York HIC4008B21S Installation And Maintenance Manual page 8

Refrigerant Precautions
● As originally manufactured, this unit contains refrigerant installed by Johnson Controls. Johnson
Controls uses only refrigerants that have been approved for use in the unit's intended home country
or market. Johnson Controls distributors similarly are only authorized to provide refrigerants that
have been approved for use in the countries or markets they serve. The refrigerant used in this unit
is identified on the unit's faceplate and/or in the associated manuals. Any additions of refrigerant into
this unit must comply with the country's requirements with regard to refrigerant use and should be
obtained from Johnson Controls distributors. Use of any non-approved refrigerant substitutes will void
the warranty and will increase the potential risk of injury or death.
● If installed in a small room, take measures to prevent the refrigerant from exceeding the maximum
allowable concentration in the event that refrigerant gases should escape. The installation should
meet the requirements in ASHRAE Standards 15 and 34. If refrigerant gas has leaked during the
installation work, ventilate the room immediately.
● 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.
● 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.
● 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.
● A compressor/unit comprises a pressurized system. Never loosen threaded joints while the system is
under pressure and never open pressurized system parts.
● When maintaining, relocating, and disposing of the unit, dismantle the refrigerant piping after the
compressor stops.
Electrical Precautions
● 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.
● Before servicing, open and tag all disconnect switches. Never assume electrical power is
disconnected. Check with meter and equipment.
● Only use electrical protection equipment and tools suited for this installation.
● Use specified cables between units.
● 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.
● Use an exclusive power supply for the air conditioner at the unit's rated voltage.
● 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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To reduce the risk of serious injury or death, the following refrigerant
precautions must be followed.
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death.
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