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Automated Oxygen Control System for Gas-Fired Boilers
Optimized fuel:air ratios in gas-fired boilers yield a measurable excess oxygen
content in flue gas.
Utilizing this concept and the enabling technology of Lumec’s IRISvalve™, the Automated
Oxygen Control System (AOCS) manages excess oxygen to a user-defined setpoint for highly
efficient combustion.
The AOCS is a stand-alone, closed-loop control system that measures flue gas excess oxygen
and constantly adjusts fuel flow to achieve a user-selectable setpoint. The AOCS control valve
installs in a boiler’s existing gas train and does not require changes to the operating and safety
control systems.
Lumec’s breakthrough AOCS technology makes it possible to increase burner efficiency in
boilers much smaller than previously thought economically feasible.
Combustion Management
Operating Principle
Stand-alone — no mechanical or electrical interconnection with existing control
systems
Adds to and works independently from existing combustion systems
Safety systems are unaffected
Results
Most installations result in fuel savings exceeding 10%
Improved emissions
Lower maintenance costs
Compensates for
Changes in combustion air temperature and humidity, gas composition
Imprecise controls such as jackshafts, butterfly valves, dampers
Maintenance challenges such as dirty filters, loose linkages
Ease of Installation
The Automated Oxygen Control System easily and reliably installs on existing boilers
without removing, modifying or replacing legacy controls.
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4.
Install the AOCS IRISvalve™ between existing gas control system and boiler burner
Install oxygen sensor in flue
Set legacy fuel system to operate slightly rich
Using data from a 3-gas analyzer, determine optimum balance between flue CO and
O levels to establish AOCS excess oxygen setpoint
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Watch the system effortlessly control at excess O setpoint.
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Features
On-board, closed loop control
No interconnection with boiler control systems
Stand-alone operation
User-defined flue gas excess oxygen setpoint
Continuous monitoring of flue gas excess O
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Continuous adjustment of fuel gas
Simple commissioning
Standard 4-20 mA excess oxygen output and system diagnostics indicators
Rugged, economic, calibration-free oxygen sensor
IRISvalve™ flow control technology (See Bulletin #2000)
Download Brochure
Download CAD/DXF’s
Download Performance Data/Graphs
Specifications
Control and Feedback
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Optional User Interfaces
Ordering Information
Dimensions
Specifications
PARAMETERS
SPECIFICATIONS
Setpoint Range
1%-6% excess O
Control Accuracy
+/-0.25% excess O
Maximum Operating Pressure
5 psig (350 mbarg)
Operating Temperature Range
-40 to 140°F (-40 to 60°C)
2
2
Materials of Construction
Body
Cast Aluminum
Internal Mechanical
Steel, Cast Iron & Bronze
Iris Control Element
Stainless Steel
Seals
Buna-N Standard
Synthetic Grease
Lubricant
Operating Voltage
24 VDC/50 W
Sensor to AOC S IRISvalve™ cable
5 meters included (contact us for longer lengths)
6.0 lbs (2.7 kg)
Weight
13.0 lbs (5.9 kg)
30.0 lbs (13 kg)
Control and Feedback
Standard Automated Oxygen Control System (AOCS)
Suitable for Modulating, High/Low, and On/Off firing control schemes
On-board user selectable O (%) setpoint, (potentiometer)
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System output: Sensor-measured flue gas content, 0-20.9 O (%)
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LED Indicators (externally visible)
Power on
AOCS system faults
Valve at minimum position
Valve at maximum position
Optional User Interfaces
Two optional controllers are offered for those desiring complete autonomy of operation, visual performance feedback, and alarm functions. These controllers can
be remotely located from the boiler-mounted AOCS.
CONTROLLER INTERFACE
GRAPHICAL INTERFACE w/HISTORY
Real-time flue gas O (%) display
Real-time and historical flue gas
O (%) and alarm display
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2
120 VAC, 5A
Power Requirements
For 24 VDC to AOCS
Internal power supply
Enclosure
Black, keylock power switch, wall and pipe mount hardware included
User Selectable Parameters
Flue gas excess O2(%) setpoint
% + and/or - alarm band settings
Display
LCD, two lines of 3/4" characters
6" LCD touchscreen
Sensor-measured flue gas O (%)
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User-entered flue gas excess O (%) setpoint
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Graph of historical flue gas O (%)
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Alarm history
Alarm Outputs
Form C relay (optional)
(4) Form A relays
Display
Flue gas O (%) outside alarm band
2
AOCS system faults
Cabling (user interface to AOCS)
10 meters included (contact us for longer lengths)
Ordering Information
Sample Part Number
Click the options below to generate a part number.
XX - XXX - XX - X - X - X - XX - X
Model
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Automated Oxygen Control System — Boiler
Size
1/2 inch
NPT
3/4 inch
NPT
1 inch
NPT
1-1/2 inch
NPT
2 inch
NPT
2-1/2 inch
NPT
3 inch
NPT
4 inch
NPT
3 inch
Flanged
4 inch
Flanged
AOCS Power
24 VDC
Control Scheme
Natural Gas Control
Wiring Termination
Cord Grips
Optional User Interface
Standard
Controller
Pressure
Taps
(2) SPDT Dry
Contact Switches
Dimensions
DIMENSIONS 1/2", 3/4", 1" NPT IRISvalve™
DIMENSIONS 1-1/2", 2", 2-1/2" NPT IRISvalve™
DIMENSIONS 3", 4" FLANGED IRISvalve™
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DIMENSIONS SENSOR
USER INTERFACE OPTIONS
© 2012, Lumec Control Products, Inc.
2013-09-11 14:09