Owner manual

SBD TANK TYPE HEATERS

SERVICE HANDBOOK

Technical Training Department

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.