A.O. Smith DB/DW-720-1810 User Manual page 16

NOTES:
1. BUILDING TEMPERATURE CONTROLS SUPPLY ELECTRIC POWER TO BUILDING CIRCULATOR.
2. MAIN FLOW SWITCH PROVES MAIN WATER FLOW BEFORE ENERGIZING, SEQUENCING AND
RESETTING CONTROLS.
3. OUTDOOR THERMOSTAT REQUIRED IF BUILDING CONTROLS DO NOT PROVIDE AUTOMATIC
SHUT-DOWN OF RESET CONTROLS DURING WARM WEATHER.
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