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A.O. Smith
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Water Heater
A.O. Smith
HYB-90N warranty General Safety
Models:
HYB-90N
1
4
60
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Troubleshooting
Install
Error codes
Replacement Parts And Deliming Products
Warranty
Dimension
Maintenance
Caution Label All Wires Prior To
Problem
Diagnostic Display
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GENERAL SAFETY
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www.hotwater.com
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Contents
For Your Safety
POWER VENT GAS MODELS
Installation and Operating Manual
HYBRID GAS WATER HEATERS
TABLE OF CONTENTS
IMPORTANT INFORMATION
SAFE INSTALLATION, USE AND SERVICE
IMPORTANT DEFINITIONS
GENERAL SAFETY
DANGER
GENERAL SAFETY
INTRODUCTION
Page
REPLACEMENT PARTS AND DELIMING PRODUCTS
GET TO KNOW YOUR WATER HEATER - GAS MODELS
INSTALLATION CONSIDERATIONS
ROUGH IN DIMENSIONS
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
WATER PIPING - MIXING VALVE USAGE
Water Potable Heating All models are considered
FACTS TO CONSIDER ABOUT LOCATION
HANDLE INSTALLATION
DANGER
EARTHQUAKE ZONES
Access To
Screws
Screws
Top Casing Front
Screws
APPLIANCES IN UNCONFINED SPACES
COMBUSTION AIR AND VENTILATION
APPLIANCES IN CONFINED SPACES
B. ALL AIR FROM OUTDOORS See Figures 12, 13 and
CHEMICAL VAPOR CORROSION
WATER PIPING
CLOSED WATER SYSTEMS
THERMAL EXPANSION
TEMPERATURE-PRESSURE RELIEF VALVE
HARD WATER
T&P Valve and Pipe Insulation if supplied
GAS PIPING
SEDIMENT TRAPS
HIGH ALTITUDE INSTALLATIONS
GAS LINE PURGING
FLOODING/FREEZING
FILLING THE WATER HEATER
VENT PIPE TERMINATION
If using 2 inch vent pipe
PLANNING THE VENT SYSTEM
If using 3 inch vent pipe
RODENT SCREEN INSTALL INTO ELBOW GROUND LEVEL OR MAXIMUM SNOW LINE
TERMINATION ELBOW
ELBOW STRAP
INSTALLATION OF VENT SYSTEM
VENT TERMINAL INSTALLATION, SIDEWALL
CONDENSATE
CONDENSATION WARNING
INSTALLATION SEQUENCE
SEQUENCE OF INSTALLATIONS
Vent terminals supplied with heater must be used
INSTALLATION OF VENT SYSTEM, SIDEWALL
INSTALLATION OF VERTICAL VENT SYSTEM
VENT PIPE PREPARATION
STEP A
RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONS
STEP B
U.S. POWER VENT
STEP E
STEP F
STEP G CONNECTION TO VENT PIPE
VENT HOODS MAY BE EXTREMELY HOT DURING OPERATION
ELECTRICAL CONNECTIONS
CALIBRATION
FIGURE 33a
“OFF”, “up”
OPERATING INSTRUCTIONS
DISPLAY PANEL
Numeric Display
CAUTION LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGEROUS
LIGHTING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
STATE
HEAT CYCLE DEFINITIONS
DESCRIPTION
TEMPERATURE REGULATION
UNIQUE HYBRID FEATURES
Temperature Probes
Water Circulation Pump
TEMPERATURE REGULATION
Line Voltage Monitor
CONSTANT OUTPUT TEMPERATURE CONTROL
Detection of Failure to Maintain Desired Constant Temperature
START UP CONDITIONS
OPERATIONAL CONDITIONS
MAINTENANCE
HOUSEKEEPING
VENTING SYSTEM INSPECTION
BURNER OPERATION AND INSPECTION
ANODE ROD REPLACEMENT
TEMPERATURE-PRESSURE RELIEF VALVE OPERATION
CLEANING THE INLET WATER FILTER
MOTORS
CLEANING THE HEAT ENGINE
FLUSHING THE HEAT EXCHANGER LIME BUILD- UP
FAULT INDICATION AND ERROR CODES
DRAINING THE TANK
DIAGNOSTIC DISPLAY
Diagnostic
Code and
Displayed
Fault
Lockout
Cause
Remedy
Fault
Lockout
Code
Description
Fault
Lockout
Code
Description
TROUBLESHOOTING
Problem
WHEN THE TAP IS OPENED
Check if there is any error code on
b.The unit display is an error code
SERVICE
LEAKAGE CHECKPOINTS
PARTS IDENTIFICATION
ITEM #
DESCRIPTION
A Baffle, Flue B Hot Water Outlet Nipple w/ Anode, Heat Trap
AB C DEF G T SH R I Q P
REPLACEMENT PARTS DESCRIPTION
KIT #
LIMITED RESIDENTIAL GAS WARRANTY
SERVICE AND LABOR RESPONSIBILITY
CLAIM PROCEDURE
CONDITIONS AND EXCEPTIONS
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