Service Manual

Bradford White

UPDX Series

Ultra Low NOx Power Direct Vent Gas Water

Heaters

Table of Contents

PageUPDX Service Procedure

Introduction 4 - - -

How to Use This Manual 5 - - -

Tool Required for Service 5 - - -

Specifications 6 - - -

Control Timings 8 - - -

Sequence of Operation 9 - - -

Troubleshooting 12 - - -

Burner Inspection, Cleaning and Replacement 16 I

Pilot Testing, Cleaning and Replacement 18 II

Pressure Switch Testing and Replacement 19 III

Blower Testing and Replacement 21 IV

Blower Temperature Switch Testing and Replacement 23 V

Gas Control & Thermal Well Testing & Replacement 25 VI

- Brass Well (WV4460) to Brass Well (WV4460)

(Models with serial number starting “J” or earlier)

Gas Control Replacement 29 VII

- Brass Well (WV4460) to Polymer Well (WV4462)

(Models with serial number starting “J” or earlier)

Gas Control Testing and Replacement 31 VIII

- Polymer Well (WV4462) to Polymer

Well (WV4462)

(Models with serial number starting “K” or later)

Flammable Vapor Sensor Testing & Replacement 32 IX

Safety Circuit Voltage Trace 33 X

115VAC Circuit Trace 34 XI

Dip Tube Inspection and Replacement 35 XII

Anode Inspection and Replacement 36 XIII

Flue Baffle Inspection and Replacement 39 XIV

Inner Door Removal, Inspection & Replacement 40 XV

Glossary of Terms 42 - - -

Parts List 43 - - -

Page 2