A.O. Smith 120 trough 500 - Manual (Page 26)

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