CONTENTS
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 | 7 |
GENERAL SAFETY | 8 |
Time/Temperature Relationships in Scalds 8 | |
INSTALLATION | 9 |
Installation Codes | 9 |
Equipment Base | 9 |
Clearances | 9 |
Combustion and Ventilation Air | 11 |
Conventional Combustion | 11 |
Air Supply | |
Water Piping | 12 |
Hydronic Heating | 14 |
Domestic Hot Water Piping | 16 |
Gas Supply | 17 |
Electrical Power Connections | 19 |
Venting | 21 |
Outdoor Installation | 31 |
CONTROLS | 32 |
Ignition Control Module | 32 |
Modulating Temperature Control | 32 |
(Optional) | |
High Limit (Manual Reset) | 32 |
High Limit — Auto Reset (Optional) | 32 |
Flow Switch
High and Low Gas Pressure Switches (Optional)
Low Water Cut Off (Optional)
WIRING DIAGRAM—MODELS HD101–HD401
HD TROUBLESHOOTING PRE-START-UP
Filling
Domestic Hot Water Heaters
Inspect Venting System
INITIAL START-UP
Tools Needed
Preparation for
Main Burner Adjustment
Gas Valve Adjustment
Gas Type Conversion on Valve Safety Inspection
POST START-UP CHECK
Air Filter Inspection/Removal
Heat Exchanger Removal
MAINTENANCE
Suggested Minimum Maintenance Schedule
APPENDIX
Inside Combustion Air Contamination Important Instructions for the Commonwealth of Massachusetts
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