Three eF Commercial Gas Models with Return Circulation

THREE eF COMMERCIAL GAS MODELS WITH RETURN CIRCULATION

UNION (3 PLS.) SHUT OFF VALVE (3 PLS.)

**INTAKE VENT PIPE (3 PLS.)

EXHAUST VENT PIPE (3 PLS.)

HOT WATER TEMPERATURE AND PRESSURE RELIEF VALVE (3 PLS.)

DRAIN OUTLET (3 PLS.)

DISCHARGE TUBE (3 PLS.) BACK-FLOW PREVENTER

SHUT OFF VALVE (3 PLS.)

CIRCULATOR SHUT OFF VALVE SYSTEM RETURN UNION (3 PLS.)

WATER SUPPLY

BACK-FLOW PREVENTER

THIS DRAWING SHOWS A SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES; CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS. *EXPANSION TANK RECOMMENDED TO MINIMIZE ANY PRESSURE BUILD UP IF THE WATER SUPPLY PIPING HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH A CHECK VALVE. **AIR INTAKE PIPE OPTIONAL.

SHUT OFF VALVE EXPANSION TANK* DRAIN

CONDENSATE TRAP (3 PLS.)