34 | PRODUCT DATA
Single Zone Mega W
all Mounted Engineering Manual
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ELECTRICAL CONNECTIONS
General Power Wiring / Communications Cable Guidelines
• Follow manufacturer’s circuit diagrams displayed on the inside of the control box cover.
• Have a separate power supply for the indoor units.
• Provide a circuit breaker switch between the power source and the indoor unit.
• Confirm power source specifications.
• Properly ground the outdoor unit and the indoor unit per National Electrical Code (NEC) and local codes.
• Connect the wiring firmly so that the wires cannot be easily pulled out.
• Confirm that the electrical capacity is sufficient.
• Power supply to the outdoor unit must be selected based on NEC and local codes. Maximum allowable voltage fluctuation ±10% or name-
plate rated value.
• It is recommended that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system. Add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Any openings where the field wiring enters the cabinet must be completely sealed.
Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the indoor unit in the same conduit.
Use separate conduits.
Power Wiring / Communications Cable Specifications
• Power wiring to the outdoor unit must be solid or stranded, and must comply with the applicable local and national electric codes.
• Communication / connection (power) cable from the outdoor unit to the indoor unit must be a minimum of 18 AWG, four (4) conductor,
stranded, shielded or unshielded (if shielded, must be grounded to chassis at the outdoor unit only) and must comply with applicable local
and national codes.
• Communication cable from the indoor unit to optional remote controller is to be 22 AWG, three (3) conductor, twisted, stranded, unshielded.
Wiring must comply with all applicable local and national codes.
• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation or risk electric shock,
physical injury, or death.
• Loose wiring will cause unit to malfunction, overheat, and catch fire, resulting in severe injury or death.
• Terminal screws will loosen during transport. Properly tighten the terminal connections during installation or risk equipment malfunction or
property damage.
• Loose wiring will cause unit malfunction, the wires to burnout or the terminal to overheat and catch fire. There is a risk of equipment mal-
function or property damage.
A voltage drop will cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.