State Industries SANDBLASTER SBD85 500 User Manual
Page 23
SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
22
STEP 4
INSPECT THE DAMPER
STEP 4. INSPECT THE DAMPER. Lower the thermostat setting so the unit will not be
calling for heat, then inspect the damper.
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If the damper is open:
• Go to step 5.
If the damper is closed:
• Go to step 7.
Note: If the water temperature in the tank is below 120 degrees F, temporarily disconnect the
jumper wire between the high limit and thermostat to simulate a satisfied thermostat.
STEP 5
CHECK THE PC BOARD
STEP 5. CHECK THE PC BOARD. Test for 24 VAC between the black PC board wire
connection and ground.
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24 VAC is not present:
• Check the black wire connections
between PC Board and high limit.
24 VAC is present:
• Go to step 6.
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