1
WARNINGS................................................................2
SECTION A Before Installation ..............................3
Product Receipt .......................................................3
Model Identification................................................3
Ratings and Certifications........................................3
Installations at Elevation .........................................4
Component Locations..............................................4
General Information ................................................4
SECTION B Hot Water Supply General Safety.....5
Time/Temperature Relationships in Scalds.............6
SECTION C Installation...........................................7
Installation Codes....................................................7
Equipment Base.......................................................7
Clearances................................................................7
Combustion and Ventilation Air..............................9
Water Piping..........................................................11
Gas Supply.............................................................17
Electrical Power Connections................................19
Venting..................................................................21
Controls .................................................................28
Wiring Diagrams ...................................................38
SECTION D Start-up..............................................41
Pre Start-up............................................................41
Start-Up.................................................................42
SECTION E Operation...........................................47
Lighting Instructions .............................................47
To Turn Off Gas To Appliance .............................47
SECTION F Troubleshooting .................................49
UDB Fault History ................................................50
SECTION G Maintenance......................................51
Suggested Minimum Maintenance Schedule.........51
Preventive Maintenance Schedule.........................52
SECTION H Appendix...........................................53
Inside Air Contamination......................................53
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