11
ELECTRICAL WIRING
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to furnace.
• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
AVERTISSEMENT:
RISQUE DE CHOC ÉLECTRIQUE,
D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité pourrait
entraîner un fonctionnement dangereux de l’appareil,
des blessures graves, la mort ou des dommages
matériels.
Un entretein incorrect pourrait entraîner un
fonctionnement dangereux de l’appareil, des blessures
graves, la mort ou des dommages matériels
• Couper toute alimentation électrique au générateur
d’air chaud avant de prodéder aux travaux d’entretein.
• Au moment de l’entretien des commandes, étiquetez
tous les fils avant de les débrancher. S’assurer de les
raccorder correctement.
• S’assurer que l’appareil fonctionne adéquatement
aprés l’entretien.
• All electrical connections must be in compliance with
all applicable local codes and ordinances, and with
the current revision of the National Electric Code
(ANSI/NFPA 70).
• For Canadian installations the electrical connections and
grounding shall comply with the current Canadian Electrical
Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist:
√
Verify the voltage, frequency, and phase of the supply source
match the specifications on the unit rating plate.
√
Verify that the service provided by the utility is sufficient to
handle the additional load imposed by this equipment. See
or the unit wiring label for proper high
and low voltage wiring.
√
Verify factory wiring is in accordance with the unit wiring
diagram. See
. Verify none of the connections loosened during
shipping or installation.
Line Voltage
• The line voltage to the unit should be supplied from a
dedicated branch circuit containing the correct fuse or circuit
breaker for the unit.
•
An electrical disconnect must be located within sight
of and readily accessible to the unit.
This switch shall be
capable of electrically de-energizing the outdoor unit. See
unit data label for proper incoming field wiring. Any other
wiring methods must be acceptable to authority having
jurisdiction.
• Use only copper wire for the line voltage power supply to this
. Use proper code agency listed
conduit and a conduit connector for connecting the supply
wires to the unit. Use of rain tight conduit is recommended.
• Provide power supply for the unit in accordance with the
unit wiring diagram and the unit rating plate.
• Overcurrent protection must be provided at the branch circuit
distribution panel and sized as shown on the unit rating
label and according to applicable local codes. See the unit
rating plate for maximum circuit ampacity and maximum
overcurrent protection limits.
• A wiring diagram is located on the inside cover of the control
access panel of the outdoor unit. The installer should become
familiar with the wiring diagram before making any electrical
connections to the outdoor unit. See
and
.
• If any of the original wires supplied with the unit must be
replaced, they must be replaced with material of the same
gauge and temperature rating.
• Units are shipped from the factory wired for 240 volt
transformer operation. For 208V operation, remove the lead
from the transformer terminal marked 240V and connect it
to the terminal marked 208V. Three phase, 460V units are
shipped wired for 460V operation.
• Internally mounted circuit breakers are available as field
installed options. These circuit breakers can be used as
an electrical disconnect.
• Connect the line-voltage leads to the terminals on the
contactor (or the circuit breaker if the field installed circuit
breaker kits are used) inside the control compartment.
Unbalanced 3-Phase Supply Voltage
Voltage unbalance occurs when the voltages of all phases of
a 3-phase power supply are no longer equal. This unbalance
reduces motor efficiency and performance. Some underlying
causes of voltage unbalance may include: Lack of symmetry in
transmission lines, large single-phase loads, and unbalanced
or overloaded transformers. A motor should never be operated
when a phase imbalance in supply is greater than 2%.
Perform the following steps to determine the percentage of
voltage imbalance:
1. Measure the line voltages of your
3-phase power supply where it
enters the building and at a location
that will only be dedicated to the
unit installation. (at the units circuit
protection or disconnect).
EXAMPLE
:
AB = 451V
BC = 460V
AC = 453V
2. Determine the average voltage in the power supply.
In this example, the measured line voltages were 451, 460,
and 453. The average would be 454 volts (451 + 460 + 453
= 1,364 / 3 = 454).
