A.O. Smith
HYB-90N
warranty
Troubleshooting
Install
Fault
Controls. Wiring Errors Can
Maintenance
Diagnostic Display
Access To
Door pins locked in place
Claim Procedure
Cleaning The Heat Engine
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Contents
HYBRID GAS WATER HEATERS
For Your Safety
POWER VENT GAS MODELS
Installation and Operating Manual
IMPORTANT INFORMATION
TABLE OF CONTENTS
IMPORTANT DEFINITIONS
SAFE INSTALLATION, USE AND SERVICE
GENERAL SAFETY
DANGER
INTRODUCTION
Page
GET TO KNOW YOUR WATER HEATER - GAS MODELS
REPLACEMENT PARTS AND DELIMING PRODUCTS
ROUGH IN DIMENSIONS
INSTALLATION CONSIDERATIONS
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
Water Potable Heating All models are considered
WATER PIPING - MIXING VALVE USAGE
FACTS TO CONSIDER ABOUT LOCATION
HANDLE INSTALLATION
Access To
EARTHQUAKE ZONES
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
THERMAL EXPANSION
CHEMICAL VAPOR CORROSION
WATER PIPING
CLOSED WATER SYSTEMS
TEMPERATURE-PRESSURE RELIEF VALVE
HARD WATER
T&P Valve and Pipe Insulation if supplied
SEDIMENT TRAPS
GAS PIPING
FILLING THE WATER HEATER
HIGH ALTITUDE INSTALLATIONS
GAS LINE PURGING
FLOODING/FREEZING
VENT PIPE TERMINATION
If using 2 inch vent pipe
PLANNING THE VENT SYSTEM
ELBOW STRAP
If using 3 inch vent pipe
RODENT SCREEN INSTALL INTO ELBOW GROUND LEVEL OR MAXIMUM SNOW LINE
TERMINATION ELBOW
CONDENSATION WARNING
INSTALLATION OF VENT SYSTEM
VENT TERMINAL INSTALLATION, SIDEWALL
CONDENSATE
INSTALLATION SEQUENCE
SEQUENCE OF INSTALLATIONS
Vent terminals supplied with heater must be used
INSTALLATION OF VERTICAL VENT SYSTEM
INSTALLATION OF VENT SYSTEM, SIDEWALL
VENT PIPE PREPARATION
STEP A
RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONS
STEP B
STEP G CONNECTION TO VENT PIPE
U.S. POWER VENT
STEP E
STEP F
VENT HOODS MAY BE EXTREMELY HOT DURING OPERATION
“OFF”, “up”
ELECTRICAL CONNECTIONS
CALIBRATION
FIGURE 33a
DISPLAY PANEL
OPERATING INSTRUCTIONS
Numeric Display
CAUSE IMPROPER AND DANGEROUS
CAUTION LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN
TO TURN OFF GAS TO APPLIANCE
LIGHTING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
OPERATING INSTRUCTIONS
STATE
HEAT CYCLE DEFINITIONS
DESCRIPTION
TEMPERATURE REGULATION
Temperature Probes
UNIQUE HYBRID FEATURES
Water Circulation Pump
Line Voltage Monitor
OPERATIONAL CONDITIONS
CONSTANT OUTPUT TEMPERATURE CONTROL
Detection of Failure to Maintain Desired Constant Temperature
START UP CONDITIONS
BURNER OPERATION AND INSPECTION
MAINTENANCE
HOUSEKEEPING
VENTING SYSTEM INSPECTION
MOTORS
ANODE ROD REPLACEMENT
CLEANING THE INLET WATER FILTER
TEMPERATURE-PRESSURE RELIEF VALVE OPERATION
FLUSHING THE HEAT EXCHANGER LIME BUILD- UP
CLEANING THE HEAT ENGINE
DRAINING THE TANK
FAULT INDICATION AND ERROR CODES
Displayed
DIAGNOSTIC DISPLAY
Diagnostic
Code and
Remedy
Fault
Lockout
Cause
Description
Fault
Lockout
Code
Description
TROUBLESHOOTING
system installed, or there is a
WHEN THE TAP IS OPENED
Check if there is any error code on
b.The unit display is an error code
LEAKAGE CHECKPOINTS
SERVICE
ITEM #
PARTS IDENTIFICATION
A Baffle, Flue B Hot Water Outlet Nipple w/ Anode, Heat Trap
AB C DEF G T SH R I Q P
KIT #
REPLACEMENT PARTS DESCRIPTION
CONDITIONS AND EXCEPTIONS
LIMITED RESIDENTIAL GAS WARRANTY
SERVICE AND LABOR RESPONSIBILITY
CLAIM PROCEDURE
Page
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500 TENNESSEE WALTZ PARKWAY ASHLAND CITY, TN PHONE 1-800-433-2545 FAX
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