WARNINGS 4
Pay Attention to These Terms 4
BEFORE INSTALLATION 5
Product Receipt 5
Model Identification 5
Ratings and Certifications 5
Installations at Elevation 5
Component Locations 6
General Information 6
Time/TemperatureRelationships
in Scalds 7
GENERAL SAFETY 7
INSTALLATION 8
Installation Codes 8
Equipment Base 8
Clearances 8
Combustion and Ventilation Air 9
Conventional Combustion Air Supply 13
Water Piping 14
Hydronic Heating 15
Domestic Hot Water 16
Combined Potable Water and Space
Heating 17
Pool Heating 17
Gas Supply 19
Electrical Power Connections 20
Field Wiring Connection 22
Venting 22
Venting Installation Tips 24
Venting Configurations 24
Outdoor Installation 29
PVC Venting Option 30
Controls 32
Heater Sequence of Operation 38
WIRING DIAGRAMS 42
Models 1005 & 1505 42
Model 2005 43
START-UP 44
Pre Start-up 44
Pre Start-up Check 44
Initial Start-up 45
Preparation 45
Start-Up 45
OPERATION 49
Lighting Instructions 49
ToTurn Off Gas ToAppliance 49
TROUBLESHOOTING 50
UDB Fault History 51
MAINTENANCE 51
Suggested Minimum
Maintenance Schedule 51
Preventive Maintenance
Schedule 52
APPENDIX 53
Inside Air Contamination 53
Important Instructions for the
Commonwealth of
Massachusetts 54
WARRANTIES 55
CONTENTS3