Multi F Engineering Manual

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Table Of Contents

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ELECTRICAL CONNECTIONS

Figure 45: Typical Multi F System General Power / Communications

System Schematic.

Figure 46: Typical Multi F MAX System General Power / Communica-

tions System Schematic.

Power Supply

Circuit Breaker

Indoor Unit

Branch Distribution Unit

Ground Wiring

Outdoor Unit

Branch Distribution Unit

Indoor Units

Power Supply

Circuit Breaker

Ground Wiring

Outdoor Unit

Communication / Connection (Power) Cable Specifications

Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. Ground the communica-

tions cable shield only at the outdoor unit. Improperly grounding this cable can cause communications errors.

• Use a conduit for the communications / connection (power) cable from the outdoor unit to the indoor units and branch distribution unit(s).

Electrical interference my cause product malfunction.

• The communications / connection (power) cable from the outdoor unit to the indoor units / branch distribution unit(s) must be separated and

isolated from power wiring to the outdoor unit, computers, radio and television broadcasting facilities, as well as medical imaging equip-

ment. Electrical interference my cause product malfunction.

Figure 47: Typical Multi F / Multi F MAX Outdoor

and Indoor / Branch Distribution Unit Wiring and

Communications Cable Diagram.

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)

7/16" ± 1/8"

• 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 must be completed without splices.

Multi F Systems:

• Communication / connection (power) cable from the outdoor unit to the indoor unit must

use a minimum of 14 AWG, four (4) conductor, 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.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for

lengths up to the published maximum pipe length, plus recommended slack at both ends.

Multi F MAX Systems:

• All communication / connection (power) cable from the outdoor unit to the branch distribution unit(s) must be a minimum of 14 AWG, four (4)

conductor, 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.

• Communication / connection (power) cable from the branch distribution unit(s) to the indoor units must use a minimum of 14 AWG, four (4)

conductor, 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.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for lengths up to the published maximum pipe length,

plus recommended slack at both ends.

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56 | ELECTRICAL CONNECTIONS

Multi F and Multi F MAX Heat Pump System Engineering Manual

MULTI

MAX

MULTI