User ManualTable of ContentsSAFE INSTALLATION, USE AND SERVICE2GENERAL SAFETY3dimension and capacity data4capacity AND FLOW data5contents6introduction6Grounding Instructions7Inlet Water Considerations7Correct Gas7Precautions7Liquefied Petroleum Gas Models7High Altitude Installations7Field Installed Components7Control Components8The Control System8Hot Surface Igniter8Pressure Switches8Low Gas Switch8Water Flow Switch8Flame Sensor8Water Temperature Limit Controls9ON/OFF Switch9Circulating Pump9Temperature Probes9Low Water Cutoff (Optional)9Pressure Relief Valve9GENERAL10Required Ability10Location10Panels and Covers10Chemical Vapor Corrosion11Installtion Clearances11Leveling11Air Requirements11Unconfined Space11Confined Space11Fresh Air Openings for Confined Spaces11Outdoor Air Through Two Openings12Outdoor Air Through One Opening12Outdoor Air Through Two Horizontal Ducts12Outdoor Air Through Two Vertical Ducts12Air From Other Indoor Spaces13Termination Clearances Sidewall Power Vent14Termination Clearances Sidewall Direct Vent15VENTING16Special Installation Considerations16Venting System Using AL 29-4C®16General Exhaust Vent Installation Procedure16Connecting Vent to Boiler16Venting Supports17Vertical Installation Requirements17Horizontal Installtion Requirements17Direct Vent Installation Requirements19INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS19system installation22General22Hot Water Heating (Hydronic) Equipment22Internal Contaminants23Hot Water Supply Boiler System - General Water Line Connections23Hard Water Conditions23Thermal Expansion (Closed System)23Remote Probe Installation Procedure23Gas Connections24Gas Supply Line Sizing24Wiring28Suggested Pipe Sizing Tables29Wiring Diagram30VB/VW-500, 750 & 1000 SCHEMATIC DIAGRAM32operation33Important33General33Filling and Purging of Heating Boiler Installation33Filling Hot Water Supply Boiler Installation33Purging Gas Line33Inlet Gas Pressure33Water Temperature Regulation34LIGHTING & OPERATION INSTRUCTIONS FOR MODELS VB/VW 500, 750 AND 1000:36Adjustment37Setting of the Test Mode37Control System37Inputs to MCB38Operating Sequence39UIM Operating Procedures40Operating Setpoint Adjustment Procedure41High Limit Differential Setpoint Adjustment Procedure42TROUBLESHOOTING IGNITION SYSTEM44Troubleshooting Gas Valve45Main Burner45preventative maintenance45Relief Valve46Combustion Air Filter46Blower Compartment46Burner Maintenance46Condensate Removal System46Venting Maintenance47Heat Exchanger Preventative Maintenance47Deliming47Tube Cleaning Procedure Mechanical Removal of Deposits47Replacement Parts47notes48LIMITED WARRANTY51Size: 4.22 MBPages: 52Language: EnglishOpen manual