State Industries SBD85 500 - Manual (Page 27)

SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
26
HARNESS CHART
Heater Harness Function Damper Harness
Black 24V Hot 1-Brown
Yellow 24V from Thermostat 2-Orange
Red 24V from damper 3-Yellow
White 24V common 4-Black
NORMAL OPERATION
Condition:
•
Heater on standby
•
Damper closed
•
High Limit closed
STEP 8
TEST FOR 24VAC BETWEEN BLACK (COMMON)
AND BROWN
STEP 8. TEST FOR 24VAC BETWEEN BLACK (COMMON) AND BROWN
IF THEN
24VAC is present
Continue to Step 8A.
24VAC is not present See Troubleshooting Step 9A
Wires are from left to right:
Black
i
Yellow
i
Brown
i
Orange