A.O. Smith VB/VW- 1000, VB/VW- 750 instruction manual Contents, Introduction

contents

SAFE INSTALLATION, USE AND SERVICE		2	Horizontal Installtion Requirements	17
GENERAL SAFETY		3	Direct Vent Installation Requirements	19
dimension and capacity data		4	INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF
capacity AND FLOW data		5	MASSACHUSETTS	19
contents		6	system installation	22
introduction		6	General	22
Grounding	Instructions	7	Hot Water Heating (Hydronic) Equipment	22
Inlet Water	Considerations	7	Internal Contaminants	23
Correct Gas		7	Hot Water Supply Boiler System - General Water Line Connections...	23
Precautions		7	Hard Water Conditions	23
Liquefied Petroleum Gas Models		7	Thermal Expansion (Closed System)	23
High Altitude Installations		7	Remote Probe Installation Procedure	23
Field Installed Components		7	Gas Connections	24
Control Components		8	Gas Supply Line Sizing	24
The Control System		8	Wiring	28
Hot Surface Igniter		8	Suggested Pipe Sizing Tables	29
Pressure Switches		8	Wiring Diagram	30
Low Gas Switch		8	VB/VW-500, 750 & 1000 SCHEMATIC DIAGRAM	32
Water Flow Switch		8	operation	33
Flame Sensor		8	Important	33
Water Temperature Limit Controls		9	General	33
ON/OFF Switch		9	Filling and Purging of Heating Boiler Installation	33
Circulating	Pump	9	Filling Hot Water Supply Boiler Installation	33
Temperature Probes		9	Purging Gas Line	33
Low Water	Cutoff (Optional)	9	Inlet Gas Pressure	33
Pressure Relief Valve		9	Water Temperature Regulation	34
GENERAL		10	LIGHTING & OPERATION INSTRUCTIONS	36
Required Ability		10	Adjustment	37
Location		10	Setting of the Test Mode	37
Panels and Covers		10	Control System	37
Chemical Vapor Corrosion		11	Inputs to MCB	38
Installtion Clearances		11	Operating Sequence	39
Leveling		11	UIM Operating Procedures	40
Air Requirements		11	Operating Setpoint Adjustment Procedure	41
Unconfined Space		11	High Limit Differential Setpoint Adjustment Procedure	42
Confined Space		11	TROUBLESHOOTING IGNITION SYSTEM	44
Fresh Air Openings for Confined Spaces		11	Troubleshooting Gas Valve	45
Outdoor Air Through Two Openings		12	Main Burner	45
Outdoor Air Through One Opening		12	preventative maintenance	45
Outdoor Air Through Two Horizontal Ducts		12	Relief Valve	46
Outdoor Air Through Two Vertical Ducts		12	Combustion Air Filter	46
Air From Other Indoor Spaces		13	Blower Compartment	46
Termination Clearances Sidewall Power Vent		14	Burner Maintenance	46
Termination Clearances Sidewall Direct Vent		15	Condensate Removal System	46
VENTING		16	Venting Maintenance	47
Special Installation Considerations		16	Heat Exchanger Preventative Maintenance	47
Venting System Using AL 29-4C®		16	Deliming	47
General Exhaust Vent Installation Procedure		16	Tube Cleaning Procedure Mechanical Removal of Deposits	47
Connecting Vent to Boiler		16	Replacement Parts	47
Venting Supports		17	notes	48
Vertical Installation Requirements		17	LIMITED WARRANTY	51

introduction

This design complies with the current edition of the ANSI Z21.13 low-pressure boiler standard.

Compliance under this standard implies that when the boiler underwent test, the gas manifold and control assembly pro­vided on the boiler met safe lighting and other performance criteria.

Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer a reference for the materials and methods of piping necessary. It is essential that all water, gas piping and wiring be installed as shown on the diagrams. You should thoroughly read and understand this manual before installation and/or operation of this boiler.

The factory warranty will be void if the boiler(s) have been improperly installed or operated.

AL 29-4C®is a registered trademark of Allegheny Ludlum Corporation.

In addition to these instructions, the boiler(s) shall be installed in

accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction should be consulted before installations are made.

In the absence of local codes, the installation must comply with the current editions, as follows:

In the United States:

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electric Code, NFPA 70.

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