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WARNINGS 4
BEFORE INSTALLATION 5
Product Receipt 5
Model Identification 5
Ratings and Certifications 5
Installations at Elevation 5
Component Locations 6
General Information 6
GENERAL SAFETY 7
Time/Temperature Relationships in
Scalds 7
INSTALLATION 8
Installation Codes 8
Equipment Base 8
Clearances 8
Combustion and Ventilation Air 9
Conventional Combustion Air Supply 11
Water Piping 12
Hydronic Heating 14
Gas Supply 19
Electrical Power Connections 20
Field Wiring Connection 22
Venting 22
Venting Installation Tips 24
Venting Configurations 24
Outdoor Installation 29
Controls 30
Heater Sequence of Operation 36
WIRING DIAGRAMS 39
START-UP 41
Pre Start-up 41
Start-Up 42
OPERATION 45
Lighting Instructions 45
To Turn Off Gas To Appliance 46
TROUBLESHOOTING 47
UDB Fault History 48
MAINTENANCE 48
Suggested Minimum
Maintenance Schedule 48
Preventative Maintenance Schedule 49
Filter Maintenance 50
Filter Replacement 50
APPENDIX 51
Inside Air Contamination 51
IMPORTANT INSTRUCTIONS FOR
THE COMMONWEALTH OF
MASSACHUSETTS 52
WARRANTY 53
START-UP CHECKLIST 54
CONTENTS
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