Johnson Controls Hitachi MW-NP902A3 User Manual

4
Electrical Precautions
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resulting in serious injury or death.
Ɣ 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.
Ɣ Before servicing, open and tag all disconnect switches. Never assume electrical power is disconnected. Check
with meter and equipment.
Ɣ Only use electrical protection equipment and tools suited for this installation.
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Ɣ Communication cabling 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 cabling is applied,
proper bonding and termination of the cable shield is required as per Johnson Controls-Hitachi Air Conditioning
guidelines. Plenum and riser ratings for communication cables must be considered per application and local
code requirements.
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Ɣ Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit breaker and so
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Ɣ Clamp electrical wires securely with a cord clamp after all wiring is connected to the terminal block. In addition,
run wires securely through the wiring access channel.
Ɣ When installing the power lines, do not apply tension to the cables. Secure the suspended cables at regular
intervals, but not too tightly.
Refrigerant Precaution
To reduce the risk of serious injury or death, the following refrigerant precautions
must be followed.
Ɣ As originally manufactured, this unit contains refrigerant installed by Johnson Controls-Hitachi Air Conditioning.
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intended home country or market. Johnson Controls-Hitachi Air Conditioning distributors similarly are only
authorized to provide refrigerants that have been approved for use in the countries or markets they serve. The
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be obtained from Johnson Controls-Hitachi Air Conditioning distributors. Use of any non-approved refrigerant
substitutes will void the warranty and will increase the potential risk of injury or death.
Ɣ 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 requirements in
ASHRAE Standards 15 and 34. If refrigerant gas has leaked during the installation work, ventilate the room
immediately.
Ɣ Before installation is complete, make sure that the refrigerant leak test has been performed. If refrigerant gases
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Refrigerant (Fluorocarbon) for this unit is odorless. If the refrigerant should leak and come into contact with open
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Ɣ 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
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Ɣ A compressor/unit comprises a pressurized system. Never loosen threaded joints while the system is under
pressure and never open pressurized system parts.
Ɣ When maintaining, relocating, and disposing of the unit, dismantle the refrigerant piping after the compressor
stops.

Johnson Controls Hitachi MW-NP902A3 Specifications

General

Brand	Johnson Controls
Model	Hitachi MW-NP902A3
Category	Air Conditioner
Language	English