York DHP30NWB21SDCP30NWB21SDHP36NWB21SDCP36NWB21S Service Manual page 8

● Communication cabling shall 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 guidelines. Plenum and riser ratings for communication cables must be considered per
application and local code requirments.
● Use an exclusive power supply for the air conditioner at the unit's rated voltage.
● Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit
breaker and so on), with the specified capacity. Ensure that the wiring terminals are tightened securely
to recommended torque specifications.
● Clamp electrical wires securely with a cable clamp after all wiring is connected to the terminal block.
In addition, run wires securely through the wiring access channel.
● When installing the power lines, do not apply tension to the cables. Secure the suspended cables at
regular intervals, but not too tightly.
● 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.
● Turn OFF and disconnect the unit from the power source when handling the service connector. Do not
open the service cover or access panel to the indoor or outdoor units without turning OFF the main
power supply.
● After ceasing operation, be sure to wait at least five minutes before turning off the main power
switch. Otherwise, water leakage or electrical breakdown may result. Disconnect the power source
completely before attempting any maintenance for electrical parts. Check to ensure that no residual
voltage is present after disconnecting the power source.
● Do not clean with, or pour water into, the controller 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.
● Check that the ground wire is securely connected. Do not connect ground wiring to gas piping, water
piping, lighting conductor, or telephone ground wiring.
● If a circuit breaker or fuse is frequently activated, shut down the system and contact your
service contractor.
● Perform all electrical work in accordance with this manual and in compliance with all regulations and
safety standards.
● Do not open a service access cover or panel of an indoor or outdoor unit without first turning OFF the
power at the main power supply.
● Residual voltage can cause electric shock. At all times, check for residual voltage after disconnecting
from the power source before starting work on the unit.
● 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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