Toshiba MMD-AP0481HF2UL Service Manual page 92

10
Electrical connection
WARNING
1. Use predefined wire and connect them certainly.
Keep the connecting terminal free from external
force.
Improper wire connection or clamping may result in
exothermic, fire or malfunction.
2. Connect ground wire. (grounding work)
Incomplete grounding cause an electric shock.
Do not connect ground wires to gas pipes, water
pipes, lightning rods or ground wires for telephone
wires.
3. Install appliance in accordance with national
wiring regulations.
Capacity shortage of circuit breaker or incomplete
installation may cause an electric shock or a fire.
CAUTION
• Consult local building codes, NEC (National Electrical
Code) or CEC (Canadian Electrical Code) for special
requirements.
• If incorrect / incomplete wiring is carried out, it will
cause an electrical fire or smoke.
• Install circuit breaker is not tripped by shock waves.
If circuit breaker is not installed, an electric shock may
be caused.
• Use the cord clamps attached to the product.
• Do not damage or scratch the conductive core and
inner insulator of power and control wires when
peeling them.
• Use the power cord and control wire of specified
thickness, type, and protective devices required.
• Do not connect 208 / 230 V power to the terminal
blocks (U1, U2, A, B etc.) for control wiring.
(Otherwise, the system will fail.)
• Perform the electric wiring so that it does not come to
contact with the high-temperature part of the pipe.
The coating may melt resulting in an accident.
• Do not turn on the circuit breaker of the indoor unit
until vacuuming of the refrigerant pipes completes.
REQUIREMENT
• For power supply wiring, strictly conform to the Local
Regulation in each country.
• Run the refrigerant piping line and control wiring line in
the same line.
23-EN
Power supply wire and
control wires specifications
Power supply wire and control wires are locally
procured.
For the power supply specifications, follow to the right
table. If capacity is little, it is dangerous because
overheat or seizure may be caused.
Indoor unit power supply
For the power supply of the indoor unit, prepare the
exclusive power supply separated from that of the
outdoor unit.
▼ Power supply
Power supply 208 / 230-1-60
Control wiring, Central control wiring
• 2-core with non-polarity wires are used for the
control wiring between indoor unit and outdoor unit
and Central control wiring.
• To prevent noise trouble, use 2-core shielded wire.
• The length of the communication line means the total
length of the control wire length between indoor and
outdoor units added with the central control wire
length.
Power supply wire
Select wire size based on the MCA.
▼ Electric characteristics
Model Power Supply
MMD-AP0481HF2UL
MMD-AP0721HF2UL 208 / 230 V-1-60 Hz
MMD-AP0961HF2UL
Control wire
Control wiring between indoor units, and outdoor unit (2-core
shielded wire)
Remote control wiring
2-core with non-polarity wire is used for wiring of the remote control wiring and group remote controls wiring.
Remote control wiring, remote control inter-unit wiring
Total wire length of remote control wiring and remote control
inter-unit wiring = L + L1 + L2 + ... Ln
Total wire length of remote control inter-unit wiring = L1 + L2 + ... Ln
Indoor unit Indoor unit
Remote
L
control
L1
wiring
Remote
Remote control inter-unit wiring
control
NOTE
• Use copper supply wire.
• Use UL wire rated 600 V for the power supply.
• Use UL wire rated 300 V for the remote control wires and control wires.
CAUTION
The remote control wire (Communication line) and AC208 / 230 V wires cannot be parallel to contact each other and
cannot be stored in the same conduits. If doing so, a trouble may be caused on the control system due to noise or other
factor.
– 12 –
MCA : Minimum Circuit Amps
MOCP : Maximum Overcurrent Protection (Amps)
Voltage Range (V) MCA
Min Max (A)
2.30
187 253 4.29
4.76
(Up to 3280'10" (1000 m)) AWG16
Wire size
(Up to 6561'8" (2000 m)) AWG14
Wire size: AWG20
In case of wired type only Up to 1640'5" (500 m)
In case of wireless type included Up to 1312'4" (400 m)
Up to 656'2" (200 m)
Indoor unit Indoor unit
L2 Ln
(Max. 8 units)
MOCP
(A)
15
15
15
EN
24-EN