Pc Board - State Water Heaters SandBlaster SBD71 120 Service Handbook

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