Connect the Communication Cable for Wall-Mounted SystemsUpdated 12 minutes ago

Introduction

This article explains how to connect the communication cable for wall-mounted systems.

The 4-lead communication cable provides two power supply wires, one signal wire, and one ground wire. The wires are individually insulated and bundled together inside the outer protective jacket. These wires are also pre-fitted with U-lugs on their ends.

Communication Cable Specifications (All Models): AWG #16 x 4 Core TC-ER cable.

Notes

General Warnings

All wiring must comply with local and national electrical codes and regulations. A licensed electrician must install all the wiring.
When connecting the communication cable consult the nameplate on the system for detailed electrical specifications.
All electrical connections must be made according to the electrical connection diagrams located on the panels of the indoor and outdoor units.

Power Warnings

The power voltage must be within 90-110% of the rated voltage. Insufficient power supply can cause a malfunction, electrical shock, or fire.
Only connect the unit to an individual branch circuit. Do not connect other equipment to the same power circuit.
If there is a serious safety issue with the power supply, stop work immediately. Explain the reasoning to the client and refuse to continue the installation until the safety issue is properly resolved.

Wiring Warnings

Firmly connect every wire. Loose wiring can cause the terminal to overheat, resulting in product malfunction and possible fire.
Keep the wiring away from the copper tube, as the refrigerant circuit can become extremely hot.
Do not let wires touch or rest against the refrigerant tubing, compressor, or any moving parts.
Do not cross the electrical wiring with the signal wiring. This may cause distortion, interference, or possibly damage the circuit boards.
Do not house wires of different voltages within the same wire tube. Avoid using metal wire tubes in environments prone to acid or alkali corrosion; use plastic wire tubes instead.
Do not place wire connect joints inside the tubing. If a wire connect joint is necessary, use a connection box at the point of the joint.

Prerequisites

Turn off the main power to the system. After powering off the system, wait 10 minutes or more before touching the electrical components in order to avoid electrical shock.
Properly ground the system.
If the unit has an auxiliary electric heater, install it at least 3-feet, 3-3/8-inches (1 m) away from any combustible materials.
Install an external surge suppressor at the outdoor disconnect (recommended).
When connecting power to fixed wiring, incorporate a properly rated, HACR-type circuit breaker or current leakage protection switch. It must disconnect all poles with a contact separation of at least 1/8 inch (3 mm). Use only an approved switch or circuit breaker with a capacity of 1.5 times the unit's maximum current.

Electrical Specifications

115V Systems

The 115V systems take a single-pole breaker for the main circuit panel.

230V Systems

The 230V systems require a double-pole breaker. The tandem type will not work.

Steps

Connect the outdoor unit wires before the indoor unit wires.

Outdoor Unit Wiring

1. Unscrew and remove the electrical wiring cover that protects the terminal block on the side of the unit. A comprehensive wiring diagram is printed on the inside of the cover.

2. Connect the U-lugs to the terminals, matching the numbers with those on the terminal block. There are three terminals (1, 2, 3) and ground (G). Firmly screw each U-lug to its corresponding terminal. Strictly follow the wiring diagram inside the electrical box cover when connecting the wires.

Select different wire colors according to the relevant regulations. Ensure the wire colors for the outdoor unit and terminals match those used for the indoor unit.

Do not connect the power wire to the signal wire terminal. If power and signal wires run parallel, place them in separate conduits and maintain a distance of at least 11-3/4 inches (300 mm).

3. Secure the cable with the clamp. Ensure it is tight and does not pull on the U-lugs.

4. Reattach the cover.

Indoor Unit Wiring

1. Lift the indoor unit's front panel and remove the terminal block cover.

Select different wire colors according to the relevant regulations. Ensure the wire colors for the outdoor unit and terminals match those used for the indoor unit.

Do not connect the power wire to the signal wire terminal. If power and signal wires run parallel, place them in separate conduits and maintain a distance of at least 11-3/4 inches (300 mm).

3. Secure the cable with the clamp. Ensure it is tight and does not pull on the U-lugs.

4. Reattach the cover and close the front panel.

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