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Cooling Fan Motor Reinstallation
1. Reinstall the four screws to secure the blower
motor assembly to the frame.
2. Reinstall the eight screws securing the top cover
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fan motor cover.
3. Reinstall the ten screws on the back panel.
FAD Board
The FAD board replaces the older version of the
monitoring cooling fan operation, which was
thermally operated. The FAD board is a small sensor
that provides speed feedback to the ERC. There are
no resistance checks available for this board, only
DC voltage checks.
• Check for DC supply voltage at the upper FAD
board.
• 5 VDC black to white.
• Blue to white is signal to control.
FAD Board Removal
Unplug the connector and remove one T10 Torx
screw that secures the board to the motor assembly.
L2 High Limit Switch
A safety thermostat is used in the event of a thermal
runaway (example: welded relay contacts). It will
open the L2 circuit to all the elements.
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