Specifications

CONTROLLER (Feb. 2009)
CNTR-25
CONTROLLER
DATA U4
3. SYSTEM CONTROLLER
3-5-1-2-2. TB3 of Outdoor unit.
GB-50A can also receive power supply from TB3 connector of the R410A or R407C, R22 Outdoor unit. However, if the Outdoor
unit shuts down, G-50A will also automatically shuts down. Therefore, this connection is not recommended for air conditioner
system consisting multiple Outdoor units.
Indoor/outdoor transmission line
CN41
TB3
Fig.3-5-3 GB-50A, TB3 power supply
3-5-1-2-3. The effect on connectable quantity of Indoor unit when TB7 or TB3 is used to supply power to the GB-50A.
As Indoor unit controller and system controllers share the power supply from the Outdoor unit, the total power consumption of
control use needs following considerations.
In order to ensure the transmission quality in start-up of outdoor unit (or during communication traffic), the number of system controllers that connect to
indoor/outdoor transmission line in the same system, should not exceed three.
CAUTION
When applying Charge and/or Peak-cut function on GB-50A, using a Power Supply Unit (PAC-SC50KUA or PAC-SC51KUA) is recommended.
GB-50A has the ability to receive power from the one of the Outdoor units, but there is a risk that a failure of the power supply from the
Outdoor unit will cause GB-50A to shut down the whole system.
On a multiple Outdoor unit system, the connector of CN41 is changed to CN40 at only one of the Outdoor units when TB7 is used to supply
power. If that Outdoor unit fails, the connector at another unit can be changed from CN41 to CN40 to recover the power supply, but remember
to change the CN40 back to CN41 at the failed Outdoor unit.
Mitsubishi Electric Corporation is not responsible for any problems caused by the failure of the field supplied 12VDC power source.
Indoor, OA unit Indoor unit ME Remote Contr.Timers, System Contr. ON/OFF Contr.
12 0 1/4 1/2 31
Sized P06-P54 Sized P72,P96
BC controller
2
CMB
PAR-21MAA
PA C-YT51CRA(B)
PAR-FA32MA
LGH-RX-E
PAR-F27MEA
PZ-52SF
GB-50A
PA C-SF44SRA
PA C-YT34STA
G-50A
AG-150A
PA C-YT40ANRA
*RC : Remote Controller
Ta ble 3-5-1 The equivalent power consumption index by Indoor units, LOSSNAY, controllers
Transmission Booster
25
PA C-SF46EPA
Power supply unit
6
PAC-SC50KUA
5
PAC-SC51KUA
Outdoor unit
32
Connector TB3 and TB7 total *
Outdoor unit
6
Connector TB7 only
*If PAC-SC50(51)KUA is used to supply power at TB7 side, no power supply need from Outdoor unit at TB7, Connector TB3 itself will therefore have 32.
*Connector TB3 of PUMY gives equivalent power only 12. TB7 of PUMY should not be used to supply power, and power supply unit should be used.
Ta ble 3-5-2 The equivalent power supply capability index of Trans.Booster, Power supply unit, Connector TB3, TB7 of Outdoor unit.
Taking the power consumption index of Indoor unit sized P06-P54 as 1, the equivalent power consumption index and supply
capability index of others are listed at Table 3-5-1 and Ta ble 3-5-2.
With the equivalent power consumption values in Table 3-5-1 and Ta ble 3-5-2, PAC-SF46EPA can be designed into the air-
conditioner system to ensure proper system communication according to 3-5-2-A, B, C.
3-5-2-A) Firstly, count from TB3 at TB3 side the total quantity of Indoor units and ME remote controller, Timers and System controllers.
If the total quantity reaches 40, a PAC-SF46EPA should be set. In this case, Indoor unit sized P72, 96 is counted as 2 Indoor
units, but MA remote controller(s), LOSSNAY is NOT counted.
3-5-2-B) Secondly, count from TB7 side to TB3 side the total transmission power consumption index. If the total power consumption reaches 32,
a PAC-SF46EPA should be set. Yet, if a PAC-SC50(51)KUA is used to supply power at TB7 side, count from index TB3 side only.
3-5-2-C) Thirdly, count from TB7 at TB7 side the total transmission power consumption index, If the total power consumption reaches 6,
a PAC-SF46EPA should be set.
System example
Power supply unit
PAC-SC51KUA or
PAC-SC50KUA
ME remote
controller
ME remote
controller
PZ-52SF
LOSSNAY
unit
PZ-52SF
LOSSNAY
unit
Outdoor unit
(24VDC)
M-NET
0201
if the total quantity of Indoor units and ME remote controllers
reaches 40, (Indoor unit sized P72,96 is counted as 2);
or if the total equivalent transmission power consumption reaches 32.
N1
N3
N2
Transmission booster (No.1) should be used,
1.The total quantity of Indoor units and ME remote
controller should not exceed 40.
*Indoor unit sized P72,96 is counted as 2 units.
2.The total equivalent transmission power consumption
should not exceed 25.
Within N2, conditions 1,2 should be followed.
N4
Within N4, the total equivalent transmission
power consumption should not exceed 25.
TB7 TB3
TB7 TB3
if the total equivalent transmission power consumption reaches 6.
Transmission booster (No.2) should be used,
Central controller
(GB-50A)
PAC-SF46EPA
TRANSMISSION BOOSTER
3.4kg
220-240V:0.7A ~/N
WEIGHT
POWER RATING
MODEL
MADE IN JAPAN
50
UP
PAC-SF46EPA
TRANSMISSION BOOSTER
3.4kg
220-240V:0.7A ~/N
WEIGHT
POWER RATING
MODEL
MADE IN JAPAN
50
UP
Transmission
booster
PAC-SF96EPA
(No.1)
Transmission
booster
PAC-SF46EPA
(No.2)
MA RC. LOSSNAY