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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
Engineered Vent Systems 27
Outdoor Installation 29
Controls 30
Heater Sequence of Operation 37
WIRING DIAGRAMS 40
START-UP 42
Pre Start-up 42
Start-Up 43
OPERATION 46
Lighting Instructions 46
To Turn Off Gas To Appliance 47
UDB Fault History 47
TROUBLESHOOTING 48
MAINTENANCE 49
Suggested Minimum
Maintenance Schedule 49
Preventative Maintenance Schedule 49
Filter Maintenance 50
Filter Replacement 51
APPENDIX 51
Inside Air Contamination 51
IMPORTANT INSTRUCTIONS FOR
THE COMMONWEALTH OF
MASSACHUSETTS 52
WARRANTY 53
START-UP CHECKLIST 55
CONTENTS
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