SBD TANK TYPE HEATERS
SERVICE HANDBOOK
TROUBLESHOOTING THE EFFIKAL DAMPER (continued)
Condition:
Thermostat closed, damper is open fully
STEP 10A
TEST FOR 24VAC BETWEEN BLACK AND YELLOW
IF | THEN |
24VAC is present | This is correct – continue to Step 11 |
24VAC is not present | • See Step 9B. |
| • Check the harness plug connecting. |
| • Check that cam on shaft rotates with |
| shaft. |
| • Replace the damper board. |
| • Ensure that cam is secure against end |
| switch. |
Condition: |
|
Damper rotates continuously |
|
STEP 10B
ADJUST END SWITCH TO CAM CONTACT
IF | THEN |
Damper stops in proper position | 24 VAC should be open on a call for heat |
| and close during standby/ |
Damper does not stop in proper position | • Replace damper assembly. |
Technical Training Department | 30 |
Ashland City, TN ©2003 |
