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The Bradford White ECO-DEFENDER Safety System
®
The Bradford White ECO-DEFENDER Safety System was designed to resist
the ignition of flammable vapors that can occur outside of the water heater
and produce Ultra Low NOx emissions. Use and installation are nearly iden-
tical to previous versions of atmospherically fired and vented water heaters.
A number of exclusive design features are incorporated in the system that
will require additional knowledge on the part of the qualified service pro-
vider. The following information will instruct service professionals on the
function, proper diagnosis, and repair of water heaters employing the Brad-
ford White ECO-DEFENDER Safety System.
Introduction
The new Bradford White TTW ECO-DEFENDER water heaters are designed to provide reli-
able performance with enhanced standard features. New design features include reliable spark
to pilot ignition system, enhanced diagnostics, simplified servicing, quiet operation, additional
vent lengths, Bradford White ECO-DEFENDER Safety System ® and Ultra Low NOx emis-
sions.
Spark-to-Pilot Ignition System - Employing the spark-to-pilot ignition system promotes reli-
able and consistent pilot and main burner ignitions to provide hot water on demand.
Integrated Immersion Thermal Well/Gas Control with LED - Was developed for ease of
troubleshooting by providing simple diagnostic codes to pinpoint an installation or component
performance issue.
New Powerful Blower - Will eliminate problems with difficult venting situations.
Quieter and Cooler Blower Operation - Blower noise is significantly reduced for both inte-
rior and exterior environments. Cooler operation increases blower life by reducing bearing wear
and noise.
Rugged Wiring Connections - receptacle type connections promote error free wiring.
Increased Vent Lengths - Increased venting performance is achieved while maintaining En-
ergy Factor and FHSR performance.
The TTW1, TTW2 & TW4 water heaters use a combustion system were flue gases are com-
bined with dilution air to reduce the flue gas temperature in the blower. The diluted flue gases
are evacuated to the exterior through low temperature vent materials. The gas control main-
tains water temperature, ignition sequence and regulates gas flow. A safety circuit consisting of
a pressure switch and blower temperature switch verifies proper conditions exist for safe and
reliable operation. If a situation outside of normal operating parameters exists, the gas control
Introduction
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