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Recommended Procedures for
Discharging Capacitors
Prior to performing any service on
energized equipment, the proper
Lockout-Tagout procedures must
always be followed. Regardless of
the equipment being serviced, the
following steps must be taken:
Lockout-Tagout Steps
1. Prepare the equipment for
shutdown.
2. Shut down the equipment.
3. Disconnect any energy isolating
devices.
4. Apply the necessary lockout or
tagout devices.
5. Render safe all stored or residual
energy.
6. Verify the isolation and de-
energization of the equipment.
Personal Protective Equipment
Always wear appropriate personal
protective equipment in accordance
with applicable regulations and/or
standards to guard against potential
electrical shock and flash hazards.
WARNING
Hazardous Voltage w/
Capacitors!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power cannot be inadvertently
energized. For variable frequency
drives or other energy storing
components provided by Trane or
others, refer to the appropriate
manufacturer's literature for
allowable waiting periods for
discharge of capacitors. Verify with
an appropriate voltmeter that all
capacitors have discharged. Failure
to disconnect power and discharge
capacitors before servicing could
result in death or serious injury.
CDHF-SVN01B-EN
Electric
Information
Note: For additional information
regarding the safe discharge of
capacitors, see PROD-SVB06A-EN or
PROD-SVB06A-FR
Verifying Discharge of Capacitors
After following the proper lockout-
tagout procedure it is important to
verify that all applicable capacitors
are discharged and rendered safe.
Many capacitors in HVAC equipment
include internal bleeder circuits that
will automatically discharge the
capacitor. These circuits must be
allowed sufficient time to discharge
the capacitor prior to performing
service.
While most capacitors contained in
Trane equipment include internal
bleeder circuits, this is not always the
case and these circuits can
sometimes fail. In addition, some
bleeder circuits can take up to 30
minutes to fully discharge. It is
important to verify that the
capacitor has been fully discharged
by using a voltmeter that is rated for
the voltage of the capacitor being
tested.
WARNING
Live Electrical
Components!
During installation, testing, servicing
and troubleshooting of this product,
it may be necessary to work with
live electrical components. Have a
qualified licensed electrician or other
individual who has been properly
trained in handling live electrical
components perform these tasks.
Failure to follow all electrical safety
precautions when exposed to live
electrical components could result in
death or serious injury.
Discharging Capacitors
In the event that a capacitor does not
have an internal bleeder circuit, the
bleeder circuit has failed, or the
discharge process is not complete,
the capacitor must be discharged
properly prior to performing service.
In order to safely discharge a
capacitor, a proper capacitor
discharge tool must be used.
Screwdrivers and other hand tools
are not designed to safely discharge
capacitors. Use of these tools may
result in death or serious injury and/
or equipment damage.
49
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