SBD TANK TYPE HEATERS
SERVICE HANDBOOK
STEP 6
PC BOARD MOTOR TEST
Service Switch
Motor Lead |
| Motor Lead |
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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.
IF | THEN | |
24 VAC is not present: | • | Replace the Damper Drive (part # |
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| 194484) and go to step 7. The board |
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| and relay are one piece. Regardless of |
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| which part is defective, both parts |
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| should be changed. |
Voltage is present: | • | This verifies that the motor is receiving |
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| power but not closing the damper. |
| • | Replace the Damper Drive and go to |
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| 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
Technical Training Department | 23 |
Ashland City, TN ©2003 |
