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Electrical Precautions
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Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and
these instructions when wiring. Improper connections and inadequate grounding can cause serious
injury or death.
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Before servicing, open and tag all disconnect switches. Never assume electrical power is disconnected.
Check with meter and equipment.
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Only use electrical protection equipment and tools suited for this installation.
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Use specified cables between units.
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Communication cable shall be a minimum of AWG18 (0.82mm
Shielded cable must be considered for applications and routing in areas of high EMI and other sources
of potentially excessive electrical noise to reduce the potential for communication errors. When shielded
cable is applied, proper bonding and termination of the cable shield is required as per Johnson Controls
guidelines. Plenum and riser ratings for communication cables must be considered per application and
local code requirements.
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Use an exclusive power supply for the air conditioner at the unit's rated voltage.
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Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit breaker
and so on), with the specified capacity. Ensure that the wiring terminals are tightened securely to
recommended torque specifications. If a circuit breaker or fuse is frequently activated, shut down the
system and contact your service contractor.
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Clamp electrical wires securely with a cable band after all wiring is connected to the terminal block. In
addition, run wires securely through the wiring access channel.
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When installing the power lines, do not apply tension to the cables. Secure the suspended cables at
regular intervals, but not too tightly.
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Make sure that the terminals do not come into contact with the surface of the electrical box. If the
terminals are too close to the surface, it may lead to failures at the terminal connection.
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Turn OFF and disconnect the unit from the power supply when handling the service connector. Do not
open the service cover or access panel to the indoor or outdoor units without turning OFF the main
power supply.
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After stopping operation, be sure to wait at least five minutes before turning off the main power switch.
Otherwise, water leakage or electrical breakdown may result. Disconnect the power supply completely
before attempting any maintenance for electrical parts. Check to ensure that no residual voltage is
present after disconnecting the power supply.
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Do not clean with, or pour water into, the controller as it could cause electric shock and/or damage the
unit. Do not use strong detergent such as a solvent. Clean with a soft cloth.
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Check that the ground wiring is securely connected. Do not connect ground wiring to gas piping, water
piping, lighting conductor, or telephone ground wiring.
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If a circuit breaker or fuse is frequently activated, shut down the system and contact your service
contractor.
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This equipment can be installed with a Ground Fault Circuit Breaker (GFCI), which is a recognized
measure for added protection to a properly grounded unit. Install appropriate sized breakers / fuses
/ overcurrent protection switches, and wiring in accordance with local, state and NEC codes and
requirements. The equipment installer is responsible for understanding and abiding by applicable codes
and requirements.
P01432Q-rev.1
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death.
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