Introduction - Bradford White LG2PDV50H60N Service Manual

PDV Series
The new Bradford White PDV 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, additional vent lengths, and Bradford White Defender
®
Safety System (not available on all models).
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.
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 &
FHR (not applicable on all models) performance.
The PDV water heaters use a combustion system where 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.
Please read the service manual completely before attempting service on this new series of power direct vent
models.
During normal operation, air for combustion is drawn into the water heater through the vent pipe from outside
your building. This air travels into the closed combustion chamber. The air then mixes in a normal manner
with supplied gas and it's efficiently combusted, producing low NOx emissions.
In the unlikely event trace amounts of flammable vapors are present in the area surrounding the water
heater, the sealed combustion system prevents the flammable vapors from reaching the ignition source. In
addition the flammable vapors sensor will stop the water heater from operating if a significant amount of
flammable vapors are present.
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Introduction

How the Safety System Works