BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
Service Handbook
Irving, Texas ©2000
Training Department
31
TROUBLESHOOTING THE EFFIKAL STYLE DAMPER (continued)
Condition:
Thermostat closed, damper is open fully
STEP A3
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 9
•
Check the harness plug connecting ----
•
Check that cam on shaft rotates with
shaft
•
Replace the damper board
Summary of Contents for 120 trough 500
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