A.O. Smith VW-500, VW-750 User manual

The Art Of Flexibility
The new VF Series variable fire
copper boilers are designed with
one thing in mind: to provide
the best value to the customer.
As a result, we’re proud to
introduce a more installation
friendly line that works well in
more applications and requires
less maintenance.
The secret to the stunning
performance of the VF Series is
its flexibility.The VF is capable of
firing from 100% to 25% or a
4:1 turndown ratio. The boiler’s
output is based strictly on the
current system demand and
required BTUs needed to maintain
the desired system set point
temperature. The VF’s modulating
capability is virtually limitless.
The VF Boiler sets a high efficiency
standard by combining thermal
efficiencies up to 88% with a
smoother
,more energy-efficient
overall system operation.

Combustion
air intake – self
adjusting-no air
shutter required
EMC-5000
Modulating Control
Advanced pre-mix
burner design
precisely mixes
air and gas prior to
ignition for optimum
performance, with
low-NOx emissions
(meets SCAQMD
Rule 1146.2)
All non-heating
surface heat
exchanger compo-
nents areoutside
and away from the
combustion and flue
collection areas;
only the copper fin
tubes are exposed
to the products of
combustion
Venturi-mixing gas/air
ratio system works with
variable speed blower to
precisely mix gas and air
throughout firing range,
provides good operation
with supply gas pressures
down to 4˝ WC, and
is self-adjusting for
altitudes up to 6,000
feet all while providing
low NOx emissions that
meet or exceed the most
stringent standards
Heavy-duty ASME 160
psi copper finned tube
heat exchanger—Vertical,
straight tube, multi-pass
design surrounds the
burner with a 360° wall
of copper finned tubing,
making the entire heat
exchanger immune to
thermal shock
The sealed heat
exchanger flue collection
system is constructed
of AL29-4C stainless
steel that is immune
to corrosive flue gases
C
D
B
A E
F
THE ANATOMY OF GREAT PERFORMANCE
E
B
G
D
D
G
A
C
F

Versatile Multi-Venting Configurations
Hot Water Supply
Applications:
VW-500 through
VW-1000
Hydronic Heating
Applications:
VB-500 through
VB -1000
COMMERCIAL GAS BOILERS
CATEGORY IV LISTED
PROFESSIONAL START-UP SERVICE FURNISHED
MEETS ASHRAE/IESNA 90.1-1999
LOW NOx OPERATION
■Meets or exceeds Texas and California
SCAQMD Rule 1146.2 quality standards
OTHER VF™BOILER FEATURES:
■ASME Pressure Relief Valve 125#
■Factory-Mounted Flow Switch
■Low Gas Pressure Switch
■All Bronze Factory Mounted Pump
Standard on VW hot water supply models
■Digital Inlet/Outlet Temperature Read Out
■Manual Reset Hi-Limit
WARRANTY:
■5Year Limited Heat Exchanger
Warranty on VW Models
■10 Year Limited Heat Exchanger Warranty
on VB Models
VF™BOILER APPROVED OPTIONS*
*For optional boiler equipment see VF Boiler VB and V W spec sheets.
Up To 88% Efficient,
Hot Water Supply
Boiler with
Modulating Fire
4:1 Turndown
■Two-pipe direct-venting vertical and /or horizontal sidewall, with all
combustion makeup air drawn from outside the building
70 Equivalent Feet Exhaust
70 Equivalent Feet Intake
90 Degree Elbows = 10 Feet
45 Degree Elbows = 5 Feet
Boot Tee = 5 Feet
■Standard- venting, vertical or horizontal sidewall
100 Equivalent Feet Max
90 Degree Elbows = 10 Feet
45 Degree Elbows = 5 Feet
Boot Tee = 5 Feet
DIRECT-VENTING
SIDEWALL CONVENTIONAL
VENTING VENTING
Please consult latest edition
of the Installation Manual for
detail venting information
and maximum/minimum
venting distances.
SHORTTRIM

The EMC-5000 Modulating Control provides true self-diagnostic capabilities to eliminate
guesswork in troubleshooting. It is the most advanced boiler control we have ever offered,
setting a new standard for copper boilers.
Advanced EMC-5000 Modulating Control
Small Size And
Easy Service
Small Footprints, Zero Clearance
To Combustibles On Sides of Unit
■Compact design, lightweight
copper heat exchanger makes
VF Series easier to move and
install in limited spaces –
perfect for retrofits
■Fits in an elevator, ideal for
boiler rooms with limited
access — only 30˝ wide
■Multiple boiler systems provide
increased turndown and even
smoother
,more efficient
system operation
■4boilers w/4:1 Turndown
=1
6:1 total system turndown
EMC-5000 Modulating Control
■Modulates the boiler to
maintain tank temperature
within +/- 1 degree
■Infinite boiler output control
between 100% to 25% fire
■LED read out – provides
current boiler status in
plain English with help
screens to assist should
afault occur
■Controls and monitors every
electrical boiler function with
onboard diagnostics
SHORTTRIM

Model Input Rating Output Rating Gallons Per Hour Recovery Height Width Depth W/ Depth W/O Approx.
No. Btu/hr Btu/hr Temperature Rise -°F Inches Inches Pump Pump Shipping
Inches Inches Weight (Lbs.)
40 100 140
VW/
VB-500 500,000 421,500 1,268 507 362 56 30 37.5 30 450
VW/
VB-750 750,000 633,750 1,901 761 543 62 30 37.5 30 575
VW/
VB-1000 1,000,000 845,000 2,535 1,014 724 71 30 37.5 30 750
Ac-U-Temp — A total hot water supply
system using VF Series Boilers
With Ac-U-Temp, A. O. Smith makes it as easy as possible
to install a complete packaged hot water supply system,
combining 88% efficient VF Series Boilers with A. O. Smith
storage tanks. A. O. Smith offers a wide range of available
boiler/storage tank combinations using the Ac-U-Temp
system. There are a number of standard boiler and tank
configurations with tanks up to 1,000 gallons, or we can
custom design and build an Ac-U-Temp system with tanks
up to 10,000 gallons to meet your specifications and
application requirements. Ac-U-Temp systems are shipped
fully assembled, pre-piped and pre-wired. All the installer
has to do is make the flue, gas, electrical and water
connections, so field errors are minimized.
Consult your A. O. Smith representative for more
information on the wide range of available boiler/storage
tank combinations using the Ac-U-Temp system.
For complete specifications on the VF Series, consult the
specification sheets at www.hotwater.com or contact your
local A. O. Smith sales representative.
ACGBR00307 ©2007 A. O. Smith Corporation A. O. Smith reserves the right to make product changes or improvements at any time without notice. Printed in U.S.A
500 Tennessee Waltz Parkway •Ashland City, TN 37015
www.hotwater.com
Examples of
Ac-U-Temp
Systems