Carrier TOSHIBA MMK-UP0301HP-UL Service Manual page 125

* Even if the indoor unit and the remote controller are "other than U series", the wirin
specification are the same.
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
CAUTION
• The remote controller wire (Communication line) and AC 208-230V wires cannot be parallel to
contact each other and cannot be stored in the same conduits. If doing so, a trouble may be the
caused on control system due to noise or other factor.
• If U series models (TU2C-Link) are combined with models other than U series (TCC-Link), the wirin
specifications and maximum number of connectable indoor units will be changed. Pay attentions to their
communication specifications when carrying out the installation, maintenance, or repair. For its details,
refer to the "Communication line" in 10 ELECTRICAL CONNECTION.
Indoor unit
Remote
L
control
wiring
Remote
control
Wire size: AWG20
In case of wired type only
In case of wireless type included
Indoor unit
L1 L2
Remote control inter-unit wiring
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[Communication line]
(L1+L2+L3) = Up to 6561'8" (2000 m)
L4 = Up to 328'1" (100 m)
Indoor unit
Ln
For number of max. connectable units,
refer to the following table.
Up to 1640'5" (500 m)
Up to 1312'4" (400 m)
Up to 656'2" (200 m)
Indoor unit