A. O. Smith VB-1000 User Manual

Hydronic Heating Boilers

®

™

VB-500

UP TO 88% EFFICIENT, HYDRONIC BOILER WITH
MODULATING FIRE 4:1 TURNDOWN

The VF™ Boiler series delivers an exceptionally high thermal efficiency by combining an advanced
modulating venturi-mixing gas/air ratio system with a vertical multi-pass copper heat exchanger for
outstanding efficiency of up to 88% and low-NOx emissions that meet or exceed the most stringent
standards.

The VF™ Boiler is capable of firing from 100% to 25% or a 4:1 turndown ratio of rated input based
on the current system demand. The VF’s modulating capability is virtually limitless, and the boiler’s
output is based strictly on the current system demand and the required BTUs needed to maintain
the desired system set point temperature.

ADVANCED HIGH EFFICIENCY, LOW NOx COMBUSTION TECHNOLOGY

■ Venturi-mixing gas/air ratio system – Works with variable speed blower to precisely mix

gas and air throughout firing range

■ 4:1 Turndown – Fully modulating capabilities prevents energy stealing short cycling and

provides smooth system operation with higher overall system efficiencies.

■ Approved for use in areas with low pressure gas supply services – Provides good

operation with 4 inches of water column.

LOW NOx OPERATION

■ Complies with SCAQMD Rule 1146.2 and other Air Quality Management Districts with similar

requirements for low NOx emissions

EMC-5000 MODULATING CONTROL

■ Controls every electrical boiler function with on board diagnostics

■ Includes remote system loop temperature sensing probe – adjust heating loop

temperature at the boiler – modulates the boiler to maintain desired system
set point temperature within +/- 1 degree

■ iCOMM™ Compatible and can be monitored from remote locations.

Call 1.888.WATER02 for more information.

through

VB-2000

HIGH EFFICIENCY COPPER FIN TUBE HEAT EXCHANGER

■ Vertical straight tube 2 or 4 pass heat exchanger design encircles the burner

with a combustion chamber that is a 360° wall of copper fin tubes

■ Rust-resistant operation – All internal heat exchanger non copper surfaces are glass lined with

A. O. Smith’s proprietary porcelain glass coating, which far exceeds competitive coatings.

■ Impervious to thermal shock

OPTIONAL FACTORY MOUNTED AND WIRED PUMP AVAILABLE

■ Integral boiler mounted all bronze pump for primary/secondary pumping systems

■ Allows for 50 equivalent feet of pipe between boiler and primary loop

COMPACT, LOW-PROFILE DESIGN

■ Zero clearance on sides (500-1000), 4 inches on sides (1500-2000), ideal for multiple boiler installations

■ Fits through 30” door (500-1000), 31” door (1500-2000) and elevators for difficult retrofit applications

STANDARD VENT OR DIRECT VENT FLEXIBILITY

■ Standard-vent configuration, vertical or horizontal sidewall

■ Two-pipe direct-venting vertical and/or horizontal sidewall, with all combustion

makeup air drawn from outside the building

Revised September 2010

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AOSHG30000

™

UP TO 88% EFFICIENT, HYDRONIC BOILER WITH MODULATING FIRE 4:1 TURNDOWN

CATEGORY IV LISTED

• Requires AL29-4C gas tight rust resistant
venting material

FACTORY START-UP INCLUDED

• Required for activating warranty and
assuring maximum operating performance.
Contact your local sales representative or
Authorized Start-Up Agent to arrange a
FREE Certified Start-up.

MEETS THE THERMAL EFFICIENCY
AND STANDBY LOSS REQUIREMENTS OF
THE U.S. DEPARTMENT OF ENERGY
AND CURRENT EDITION OF
ASHRAE/IESNA 90.1

VERSATILE MULTI-VENTING CONFIGURATIONS

DIRECT-VENTING

10-YEAR HEAT EXCHANGER WARRANTY

• For complete information, consult written
warranty or contact A. O. Smith

OTHER VF BOILER FEATURES:

• ASME 160# W.P.

• ASME PRESSURE RELIEF VALVE 50#

• MEETS CSD-1 CODE-FACTORY STANDARD

• FLOW SWITCH MOUNTED

• BRASS DRAIN VALVE

• LOW GAS PRESSURE SWITCH

• DIGITAL INLET/OUTLET
TEMPERATURE READ OUT

• MANUAL RESET HI LIMIT

VF BOILER APPROVED OPTIONS:

LOW WATER CUTOFF
DRY CONTACTS FOR ANY

BOILER FAILURE
ALARM BUZZER
INTEGRAL BOILER MOUNTED PUMP

FOR PRIMARY/SECONDARY
PUMPING SYSTEMS

SEQUENCING PANEL
THROUGH-THE-WALL VENTING
DIRECT/SEALED VENT KIT
SKID-MOUNTED SYSTEM
LP GAS

ENERGY MANAGEMENT INTERFACE ADAPTER
(BacNet, Lonworks, for others contact the Factory)

SIDEWALL VENTING CONVENTIONAL

VENTING

Please consult latest edition of the Installation Manual for detail venting information and

maximum/minimum venting distances.

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AOSHG30000