Table Of Contents - A.O. Smith VB/VW 1500, 2000 Instruction Manual

TABLE OF CONTENTS .......................................................................2
SAFE INSTALLATION, USE, AND SERVICE ...................................3
APPROVALS ..........................................................................................3
GENERAL SAFETY........................................................................... 4-5
INTRODUCTION ..................................................................................6
DIMENSION AND CAPACITY DATA ............................................ 6-7
CAPACITY AND FLOW DATA .............................................................8
CONTROL COMPONENTS ............................................................ 8-9
The Control System .........................................................................8
Hot Surface Igniter .........................................................................8
Pressure Switches ..........................................................................8
Low Gas Switch .............................................................................9
Low Gas Pressure Switch ..............................................................9
Gas Valve ..........................................................................................9
Flow Switch .......................................................................................8
Flame Sensor....................................................................................9
Water Temperature Limit Controls ................................................10
On/Off Switch ..................................................................................10
Circulating Pump ............................................................................10
Temperature Probes .......................................................................10
Low Water Cutoff (Optional) .........................................................10
Pressure Relief Valve ...............................................................10-11
GENERAL
Required Ability ...............................................................................11
Location ..........................................................................................11
Replacing Existing Common Vented Boiler ...........................11-12
Panels and Covers ........................................................................12
Chemical Vapor Corrosion ..........................................................12
Installation Clearances .................................................................12
Leveling ..........................................................................................12
Air Requirements ............................................................................12
Unconfined Space ..........................................................................12
Confined Space ..............................................................................12
Fresh Air Openings For Confined Spaces .................................13
Outdoor Air Through Two Openings............................................13
Outdoor Air Through One Opening .............................................13
Outdoor Air Through Two Horizontal Ducts ...............................13
Outdoor Air Through Two Vertical Ducts ....................................14
Air From Other Indoor Spaces ....................................................14
Termination Clearances Sidewall Power Vent ............................15
Termination Clearances Sidewall Direct Vent .............................16
VENTING ..............................................................................................17
Special Installation Considerations . ............................................17
Venting System Using AL 29-4C® ............................................17
General Exhaust Vent Installation Procedure .............................17
Connecting Vent to Boiler ...........................................................17
Venting Supports ..........................................................................18

TABLE OF CONTENTS

SYSTEM INSTALLATION ................................................................. 23
SUGGESTED PIPE SIZING TABLES ................................................ 27
PIPING DIAGRAMS ......................................................................28-30
SCHEMATIC DIAGRAM ..................................................................... 31
WIRING DIAGRAM .......................................................................32-33
OPERATION ....................................................................................... 34
LIGHTING AND OPERATING INSTRUCTIONS ............................... 36
TROUBLESHOOTING IGNITION SYSTEM ...................................... 43
PREVENTATIVE MAINTENANCE ..................................................... 44
LIMITED WARRANTY ........................................................................ 43
2
Vertical Installation Requirements ............................................. 18
Horizontal Installation Requirements ........................................ 18
Direct Vent Installation Requirements ...................................... 18
Installation Requirements for the Commonwealth of Mass .... 20
General ......................................................................................... 23
Hot Water Heating (Hydronic) System ......................................... 23
Internal Contaminants ................................................................... 24
Hot Water Supply System General Water Line Connections ...... 24
Hard Water Conditions ................................................................. 25
Thermal Expansion (Closed System). ........................................... 25
Gas Connections ........................................................................... 25
Field Wiring ................................................................................... 26
Important ........................................................................................ 34
General ......................................................................................... 34
Filling and Purging for Heating Boiler Installation ......................... 34
Filling for Hot Water Supply Boiler Installation .............................. 34
Purging Gas Line .......................................................................... 34
Inlet Gas Pressure ........................................................................ 34
Water Temperature Regulation ...................................................... 35
Manifold Pressure Connections ................................................... 35
Adjustment ..................................................................................... 37
Setting of the Test Mode ................................................................ 37
Control System .............................................................................. 37
Inputs to MCB ................................................................................ 38
Dipswitches ...............................................................................38-39
Operating Sequence ...................................................................... 39
Operating Setpoint Adjustment Procedure .................................... 41
Troubleshooting Gas Valve ............................................................ 44
Main Burner ..............................................................................44-45
Relief Valve .................................................................................... 45
Blower Compartment ..................................................................... 45
Burner Maintenance ...................................................................... 45
Condensate Removal System ....................................................... 45
Venting Maintenance ..................................................................... 46
Heat Exchanger Preventive Maintenance ..................................... 46
Tube Cleaning Procedure ............................................................. 46
Replacement Parts ........................................................................ 46