Johnson Controls (H, Engineering Manual

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Electrical Precautions
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explosion 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 Perform all electrical work in strict accordance with this installation and maintenance manual and all
the relevant regulatory standards.
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.
Ɣ Insulate a wired controller against moisture and temperature extremes.
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Ɣ The new air conditioner may not function normally in the following instances:
ƕ If electrical power for the new air conditioner is supplied from the same transformer as the device*
referred to below.
ƕ If the power source cables for this device* and the new air conditioner unit are located in close
proximity to each other.
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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.
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power supply for the new air conditioner unit.
Ɣ Communication cabling shall be a minimum of AWG18 (0.82mm
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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
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considered per application and local code requirements.
Ɣ The polarity of the input terminals is important, so be sure to match the polarity when using contacts
that have polarity.
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Ɣ 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.
Ɣ Before installing the controller or remote devices, ensure that the indoor and outdoor unit operation
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switch to the indoor or outdoor units. Otherwise, water leakage or electrical breakdown may result.
Ɣ 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. Check with a
meter and equipment.
Ɣ 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.