Avtron K975A - Energizing Control Power and Safety Tests

Installation
Avtron Outdoor Resistive Load Bank • Part Number K975A 994213
3-8
C A U T I O N
When control power is supplied by a transformer within the
Load Bank, it must be disconnected before running this
installation checkout procedure. Failure to disconnect the
control transformer may damage the Load Bank.
4. Energize the source of control power only:
A. Check the control voltage and confirm it is within 10% of the required voltage.
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W A R N I N G
Control power is present on terminal block in steps 4 through 6.
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B. Operate the safety circuitry with a jumper across the air switch contact at its
termination at the terminal block.
5. Turn on the POWER switch and verify the proper relays energize with each individual load
switch.
A. Turn on each load step individually and observe that each relay (or relays) pulls in
without chatter or hesitation.
B. Turn on all the load steps. If chatter or hesitation is observed, locate the cause of the
voltage drop causing the problem.
6. While the load relays are energized, remove the jumper across the air switch. All the load
contactors should drop out as soon as the jumper is removed. Leave the jumper off the air
switch.
7. Apply the rated fan voltage. Start blower and verify that air is exiting the resistor assembly
end.