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TABLE OF CONTENTS
WATER CHEMISTRY . . . . . . . . . . . . . . . . . . . . . . . . . .ii
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . .3
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Water Temperature Safety . . . . . . . . . . . . . . . . . . .4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Ratings and Certifications . . . . . . . . . . . . . . . . . . . .4
Model Identification . . . . . . . . . . . . . . . . . . . . . . . . .4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Outdoor Installation . . . . . . . . . . . . . . . . . . . . . . . . .5
Indoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . .6
Combustion and Ventilation Air (Indoor . . . . . . . . .7
Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Vent Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . .8
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Connections . . . . . . . . . . . . . . . . . . . . . .11
Control Adjustments - Millivolt . . . . . . . . . . . . . . . .11
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . .12
Post Start-Up Inspection . . . . . . . . . . . . . . . . . . . .15
Cold Weather Operation . . . . . . . . . . . . . . . . . . . .15
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Water Pressure Switch . . . . . . . . . . . . . . . . . . . . .16
Flame Roll-Out Safety Switch . . . . . . . . . . . . . . . .16
High Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Pilot Safety - Millivolt Models . . . . . . . . . . . . . . . .17
Burner Tray Removal . . . . . . . . . . . . . . . . . . . . . .17
Gas Valve Removal . . . . . . . . . . . . . . . . . . . . . . .18
Main Burner and Orifice Removal . . . . . . . . . . . . .18
Igniter Removal and Cleaning (Electronic) . . . . . .18
Ignition Control Fault Codes . . . . . . . . . . . . . . . . .18
Pilot Removal and Cleaning (Millivolt) . . . . . . . . .18
Heat Exchanger Removal . . . . . . . . . . . . . . . . . . .18
Tube Cleaning Procedure . . . . . . . . . . . . . . . . . . .19
Desooting Procedure . . . . . . . . . . . . . . . . . . . . . .19
Immersion Well Replacement - Millivolt . . . . . . . .19
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . .19
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . .20
Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Electronic Control Logic Flowchart . . . . . . . . . . . .22
General - Heater Will Not Fire . . . . . . . . . . . . . . .23
Illustrated Parts List . . . . . . . . . . . . . . . . . . . . . . .24
SAFETY
This appliance is to be installed and operated by trained
personnel in accordance with this Installation and Operation
Manual. Be sure to read and understand the entire
Installation and Operation Manual before attempting to install
or operate this appliance. Pay specific attention to the follow-
ing Safety section. Failure to follow these warnings could
result in a fire or explosion, causing property damage, bodily
injury, or death. Should you have any problems understand-
ing the warnings and instructions in this manual, STOP, and
get help from a qualified installer, service technician, or the
gas supplier.
SAFETY WARNINGS
DANGER
FAILURE TO INSTALL THE DRAFTHOOD ON INDOOR
INSTALLATION AND PROPERLY VENT THE HEATER TO
THE OUTDOORS AS OUTLINED IN THE VENTING SEC-
TION OF THIS MANUAL CAN RESULT IN UNSAFE OPER-
ATION OF THE HEATER. TO AVOID THE RISK OF FIRE,
EXPLOSION, OR ASPHYXIATION FROM CARBON
MONOXIDE, NEVER OPERATE THIS HEATER UNLESS IT
IS PROPERLY VENTED AND HAS AN ADEQUATE AIR
SUPPLY FOR PROPER OPERATION. BE SURE TO
INSPECT THE VENT SYSTEM FOR PROPER INSTALLA-
TION AT INITIAL START-UP; AND AT LEAST ANNUALLY
THEREAFTER. REFER TO THE VENTING SECTION OF
THIS MANUAL FOR MORE INFORMATION REGARDING
VENT SYSTEM INSPECTIONS.
WARNING
TO MINIMIZE THE POSSIBILITY OF IMPROPER OPERA-
TION, SERIOUS PERSONAL INJURY, FIRE, OR DAMAGE
TO THE HEATER:
• ALWAYS KEEP THE AREA AROUND THE HEATER
FREE OF COMBUSTIBLE MATERIALS, GASOLINE,
AND OTHER FLAMMABLE LIQUIDS AND VAPORS.
• THE HEATER SHOULD NEVER BE COVERED OR
HAVE ANYBLOCKAGE TO THE FLOW OF FRESH AIR
TO THE HEATER DURING OPERATION.
CALIFORNIA PROPOSITION 65 WARNING
THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE
STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH
DEFECTS, OR OTHER REPRODUCTIVE HARM.
WARNING
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION,
SERVICE, OR MAINTENANCE CAN CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. REFER
TO THE USER'S INFORMATION MANUAL PROVIDED
WITH THIS HEATER. INSTALLATION AND SERVICE MUST
BE PERFORMED BYA QUALIFIED INSTALLER, SERVICE
AGENCY, OR THE GAS SUPPLIER.