A.O. Smith 400A - Manual (Page 30)

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ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK
FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED
SAFE TEMPERATURE AT FIXTURES. SEE WATER
TEMPERATURE CONTROL WARNING ON PAGE
3. IF HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE BOOSTER
OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
* PIPE TO OPEN DRAIN
INSTALL IN ACCORDANCE
WITH LOCAL CODES
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
NOTE: CONNECT RETURN
LINE FROM HOT WATER
CIRCULATING LOOP (IF USED)
TO COLD WATER INLET LINE.
* PIPE TO OPEN DRAIN
INSTALL IN ACCORDANCE
WITH LOCAL CODES
INSTALLATION DIAGRAMS
ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION
WITH OR WITHOUT BUILDING RECIRCULATION