York HIC4008B21S Engineering Manual page 7

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.
● Perform all electrical work in strict accordance with this installation and maintenance manual and all
the relevant regulatory standards.
● Before servicing, shut off and tag all disconnect switches. Never assume electrical power is
disconnected. Always verify with a meter.
● Only use electrical protection equipment and tools suited for this installation.
● Insulate a wired controller against moisture and temperature extremes.
● Use specified cables between units.
● The installed 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 wiring 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.
● Communication cable must be a minimum of AWG18 (0.82mm
Shielded cable must be used 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 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.
● Use a dedicated circuit for the air conditioner at the unit's rated voltage.
● 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 installing the controller or remote devices, ensure that 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.
● 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,
shut off and tag all disconnect switches. Never assume electrical power is disconnected. Always verify
with a meter.
● This equipment can be installed with a Ground Fault Circuit Breaker (GFCI), which is a recognized
measure for added protection to a properly grounded unit. Install appropriate sized breakers / fuses
/ overcurrent protection switches, and wiring in accordance with local, state and NEC codes and
requirements. The equipment installer is responsible for understanding and abiding by applicable
codes and requirements.
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Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death.
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