Twist pair cable (0.75 mm
2
).
Check if transmission cable connected
with air conditioners is wired along
power source wire.
Provide a space of at least 150 mm
between wires.
Check if end terminal resistance and
quantity on the transmission cable
between air conditioners are set
correctly.
Only one end resistance should be set in
one system.(Resistance between wire will
be approx. 150
Ω ).
Check if transmission circuit is
operating normally upon the self-
inspection.
End resistance should be set to the
transmission wire of air conditioners side.
Check if the power supply of air
conditioners is ON.
Air conditioners should be turned ON.
Check if manufacturer’s specified
transmission cable connected with air
conditioner is used.
Use Twist pair cable (0.75 mm
2
).
Check if transmission cable connected
with air conditioner is wired along
power source wire.
Provide a space of at least 150 mm
between wires.
Check if end terminal resistance and
quantity on the transmission cable
between air conditioner are set
correctly.
Only one end resistance should be set in
one system. (Resistance between wire will
be approx. 150
Ω ).
3
7-Segment indicates
“”.
Check if transmission circuit is
operating normally upon the self-
inspection.
End resistance should be set to the
transmission wire at the air conditioner
side.

6 / 18
MAINTENANCE AND SERVICE
6.3. Periodical Inspection
The unit should be periodically inspected in order to ensure dependable performance and
long life operation.
1. Ambient Conditions:
- Inspect that the internal temperature of cabinet panel is not abnormally too high.
- Inspect that the temperature of unit case is not abnormally too high.
- Inspect and remove any dusts, fine metal powder and lubrication.
2. Displays:
- Check that power supply display LED (PWR) is lit.
- Check that transmission display LED (H-L,LON) shows ON/OFF.
- Check if 7-segment shows other digits other than “”.
3. Mounting and connected Part:
- Check to ensure that the mounting screws, power supply, transmission cable screws
are tightened firmly.
- Check to ensure that the other screws are tightened firmly.
Ô WARNING:
Do not use the cleaning agent containing acid compound such as thinner for
cleaning. If used, it may cause of discoloration of the coating surface and melting of
plastic case.