22
McQuay IM 672-7
Electrical Installation
Electrical Installation
Wiring
•
Electrical service to the fan must correspond to the rated
voltage on the motor or electrical panel nameplate and
conform to the National Electric Code and local restrictions.
•
Connect the fan section metal frame to the building
electrical ground.
•
A door electrical interlock is not provided as standard.
•
Thermal motor protection is external to the unit. Unless the
unit is provided with a variable frequency drive (VFD) or a
unit mounted starter, thermal protection and a disconnect
switch provision per electric codes are provided by others.
•
When the unit is factory provided with a disconnect switch,
starter or a variable frequency drive (VFD), the components
are mounted on the outside of the unit cabinet. Factory
wiring is provided from the device to the unit internal motor.
•
All electrical components must be grounded to the building
central ground. Suitable ground wires and/or (bonding) lugs
are provided for all motors, disconnect switches, starters,
and variable frequency drives. Provide dedicated ground
(bonding) copper conductors in accordance with local and
national codes.
•
For units provided with a motor only or with an external
junction box, wire connections are made with suitable wire
nuts or connectors for the gauge wires provided.
•
For units provided with a disconnect switch or starter, field
wiring will be terminated to lugs. Wire size and lug torque
requirements are shown on the unit electrical schematic
provided in the component print pocket. All power supply
wire connections must be torqued as shown.
•
When the unit is provided with a VFD only, refer to the VFD
manual for wire size and torque requirements.
•
When not being serviced, close and secure electrical panel
doors to prevent ingress of moisture and airborne
contaminants.
Control Wiring
•
Access to the VFD is through the fan cabinet access door.
Provide shielded cable only as described in the provided
VFD manual. Route wire through the panel so that it does
not interfere with an other components or access doors. Do
not drill through drip pans or drain pans. Refer to the
provided VFD installation manual for detailed control
wiring instructions.
DANGER
Capacitor Hazardous Voltage!
Failure to disconnect power
and discharge capacitors before servicing will result in serious
injury or death.
Disconnect all electric power (including remote disconnects)
before servicing. Perform lockout/tagout procedures to ensure
that power can not be energized. For variable frequency drives,
or other energy storing components that have been furnished
and mounted by either McQuay, or by others, refer to the
specific manufacturer’s literature for allowable waiting periods
for discharge of capacitors. Verify capacitors have been
discharged using an appropriate voltmeter.
ADVERTISSEMENT
Voltage De Condesateur À Risquee De Danger!
À défaut de
débrancher la puissance électrique et de décharger le
condensateur avant de faire le service, il peut en résulter des
blessures sérieuses et même la mort.
Débranchez toute puissance électrique (incluant les
sectionneurs à distance) avant de faire du service. Assurez-
vous de procéder au cadenassage et à la pose d’avis assurant
que la puissance ne peut être rétablie .
Pour le variateur de fréquence variable ou tout autre
composante pouvant accumuler de l’énergie qui auraient été
fournis et installés par McQuay ou autres, se référer à la
littérature spécifique du manufacturier donnant les périodes
spécifiques d’attente nécessaires pour la décharge du
condensateur. Vérifier que le condensateur est totalement
déchargé avec les voltmètres appropriés.
CAUTION
Use copper conductors only!
Failure to use copper
conductors can result in equipment damage.
ATTENTION
Utiliser du fil de cuivre seulement. La non utilisation de fil de
cuivre peut causer des dommages à l’équipement.
