Installation
Avtron Outdoor Resistive Load Bank • Part Number K975A 994213
3-4
1. Recirculating Airflow - If the hot, exhausted air is permitted to recirculate through the Load
Bank, it will reach such a high temperature and low density that it will no longer cool the
elements. A Load Bank should not be installed so close to any surface as to reflect the
exhausted air back to the air intake. When two or more Load Banks are being used, care
must be taken in positioning the Load Banks so that the exhausted air of one unit does not
feed the air intake of another. If a Load Bank is to be mounted on a raised structure, a shield
must be incorporated in the structure to prevent exhaust air from being drawn back under the
unit.
2. Restriction of Cooling Air - Any obstruction located within the outlined parameters listed in
the previous LOCATION section of the manual will restrict the Load Bank’s airflow. Do
not modify louvers or screens on intake and exhaust. Ducting or diverting of airflow will
increase system airflow resistance and will void the warranty. If ducting is mandatory,
obtain written approval from Avtron prior to installation. Airflow is also restricted when
two or more Load Banks have air inlets positioned close to each other. This competition for
cooling air causes a low pressure area, restricting adequate airflow.
When operating a Load Bank outdoors, the wind can work for or against the Load Bank cooling
system. If the Load Bank is positioned with the prevailing wind opposing the airflow from the
blowers, inadequate cooling may result and damage to the Load Bank can occur. Improper
positioning may also result in the air switches being deactivated, thus dropping the load.
ENCLOSURE HEATERS
Each section in the Load Bank containing control components has a 100 watt strip heater and a
temperature switch. This heater may be used to prevent problems caused by condensation.
The strip heaters are powered from an externally supplied 120 VAC, 1 PH, 60 Hz source. Refer to
the Load Bank schematic diagram 997418.
LOCAL CONTROL PANEL
The local control panel is mounted to the lower access panel covering the lower resistor assemblies
on the right side of the Load Bank (when facing the intake) and is wired to the Load Bank.
The control circuit operates from a 120V, single phase, 60 Hz, 15 amp source that is derived from
the main load bus from a 3000 VA, 480/120V control transformer.
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