A.O. Smith 510 Outdoor Service Manual page 68

CONFIDENTIAL
510 Indoor / 510 Outdoor Service Manual
Ver. 1.00
Ceramic heating blocks
The blocks will only activate based on what the freeze protection thermostat senses. The thermostat is
located on the fan motor, close in vicinity to the inlet and outlet pipes within the 510 Indoor or 510
Outdoor. Electrical power is required for this feature to operate.
The heating blocks will activate if the thermostat senses a surrounding temperature below 36.5°F.
Once they are on, the heating blocks will only deactivate if surrounding temperatures reach above
.
46.4°F
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