User Manual

1. Safety Summary
5
Electrical Precautions
Take the following precautions to reduce the risk of electric shock, fire, or explosion
resulting in serious injury or death:
•
Only use electrical protection equipment and tools suited for this installation.
•
Insulate the wired controller against moisture and temperature extremes.
•
Use specied cables between units and the controller.
•
Communication cabling must be a minimum of 18-Gauge, 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.
•
The polarity of the input terminals is important, so be sure to match the polarity when using contacts that have polarity.
•
Highly dangerous electrical voltages may be 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 installing the controller or remote devices, ensure that the indoor and outdoor unit operation has been stopped.
Further, be sure to wait at least ve minutes before turning o the main power switch to the indoor or outdoor units.
Otherwise, water leakage or electrical breakdown may result.
•
Do not open the service cover or access panel to the indoor or outdoor units without turning OFF the main power supply. Before
connecting or servicing the controller or cables to indoor or outdoor units, open and tag all disconnect switches. Never assume
electrical power is disconnected. Verify with a meter and equipment.
•
Use an exclusive power supply at the controller’s rated voltage.
•
Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit breaker, and so forth) with the
specied capacity. Ensure that the wiring terminals are tightened securely to recommended torque specications.