A.O. Smith VB/VW- 1000, VB/VW- 750

WIRING DIAGRAM

Contents

Main INSTRUCTION MANUAL MODELS: VB/VW-500, 750 AND 1000 SERIES 200/201 Installation Operation Maintenance Limited Warranty SAFE INSTALLATION, USE AND SERVICE WARNING CAUTION CAUTION DANGER IMPORTANT DEFINITIONS Page DIMENSION AND CAPACITY DATA CAPACITY AND FLOW DATA CONTENTS INTRODUCTION GROUNDING INSTRUCTIONS INLET WATER CONSIDERATIONS CORRECT GAS PRECAUTIONS LIQUEFIED PETROLEUM GAS MODELS CONTROL COMPONENTS THE CONTROL SYSTEM HOT SURFACE IGNITER PRESSURE SWITCHES LOW GAS SWITCH CAUTION Water Damage Hazard Pressure Relief Valve discharge pipe must terminate at adequate drain. GENERAL REQUIRED ABILITY LOCATION PANELS AND COVERS CHEMICAL VAPOR CORROSION INSTALLTION CLEARANCES LEVELING AIR REQUIREMENTS Breathing Hazard - Carbon Monoxide Gas OUTDOOR AIR THROUGH TWO OPENINGS OUTDOOR AIR THROUGH ONE OPENING OUTDOOR AIR THROUGH TWO HORIzONTAL DUCTS OUTDOOR AIR THROUGH TWO VERTICAL DUCTS AIR FROM OTHER INDOOR SPACES TERMINATION CLEARANCES SIDEWALL POWER VENT A D C V X v v G CBB F V X v v G CBB F VENTING SPECIAL INSTALLATION CONSIDERATIONS VENTING SYSTEM USING AL 29-4C GENERAL EXHAUST VENT INSTALLATION PROCEDURE CONNECTING VENT TO BOILER VENTING SUPPORTS VERTICAL INSTALLATION REQUIREMENTS HORIzONTAL INSTALLTION REQUIREMENTS Page DIRECT VENT INSTALLATION REQUIREMENTS INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS IMPORTANT CAUTION FIGURE 12B. DIRECT VENT, VERTICAL VENT TERMINATION WITH HORIzONTAL INTAKE. FIGURE 12C. DIRECT VENT USING TWT WITH VERTICAL INTAKE. Option B (Figures 12B & 12C) assures no recirculation of ue gases. SYSTEM INSTALLATION GENERAL HOT WATER HEATING (HYDRONIC) EQUIPMENT INTERNAL CONTAMINANTS HOT WATER SUPPLY BOILER SYSTEM - GENERAL WATER LINE CONNECTIONS HARD WATER CONDITIONS THERMAL EXPANSION (CLOSED SYSTEM) REMOTE PROBE INSTALLATION PROCEDURE GAS CONNECTIONS GAS SUPPLY LINE SIzING TYPICAL PRIMARY, SECONDARY PIPING. ONE VF (MODEL VW) HOT WATER SUPPLY BOILER WITH VERTICAL TANK ONE VF (MODEL VW) HOT WATER SUPPLY BOILER WITH HORIzONTAL TANK DANGER WIRING SUGGESTED PIPE SIzING TABLES TABLE 6. Suggested Pipe Size For Multiple Gas Appliances (Natural Gas). TABLE 7. Suggested Pipe Size For Multiple Gas Appliances (Propane Gas). Page Page Page OPERATION IMPORTANT GENERAL FILLING AND PURGING OF HEATING BOILER INSTALLATION FILLING HOT WATER SUPPLY BOILER INSTALLATION WATER TEMPERATURE REGULATION Page Page ADJUSTMENT SETTING OF THE TEST MODE CONTROL SYSTEM INPUTS TO MCB OPERATING SEQUENCE UIM OPERATING PROCEDURES OPERATING SETPOINT ADJUSTMENT PROCEDURE HIGH LIMIT DIFFERENTIAL SETPOINT ADJUSTMENT PROCEDURE Page TROUBLESHOOTING IGNITION SYSTEM TROUBLESHOOTING GAS VALVE PREVENTATIVE MAINTENANCE MAIN BURNER RELIEF VALVE COMBUSTION AIR FILTER BLOWER COMPARTMENT BURNER MAINTENANCE CONDENSATE REMOVAL SYSTEM VENTING MAINTENANCE HEAT EXCHANGER PREVENTATIVE MAINTENANCE DELIMING TUBE CLEANING PROCEDURE MECHANICAL REMOVAL OF DEPOSITS REPLACEMENT PARTS Page Page Page LIMITED WARRANTY