Johnson Controls YVAHP0721CW Series, Service Manual

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SM-16007
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INSTALLATION
7.1 General Check
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wires, conduit connectors and wire terminals) have been properly selected according to the electrical
characteristics indicated in Table 7.1. Make sure that the components comply with National Electrical
Code (NEC) standards.
x
Supply electrical power to each outdoor unit. This equipment can be installed with a Ground Fault
Circuit Interrupter (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 to local, state and NEC codes and requirements. The equipment installer is responsible for
understanding and abiding by applicable codes and requirements. Failure to use a GFCI could result
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x
The power sources for the indoor unit and outdoor unit should be supplied respectively.
Connect the power supply wiring to each indoor unit group connected to the same outdoor unit.
This equipment can be installed with a Ground Fault Circuit Interrupter (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 to local, state and NEC codes and
requirements. The equipment installer is responsible for understanding and abiding by applicable
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(2) Check to ensure that the power supply voltage is within ±10% of the rated voltage.
If the power supply voltage is too low, the system cannot start due to the voltage drop.
(3) Check the size of the electrical wires.
(4) Communication cabling should 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
guidelines. Plenum and riser ratings for communication cables must be considered per application and
local code requirements.
x
In an instance where the power source for the packaged air conditioner is supplied from the same
power transformer as the device with high electricity consumption*
x
In an instance where the power supply wiring for the device* and for the packaged air conditioner are
located close to each other.
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electric furnace, large-sized induction motor, and large-sized switch.
In the instances mentioned above, an induction surge of the power supply wiring for the packaged air
conditioner could occur due to a rapid change in electricity consumption of the device and activation
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order to protect the power supply wiring for the packaged air conditioner.
(5) Check to ensure that the ground cable for the outdoor unit, and indoor unit are connected.
7.2 Electrical Wiring Connection
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breakers / fuses / overcurrent protection switches and wiring in accordance to local, state and NEC
codes and requirements. The equipment installer is responsible for understanding and abiding by
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A separate, dedicated electrical circuit must be used. If the electrical wiring work is performed
incorrectly or there is a capacity shortage of the power circuit, it will cause an electric shock or a
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to an electrical shock.
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ground cables.