A.O. Smith BPD-400 - Manual (Page 29)

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* PIPE RELIEF VALVE TO OPEN DRAIN.
NOTE: IF TEMPERED WATER IS
RECIRCULATED, RETURN LINE SHOULD BE
CONNECTED AT POINT “A”.
INSTALL IN ACCORDANCE WITH LOCAL
CODES.
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE
WITH OR WITHOUT BUILDING RECIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
TEMPERATURE AT FIXTURES. SEE WATER
TEMPERATURE CONTROL WARNING ON PAGE 24. IF
HIGHER PREHEAT TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN
ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO
FIXTURES.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
BACK-FLOW PREVENTER, CHECK VALVE OR WATER
METER WITH CHECK VALVE PROVISIONS FOR THERMAL
EXPANSION OF WATER IN THE HOT WATER SYSTEM
MUST BE PROVIDED.