Installation Diagrams - A.O. Smith 650A, 740A Installation & Operation Manual

INSTALLATION DIAGRAMS

FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION
NOTE:
WHEN USING AN A.O. SMITH T-140, 200, 350 OR 400
STORAGE TANK, USE LOWER 3/4" OPENING FOR TANK TEMP. CONTROL
ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK
FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION
*PIPE TO OPEN DRAIN
ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK
INSTALL IN ACCORDANCE WITH LOCAL CODES
IF BUILDING COLD WATER SUPPLY HAS A
BACKFLOW PREVENTER, CHECK VALVE OR
WATER
PROVISIONS FOR THERMAL EXPANSION OF
WATER IN THE HOT WATER SYSTEM MUST
BE PROVIDED.
NOTE: CONNECT RETURN LINE FROM HOT
WATER RECIRCULATING LOOP (IF USED) TO
COLD WATER INLET LINE.
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 23. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
CIRCULATING PUMP WIRING DIAGRAM
14
DANGER
METER WITH CHECK VALVE,
DANGER