P5417050-rev.1
5
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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Perform all electrical work in strict accordance with this manual and all relevant regulatory
standards.
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Do not open the service cover or access panel to indoor or outdoor units without turning OFF
the main power supply. Before servicing, open and tag all disconnect switches. Never assume
electrical power is disconnected. Check with a 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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Do not run the relay wiring for the motion sensor and power supply wiring in parallel.
Electromagnetic Interference (EMI) may cause malfunction of the sensor.
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Communication cable shall be a minimum of AWG18 (0.82mm
2
), 2-Conductor, Stranded Copper.
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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The polarity of the input terminals is important, so be sure to match the polarity when using
contacts that have polarity.
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Before installing the controller or remote devices, ensure the indoor and outdoor unit operation has
been stopped. Further, be sure to wait at least five minutes before turning OFF the main power
switch to the indoor or outdoor units. Otherwise, water leakage or electrical breakdown may result.
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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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A compressor/unit comprises a pressurized system. Never loosen threaded joints while the
system is under pressure and never open pressurized system parts.
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When maintaining, relocating, or disposing of the unit, dismantle the refrigerant piping after the
compressor stops.
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When pipes are removed from under the piping cover, after the insulation work is completed,
cover the gap between the piping cover and pipes using a packing (field-supplied). If the gap is
not covered, the unit may be damaged if snow, rain water or small animals enter the unit.
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Do not apply an excessive force to the stop valve at the end of opening. Otherwise, the stop
valve flies out due to refrigerant pressure. At the test run, fully open the gas and liquid valves.
Otherwise, these devices become damaged. (It is closed before shipment.)
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If the arrangement for outdoor units is incorrect, it may cause flowback of the refrigerant and
result in failure of the outdoor unit.
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The refrigerant system may be damaged if the slope of the piping connection kit e15
o
.
Take the following precautions to reduce the risk of electric shock, fire
or explosion resulting in serious injury or death.
