4
P5417009-rev.6
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Before installation is complete, make sure that the refrigerant leak test has been performed. If
refrigerant gases escape into the air, turn OFF the main switch, extinguish any open flames and
contact your service contractor. Refrigerant (Fluorocarbon) for this unit is odorless. If the refrigerant
should leak and come into contact with open flames, toxic gas could be generated. Also, because the
fluorocarbons are heavier than air, they settle to the floor, which could cause asphyxiation.
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When installing the unit, and connecting refrigerant piping, keep all piping runs as short as possible,
and make sure to securely connect the refrigerant piping before the compressor starts operating. If
the refrigerant piping is not connected and the compressor activates with the stop valve opened, the
refrigerant cycle will become subjected to extremely high pressure, which can cause an explosion or
fire.
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Tighten the flare nut with a torque wrench in the specified manner. Do not apply excessive force to the
flare nut when tightening. If you do, the flare nut can crack and refrigerant leakage may occur.
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When maintaining, relocating, and disposing of the unit, dismantle the refrigerant piping after the
compressor stops.
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When pipes are removed out from under the piping cover, after the insulation work is completed,
cover the gap between the piping cover and pipes by 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 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 will be 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
.
Electrical Precautions
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death.
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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 property
damage, serious injury, or death.
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Perform all electrical work in strict accordance with this manual and all the relevant regulatory
standards.
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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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The new air conditioner may not function normally in the following instances:
▫
If electrical power for the new air conditioner is supplied from the same transformer as the
external equipment* referred to below.
▫
If the power supply cables for this external equipment* and the new air conditioner unit are
located in close proximity to each other.
External Equipment*: (Example): A lift, container crane, rectifier for electric railway, inverter
power device, arc furnace, electric furnace, large-sized induction motor and large-sized switch.
Regarding the cases mentioned above, surge voltage may be inducted into the power supply
cables for the packaged air conditioner due to a rapid change in power consumption of the
device and an activation of a switch.
Check field regulations and standards before performing electrical work in order to protect the
power supply for the new air conditioner unit.
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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, secure properly and terminate cable shield as required 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.
