Field Wiring - Carrier 38VMA072RDS5-1 Engineering Data Book

Field Wiring

GENERAL CAUTIONS
1. Choose the correct AWG according to MCA values based on UL-1995. Follow technical standards for electrical equipment and
wiring regulations.
2. When proceeding with the wiring and connections outside, avoid anything that could damage the power line and transmission
cable, such as exposing to sunlight and rain.
3. Never squeeze bundled cables, and make sure cables do not touch non-insulated pipes or sharp edges. Be sure there are no external
pressures applied to the terminal connections.
4. Be sure there is wiring clearance for the electrical box on the outdoor units, MDC, and indoor units. These boxes are often re-
moved at the time of service work.
5. Provide designated grounding work to the outdoor unit.
6. Never connect the main power source (208/230V, 460V) to the terminal block of the communication line, or the electrical parts
will burn.
7. Use 2-core stranded shielded cable for the communication line. If communication lines of different systems are wired with the
same multiple core cable, it will cause errors.
8. Wiring for communication shall be apart from power source wiring by two inches or more to avoid electric noise from the power
source wiring. Do not insert the communication line and power source wire in the same conduit.
Outdoor
Unit
Multiple Core
Cable
Outdoor
Unit
POWER SUPPLY EXAMPLE
Multiple Core
Indoor
Cable
Unit
MDC
Indoor
Unit
Multiple Core
Indoor
Cable
Unit
MDC
Indoor
Unit
Fig. 17 —2-Core Stranded Shielded Cables
Fig. 18 —Main Power Wiring for Outdoor Unit
2-core stranded
Outdoor shielded cable
Unit
2-core stranded
Outdoor shielded cable
Unit
35
Indoor
2-core stranded
Unit
shielded cable
2-core stranded
Indoor
shielded cable Unit
Indoor
2-core stranded
Unit
shielded cable
2-core stranded
Indoor
shielded cable
Unit