A.O. Smith
HYB-90N
warranty
Gas Piping, Sediment Traps
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
POWER VENT GAS MODELS
For Your Safety
Installation and Operating Manual
HYBRID GAS WATER HEATERS
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
COMBUSTION AIR AND VENTILATION
APPLIANCES IN UNCONFINED SPACES
APPLIANCES IN CONFINED SPACES
B. ALL AIR FROM OUTDOORS See Figures 12, 13 and
WATER PIPING
CHEMICAL VAPOR CORROSION
CLOSED WATER SYSTEMS
THERMAL EXPANSION
TEMPERATURE-PRESSURE RELIEF VALVE
HARD WATER
T&P Valve and Pipe Insulation if supplied
SEDIMENT TRAPS
GAS PIPING
GAS LINE PURGING
HIGH ALTITUDE INSTALLATIONS
FLOODING/FREEZING
FILLING THE WATER HEATER
If using 2 inch vent pipe
VENT PIPE TERMINATION
PLANNING THE VENT SYSTEM
RODENT SCREEN INSTALL INTO ELBOW GROUND LEVEL OR MAXIMUM SNOW LINE
If using 3 inch vent pipe
TERMINATION ELBOW
ELBOW STRAP
VENT TERMINAL INSTALLATION, SIDEWALL
INSTALLATION OF VENT SYSTEM
CONDENSATE
CONDENSATION WARNING
SEQUENCE OF INSTALLATIONS
INSTALLATION SEQUENCE
Vent terminals supplied with heater must be used
INSTALLATION OF VERTICAL VENT SYSTEM
INSTALLATION OF VENT SYSTEM, SIDEWALL
VENT PIPE PREPARATION
RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONS
STEP A
STEP B
STEP E
U.S. POWER VENT
STEP F
STEP G CONNECTION TO VENT PIPE
VENT HOODS MAY BE EXTREMELY HOT DURING OPERATION
CALIBRATION
ELECTRICAL CONNECTIONS
FIGURE 33a
“OFF”, “up”
DISPLAY PANEL
OPERATING INSTRUCTIONS
Numeric Display
DISCONNECTION WHEN SERVICING
CAUTION LABEL ALL WIRES PRIOR TO
CONTROLS. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGEROUS
FOR YOUR SAFETY READ BEFORE LIGHTING
LIGHTING INSTRUCTIONS
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
HEAT CYCLE DEFINITIONS
STATE
DESCRIPTION
TEMPERATURE REGULATION
Temperature Probes
UNIQUE HYBRID FEATURES
Water Circulation Pump
Line Voltage Monitor
Detection of Failure to Maintain Desired Constant Temperature
CONSTANT OUTPUT TEMPERATURE CONTROL
START UP CONDITIONS
OPERATIONAL CONDITIONS
HOUSEKEEPING
MAINTENANCE
VENTING SYSTEM INSPECTION
BURNER OPERATION AND INSPECTION
CLEANING THE INLET WATER FILTER
ANODE ROD REPLACEMENT
TEMPERATURE-PRESSURE RELIEF VALVE OPERATION
MOTORS
FLUSHING THE HEAT EXCHANGER LIME BUILD- UP
CLEANING THE HEAT ENGINE
DRAINING THE TANK
FAULT INDICATION AND ERROR CODES
Diagnostic
DIAGNOSTIC DISPLAY
Code and
Displayed
Lockout
Fault
Cause
Remedy
Lockout
Fault
Code
Description
Lockout
TROUBLESHOOTING
Check if there is any error code on
WHEN THE TAP IS OPENED
b.The unit display is an error code
system installed, or there is a
LEAKAGE CHECKPOINTS
SERVICE
PARTS IDENTIFICATION
ITEM #
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
SERVICE AND LABOR RESPONSIBILITY
LIMITED RESIDENTIAL GAS WARRANTY
CLAIM PROCEDURE
CONDITIONS AND EXCEPTIONS
Page
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500 TENNESSEE WALTZ PARKWAY ASHLAND CITY, TN PHONE 1-800-433-2545 FAX
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