Bradford-White Corp Through the wall Gas water Heaters ユーザーズマニュアル

Page 4

Introduction

The new Bradford White TTW1, TTW2 & TW4 water heaters are designed to provide reliable

performance with enhanced standard features. New design features include reliable spark to

pilot ignition system, enhanced diagnostics, simplified servicing, significantly quiet operation

and additional vent lengths.

Spark to Pilot Ignition System - employing the spark to pilot ignition system promotes

reliable and consistent pilot and main burner ignitions to provide hot water on demand.

Integrated Immersion Thermostat/Gas Control Valve 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

interior 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

Energy Factor & FHSR performance.

The TTW1, TTW2 & TW4 water heaters use a combustion system were flue gases are

combined 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

maintains 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 diagnostic LED will flash a code to positively identify an operational issue.

This service manual is designed to facilitate problem diagnosis and enhance service efficiency.

To further promote quicker service times the new gas valve can be removed and replaced

without draining the water heater. A special tool is required and will be provided with each gas

valve kit shipped from our Service Parts department.

Please read the service manual completely before attempting service on this new series of

power vent models.

pg_4.pdf 1

3/24/06 4:05:13 PM

Page 4