A.O. Smith COF-199 manual Install in Accordance with Local Codes

TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER)

WITH OR WITHOUT CIRCULATION

INSET A

INSTALL THERMAL EXPANSION

TANK IN COLD WATER SUPPLY

LINE, IF CHECK VALVE OR

PRESSURE REDUCING VALVE IS

USED IN SUPPLY.

DANGER:

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURES AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

INSET B

VACUUM RELIEF VALVE

INSTALL PER LOCAL CODES.

TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER)

WITH OR WITHOUT RECIRCULATION

WIRING DIAGRAM FOR FIXTURE OR BOOSTER

LOOP (IF USED) - OTHER THAN DISHWASHER

WIRING DIAGRAM FOR 180° LOOP (IF USED)

INSTALL IN ACCORDANCE WITH LOCAL CODES

*PIPE RELIEF VALVE TO OPEN DRAIN

**140°F TO 150°F SHOULD BE MAXIMUM WATER TEMPERATURE MAINTAINED IN THE PRE-HEATERS.

120°F SHOULD BE THE MINIMUM TEMPERATURE OF WATER STORED IN THE PRE-HEATERS.

CONNECT CIRCULATING LINE FROM FIXTURES, IF USED, TO COLD WATER SUPPLY LINE OF PRE-HEATER.

CONNECT CIRCULATING LINE OF 180°F OR BOOSTED WATER, IF USED, TO INLET WATER LINE TO BOOSTER.

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