State Industries SBD85 500 - Manual (Page 28)

SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
27
NORMAL OPERATION (continued)
Condition:
•
Thermostat closed, damper in process of opening
STEP 8A TEST FOR 24VAC BETWEEN BLACK AND ORANGE
IF THEN
24VAC is present
Continue to Step 8B.
24VAC is not present See Troubleshooting Step 9B.
Condition:
•
Thermostat closed, damper fully open
STEP 8B TEST FOR 24VAC BETWEEN BLACK AND YELLOW
IF THEN
24VAC is present
Continue to Step 10A.
24VAC is not present See Troubleshooting Step 9B.