Engineering Manual

General Information
WIRING CONNECTIONS
:Copper Wire
Terminate multiple power wires of
the same gauge to both sides.
Do not terminate two wires on
one side.
Do not terminate different gauge
wires to a terminal block.
Connecting the Power Wiring / Communications Cable
Best practice dictates using ring or spade terminals to terminate power wiring at the power terminal block. If ring terminals or spade clips are
not available, then:
•
Do not terminate different gauge wires to the power terminal block. (Slack in the wiring may generate heat.)
• When terminating wires of the same thickness, follow the instructions demonstrated in the figures below.
• Firmly attach the wire; secure in a way to prevent external forces from being imparted on
the terminal block.
• Use an appropriately sized screwdriver for tightening the terminals.
•
Do not overtighten the connections; overtightening may damage the terminals.
Ring Terminal
Power Wiring
Figure 294:Multi F / Multi F MAX Outdoor and
Indoor / Branch Distribution Unit Wiring and Com-
munications Cable Diagram.
Figure 295:Close up of a Typical Ring Terminal.
Figure 296:Proper and Improper Power Wiring Connections.
• There is a risk of fire, electric shock, physical harm or injury, or death if the power wires are not properly terminated and / or firmly
attached.
• Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs may be damaged.
Always include some allowance in the wiring length when terminating. Provide some slack to facilitate removing the electrical panels while
servicing.
6/16” ± 2/16”
13/16”
GN/YL
Power Wiring, Ground
to Outdoor Unit
Power Wiring, Ground,
Communication Cable
From Outdoor Unit
To Indoor Unit or from the
Outdoor Unit to the Branch
Distribution Unit
13/16”
GN/YL
GN/YL = (Ground, Yellow)
6/16” ± 2/16”
• Multi F Systems: All power wiring / communication cable to be minimum 18 AWG from the
outdoor unit to the indoor unit, stranded, shielded or unshielded (if shielded, it must be
grounded to the chassis of the outdoor unit only), and must comply with applicable local
and national codes.
• Multi F MAX Systems: All power wiring / communication cable to be minimum 16 AWG
from the outdoor unit to the BD unit, and 18 AWG from the BD unit to the indoor unit,
stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the
outdoor unit only), and must comply with applicable local and national codes.
• For power / communication wires between the Multi F and Multi F MAX outdoor units and
the indoor units / BD units (Multi F MAX systems only), use a four (4) conductor, strand-
ed, shielded or unshielded wire. If shielded, the wire must be grounded to the chassis at
the outdoor unit only.
• Insulation material as required by local code.
• Rated for continuous exposure of temperatures up to 140°F.
• Firmly attach the cable; provide slack but secure in a way to prevent
external forces from being imparted on the terminal block.
• Wiring should be completed without splices.
General Communication Cable Specifications
Figure 297:Close up of the Indoor
Unit Terminal Block.
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WIRING CONNECTIONS | 211
Wiring Connections
MULTI
F
MAX
MULTI
F