Mitsubishi Electric GB-24A User manual

Air-conditioner Control System
Centralized Controller
Model: GB-24A Installation Manual
Before installing the controller, please read this Installation Manual carefully to ensure proper operation.
Retain this manual for future reference.
Contents
1. Safety Precautions..................................................... 1
2. Parts List.................................................................... 3
3. Product Features ....................................................... 4
4. System Diagram ........................................................ 5
5. Installation.................................................................. 8
1. Field-supplied parts............................................... 8
2. Maximum length of M-NET transmission lines...... 8
3. Installation............................................................. 9
6. Wiring....................................................................... 12
1. Ground cable. ..................................................... 12
2. Cover removal and installation............................ 12
3. M-NET transmission line..................................... 13
4. LAN connection................................................... 13
7. Initial Setting ........................................................... 14
1. Setting the IP address with dip switches............. 15
2. Setting the service switch.................................... 15
8. Test Run .................................................................. 16
1. Collective operation, ON/OFF............................. 16
2. Service LED display............................................ 16
9. System Wiring Example........................................... 17
10. External Input/Output Usage .................................. 19
1. External signal input function .............................. 19
2. External signal output function............................ 21

1
This manual describes how to install the centralized controller and wiring. Before installing the controller, read the
section carefully to ensure proper installation.
Safety symbols used in this manual
The following symbols are used in this manual to indicate the type and severity of potential consequences that
may result when given instructions are not followed exactly as stated.
Retain the Installation Manual and the Instruction Book for future reference. Make sure both the Installation
Manual and the Instruction Book are given to any future air condition system users.
WARNING Indicates a risk of death or serious injury.
CAUTION Indicates a risk of injury or damage to the controller.
WARNING
CAUTION
1
Safety Precautions
1
Safety Precautions
The controller must be professionally installed.
Improper installation by an unqualified person may
result in electric shock or fire.
Make sure the controller is securely mounted so
that it will not fall.
Only use specified cables. Securely connect
each cable so that the weight of the cable is not
applied to the connectors.
Loose or improper connections may result in heat
generation or fire.
Do not attempt to modify or repair the controller.
Modification or improper repair may result in electric
shock or fire.
Consult your dealer when repairs are necessary.
Securely install the controller according to the
installation manual.
Improper installation may result in electric shock or
fire.
Electric work must be perform by authorized
personnel according to the local regulations and
the instructions detailed in the installation
manual.
Inadequate circuit capacity or improper installation
may result in electric shock or fire.
Ask your dealer or an authorized technician to
move the controller.
Improper installation may result in electric shock or
fire or damage to the controller.
This appliance must be grounded.
Make sure to install a ground wire.
Do not connect the ground wire to gas or water
pipes, lightning conductors or telephone grounding
lines.
Improper grounding may cause an electric shock.
Do not install the controller where there is a risk
of flammable gas.
If the leaked gas accumulates around the controller,
it may ignite and cause an explosion.
Do not use the controller in an environment high
in oil, steam, or sulfuric gas.
These substances may have adverse effects on the
performance of the controller or damage its parts.
Do not install this controller where the ambient
temperature exceeds 104ºF (40ºC) or drops
below 32ºF (0ºC).
To prevent the controller from being damaged and
malfunctioning, install it away from direct sunlight.
Do not install this controller in a place that has
the potential for steam or condensate formation.
Steam or condensate formation may cause an
electric shock or a unit malfunction.

2
CAUTION
When installing the controller in a hospital or communication facility, take appropriate measures to
reduce electrical noise interference.
Inverter equipment, generators, high-frequency medical equipment, or radio communication equipment may
interfere with the normal operation of the controller; or the electrical noise from the controller may interfere
with the medical practice or cause image distortion and static.
To prevent over-heating and fire, wire so that the
weight of the cable will not strain the connectors.
Do not expose the controller to water.
Water may damage the controller and cause an
electric shock.
Use specified wires with the proper current
carrying capacity to prevent current leakage,
over-heating, or fire.
Do not touch the PCB (Printed Circuit
Board) with your hand or a tool. Also do
not get dust on the PCB.
It may cause a fire or malfunction.
To reduce the risk of electric shock, install and
wire the unit with the power to power supply unit
turned off.
Do not install this controller where an acid,
alkaline solution, special chemical spray is
used frequently to avoid electric shock or
malfunction.
Do not press the switches with sharp objects.
It may cause an electric shock or malfunction.
To avoid causing damage or fire, do not apply an
AC voltage or a voltage higher than 30V DC to
the M-NET terminal blocks on the controller.
Do not touch the switches with wet hands.
It may cause an electric shock or malfunction.
Use a security device such as a VPN router when
connecting the GB-24A to the Internet to prevent
unauthorized access.
If no security devices are installed, the operation
settings may be changed by an unauthorized person
without the knowledge of the user.

3
*Please confirm that in addition to this Installation Manual, the following items are shipped with the unit.
* The screws for installing to the metal control panel are not included. (M4 screws)
* In addition to the parts above, a power supply unit for transmission line, which supplies the power to the centralized
controller through the transmission line, must be purchased. If the outdoor unit is a CITY MULTI R410A model, however, the
outdoor unit can also supply the power (Not applicable to the PUMY model).
*1: Each system allows the connection of only one GB-24A.
* Use PAC-SC50/51KUA (power supply unit) when multiple outdoor units are connected. Connect only the M-NET terminal
(TB2) on PAC-SC50/51KUA to the M-NET terminal on GB-24A
No. Part name Qty.
1 Centralized controller 1
2L-fitting 2
3 M3 (8mm (5/16in)) round head screw (for attaching the L-fitting) 4
4 DIN rail attachment 2
5 M3 (6mm (1/4in)) round head screw (for attaching the DIN rail attachment) 8
6 Installation manual (this book) 1
7 Instruction book 1
8 Web browser operation manual 1
9 Operation manual for Initial setting web 1
Unit that supplies the
power to GB-24A
The number of
connectable GB-24A Remarks
PAC-SC51KUA 1 unit *1 xWhen only one GB-24A unit is connected Up to two
other system controllers can be connected to the
transmission line for central control.
(Up to two ON/OFF remote controllers, up to four system
remote controllers, up to four schedule timers, or up to
four group remote controllers can be connected.)
PAC-SC50KUA 1 unit *1 xWhen only one GB-24A unit is connected Up to three
other system controllers can be connected to the
transmission line for central control.
(Up to three ON/OFF remote controllers, up to six
system remote controllers, up to six schedule timers, or
up to six group remote controllers can be connected.)
R410A CITY MULTI
outdoor unit (TB7)
(connected to the
transmission line for
central control)
1 unit x
x
*
x
Replace CN41 (power-supply switch connector) with
CN40 on only one outdoor unit.
Connectable number of indoor units will decrease by
4 units.
CITY MULTI units except the PUMY model (R410A
outdoor units only)
When multiple outdoor units are connected to the
system and the power to the outdoor unit is cut off to
which the GB-24A is connected, that GB-24A will shut
down.
CITY MULTI outdoor unit
(TB3)
(connected to
the indoor/outdoor
transmission line)
1 unit x
x
Connectable number of indoor units will decrease by
4 units.
When multiple outdoor units are connected to the
system and the power to the outdoor unit is cut off to
which the GB-24A is connected, that GB-24A will shut
down.
2Parts List

4
1. Specification
2. Outside dimensions
Fig. 3-1 Unit: in (mm)
Fig. 3-2 Unit: in (mm)
Item Contents
Interface M-NET: 30V/24V DC; 0.13/0.15A
External I/O: 12V DC or 24V DC (External power supply)
Ethernet: 10Base-T
Environmental
conditions
Temperature Operating range: 32 to 104ºF / 0 to 40ºC
Storage range: - 4 to +140ºF / -20 to +60ºC
Humidity 30-90%RH (No condensation)
Dimensions 51/8(H) x 97/8(W) x 11/2(D)in/130 (H) x 250 (W) x 38 (D) mm
Weight 21/2lb. / 1.1kg
Installation Environment In the metal control panel box (indoor)
Install this product indoors.
* This unit is installed and used in a business office, homes or equivalent
environment.
3Product Features
11/2(38)
97/8(250)
POWER LAN LINK/ACT
51/8(130)
1 2 3 4 5 6
Side view Top view
Front view
25/32
(
20
)
25/64
(
10
)
25/32
(
20
)
L-fittings

5
1. System with a power supply unit
* Address setting for each M-NET device (The address cannot be duplicated.)
Address setting method Address
Indoor unit Set an indoor unit as the master unit, and set the rest of
indoor unit sequentially address in the same group.
1-24
Outdoor unit Min. indoor unit address in same refrigerant system + 50. 51-74
BC controller/OS controller
* OS: Subsidiary Outdoor unit
Set the outdoor unit address in same refrigerant system + 1
However, for Sub-BC controller, set the minimum indoor unit
address that connects the local refrigerant piping + 50.
52-74
Mr.Slim Outdoor unit
(M-NET adapter)
Same address as indoor unit.
An M-NET adapter (sold separately) is required.
1-24
M-NET remote controller Set to the minimum indoor unit master address in the same
group + 100.
101-124
MA remote controller Address setting is unnecessary. -
OA processing unit/LOSSNAY After setting all the indoor units, set an arbitrary address. 1-24
4System Diagram
NOTE
* This diagram does not show
the AC power supply wiring.
Only the configuration for
the transmission line is
shown.
To PC
Centralized controller
Model: GB-24A
Power supply unit (optional)
Model: PAC-SC51KUA, PAC-SC50KUA
LAN
M-NET
outdoor unit
M-NET
Group 1 Group 2
Indoor unit
Local remote controller
M-NET transmission line
MA remote controller line
The numbers in the
indicate the address No.
Group 3 LOSSNAY
M-NET
outdoor unit BC controller
R2
Mr. Slim
Outdoor unit
Group 4 Group 5
Mr. Slim
Outdoor unit
M-NET adapter

6
2. System in which power is supplied from an outdoor unit
* Address setting for each M-NET device (The address cannot be duplicated.)
NOTE
* If the outdoor unit
malfunctions or is turned
off, the GB-24A that is
connected to the outdoor
unit will also shut down.
* This diagram does not show
the AC power supply wiring.
Only the configuration for
the transmission line is
shown.
To PC
Centralized controller
Model: GB-24A
LAN
M-NET
outdoor unit M-NET
Group 1 Group 2
Indoor unit
Local remote controller
M-NET transmission line
MA remote controller line
The numbers in the
indicate the address No.
Group 3 LOSSNAY
M-NET
outdoor unit BC controller
R2
Mr. Slim
Outdoor unit
Group 4 Group 5
Mr. Slim
Outdoor unit
M-NET adapter

7
NOTE
*This system controller is designed as a main controller, not as a sub controller.
xMain system controller (main SC)
The main system controller is designed to control all units, including units that other system controllers
control. When there is only one system controller in a system, it will become the main system controller.
Group setting or interlock setting can be made only with the main system controller.
xSub system controller (sub SC)
The sub system controller that controls a local area is controlled overall by the main system controller.
Control area of main SC
Control area of sub SC
Group Group
Group This system controller is designed as a main
controller, so it cannot be controlled by a main
SC (such as Gateway).

8
1. Field-supplied parts
Please obtain the following parts before unit installation.
*1: When installing DIN rail, prepare 1.38inch (35mm) DIN rail. Mounting screws for DIN rail must be also
field-supplied.
Applicable DIN rail types (IEC 60715/DIN 60715): TH35-7.5Fe, TH35-7.5Al
2. Maximum length of M-NET transmission lines
xMaximum length of M-NET transmission =1640 ft/500m *1
xMaximum power feeding length =656 ft/200m *1
Example
Field-supplied parts Specification
Attaching screws M4 screw x 4pcs (when using L-fittings) *1
Protective ground cable Use sheathed vinyl cord or wire.
Wire type : Wire should not be lighter than ordinary PVC sheathed flexible
cord IEC 60227
(designation 60227 IEC 53)
Wire size : 0.75mm2to 2mm2(AWG 18 to 14)
Wire color : green/yellow
Round terminal M4 screw size terminal (used for protective ground cable)
Transmission cable Type of the cable: Shielded cable which comply with the following specifications
or equivalent:
xCPEV: 1.2mm to 1.6mm
xCVVS: 1.25mm2to 2 mm2(AWG 16 to 14)
*CPEV: PE insulated PVC jacketed shielded communication cable
*CVVS: PVC insulated PVC jacketed shielded control cable
PE: Polyethylene PVC: Polyvinyl chloride
NOTE
* 1: Specifications do not include the remote control cables up to 32 ft (10m) in length. If the remote
control cable exceeds 32 ft (10m), the excess must be added to the total length in order to avoid
exceeding the maximum length.
5Installation
Φ
Φ
ℓ2
ℓ3
ℓ5
ℓ6
ℓ8
ℓ7
ℓ1
ℓ
4
Outdoor
unit Indoor Indoor Indoor
Indoor Indoor Indoor
Indoor Indoor Indoor
Outdoor
unit
Remote controller
Remote controller
Power
supply
unit
M-NET transmission line
(Centralized control line)
M-NET transmission line
(Indoor control line)
GB-24A

9
1) Maximum length of M-NET transmission
1 L2+L3+L4+ 1+ 2+ 3 ( 4) =1640 ft/500m
2 L2+L3+L4+ 1+ 5 =1640 ft/500m
3 L2+L3+L5+ 6+ 7 ( 8) =1640 ft/500m
4 3 ( 4)+ 2+ 1+L4+L5+ 6+ 7 ( 8) =1640 ft/500m
5 5+ 1+L4+L5+ 6+ 7 ( 8) =1640 ft/500m
2) Maximum power feeding length for the indoor control line
1 1+ 2+ 3 ( 4) =656 ft/200m
2 1+ 5 =656 ft/200m
3) Maximum power feeding length for the centralized control line
1 L1+L2 =656 ft/200m
2 L1+L3+L4 (L5) =656 ft/200m
3. Installation
Installation methods for the centralized controller GB-24A are shown below.
Method1: Horizontal installation using L-fittings
Attach two L-fittings to GB-24A using the supplied screws (Fig. 5-1), then install GB-24A (Fig. 5-2).
Install the GB-24A in a metal control panel box (steel: thickness 3/64 in (1mm) or more).
When installing follow the metal control panel box clearance space specifications as shown in the Fig. 5-2.
(Install in an area capable of withstanding a 2 1/2 lb (1.1 kg) load.)
Fig. 5-2 Unit: in (mm)
NOTE
If the remote controller cables ( 4, 8) do not exceed 32 ft (10m), the length for 4, 8 do not have to be
factored into the total length.
NOTE
Centralized controller GB-24A is not waterproof.
CAUTION
xL-fittings must be attached at two points on the unit.
xThe unit with L-fittings must be attached at four points to prevent the unit from falling.
NOTE (*1)
When connecting the ground cable after GB-24A is installed, leave some space for mounting screws.
When there is little space for mounting screws, connect the ground cable before GB-24A is installed.
13/16
(
20
)
13/16
(
20
)
2
(
50
)
13/16 (20) *1
M3
M4
11 13/32
(
290
)
Total of 4 screws
(Both sides)
Top view
Fig. 5-1