Installation
Avtron Load Bank • Part Number K711D36027
3-3
The Load Bank must be used in a cool, well ventilated area. It must be installed where cool air is
continually available and where hot exhaust air will not be recirculated through the Load Bank. The
Load Bank must not be operated in a closed space.
The exhaust air may exceed 300
F above ambient under full load conditions. The unit must not be
installed near any equipment, wiring, or plumbing which may be damaged by high air temperatures
or which may constitute a fire hazard.
AIRFLOW CONSIDERATIONS
Even with an ample supply of cooling air, the Load Bank may overheat if it is not properly installed.
There are two types of airflow problems that should be avoided:
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.
2.
Restriction of Cooling Air - Any obstruction located within five (5) feet of the inlet and
twelve (12) feet of the exhaust hood (duct) will restrict the Load Bank's airflow. 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.
3.
The Load Banks are designed to tolerate up to 0.25" water gage additional system airflow
resistance. This includes air intake resistance (building make up air pressure) and resistance
due to exhaust duct/louvers/screen.
4.
If exhaust duct exits through motorized louvers, the design must be interlocked to assure full
open prior to operation. Consideration must also be given for louver design and actuator to
prevent heat problems.
Consult the factory if strong prevailing winds exist.
CONTROL CONNECTIONS
The control panel is supplied mounted in a 19-inch rack-type enclosure. Connect terminals of the
control panel to terminals of the Load Bank as shown on the schematic/interconnection diagram
D36028.
Control power is derived from an externally supplied 480V, 3-phase, 60 Hz power source connected
to the Load Bank terminal block TB1 terminals 19 and 20 as shown on schematic D36028.
