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SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
23
STEP 6 PC BOARD MOTOR TEST
STEP 6. PC BOARD/MOTOR TEST. Check for 24 VAC between the two motor lead
terminals of the PC board. Disconnect the wires for this test.
NEHT FI
24 VAC is not present: • Replace the Damper Drive and go to
step 7. The board and relay are
one piece. Regardless of which
part is defective, both parts
should be changed.
Voltage is present: • This verifies that the motor is receiving
power but not closing the damper.
• Replace the Damper Drive and go to
step 7.
Note: The service switch may be used to bypass the damper, while waiting for a replacement part.
WARNING - In the event of damper motor failure, verify that the damper is in the "open"
position before utilizing the service switch
Service Switch
Motor Lead
Motor Lead