Safety Considerations Avtron Model K711 Load Bank, Resistive, Duct
Mount
• Serial Number 3118 and Above
1-2
Electrical energy is transformed into heat by the resistors. This heat must be removed from the Load
Bank by the cooling blower (not part of Load Bank). If there is any restriction or stoppage of
airflow, the Load Bank may overheat and may even start a fire. It is recommended that:
1. The operator should read the manual before using the Load Bank.
2. Run an approved ground wire from the Load Bank ground lug, located inside the load
connection area to the generator frame. Run an approved ground wire from the generator
frame to a good earth ground.
3. Your unit is equipped with a temperature switch in the load element area. Do not bypass the
temperature switch to prevent nuisance tripping. The switch drops out load if insufficient air
is reaching the load elements.
4. If the unit is to be installed within existing duct work, leave enough access area to easily
remove access covers on each side of the Load Bank. Special consideration should be given
to mounting surface material, duct and devices in close proximity due to hot air exhaust.
5. Connections to ducts must be watertight in outdoor applications.
6. Maintenance personnel must always exercise caution when the access panels are removed.
Personal injury from electrical shock may resultif all sources of power are not disconnected
before servicing. Maintenance work must be done only by qualified personnel.
7. Adequate airflow in cubic ft./min. (CFM) must be maintained at all times. (Refer to the
DESCRIPTION section for minimum value of required airflow.) Failure to maintain this
airflow evenly across the resistor elements may result in element burnout. Indoor and
enclosed units may require supplemental cooling air. Full load thermal testing should be
conducted on initial run at maximum ambient to verify no cooling/thermal problems exist.
8. If duct work is vented through a screened exhaust or louvered exhaust, ensure that the
louvers (if motorized) are fully open when using the Load Bank. If exhausting through a
screened opening, check screen periodically for any blockage. Screen needs to be a
minimum 75% open area and at least as large as Load Bank core dimensions. The screen
will add additional system resistance to airflow.
9. After running a load test, residual heat may be removed from the Load Bank and
downstream duct work by allowing the blower to operate for a few minutes after load is
removed. This procedure is not required for maintaining Load Bank integrity, but it may
guard operating personnel from possible burn injuries.
10. The operator should avoid coming in contact with the resistor elements or surrounding
covers during and for some time after operation. These portions of the Load Bank become
quite hot and may result in a serious burn should contact be made with them.
