Mitsubishi Electric Central Controller GB-50A User manual

Mitsubishi Electric Air-conditioner Network System
Central Controller
Model: GB-50A Installation Manual
Contents
Before using the controller, please read this Installation Manual carefully to ensure correct
operation. Store this Installation Manual in a location that is easy to find.
1. Safety Precautions to be Observed without Fail ..........1
2. Confirmation of Parts .................................................3
3. Product Feature.........................................................4
4. System Diagram ........................................................5
5. Installation Method ....................................................7
1. Part prepared at site ..............................................7
2. Allowable length of M-NET transmission lines.........7
3. Installation method ................................................8
6. Wiring Method .........................................................11
1. Grounding cable. .................................................11
2. Cover removal and installation .............................11
3. M-NET transmission line ......................................12
4. LAN connection ...................................................12
7. Initial setting............................................................13
1. How to set the IP address with dip switches .........14
2. Setting of the service switch.................................14
8. Test Run .................................................................15
1. Collective operation ON/OFF ...............................15
2. Service LED display.............................................15
9. Example for System Configuration............................16
1. To control a K control model ................................16
2. To use system controllers on multiple units ..........16
10. External Input/Output Usage Method ......................16
1. External signal input function ...............................16
2. External signal output function .............................18

1
This manual describes the installation of the central controller and wiring to the air conditioner. Refer to the
installation manual of the air conditioner. Carefully read item “1 Safety precautions to be observed without fail”
before installing the unit.
* Hazards and levels of danger that can occur due to incorrect handling are classified by the following symbols.
WARNING Incorrect handling can result in death, serious injury, etc.
CAUTION Incorrect handling can result in injury or damage to the building or its contents.
* After reading this manual, keep in a handy place. When removing or repairing the unit, give this manual to the
installer. When the user changes, also give to the new user.
WARNING
CAUTION
Do not install the controller in a place
where flammable gas could leak.
If gas leaks and collects around the unit, it
may cause a fire or explosion.
Do not install this controller in a place
where the ambient temperature exceeds
40ºC (104ºF) or drops below 0ºC (32ºF),
also do not install in a place where it is
exposed to direct sunlight.
It may cause a deformation or malfunction.
Do not use this controller in an
abnormal environment.
If the controller is used in a place where there is
much oil (including machine oil), steam o
r
sulfide gas, the performance of the controlle
r
may deteriorate or parts may be damaged.
Ask your dealer or technical
representative to install.
If incorrect installation is done by a customer, it
may cause an electric shock, fire, etc.
Securely install the controller according
to the installation manual.
If installation is not correct, it may cause an
electric shock, fire, etc.
Securely install in a place which can
withstand the weight of the controller.
If it is not enough, the unit may fall and
cause an injury.
The electric work should be perform by
authorized personal according to the
installation manual.
A
ny lack of electric circuit or any deficiency
caused by installation may result in an
electric shock or fire.
Securely connect the wiring using the
specified cables and fix them so that the
stress from the cables is not applied to
the terminal connection sections.
If connection or fixing is not reliably
connected, it may cause heat generation, a
fire, etc.
Do not move and re-install the unit by
yourself.
If installation is not correct, it may cause an
electric shock, fire, etc.
A
sk
y
our dealer or technical re
p
resentative.
Never modify or repair by yourself.
If the controller is modified or a repair is not
correct, it may cause an electric shock, fire,
etc.
Consult your dealer if repairs are necessary.
Do not install this controller in a place
where steam is generated such as
bathroom, kitchen, etc.
Avoid placing where water condenses on
the walls. It may cause an electric shock or
malfunction.
1 Safety Precautions to be Observed without Fail
This appliance must be earthed (grounded).
Make sure to install a protect earth(PE)/grounding line .
Do not connect the PE (grounding) line to gas or water
pipes, lightning conductors or telephone grounding lines.
Improper grounding may cause an electric shock.

2
CAUTION
Do not touch the PCB (Printed Circuit
Board) with your hand or a tool. Also do
not get dirt on the PCB.
It may cause a fire or malfunction.
Do not touch the switches with wet hands.
It may cause an electric shock or
malfunction.
Do not press the switches with sharp
objects.
It may cause an electric shock or
malfunction.
Do not connect an AC power source to the
M-NET terminal blocks of this device.
It may cause a breakdown or fire.
Use specified wires corresponding to
the current capacity for wiring.
Otherwise it may cause power leakage, heat
generation or fire.
Perform wiring so the tension is not
applied.
If tension is applied, it may cause
disconnection, heat generation or a fire.
Do not wash this controller with water.
It may cause an electric shock or
malfunction.
Do not install this controller in a place
where an acid or alkaline solution,
special spray, etc. is used frequently.
It may cause an electric shock or
malfunction.

3
*Please confirm that in addition to this Installation Manual the following items are enclosed in the box.
No. Part name Qty.
1 Central controller 1
2 L-fitting 2
3 M3 (8mm (5/16in)) round head screw (for fixation of the fitting described in 2 above) 4
4 DIN rail attachment 2
5 M3 (6mm (1/4in)) round head screw (for fixation of the attachment described in 4 above) 8
6 Installation manual (this book) 1
7 Installation book 1
* The screws for installing to the 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 central controller
through the transmission line, must be purchased. When R410A, however, the power can be supplied also from the
R410A outdoor unit.
Unit that supplies the
power to GB-50A
The number of
connectable GB-50A Remarks
PAC-SC50KUA 2 units *1 ●When only one GB-50A 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.)
●When two GB-50A units are connected
No other system controllers can be connected.
R410A outdoor unit
(connected to the
transmission line for
central control)
1 unit Replace CN41 (power-supply switch connector) with
CN40 on only one outdoor unit.
Connectable number of indoor units will decrease by
4 units.
Outdoor unit other than
described above
(connected to
the indoor/outdoor
transmission line)
1 unit Connectable number of indoor units will decrease by
4 units.
*1: Cannot be connected to the different transmission line for central control in the different system.
* Use PAC-SC50KUA (power supply unit) when “Charge” function is used, or multiple outdoor units are connected. Connect
only the M-NET terminal (TB2) on PAC-SC50KUA to the M-NET terminal on GB-50A.
2 Confirmation of Parts

4
1. Specification
Item Contents
Interface M-NET :DC30V/24V;0.13/0.15A
External I/O :DC12V or 24V (External power supply)
Ethernet :10Base-T
Temperature Operating range 0 to 40ºC/ 32 to 104ºF
Storage range -20 to 60ºC/ -4 to 140ºF
Environmental condition
Humidity 30~90%RH (No condensation)
Dimensions 130(H) x 250(W) x 38 (D) mm/51/8(H) x97/8(W) x 11/2(D)in
Weight 1.1kg/21/2lb
Installation Environment In the control panel box (indoor)
*This unit is installed and used in a business office or equivalent environment.
2. Outline dimensions
Fig.3-1 Unit:mm(in)
L-fittings
Fig.3-2 Unit:mm(in)
38 (11/2)
250 (97/8)
3 Product Feature
Main body
POWER LAN LINK/ACT 1 2 3 4 5
6
20
(
25/32
)
10
(
25/64
)
20
(
25/32
)
130 (51/8)

5
Address setting method Address
Indoor unit Set the indoor unit you want to make them master unit in
the same group to the minimum address, and sequentially
set the indoor unit address in the same group.
1-50
Outdoor unit Min. indoor unit address in same refrigerant system + 50 51-100
BC controller/OS controller
* OS: Subsidiary Outdoor unit
Outdoor unit address in same refrigerant system + 1
However, for Sub-BC controller, minimum indoor unit
address that connects the local refrigerant piping + 50.
52-100
K control side remote controller Same address as indoor unit master unit 1-50
M-NET remote controller Set to the minimum indoor unit master address in the
same group + 100.
101-200
MA remote controller Address setting is unnecessary. -
OA processing unit/LOSSNAY After setting all the indoor units, set an arbitrary address. 1-50
K transmission converter Min. address of K control indoor unit + 200 201-250
4 System Diagram
PAR-20
/
21MAA
(
MA
)
Note
●This diagram does not show
the AC power supply wiring.
Only the configuration for the
transmission line is shown.
* Address setting for each M-NET device (The address cannot be duplicated.)
* The K transmission converter (PAC-SC25KAA) and OA processing unit (LOSSNAY) are not included in
systems shipped to North America (USA & Canada).

6
NOTE
* This system controller is designed as a main controller, not as a sub controller.
●Main system controller (main SC)
The main system controller is designed to control all units including the 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.
●Sub system controller (sub SC)
The sub system controller is designed to have its control area to be controlled by the main
system controller.
Control area of main SC
Control area of sub SC Group This system controller is designed as a main controller,
so it cannot be controlled by a main SC (such as
Gateway).
Group Group
NOTE
* The following precautions will apply when using the K transmission converter (model: PAC-SC25KAA)
and controlling the M-NET model and K control model with the same controller.
Refer to the K transmission converter installation manual for details.
1) Central controller address
Always set the controller address to “00”.
(Refertosection .)
2) Central controller function selects
Always set the No.3 function selects of the controller to "ON".
(Refertosection .)
3) Indoor unit address
Set all M-NET model indoor units from the No.1 unit, and then set the K control model addresses.
Indoor unit No.1 unit – M-NET indoor unit max. address->K control indoor unit min. address – 50.
4) K control model group No.
The min. indoor address No. of that group becomes the group No. (Same for K control side local
remote controller.)
7 Initial settin
g
7 Initial settin
g

7
1. Parts prepared at site
Please prepare the following parts before installation of the unit.
Preparation parts Specification
Unit fixing screw M4 screw x 4pcs (when using L-fittings) *1
Protective earth cable
(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 : The color combination green/yellow
Round terminal M4 screw size terminal (used for protective earth cable)
Transmission cable Type of the cable; Sheathed vinyl cords or cable which comply with the
following specifications or equivalent.
●CPEVΦ1.2mm to Φ1.6mm
●CVVS 1.25mm2to 2mm2(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
*1: When installing DIN rail, prepare 35mm(1.38inch) DIN rail. Mounting screws for DIN rail must be
also procured separately.
Applicable DIN rail types (IEC 60715/DIN 60715): TH35-7.5Fe, TH35-7.5Al
2. Allowable length of M-NET transmission lines
●Maximum length of M-NET transmission =500m/1640 ft *1
●Maximum power feeding length =200m/656 ft *1
5 Installation Method
ℓ2
ℓ3
ℓ5
ℓ6
ℓ8
ℓ7
ℓ1
ℓ
4
NOTE
* 1: Not including the remote control cables up to 10m (32 ft) in length. If the remote control
cable exceeds 10m (32 ft), the excess must be added to the total length in order to avoid
exceeding the maximum length.
Outdoo
r
unit
Example
GB-50A
Powe
r
suppl
y
unit
Outdoor
Indoor Indoor
Indoor
Indoor
Indoor Indoor
Indoor
IndoorIndoor
Remote controller
Remote controller
M-NET transmission line
(Centralized control line)
M-NET transmission line
(Indoor control line)

8
1) Maximum length of M-NET transmission
1 L2+L3+L4+ℓ1+ℓ2+ℓ3 (ℓ4) =500m/1640 ft
2 L2+L3+L4+ℓ1+ℓ5 =500m/1640 ft
3 L2+L3+L5+ℓ6+ℓ7 (ℓ8) =500m/1640 ft
4 ℓ3 (ℓ4)+ ℓ2+ℓ1+L4+L5+ℓ6+ℓ7 (ℓ8) =500m/1640 ft
5 ℓ5+ℓ1+L4+L5+ℓ6+ℓ7 (ℓ8) =500m/1640ft
2) Maximum power feeding length for the indoor control line
1 ℓ1+ℓ2+ℓ3 (ℓ4) =200m/656 ft
2 ℓ1+ℓ5 =200m/656 ft
3) Maximum power feeding length for the centralized control line
1 L1+L2 =200m/656 ft
2 L1+L3+L4 (L5) =200m/656 ft
3. Installation method
Central controller GB-50A is not waterproof.
Installation methods for the central controller GB-50A are shown below.
Method1: Horizontal installation using L-fittings
Attach two L-fittings to GB-50A using the supplied screws (Fig.5-1), then install GB-50A (Fig.5-2).
GB-50A shall be installed in a control panel box (steel: thickness 1mm (3/64 in) or more).
Please prepare the control panel box in consideration with installation space as shown in the Fig.5-2.
(Install in an area capable of withstanding a 1.1 kg (2 1/2 lb) load.)
Install GB-50A horizontally as shown in the Fig.5-2.
(Bothsides)
Fig.5-1 Fig.5-2 unit:mm(in)
Total of 4 screws 20
(
13/16
)
20
(
13/16
)
50
(
2
)
20 (13/16) *1
●L-fittings must be fixed at two points on the unit.
●The unit with L-fittings must be fixed at four points to prevent the unit from falling.
M3
M4
NOTE
If the remote control cable (ℓ4, ℓ8) do not exceed 10m (32 ft) in length, the length for ℓ4, ℓ8 may
not be considered to the total length.
CAUTION
NOTE(*1)
When connecting the protective earth cable after GB-50A is installed, leave some space for
mounting screws. When there is little space for mounting screws, connect the grounding wire before
GB-50A is installed.
290
(
11 13/32
)

9
Method2: Vertical installation using L-fittings
After removing the screws on GB-50A, attach two L-fittings to GB-50A using the supplied screws (Fig.5-3),
then install GB-50A (Fig.5-4).
GB-50A shall be installed in a control panel box (steel : thickness 1mm (3/64 in) or more).
Please prepare the control panel box in consideration with installation space as shown in the Fig.5.4.
(Install in an area capable of withstanding a 1.1 kg (2 1/2 lb) load.)
Install GB-50A vertically as shown in the Fig.5-4.
(Reference) When GB-50A is installed inside the control board, it is recommended that it be installed after
the wiring work, so that the installation becomes easy.
(Bothsides)
Fig.5-3
Fig.5-4 unit:mm(in)
Method3: Installation using DIN rail
GB-50A can be attached to DIN rail (35mm(1.38inch)).
Attach DIN rail attachment to GB-50A using the supplied screws (Fig.5-5), then install GB-50A (Fig.5-6).
GB-50A shall be installed in a control panel box (steel : thickness 1mm (3/64 in) or more).
Please prepare the control panel box in consideration with installation space as shown in the Fig.5-6.
(Install in an area capable of withstanding a 1.1 kg (2 1/2 lb) load.)
Install GB-50A vertically as shown in the Fig.5-6.
Fig.5-5 unit:mm(in)
20
(
13/16
)
20
(
3/16
)
20
(
13/16
)
20
(
13/16
)
*1
Total of 8 screws
●L-fittings must be fixed at two points on the unit.
●The unit with L-fittings must be fixed at four points to prevent the unit from falling.
M3 (6(1/4))
M3 (8(5/16))
CAUTION
Left view Rear view
M3
L-fitting
290 (11 13/32)
NOTE(*1)
When performing wiring
work after GB-50A is
installed, leave some space
for mounting screw.
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