Mitsubishi Electric Air-Conditioner Control System
Power supply unit
Model: PAC-SC51KUA
Installation Manual
1 Safety Precautions
WARNING Statements identify conditions or practices that could result in personal injury or loss of life.
CAUTION Statements identify conditions or practices that could result in damage to the unit or other property.
Specific Precautions
WARNING
- The unit must be installed by a dealer or technical representative. Improper installation by an unqualified person may result in electric shock and fire.
- Precisely follow the steps detailed in this manual for proper installation. Any deficiency caused by improper installation may result in an electric shock or fire.
- Install in a location that is strong enough to withstand the weight of the unit. A weak installation area may cause the unit to fall down, resulting in a personal injury.
- 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.
- All electrical work must be performed by a licensed technician, according to local regulations and the instructions detailed in this manual. Inadequate electric circuit or any deficiency caused by improper installation may result in an electric shock or fire.
- Ask your dealer or an authorized technician to move or reinstall the controller. Improper installation may result in an electric shock or fire.
- This appliance must be grounded. Make sure to install a protect PE (ground) wire. Do not connect the PE (ground) wire to gas or water pipes, lightning conductors, or telephone lines. Improper grounding may cause an electric shock.
- Make sure that the unit is powered by a dedicated line. Other appliances connected to the same line could cause an overload.
- Securely install the cover (panel) of the PAC-SC51KUA. If the cover (panel) is not installed properly, dust or water may enter the unit and may result in fire or electric shock.
- Make sure that there is a main power switch and Ground-fault interrupter. A ready accessible breaker for power source line helps reduce the risk of electric shock. Installation of a breaker is mandatory in some area.
CAUTION
- 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.
- Install so that the wires are not subjected to any tension. Tension may cause the wires to break, overheating, or fire.
- Do not wash the unit with water. Doing so may cause an electric shock or malfunction.
- Do not install in any area where the temperature could be more than 55°C (131°F) or less than -10°C (14°F). Do not expose to direct sunlight.
- Do not install in a place that has the potential for steam such as bath room or kitchen. Steam may cause an electric shock or unit malfunction.
- Do not install in any place where acidic, alkaline solution, special spray, or other substances are used. Doing so may cause an electric shock or unit malfunction.
- Use standard wires in compliance with the current capacity. A failure to do this may result in an electric leakage, overheating or fire.
- Do not touch any PCB (Printed Circuit Board) with your hand or tools. Do not allow dust to collect on the PCB. Doing so may cause fire or an electric shock.
- Use only a breaker and fuse of the specified capacity. If breaker is not installed, it may cause an electric shock. If a fuse and wire or copper wiring that has too large of a capacity is used, it may cause the unit to malfunction or fire.
2 Product features
This unit supplies DC power to the centralized controller AG-150A via the centralized controller system M-NET transmission line and DC power line. Cannot be used with G-50A.
1. Specifications
| Item | Specifications |
| Electrical requirements | Rated input voltage and current: 100-240VAC ±10%; 0.8A - 0.4A 50Hz/60Hz Single-phase Fuse: 250VAC 6.3A Time-delay type (IEC127-2 S.S.5) |
| M-NET | 23.0 - 32.0VDC |
| Output voltage/current | DC power supply: 24VDC ±5% 0 - 0.75A |
| Load capacity (24V) | Number of the loading unit: AG-150A Centralized Controller 1 unit |
| Environmental conditions | Temperature: Operating range -10 to +55°C / +14 to +131°F Storage range: -20 to +60°C / -4 to +140°F Humidity: 30~90%RH (No condensation) |
| Dimensions | 169 (H) x 271 (W) x 72 (D) mm (6-11/16 [H] x 10-11/16 [W] x 2-7/8 [D] in.) |
| Weight | 1.4 kg (3-1/8 lbs.) |
| Installation Environment | In the metal control panel or in the mounting attachment A type (PAC-YG85KTB) (sold separately) * This unit is designed for a business office or similar environment. |
2. Power supply capacity
2-1. 24V power supply (TB3)
Supplies power to one AG-150A unit. Not connectable to multiple AG-150A units. Cannot be used with G-50A.
2-2. M-NET power supply (TB2)
PAC-SC51KUA is capable to supply equivalent power up to 5 (coefficient), therefore the maximum connectable number of system controller is as follows.
Table 1 Equivalent power consumption of controllers
| Coefficient | Centralized controller AG-150A | G-50A | GB-50A | Other system controllers ON/OFF remote controller | System remote controllers (SR) Schedule timers (ST) Group remote controllers (GR) | M-NET remote controller | LOSSNAY remote controller |
| 0.5 | 1 | *1 | 3 | 1 | 0.5 | 0.25 |
*1. Cannot be used with G-50A. Use PAC-SC50KUA to connect G-50A.
Table 2 Maximum number of connectable controllers when using PAC-SC51KUA
| Centralized controller AG-150A | G-50A | GB-50A | Other system controllers ON/OFF remote controller | System remote controllers (SR) Schedule timers (ST) Group remote controllers (GR) | M-NET remote controller | LOSSNAY remote controller |
| 1 unit*2 | *1 | 1 unit*2 | 5 units | 10 units | 20 units |
*1. Cannot be used with G-50A. Use PAC-SC50KUA to connect G-50A.
*2. Either one AG-150A or one GB-50A can be connected.
Table 3 Connectable number of system controllers when 1 AG-150A is used.
| Total number of ON/OFF remote controllers (AN) | 0 | 1 | 2 | 3 | 4 | 5 | |
| Total number of System remote controllers (SR) Schedule timers (ST) Group remote controllers (GR) | 0 | V | V | V | V | V | V |
| 1 | V | V | V | V | V | V | |
| 2 | V | V | V | V | V | V | |
| 3 | V | V | V | V | V | V | |
| 4 | V | V | V | V | V | V | |
| 5 | V | V | V | V | V | V | |
| 6 | V | V | V | V | V | V | |
| 7 | V | V | V | V | V | V | |
| 8 | V | V | V | V | V | V | |
| 9 | V | V | V | V | V | V |
V: Connectable
3. External Dimensions
Diagram illustrating the external dimensions of the PAC-SC51KUA unit, showing overall height (169 mm / 6-11/16 in), width (271 mm / 10-11/16 in), and depth (72 mm / 2-7/8 in). Terminal blocks TB1, TB2, and TB3 are indicated.
3 Installation
1. Parts List
- PAC-SC51KUA: 1 unit
- L-shaped mounting brackets: 1 set
- M4 screw: 4 pieces (for attaching the PAC-SC51KUA and the mounting bracket)
- Installation Manual
2. Field-supplied Parts
| Field-supplied Parts | Specification |
| Attachment screw | M4 screw x 4 pieces For wall mounting the unit. |
| Power cable/ Ground cable | Use sheathed vinyl cord or wire. Wire type: Wire should not be lighter than standard PVC sheathed flexible cord IEC 60227 (designation 60227 IEC 53) Wire size: 0.75mm² to 2mm² (AWG18 to 14) |
| Main power switch*¹ Breaker for wiring | • Local switch: Capacity 3A, Fuse 3A* * Use B type fuse. • Molded case breaker for wiring (NFB): Capacity 3A |
| Ground-fault interrupter | Level of earth leakage: 30mA, 0.1 sec or less |
| Transmission cable | Type: Sheathed vinyl cords or cable that complies with the following specifications or equivalent. • CPEVS: Ø1.2mm to Ø1.6mm • CVVS: 1.25mm² to 2mm² (AWG16 to 14) * CPEVS: PE insulated, PVC jacketed shielded communication cable * CVVS: PVC insulated, PVC jacketed shielded control cable PE: Polyethylene PVC: Polyvinyl chloride Cable length: Please refer to section 5 M-NET Transmission Lines Length |
| DC power cable | DC power cable should comply with both local standards as well as the power requirements of the unit. Recommended type: 0.75mm² to 2mm² (AWG18 to 14) Cable length: Within 50m (164 ft) |
*1 When installing the unit, use the switch having a contact separation of at least 3mm (1/8 in) in each pole.
3. Installation area and direction
(1) To install the unit inside the metal control panel:
Attach the mounting brackets to PAC-SC51KUA as shown in Fig. 3-1. The PAC-SC51KUA Power supply unit is not waterproof. PAC-SC51KUA shall be installed in a metal control panel box (steel: thickness 1mm (1/16 in.) or more). Follow the installation requirements as shown in Fig. 3-1. (Install in an area capable of withstanding a 1.4 kg (3-1/8 lbs.) load.) Only install the unit vertically as indicated by the arrow on the cover shown in Fig. 3-1.
Diagram (Fig. 3-1) shows the unit with mounting brackets attached, indicating the correct vertical orientation with an arrow and providing dimensions for bracket placement.
(2) To install the unit inside the mounting attachment A type (PAC-YG85KTB) (sold separately). PAC-SC51KUA can be installed inside the mounting attachment A type (PAC-YG85KTB) (sold separately). Refer to the AG-150A Installation Manual for details.
4. Unit installation
Attach the unit to the metal control panel box using M4 screws as shown in Fig. 3-2. The unit should be attached on all four corners to prevent it falling down.
Diagram (Fig. 3-2) illustrates attaching the PAC-SC51KUA unit to a control panel using M4 screws (accessories and field-supplied), ensuring it is secured on all four corners.
Refer to the AG-150A Installation Manual for instructions on how to install the unit inside the mounting attachment A type (PAC-YG85KTB) (sold separately).
4 Wiring
WARNING All electric work must be performed according to local regulations. Improper electrical work may result in electric shock or fire. Be sure to shut off the power source of this unit and all other connected units before wiring.
CAUTION Do not connect the AC power line to the M-NET and POWER (24VDC) terminal blocks of this device; otherwise, the unit may fail.
1. Cover Removal and Installation
Remove the three mounting screws and the cover. Attach the cover to the unit by tightening the three screws indicated in Figure 4-1.
Diagram (Fig. 4-1) shows the removal and reattachment of the unit's cover using three screws.
2. Power line
Wire the power and ground cables to L/L1, N/L2 and the ground cable terminals on TB1 as shown in Fig. 4-2.
Diagram (Fig. 4-2) details the wiring of power and ground cables to terminal block TB1. It includes connections for a breaker for wiring and a ground-fault interrupter, specifying connections for EU (L/N) and US (L1/L2) power sources and ground terminals.
Notes: *1 Install ground-fault interrupter and breaker for wiring on the power supply. *2 Do not use anything other than a breaker and fuse with the correct capacity. Using a fuse or wire of too large capacity may cause malfunction or fire. *3 Note: When installing the unit, use the switch having a contact separation of at least 3mm (1/8 in.) in each pole. Use L/N in EU. Use L1/L2 in the U.S. Use a ring terminal to connect to the terminal block.
3. DC Power Supply and M-NET Transmission Line
3-1. When connecting to the centralized controller (AG-150A)
(1) Without the use of an expansion controller (PAC-YG50ECA)
(a) Connected via the terminal block:
The DC power cable and M-NET transmission line connect as shown in Fig. 4-3. The DC power cable has a 24VDC and a GND polarity. Connect it to the terminals in accordance with the polarity. Connect the M-NET transmission line to the A, B (non-polarity), and S (shield) terminal block.
Diagram (Fig. 4-3) shows the connection of DC power supply and M-NET transmission lines between the AG-150A centralized controller and the PAC-SC51KUA power supply unit via terminal blocks. It indicates polarity for DC power and connections for M-NET lines (A, B, S).
(b) Connecting the connector:
When installing the unit in the mounting attachment A type (PAC-YG85KTB) (sold separately), DC power cable and M-NET transmission line can be connected with the connector as shown in the Fig. 4-4. Connectable to the connector using the cable that is supplied with AG-150A (Refer to the Installation Manual that came with AG-150A for details.)
Diagram (Fig. 4-4) illustrates the connection of DC power supply and M-NET transmission lines between the AG-150A centralized controller and the PAC-SC51KUA power supply unit using connectors.
CAUTION Both of PAC-SC51KUA and Outdoor unit can supply DC power to the M-NET transmission line. Set the outdoor unit central control system transmission line power supply to the factory setting CN41 (no supply). For further details, refer to the outdoor unit installation manual. Failure to do so may cause unit malfunction or fire. After connection for the each cable, fasten each cable with the cable fixture.
(2) With the use of an expansion controller (PAC-YG50ECA): Only connect the DC power cable. (Use only TB3 or CN2.)
(a) Connected via the terminal block (TB3):
Diagram (Fig. 4-5) shows DC power supply connections via terminal block TB3 between the AG-150A controller, PAC-YG50ECA expansion controller, and PAC-SC51KUA power supply unit.
(b) Connecting the connector (CN2):
Diagram (Fig. 4-6) illustrates DC power supply connections via connector CN2 between the AG-150A controller and the PAC-SC51KUA power supply unit.
After connection for the each cable, fasten each cable with the cable fixture.
3-2. When not connecting to the centralized controller (AG-150A)
Only use the M-NET output (TB2 or CN1).
CAUTION The 24 VDC power supply is for exclusive use with the centralized controller (AG-150A).
5 M-NET Transmission Lines Length
Maximum length of M-NET transmission: ≤500m (1640 ft) *1
Maximum power feeding length: ≤200m (656 ft)
NOTE *1: If the remote control cable exceeds 10m (32 ft), the additional length must be added to the total in order to avoid exceeding the maximum length of the M-NET transmission specification.
Example
Diagram illustrating various M-NET transmission line configurations and lengths for connecting multiple outdoor and indoor units to a centralized controller and power supply unit. It shows line segments (L1, L2, L3, L4, l1-l8) with maximum allowed lengths for transmission and power feeding.
1) Maximum length of M-NET transmission line:
- ① L1+L2+L3+l5+l1+l2 (l3): ≤500m (1640 ft)
- ② L1+L2+L3+l5+l4: ≤500m (1640 ft)
- ③ L1+L2+L4+l6+l7 (l8): ≤500m (1640 ft)
- ④ l2 (l3)+l1+l5+L3+L4+l6+l7 (l8): ≤500m (1640 ft)
- ⑤ l4+l5+L3+L4+l6+l7 (l8): ≤500m (1640 ft)
2) Maximum power feeding length for the indoor control line:
- ① l5+l1+l2 (l3): ≤200m (656 ft)
- ② l5+l4: ≤200m (656 ft)
- ③ l6+l7 (l8): ≤200m (656 ft)
3) Maximum power feeding length for the centralized control line:
- ① L1: ≤200m (656 ft)*
- ② L2 +L3 (L4): ≤200m (656 ft)
* To supply power to the M-NET line from PAC-SC51KUA, connect the power jumper on outdoor unit to CN41.
Diagram showing outdoor unit jumper settings (CN40, CN41).
NOTE If the remote control cable (l3, l8) does not exceed 10m (32 ft) in length, the length for l3, l8 may not need to be added to the total length.
*The total length of DC power cable must not exceed 50m (164 ft).
NOTE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Compliance and Contact Information
This product is designed and intended for use in the residential, commercial and light-industrial environment.
The product at hand is based on the following EU regulations:
- Low Voltage Directive 2006/95/EC
- Electromagnetic Compatibility Directive, 2004/108/EC
Please be sure to put the contact address/telephone number on this manual before handing it to the customer.
MITSUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Authorized representative in EU: MITSUBISHI ELECTRIC EUROPE B.V.
HARMAN HOUSE, 1 GEORGE STREET, UXBRIDGE, MIDDLESEX UB8 1QQ, U.K.
Document Number: WT05372X04. Printed in Japan. Recycled Paper.
