Table Of Contents; Hazard Definitions - A.O. Smith 400 - 2100 Installation & Operation Manual

HAZARD DEFINITIONS .................................................... 2
PLEASE READ BEFORE PROCEEDING ........................ 3
SAFETY INFORMATION ................................................... 4
THE GENESIS -- HOW IT WORKS................................ 5-7
RATINGS ........................................................................... 8
1. DETERMINE UNIT LOCATION
Location of Unit .................................................................. 9
Recommended Service Clearances .................................. 9
Non-Combustible / Combustible Flooring ........................ 10
Combustion Air Options .............................................. 10-13
2. VENTING
Before You Begin ............................................................. 14
Vent System Options ....................................................... 15
General Venting Information ............................................ 16
Conventional Negative Draft Venting .......................... 17-19
Vertical Vent/Ducted Air .............................................. 20-22
Sidewall/Power Venting .............................................. 23-25
Sidewall/Power Venting/Ducted Air .................................. 26
Direct Vent/Sealed Combustion .................................. 27-30
Outdoor Installation .......................................................... 31
3. GAS CONNECTIONS
Connecting to Gas Supply ............................................... 32
Gas Pressure Test ........................................................... 32
Checking Manifold Gas Pressure .................................... 32
Combination Gas Valves .................................................. 33
Checking Gas Supply Pressure ....................................... 34
4. WATER CONNECTIONS
Inlet & Outlet Connections ............................................... 35
Relief Valve ...................................................................... 35
Heating Unit Installations ............................................ 36-37
5. ELECTRICAL CONNECTIONS
Water Heater Operating Control Module ......................... 38
Line Voltage Connections ................................................ 39
Low Voltage Connections ................................................ 39
External EMS Connection to Terminal Strip .................... 39
Terminal Strip Connection Options ............................. 39-40
Remote Mounting of Sensor ......................................... 40

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk
levels or to important information concerning the life of the product.
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or
DANGER
serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or
WARNING
serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or
CAUTION
moderate injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
CAUTION
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but
NOTICE
not related to personal injury or property damage.
2
Contents
6. STARTUP
Check for Gas Leaks ....................................................... 41
Check Thermostat Circuit(s) ............................................ 41
Check Vent and Air Piping ............................................... 41
Placing the Water Heater in Operation ............................ 41
Start the Water Heater ..................................................... 42
If Water Heater Does Not Start Correctly ........................ 42
Set Water Heater Temperature ........................................ 42
Lighting Instructions ......................................................... 43
7. OPERATING INFORMATION
General ............................................................................. 44
User Interface ................................................................... 45
Powering Up the Control .................................................. 46
View Menus ................................................................. 47-48
Errors and Warnings ................................................... 47-49
LED Diagnostic Codes ..................................................... 50
Hot Surface Ignition System ............................................ 51
8. DOMESTIC WATER HEATERS
Initial Setup of Maximum Water Flow .............................. 52
Water Chemistry............................................................... 53
Typical Water Heater Piping w/Storage Tank(s) ......... 54-55
Multiple Water Heater Piping w/Storage Tank(s) ........ 56-57
Pump Operation ............................................................... 58
Minimum Water Temperatures (domestic hot water) ....... 59
9. MAINTENANCE.....................................................61-65
10. CONNECTION DIAGRAM .................................... 66-67
11. LADDER DIAGRAM ............................................. 68-69
12. WARRANTY ............................................................... 71
Revision Notes .................................................. Back Cover