A.O. Smith 120 trough 500 Service Handbook page 31

TROUBLESHOOTING THE EFFIKAL STYLE DAMPER
Condition:
Thermostat closed, damper
Wires are from left to right:
Black i Yellow i Brown i White
STEP A1
IF
24VAC is present
24VAC is not present
Condition:
Thermostat closed, damper in process of opening.
STEP A2
IF
24VAC is present
24VAC is not present
A.O. Smith Water Products
Irving, Texas ©2000
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
TEST BETWEEN BLACK (COMMON) AND BROWN
ON THE DAMPER BOARD
TEST FOR 24VAC BETWEEN BLACK AND ORANGE
30
THEN
This is correct
•
See Steps 1 thru 4
Check the harness plugs connecting heater
and damper for looseness or damage.
THEN
This is correct
•
See Step 7
•
Check the harness plug connecting
heater ----or damaged
Service Handbook
Training Department