Carrier TOSHIBA MMK-UP0151HP-UL Service Manual page 124

<In the case of combining with outdoor units of Super Modular Multi System u series (SMMS-u)>
Uv line and Uc line (L2, L3, L4)
(2-core shield wire, non-polarity)
Uh line (L1)
(2-core shield wire, non-polarity)
• U (v, h, c) line means of control wiring.
Uv line : Between indoor and outdoor units.
Uh line : Central control line.
Uc line : Between outdoor and outdoor units.
• Uv line and Uc line are independent from another refrigerant line. Total length of Uv and Uc lines
(L3+L4) in each refrigerant line is up to 3280'10"(1000 m)
* Even if the indoor unit and the remote controller are "other than U series", the wirin
specification are the same.
<In the case of combining with outdoor units other than Super Modular Multi System u series
(SMMS-u)>
Control wiring between indoor units, and outdoor unit (L2, L3)
(2-core shield wire, non-polarity)
Central control line wiring (L1)
(2-core shield wire, non-polarity)
Control wiring between outdoor units (L4)
(2-core shield wire, non-polarity)
• The length of the communication line (L1+L2+L3) means the total length of the inter-unit wire length
between indoor and outdoor units added with the central control system wire length.
AWG20
Wire size :
AWG18 to AWG16
AWG18 to AWG16
Wire size :
AWG14
Wire size :
Wire size : AWG16 to AWG14 (Up to 328'1"(100m))
- 124 -
(Up to 1640'5" (500 m))
(Up to 3280'10" (1000 m))
(Up to 3280'10" (1000 m))
(Up to 6561'8" (2000 m))
[Uh line]
L1 = Up to 6561'8"(2000 m)
[Uv and Uc line]
L2 = Up to 3280'10" (1000 m)
(L3+L4) = Up to 3280'10" (1000 m)
AWG16 (Up to 3280'10" (1000 m))
AWG14 (Up to 6561'8"(2000 m))