97
Electrical System Installation
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Accessing the Power Wiring and
Communication Cable Connections.
Capacity of Power Supply Wiring (current)
Recommended Minimum Distance
1,2
100V or more
10A
12 inches
50A
20 inches
100A
40 inches
Exceeding 100A
60 inches
1
The figures above are based on parallel lengths up to 328 feet long. For lengths in excess of 328 feet, the distances will have to be recalculated in
direct proportion to the additional line lengths involved.
2
If the power supply waveform continues to exhibit some distortion, the space between the power wiring and communication cable should be
increased.
Table 42: Power Wire and Communications Cable Minimum Required Separation Allowable Distances.
Separating Power Wiring and Communication Cables
• Avoid running the power wiring and communication cable alongside each other; there is a strong likelihood of operation malfunction due to
electrostatic and electromagnetic interference.
Do not run both in the same conduit.
• If running the power wiring and communication cable alongside each other cannot be avoided, see the table below for minimum recom-
mended distances.
Outdoor Unit Wiring / Cable Access Holes and
Connections
1. Remove all of the screws that hold the front panel to the outdoor unit frame.
2. Detach the front panel by pulling it forward.
3. Connect the communication cable between the master and slave outdoor units
through the terminal blocks.
4. Locate the control box. For small frame outdoor units, the control box is on the right
side; for large frame outdoor units, the control box is on the left side. Remove the
control box cover to access the PCBs, the Indoor Communications PCB, and the
PI-485 PCB. Main power terminal block is located below the control box.
5. Connect the communication cable between the outdoor unit(s) and indoor units (and
heat recovery control units in systems designed for heat recovery operation only) to
the correct terminals on the outdoor unit communication terminal block. When con-
necting the communication cable between the outdoor and indoor units (and heat
recovery control units) with a shielded cable, connect the ground wire to the outdoor
unit ground terminal only.
Front Panel
•
Do not secure the power wiring and communication cables together. It may result in equipment malfunction.
•
Do not run the power wiring and the communication cable in the same conduit. It may result in equipment malfunction.
WARNING
Properly ground all outdoor units. Ground wiring must always be installed by a qualified technician. Ground wiring is required to prevent accidental
electrical shock during current leakage, which may cause bodily injury or death.
Multi V 5 outdoor units contain a temperature sensor that should not be exposed to direct sunlight. When the panel is off, cover the temperature
sensor to protect it from any direct sunlight.
ELECTRICAL
General Information
