Bradford White D-4-504S6FSX User Manual
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CONGRATULATIONS!
You have just purchased one of the finest water heaters on the market today!
This installation, operation and instruction manual will explain in detail the 
installation and maintenance of your new Damper Equipped Flammable Vapor 
Ignition Resistant Gas Water Heater. We strongly recommend that you 
contact a plumbing professional for the installation of this water heater. 
We require that you carefully read this manual, as well as the enclosed 
warranty, and refer to it when questions arise. If you have any specific 
questions concerning your warranty, please consult the plumbing professional 
from whom your water heater was purchased. For your records we 
recommend that you write the model, serial number and installation date of 
your water heater in the maintenance section in the back of this manual.
Special Flammable Vapor Ignition Resistant System:
This water heater is equipped with a Flammable Vapor Ignition Resistant 
System. In the event of improper usage or storage of gasoline or other 
flammable materials in the location where the water heater is installed, the 
technology will resist ignition of the flammable vapors outside the confines of 
the water heater. 
The Flammable Vapor Ignition Resistant System features:
 Advanced Flame Arrestor Design 
 Re-settable Thermal Switch to prevent burner/pilot operation with 
restricted airflow
 Flammable Vapor Sensor 
 Automatic Ignition Device 
 Sight Window to observe operation of pilot and burner 
FOR YOUR SAFETY: Activation of the Flammable Vapor Ignition Resistant 
System occurs when flammable vapors are drawn into the water heater and 
are combusted. If flammable vapors are detected: 
 Do not try to light any appliance. 
 Do not touch any electrical switch; do not use any phone in your 
building.
 Leave the premises and immediately call the fire department from a
neighbor’s phone. Follow the fire department’s instructions.
Once the flammable vapor has been evacuated, contact your plumbing 
professional or the manufacturer for further instructions. Replacement of a 
Flammable Vapor Ignition Resistant System equipped water heater due to a 
flammable vapor shutdown is not covered under the terms of the limited 
warranty.