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STEP 3
High Limit (ECO)
Reset Button
Black-To
Damper Motor
STEP 3.
TO TEST HIGH LIMIT RIGHT TERMINAL. Ensure that the jumper wire
between the high limit and thermostat is connected, and the damper motor power line is
connected. Test for 24 VAC between the high limit right terminal and ground.
IF
The meter does not read 24 VAC:
The meter reads 24 VAC:
Condition
High limit open
Excessive water temperature
Heater shut down before
reaching thermostat setting
Note: The right terminal of the high limit has a jumper wire connected to the left terminal of the
thermostat. There is also a black wire connecting to the damper motor assembly. This black wire
supplies power to the motor to close the damper during periods of standby.
Technical Training Department
Ashland City, TN ©2003
SBD TANK TYPE HEATERS
SERVICE HANDBOOK
TEST HIGH LIMIT RIGHT TERMINAL
THEN
Push the reset button and redo the test (storage
water temperature below 185 degrees).
Go to step 4.
After Push in Reset - 24 VAC is now present
Reasons For Resetting
Never set on initial
installation
Faulty thermostat
Faulty high limit
Cause
Push high limit button
Replace dual control
Replace dual control
21
Temperature
Adj. Dial
High
Limit/Thermostat
Jumper Wire
Solution
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