Johnson Controls YVAHP072B31S, Service Manual

Page: 437 / 1796

Service Manual
1-421
INSTALLATION
Electrical Precautions
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explosion resulting in serious injury or death:
Ɣ Only use electrical protection equipment and tools suited for this installation.
Ɣ Insulate the infrared (IR) receiver kit against moisture and temperature extremes.
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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 guidelines. Plenum and riser ratings for communication cables must be
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.
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 infrared (IR) receiver kit, ensure that the indoor and outdoor unit operation has
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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 Use an exclusive power supply at the controller’s rated voltage.
Ɣ Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit
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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.
Ɣ Make sure that the terminals do not come into contact with the surface of the electrical box.
If the terminals are too close to the surface, it may lead to failures at the terminal connection.
Ɣ Do not clean with, or pour water into, the infrared (IR) receiver kit as it could cause electric shock and/
or damage the unit. Do not use strong detergent such as a solvent. Clean with a soft cloth.
Ɣ Check that the ground wire is securely connected. Do not connect ground wiring to gas piping, water
piping, lighting conductor, or telephone ground wiring.