A.O. Smith 120 trough 500 - Manual (Page 21)

BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
20
STEP 2 HIGH LIMIT, LEFT TERMINAL TEST
STEP 2. HIGH LIMIT, LEFT TERMINAL TEST. Test for 24 VAC between the left high
limit terminal and ground.
IF THEN
The meter does not read 24 VAC: • Check wiring between transformer and
high limit.
The meter reads 24 VAC: • Go to Step 3.
Note: The high limit (Energy Cut Off) opens if the tank water temperature exceeds 205
degrees.
The control is resettable (manually) when the tank water temperature drops
below 185 degrees.