Electric Work - Toshiba MMD-AP0071SH-C Service Manual

7
REFRIGERANT PIPING
Heat insulating process
Perform heat insulating for pipes at liquid side and gas
side separately.
In cooling time, temperature at both liquid and gas
sides becomes lower.
Therefore, perform heat insulating process sufficiently
to avoid dewing.
• For heat insulator of pipe at gas side, be sure to use
one with
heat-resisting temp.120°C or more.
• Using the attached heat insulating pipe, perform heat
insulating process
securely for pipe connecting part of the indoor units
without clearance.
8

ELECTRIC WORK

1. Using the specified wires, ensure to connect the wires, and fix wires securely so that the
external strength of the wires do not transmit to the connecting part of the terminals.
Incomplete connection or fixation may cause a fire, etc.
2. Be sure to connect earth wire. (Grounding work)
Do not connect the earth wire to gas pipe, city water pipe, lightning rod, or the earth wire of telephone.
Incomplete grounding causes an electric shock.
3. For electric work, strictly follow to the Local Regulation in each country and the Installation
Manual, and use an exclusive circuit.
Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.
Be sure to install an earth leakage breaker.
If an earth leakage breaker is not installed, an electric shock may be caused.
REQUIREMENT
• For power supply wiring, strictly conform to the Local Regulation in each country.
• For wiring of power supply of the outdoor units, follow to the Installation Manual of each outdoor unit.
• Never connect 220–240V power to the terminal blocks (A, B, U1, U2, X, Y, etc.) for control wiring.
(Otherwise, the system will be failed.)
• Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe.
The coating may melt resulted in an accident.
• After connecting wires to the terminal blocks, provide a trap and fix wires with the wire clamp.
• Store the refrigerant piping line and control wiring line in the same line.
• Do not turn on the power of the indoor unit until vacuuming of the refrigerant pipes completes.
REQUIREMENT
Apply the heat insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe.
(The pipe exposed to the outside causes water
leak.)
Using tape,
fix the heat insulator. Set notching upward.
Pipe side
(Required at the site)
Attached heat insulating pipe
WARNING
CAUTION
Power supply cord and communication wires specifications
Power supply cord and communication wires are procured locally.
For the power supply specifications, follow to the table below. If capacity is little, it is dangerous because overheat or
seizure may be caused.
For specifications of the power capacity of the outdoor unit and the power supply wires, refer to the Installation
Manual attached to the outdoor unit.
Indoor unit power supply
• For the power supply of the indoor unit, prepare the exclusive power supply separated from that of the outdoor unit.
• Arrange the power supply, earth leakage breaker, and main switch of the indoor unit connected to the same
outdoor unit so that they are commonly used.
• Power supply cord specification : Cable 3-core 2.5mm², in conformity with Design 60245 IEC 57.
Power supply
Power supply switch/Earth leakage breaker or power supply wiring/fuse rating for
Power supply
indoor units should be selected by the accummulated total current values of the indoor units.
Power supply wiring
Control wiring, Central controller wiring
• 2-core with polarity wires are used for the Control wiring between indoor unit and outdoor unit and Central
controller wiring.
• To prevent noise trouble, use 2-core shield wire.
• The length of the communication line means the total length of the inter-unit wire length between indoor and
outdoor units added with the central control system wire length.
Control wiring between indoor unit and
outdoor unit (2-core shield wire)
Communication line
Central control line wiring
(2-core shield wire)
Remote controller wiring
• 2-core with non-polarity wire is used for wiring of the remote controller wiring and group remote controllers wiring.
Remote controller wiring, remote
Twist wire: 0.5mm
controller inter-unit wiring
Total wire length of remote controller
In case of wired type only
wiring and remote controller inter-unit
In case of wireless type included
wiring = L + L1 + L2 + ... Ln
Total wire length of remote controller inter-unit wiring = L1 + L2 + ... Ln
Indoor unit Indoor unit
Remote
controller
L1
wiring
Remote
Remote controller inter-unit wiring
controller
~
220–240V 50Hz
~
220V 60Hz
Below 20m Twist wire : 2.0 mm²
Below 50m Twist wire : 3.5 mm²
(Up to 1000m) Twist wire : 1.25 mm²
Wire size
(Up to 2000m) Twist wire : 2.00
(Up to 1000m) Twist wire : 1.25 mm²
Wire size
(Up to 2000m) Twist wire : 2.00
CAUTION
2 to 2.0mm 2 × 2 The remote controller wire
(Communication line) and
AC220–240V wires cannot be
parallel to contact each other and
Up to 500m
cannot be stored in the same
Up to 400m
conduits. If doing so, a trouble
may be caused on the control
Up to 200m
system due to noise, etc.
Indoor unit Indoor unit
L2 Ln
(Max. 8 units)
mm²
mm²