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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MAX
MULTI
F
MULTI
F
ELECTRICAL WIRING
Ring Terminal
Power Wiring
Figure 50: Close up of a Typical Ring Terminal
: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.
Figure 51: Proper and Improper Power Wiring Connections
Power Wiring Specifications and Best Practices
Line Voltage Wiring and Communications Cable Installation
For both Multi F and Multi F MAX systems, line voltage is wired to the outdoor unit only. The outdoor unit will supply power to the branch
distribution units (Multi F MAX systems only) and the indoor units through the power wiring / communications cable.
Electrical Specifications
1. Multi F and Multi F MAX Outdoor Units: 1Ø, 208-230V, 60Hz
2. Indoor Units / Branch Distribution Units (Multi F MAX systems only): 1Ø, 208-230V, 60Hz from ODU (Indoor units draw minimal power.)
3.
Select power supply wire type and size based on NEC and local codes. Maximum voltage fluctuation ±10% of the nameplate rated value.
4. Properly ground the outdoor unit per NEC and / or local code.
5. Use copper wiring that is solid or stranded; must comply with all local and national electrical codes.
Power Wiring / Communications Cable Specifications
• From Multi F Outdoor Units to Indoor Units = Min. 4 x 18AWG (Stranded, shielded or unshield-
ed. If shielded, must be grounded to chassis at the outdoor unit only).
• From Multi F MAX Outdoor Units to Branch Distribution Units = Min. 4 x 18AWG (Stranded,
shielded or unshielded. If shielded, must be grounded to chassis at the outdoor unit only).
• From Multi F MAX Branch Distribution Units to Indoor Units = Min. 4 x 18AWG (Stranded,
shielded or unshielded. If shielded, must be grounded to chassis at the outdoor unit only).
Maximum Allowable Temperature for Wiring: 194°F
• Indoor Unit(s) to Wired Controller: Three-core cable
• Multi F System Maximum Cable Length: 82 ft.
• Multi F MAX System Maximum Cable Length:
- Outdoor Unit to Branch Distribution Unit(s): 180.4 ft.
- Branch Distribution Unit(s) to Indoor Unit(s): 49.2 ft.
GN/Y
L
13/16 inch
Figure 52: Power Wiring and Communica-
tions Cable from the Multi F ODU to the
IDUs, or from the Multi F MAX ODU to the
BDUs and from the BD Unit to the IDUs.
• If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.
Note:
•
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.
•
Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.
Ground the communications cable shield only at the outdoor unit. Improperly grounding this cable can cause communications
errors.
