A. O. Smith XB-1000 User Manual
Hydronic Heating Boilers
FEATURES
The A. O. Smith high efficiency condensing XP Boiler utilizes a state-of-the-art heat exchanger and
control technology to meet the rigorous demands of today’s hydronic heating applications. The XP
Boiler’s all stainless steel water tube heat exchanger construction allows the XP Boiler to operate in a
continuous condensing mode while maximizing longevity and delivering exceptional energy-saving
performance. Low temperature applications such as heat pump and snow melting systems can see
thermal efficiencies as high as 99%, a major savings over non-condensing competitive systems.
A unique multi-burner design is control sequenced and modulated to produce turndown rates of up
to 20:1. Precise temperature control and accurate load matching results in smooth system operation
and eliminates wasteful short cycling and temperature overshooting.
ADVANCED MULTI-BURNER, LOW NOx COMBUSTION TECHNOLOGY
I Venturi-mixing gas/air ratio system - works with variable speed blower to precisely mix gas and
air throughout firing range
I Fully modulating capability prevents energy-stealing short cycling and provides smooth system
operation with higher overall system efficiencies
XB-1000
through
XB-3400
LOW NOx OPERATION
I Complies with SCAQMD Rule 1146.2 for XB1000 through XB2000 and Rule 1146.1 for XB2600
and XB3400, and other air quality management districts with similar requirements for
low NOx emissions
ADVANCED SOLA CONTROL
I Large touch screen user interface
I Direct MODBUS protocol connections
I The latest in energy saving algorithms
I Outdoor reset is standard and includes remote outdoor temperature sensor - modulates the
boiler to maintain desired system temperature within +/-1 degree
I Boiler output control features 20:1 turndown ratio on models 2 million btuh and up, 10:1
turndown ratio on models 1.7 million btuh and down
FACTORY-MOUNTED SECONDARY PUMP(S) (optional)
I Recommended for primary/secondary piping systems
I Integrally mounted, wired, and controlled by the boiler control
I Factory-sized for proper flow through the boiler
I Allow up to 50 equivalent feet of piping between the boiler and the primary heating system
MULTI-PASS/MULTI-BURNER CONDENSING STAINLESS STEEL HEAT EXCHANGER
I Utilizes leading-edge multi-pass water tube heat exchanger to maximize heat transfer
I Designed for fully condensing operation throughout the heating range
I All heating surfaces are 316L stainless steel to provide a long and trouble-free service life
I Saves fuel and operating cost with every heating cycle
I Impervious to thermal shock
DIRECT VENT FLEXIBILITY
I Direct vent up to 100 equivalent feet of pipe
I Sidewall or vertical
I Lower installation cost with approved CPVC/PVC venting material – uses CPVC for first
10 feet and PVC thereafter.
I Approved for use with UL approved AL29-4C®stainless steel venting materials
FACTORY START-UP INCLUDED
I 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.
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AOSBH30000
Hydronic Heating Boilers
CATEGORY IV LISTED
I Approved for use with CPVC/PVC venting material – uses CPVC for first 10 feet then PVC
thereafter or a UL approved AL 29-4C Stainless Steel venting material
PROFESSIONAL START-UP SERVICE INCLUDED
I Assures optimum performance for each installation
MEETS THERMAL EFFICIENCY OR COMBUSTION EFFICIENCY REQUIREMENTS OF THE
U. S. DEPARTMENT OF ENERGY AND CURRENT EDITION ASHRAE/IESNA 90.1
10-YEAR HEAT EXCHANGER WARRANTY
I For complete information, consult written warranty or contact A. O. Smith
OTHER XP BOILER FEATURES:
I 93% thermal efficiency (AHRI certified)
I Certified to ANSI Z21.13-CSA 4.9
I Honeywell sola control with color touch screen LCD display
· Inlet/outlet and remote loop temperature display
· Onboard modbus communications
· Logs faults, run time, cycles
· Redundant flow and low water protection - factory-installed LWCO and flow switch(s)
· Multi-burner sequencing models 2 million btuh and up have 4 burners; models 1.7 million
btuh and down have 2 burners
· Redundant ignition controls – should one burner fail remaining burners continue to heat
· Alarm buzzer
· Outdoor temperature sensor included
I 20:1 turndown models 2 million btuh and up, 10:1 turndown models 1.7 million btuh
and down
I Horizontal and vertical direct and sidewall vent options up to 100 equivalent feet of piping
I Approved for CPVC/PVC plastic vent materials
I Meets ASME CSD-1/GE gap codes – factory standard
I Direct spark ignition
I Factory-installed electrical disconnect
I 316L Stainless steel heat exchanger
I ASME 160# working pressure
I ASME rated pressure relief valve – 50 PSI
XP BOILER OPTIONS:
I Factory-mounted secondary pump (recommended for primary/secondary piping systems)
I Condensate neutralization kit
I Vent termination kits
I Skid mounted systems
XXBB MMOODDEELLSS -- FFLLOOWW,, HHEEAADD AANNDD TTEEMMPPEERRAATTUURREE RRIISSEE
Models
XB-1000 920,000 855,600
XB-1300 1,300,000 1,209,000
XB-1700 1,700,000 1,581,000
XB-2000 1,999,900 1,859,907
XB-2600 2,600,000 2,418,000
XB-3400 3,400,000 3,162,000
Note: Head Loss shown is through the boiler only and allows for no additional piping.
Input
(Btu/hr)
A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Output
(Btu/hr)
Water
Flow
GPM 86 57 43 86 43
LPM 324 216 162 324 162
ΔP FT
ΔP M
GPM 121 81 60 121 60
LPM 458 305 229 458 229
ΔP FT
ΔP M
GPM 158 105 79 158 79
LPM 598 399 299 598 299
ΔP FT
ΔP M
GPM 186 124 93 186 93
LPM 704 469 352 704 352
ΔP FT
ΔP M
GPM 242 161 121 242 121
LPM 915 610 458 915 458
ΔP FT
ΔP M
GPM 316 211 158 316 158
LPM 1197 798 598 1197 598
ΔP FT
ΔP M
Temperature Rise - ΔT °F
20 30 40 Maximum Minimum
26 12 7 26 7
7.9 3.7 2.1 8 2.1
32.5 15 8 32.5 8
9.9 4.6 2.4 9.9 2.4
35 14 8 35 8
10.7 4.3 2.4 10.7 2.4
26 12 7 26 7
7.9 3.7 2.1 7.9 2.1
32.5 15 8 33 8
9.9 4.6 2.4 9.9 2.4
35 14 8 35 8
10.7 4.3 2.4 11 2.4
Flow Rate
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