State Water Heaters SBD71120NE Installation Operation & Maintenance page 20

TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR
BOOSTER HEATER WITH OR WITHOUT BUILDING RECIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT
EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER
PREHEAT TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER OUTPUT,
ADD AN ANTI-SCALD VALVE FOR HOT WATER
SUPPLIED TO FIXTURES.
TWO PRE-HEATERS WITH BOOSTER HEATER
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
BACKFLOW PREVENTER, CHECK VALVE OR WATER
METER WITH CHECK VALVE, PROVISIONS FOR
THERMAL EXPANSION OF WATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.
* PIPE RELIEF VALVE TO OPEN DRAIN.
TWO PRE-HEATERS WITH MIXING VALVE
INSTALL IN ACCORDANCE WITH LOCAL CODES.
CIRCULATING RETURN LINE CONNECTIONS.
- FOR PRE-HEATED WATER LOOP, IF USED CONNECT
TO COLD WATER INLET OR PRE-HEATERS.
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