A.O. Smith 120 trough 500 Service Handbook page 26

GO TO PAGE 27 FOR DAMPER TESTS OF EFFIKAL EQUIPPED (SERIES 110, 111 AND
RETROFIT) MODELS
STEP 8
STEP 8. DAMPER INPUT TEST. Test for 24 VAC between the yellow wire on the PC
board and ground. Effikal – Check from orange wire to neutral
IF
24 VAC is not present:
24 VAC is present
STEP 9
STEP 9. TEST THE DAMPER . Visually check the damper blade position.
IF
The damper does NOT open fully:
The damper DOES open fully:
A.O. Smith Water Products
Irving, Texas ©2000
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
DAMPER INPUT TEST
THEN
• Check the black wire connections
between the PC board and high limit.
• Go to step 6.
TEST THE DAMPER
THEN
• Replace the damper assembly
• Go to step 10.
25
Test from
Orange
wire to
Black
(neutral)
Service Handbook
Training Department