Aerco BMK 2500 User Manual
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Aerco BMK 2500 User Manual

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Benchmark 2500 - 3000 Boilers
Installation, Operation & Maintenance Manual (IOMM)
USER MANUAL
Installation, Operation and Maintenance
BENCHMARK
2500 / 3000
Natural Gas Modulating
& Condensing Hot Water
Gas-Fired Boilers
Boiler Models:
• BMK 2500
• BMK 3000
Applicable to Serial Numbers:
G-15-2700 and Above
Latest Update: 09/30/2015
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0094_0F
Page 1 of 207
Ph.: 800-526-0288
GF-137
09/30/2015

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  • Page 1 Gas-Fired Boilers Boiler Models: • BMK 2500 • BMK 3000 Applicable to Serial Numbers: G-15-2700 and Above Latest Update: 09/30/2015 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 1 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 2 The information contained in this manual is subject to change without notice from AERCO International, Inc. AERCO makes no warranty of any kind with respect to this material, including, but not limited to, implied warranties of merchantability and fitness for a particular application.

  • Page 3: Table Of Contents

    3.3 CONTROL PANEL MENUS ........................39 3.3.1 Menu Processing Procedure ........................... 39 3.4 OPERATING MENU ..........................41 3.5 SETUP MENU ............................41 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 3 of 207 Ph.: 800-526-0288...
  • Page 4 6.6 INTERLOCK TESTS ..........................79 6.6.1 Remote Interlock Test............................. 79 6.6.2 Delayed Interlock Test ............................ 79 6.7 FLAME FAULT TESTS ......................... 80 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 4 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 5 APPENDIX C: SENSOR RESISTANCE/VOLTAGE CHART ............149 APPENDIX D: RECOMMENDED PERIODIC TESTING ............151 APPENDIX E: INDOOR/OUTDOOR RESET RATIO CHARTS ..........153 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 5 of 207 Ph.: 800-526-0288...
  • Page 6 APPENDIX J: PIPING DRAWINGS ....................191 APPENDIX K: C-MORE CONTROL PANEL VIEWS ..............199 APPENDIX L: RECOMMENDED SPARES ................... 201 APPENDIX M: KOREAN GAS TRAINS..................203 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 6 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 7: Foreword

    15:1. These BMK models provide extremely high efficiency operation and are ideally suited for modern low temperature, as well as, conventional heating systems. The Benchmark Model BMK 2500 and BMK 3000 operate within the following input and output ranges: Benchmark Input Range (BTU/hr.)
  • Page 8 BTUs per Hour (1 BTU/hr = 0.29 W) Combination Control Panel Combination Control System C-More Controller A control system developed by AERCO and currently used in all Benchmark, (or Control Box) Innovation and KC1000 Series product lines. Cubic Feet per Hour (1 CFH = 0.028 m...
  • Page 9 Hardware interface between BAS and a boiler or water heater Poly Vinyl Chloride, a common synthetic plastic Pulse Width Modulation REF (Ref) Reference AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 9 of 207 Ph.: 800-526-0288 GF-137...
  • Page 10 W.C. Water Column, a unit of pressure (1 W.C. = 249 Pa) µA Micro amp (1 million of an ampere) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 10 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 11: Chapter 1. Safety Precautions

    In addition to all the requirements included in this AERCO Instruction Manual, the installation of units MUST conform with local building codes, or, in the absence of local codes, ANSI Z223.1 (National Fuel Gas Code Publication No. NFPA-54) for gas-fired boilers and ANSI/NFPASB for LP gas-fired boilers.

  • Page 12: Emergency Shutdown

    Chapter 6 of this manual be performed, to verify all system- operating parameters. If there is an emergency, turn off the electrical power supply to the AERCO boiler and close the manual gas valve located upstream the unit. The installer must identify the emergency shut-off device.
  • Page 13 248 CMR 5.08(2)(a)1 through 4. (b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4: AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 13 of 207 Ph.: 800-526-0288...
  • Page 14 ____________________________________________________________________________ [End of Extracted Information From 248 CMR 5.08 (2)] AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 14 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 15: Chapter 2. Installation

    2.1 INTRODUCTION This Chapter provides the descriptions and procedures necessary to unpack, inspect and install the AERCO Benchmark Boiler Models BMK 2500 and BMK 3000. 2.2 RECEIVING THE UNIT Each Benchmark Boiler System is shipped as a single crated unit. The shipping weight for these BMK models is approximately 2200 pounds (1000 kg).

  • Page 16: Site Preparation

    The Benchmark Model 2500 and 3000 are packaged in an enclosure having identical exterior dimensions. The unit must be installed with the prescribed clearances for service as shown in Figure 2-1a. The minimum clearance dimensions, required by AERCO, are listed below. However, if Local Building Codes require additional clearances, these codes shall supersede AERCO’s requirements.

  • Page 17: Setting The Unit

    4 inch to 8 inch (10.2 cm to 20.3 cm) concrete housekeeping pad (required) in the desired location. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 17 of 207 Ph.: 800-526-0288...

  • Page 18: Supply And Return Piping

    Figure 2-3. The physical location of the supply and return piping connections on the rear of the unit are shown in Figure 2-3. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 18 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 19: Pressure Relief Valve Installation

    AERCO SmartPlates, thermal efficiency can improve by up to 10%. If your unit includes the secondary inlet, pipe the warmer return water to the secondary (upper) inlet and the cooler return water to the primary (lower) inlet. Contact your AERCO representative for additional information.

  • Page 20: Condensate Drain & Piping

    • The base of the condensate trap must be supported to ensure that it is level (horizontal). • The trap must be removable for routine maintenance. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 20 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 21: Condensate Trap Installation

    EXHAUST THICK UNDER THE FLOOR MANIFOLD CONDENSATE DRAIN DRAIN PORT ASSEMBLY. Figure 2-6: Sample Condensate Trap Installation (Right Side View) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 21 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 22: Gas Supply Piping

    Benchmark 2500 - 3000 Boilers CHAPTER 2 – INSTALLATION 2.8 GAS SUPPLY PIPING The AERCO Benchmark Gas Components and Supply Design Guide, GF-2030 must be consulted prior to designing or installing any gas supply piping. WARNING! NEVER USE MATCHES, CANDLES, FLAMES OR OTHER...
  • Page 23 However, AERCO offers for sale an appropriate regulator, which may be ordered at the time of unit purchase or separately. Contact AERCO for more information. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913...

  • Page 24: Ac Electrical Power Wiring

    CHAPTER 2 – INSTALLATION 2.9 AC ELECTRICAL POWER WIRING The AERCO Benchmark Electrical Power Wiring Guide, GF-2060, must be consulted prior to connecting any AC power wiring to the unit. External AC power connections are made to the unit inside the Power Box on the front of the unit. Remove the front panel to access the Power Box, which is mounted in the upper right corner of the unit as shown in Figure 2-8.

  • Page 25: Electrical Power Requirements

    National Electrical Code (NEC), ANSI/NFPA 70 and/or the Canadian Electrical Code (CEC) Part I, CSA C22.1 Electrical Code. For electrical power wiring diagrams, see the AERCO Benchmark Electrical Power Guide, (GF- 2060). AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913...

  • Page 26: Field Control Wiring

    WARNING! DO NOT make any connections to the I/O Box terminals labeled “NOT USED”. Attempting to do so may cause equipment damage. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 26 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 27: Outdoor Air In Terminal

    61024). This input is always enabled and is a “to view only” input that can be seen in the Operating menu. A resistance chart for this sensor is provided in APPENDIX C. This sensor is AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 27 of 207 Ph.: 800-526-0288...

  • Page 28: O 2 Sensor Terminals

    Chapter 3. If voltage rather than current is selected as the drive signal, a DIP switch must be set on the PMC Board located inside the C-More Control Box. Contact the AERCO factory for information on setting DIP switches.

  • Page 29: Shield Terminals

    2.10.9 RS485 Comm Terminals The RS-485 communication terminals (+, GND, & -) are used when the boiler plant is being controlled by an Energy Management System (EMS) or AERCO ACS (formerly BMS/BMS-II) using Modbus (RS-485) communication. 2.10.10 RS232 Comm Terminals As of Firmware version 4.0 and above, these terminals are used only by factory-trained...

  • Page 30: Fault Relay Terminals

    Figure 2-12 to locate the AUXILLIARY RELAY terminals for wiring connections. 2.11 FLUE GAS VENT INSTALLATION AERCO Gas Fired Venting and Combustion Air Guide, GF-2050 must be consulted before any flue or combustion air venting is designed or installed. Suitable, U/L approved, positive pressure, watertight vent materials MUST be used for safety and UL certification.

  • Page 31: Combustion Air

    For combustion air supply from ducting, consult the AERCO GF-2050, Gas Fired Venting and Combustion Air Guide. When combustion air is provided from within the building, it must be supplied to the unit(s) through two permanent openings.

  • Page 32: Sequencing Isolation Valve Installation

    (P/N 92084-TAB) included in the shipping container. This valve is an integral component of the AERCO’s on-board Boiler Sequencing Technology (BST) solution. BST allows sites with multiple boilers to have one boiler, acting as a “master” to manage the other boilers at the site in such a way that the efficiency of the entire boiler array is maximized.
  • Page 33 Figure 2-14: Sequencing Isolation Valve Installed 3. Remove the jumper wire from the Molex connector and then plug it into the sequencing isolation valve’s connector. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 33 of 207 Ph.: 800-526-0288...
  • Page 34 Benchmark 2500 - 3000 Boilers CHAPTER 2 – INSTALLATION (This Page Is Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 34 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 35: Chapter 3. Operation

    These operating controls, indicators and displays are listed and described in Table 3-1. Additional information on these items is provided in the individual operating procedures and menu descriptions provided in this Chapter. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 35 of 207 Ph.: 800-526-0288...
  • Page 36 Benchmark 2500 - 3000 Boilers CHAPTER 3 – OPERATION Figure 3-1: Control Panel Front View AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 36 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 37 Low Water Level alarm. TEST/RESET Pressing RESET resets the water level monitor circuit. switches Pressing the CLEAR key (item 6) resets the display. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 37 of 207 Ph.: 800-526-0288 GF-137...
  • Page 38 20 segment red LED bargraph continuously shows the VALVE POSITION Air/Fuel Valve position in 5% increments from 0 to 100% Bargraph AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 38 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...

  • Page 39: Control Panel Menus

    The menu option choices do not wrap around. 7. To select and store a changed menu item, press the ENTER key. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 39 of 207 Ph.: 800-526-0288...
  • Page 40 Refer to Appendix B for listings and descriptions of displayed startup, status and error messages. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 40 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...

  • Page 41: Operating Menu

    Setup menu is also used to enter date and time, and units of temperature measurements. A view-only software version display is also provided to indicate the current Control Box software version. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 41 of 207 Ph.: 800-526-0288...

  • Page 42: Configuration Menu

    The Configuration menu settings shown in Table 3-4 are Factory- Set in accordance with the requirements specified for each individual order. Therefore, under normal operating conditions, no changes will be required. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 42 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 43 Pos 4-20mA, valve Pos 0-10v Low Fire Timer 2 sec. 600 sec. 2 sec. Setpt Limiting Enabled or Disabled Disabled AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 43 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 44: Tuning Menu

    Warmup Int Gain 0.00 2.00 0.50 Warmup PID timer 0 sec. 240 sec. 20 sec. Reset Defaults? Yes, No, Are You Sure? AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 44 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 45: Combustion Cal Menu

    The Items contained in group 1 (BST Monitor Items) are ALWAYS displayed within the menu, as these items are critical for proper system operation. Therefore, the BST Monitor Items Header itself is NOT displayed. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 45 of 207 Ph.: 800-526-0288...
  • Page 46 130°F (54.4°C) Setback Start 12:00am 11:59pm 12.00am Setback End 12:00am 11:59pm 12.00am Rate Threshold 1°F (0.55°C) 30°F (16.5°C) 15°F (8.25°C) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 46 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 47 BST Max Addr SSD Address SSD Poll Control 1000 Err Threshold SSD Temp Format Degrees Points Degrees BST Upld Timer 9999 sec AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 47 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 48: Start Sequence

    NATURAL SWITCH GAS INLET SSOV AIR/FUEL LOW GAS VALVE MANUAL PRESSURE SHUT-OFF SWITCH VALVE BMK 2500: Figure 3-3a: SSOV Location AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 48 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 49 Next, the Blower Proof switch on the Air/Fuel Valve (Figure 3-5) closes. The display will show PURGING and indicate the elapsed time of the purge cycle in seconds. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 49 of 207 Ph.: 800-526-0288...
  • Page 50 (d) If no spark is present 3 seconds into the IGNITION TRIAL, the C-More will abort the Ignition Cycle and shut down the boiler. Refer to Chapter 8: Troubleshooting for guidance if this occurs. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 50 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 51 Once the demand for heat has been satisfied, the Control Box will turn off the SSOV gas valve. The blower relay will be deactivated and the Air/Fuel Valve will be closed. STANDBY will be displayed. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 51 of 207 Ph.: 800-526-0288...

  • Page 52: Start/Stop Levels

    1,270,000 (372 kW) 1,680,000 (492 kW) 2,100,000 (615 kW) 2,390,000 (700 kW) 2,650,000 (777 kW) 100% 3,000,000 (879 kW) 100% AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 52 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 53: Chapter 4. Initial Start-Up

    Safety Device Testing procedures specified in Chapter 6 to complete all initial unit start-up requirements. An AERCO Gas Fired Startup Sheet, included with each Benchmark, must be completed for each unit for warranty validation and a copy must be returned promptly to AERCO via e-mail at: STARTUP@AERCO.COM WARNING! DO NOT ATTEMPT TO DRY FIRE THE UNIT.

  • Page 54: Required Tools & Instrumentation

    VALVE LOW GAS PRESSURE MANUAL SWITCH SHUT-OFF VALVE Figure 4-1a: BMK 2500: 1/4 Inch Gas Plug Location for Combustion Calibration AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 54 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 55 Attach one end of the plastic tubing to the barbed fitting and the other end to the 16” W.C. (0 to 4000 Pa) manometer. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 55 of 207 Ph.: 800-526-0288...

  • Page 56: Accessing The Analyzer Probe Port

    Recalibration as part of initial start-up is necessary due to changes in the local altitude, gas BTU content, gas supply piping and supply regulators. Combustion Calibration Test Data sheets are shipped with each unit. These sheets must be filled out and returned to AERCO for proper Warranty Validation.

  • Page 57: Benchmark 2500 Combustion Calibration

    Table 4-2: Combustion Calibration Readings – 100% valve Position Valve Position Oxygen (O Nitrogen Oxide (NOx) Carbon Monoxide (CO) ≤20 ppm 100% 5.0% - 6.0% <100 ppm AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 57 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 58 27. Once the oxygen level is within the specified range at 70%, press the ENTER key to store the selected blower output voltage for the 70% valve position. Record all readings on the Combustion Calibration Sheets provided. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 58 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 59 Recalibration MUST be performed again from 50% down to 16% after making a change to the idle screw (TAC valve). 30. This completes the BMK 2500 Natural Gas combustion calibration procedures. BRASS HEX HEAD (Remove to access the Gas Pressure Adjustment Screw).

  • Page 60: Benchmark 3000 Combustion Calibration

    (approximately 1/4-turn increments). Allow the combustion analyzer to stabilize following each adjustment. Clockwise rotation reduces the oxygen level, while counterclockwise rotation increases the oxygen level. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 60 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 61 ), nitrogen oxide (NOx) and carbon monoxide (CO) should remain within the same limits for all valve positions as shown in the following table. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 61 of 207 Ph.: 800-526-0288...

  • Page 62: Reassembly

    Replace the 1/4” NPT plug in the manifold. 6. Replace all previously removed sheet metal enclosures on the unit. 7. This concludes reassembly of the unit after combustion calibration. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 62 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 63: Over-Temperature Limit Switches

    Figure 4-6 and Table 4-8. Alarm Limit Control Figure 4-6: Digital Over-Temperature Alarm Switch Front Panel AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 63 of 207 Ph.: 800-526-0288 GF-137...
  • Page 64 Temperature Alarm switch. Access code value 0 should appear in the display. The switch comes from the factory with the code set at 0. AERCO recommends that you do not change this code. Press the SET button again to enter the code. The first parameter label (SP) will appear in the display.

  • Page 65: Chapter 5. Mode Of Operation

    I/O Box. Use shielded 18 to 22 AWG wire for connections. A wiring diagram is provided on the cover of the I/O Box. Refer to Chapter 2, section 2.9.1 for additional wiring information. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 65 of 207 Ph.: 800-526-0288...

  • Page 66: Indoor/Outdoor Startup

    AERCO representative be contacted. For descriptions of temperature-related functions and their factory defaults, see Appendices A and E. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 66 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 67: Setting The Setpoint

    Boiler Mode Remote Setpoint Remote Signal 4-20mA/1-5V, 0-20mA/0-5V, or Network Refer to section 3.3 for detailed instructions on changing menu options. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 67 of 207 Ph.: 800-526-0288 GF-137...

  • Page 68: Remote Setpoint Field Wiring

    While it is possible to change the settings of temperature related functions, the unit is factory preset with settings that work well in most applications. It is suggested that an AERCO representative be contacted, prior to changing any temperature related function settings. For descriptions of temperature-related functions and their factory defaults, refer to Appendices A and E.

  • Page 69: Direct Drive Field Wiring

    To change back to the Direct Drive mode, simply press the AUTO/MAN switch. The REMOTE LED will again light and the MANUAL LED will go off. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 69 of 207 Ph.: 800-526-0288...

  • Page 70: Aerco Control System (Acs)

    485 signaling to the boiler. Installations with 1 to 8 boilers can use BST (see Chapter 9). The ACS mode of operation is used in conjunction with an AERCO Control System. The ACS mode is used when it is desired to operate multiple units in the most efficient manner possible.

  • Page 71: Combination Control System (Ccs)

    Only the AERCO Control System (ACS) is necessary to configure this system if only a single valve is used to switch from space heating to domestic hot water. However, the ACS Relay...

  • Page 72: Combination Control System Field Wiring

    These default settings work well in most applications. It is suggested that AERCO be contacted prior to changing settings other than the unit’s setpoint. For a complete listing of temperature related function defaults, see Appendix D.

  • Page 73: Chapter 6. Safety Device Testing

    AND 24 VOLTS AC. Power must be removed prior to performing wire removal or other test procedures that can result in electrical shock. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 73 of 207 Ph.: 800-526-0288...

  • Page 74: Low Gas Pressure Fault Test

    LOW GAS PRESSURE FAULT TEST LOW GAS BALL VALVE BMK 3000: Figure 6-1b: Low Gas Pressure Test AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 74 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 75: High Gas Pressure Test

    5. While the unit is firing, slowly close the external manual gas shut-off valve. 6. The unit should shut down and display a GAS PRESSURE fault message at approximately: 3.6” W.C. (897 Pa) for BMK 2500 and 2.6” W.C. (648 Pa) for BMK 3000.
  • Page 76 7. The unit should shut down and display a HIGH GAS PRESSURE fault message when the gas pressure exceeds 2.6” W.C. (648 Pa) for BMK 2500 and 3.5” W.C. (872 Pa) for BMK 3000. The FAULT indicator should also start flashing.

  • Page 77: Low Water Level Fault Test

    11. Press the CLEAR button to reset the FAULT LED and clear the displayed error message. 12. Set the ON/OFF switch to the ON position. The unit is now ready for operation. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 77 of 207 Ph.: 800-526-0288...

  • Page 78: Water Temperature Fault Test

    LIMIT DIGITAL CONTROLLER ADJUSTABLE TEMPERATURE LIMIT SWITCH MANUAL SWITCH RESET BUTTON MANUAL TEMPERATURE LIMIT SWITCH Figure 6-3: Temperature Limit Switch Location AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 78 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 79: Interlock Tests

    5. Reconnect the wire or jumper removed in step 3 to restore the interlock. 6. Press the CLEAR button to reset the fault 7. The unit should start. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 79 of 207 Ph.: 800-526-0288...

  • Page 80: Flame Fault Tests

    9. The unit should shut down and Lockout, flashing FLDR in the display. 10. Open the valve previously closed in step 8. 11. Press the CLEAR button. The unit should restart and fire. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 80 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 81 Figure 6-4: Bare Boiler – Partial View (BMK 2500 Shown) NOTE The BMK 2500 bare boiler image in Figure 6-4 may be used to refer to the BMK 3000 model as well. Both units are virtually identical except for the position of the High Gas Pressure switch on the gas train and the burner size.

  • Page 82: Air Flow Fault Tests

    (see Figure 6-6, below). For units that have an air filter in place of a Combustion Air Duct (not shown), remove the air filter. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 82 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 83 9. Remove the jumper wires installed in step 2 and replace the black connector boot on the Flame Detector. 10. Press the CLEAR button. The unit should restart. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 83 of 207 Ph.: 800-526-0288...

  • Page 84: Ssov Proof Of Closure Switch

    10. The unit should shut down and display SSOV FAULT DURING PURGE. 11. Replace the wire on the SSOV and press the CLEAR button. The unit should restart. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 84 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 85: Purge Switch Open During Purge

    6. The unit should begin its start sequence, then shut down and display PRG SWITCH OPEN DURING PURGE. 7. Replace the wire on the Purge switch and depress the CLEAR button. The unit should restart. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 85 of 207 Ph.: 800-526-0288...

  • Page 86: Ignition Switch Open During Ignition

    PROOF SWITCH AIR/FUEL VALVE COVER (Rotate Counter-Clock-Wise to Remove) AIR/FUEL VALVE BLOCKED INLET SWITCH Figure 6-8: Air/Fuel Valve Cover Location AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 86 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 87: Safety Pressure Relief Valve Test

    6.12 SAFETY PRESSURE RELIEF VALVE TEST Test the safety Pressure Relief Valve in accordance with ASME Boiler and Pressure Vessel Code, Section VI. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 87 of 207 Ph.: 800-526-0288...
  • Page 88 Benchmark 2500 - 3000 Boilers CHAPTER 6 – SAFETY DEVICE TESTING (This Page Is Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 88 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 89: Chapter 7. Maintenance

    Replace Gaskets Air Filter Clean Replace 15 mins. (P/N 88014) * Only performed after initial 6 month period after initial startup. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 89 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 90: Igniter-Injector

    2. Remove the top shroud from the unit by grasping the top handle and lifting straight up. This will disengage the shroud from the four (4) pins in the side panels. 3. Disconnect the cable from the igniter-injector (Figure 7-1). AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 90 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 91 Chapter 4 for combustion calibration procedures. 9. Prior to reinstalling the igniter-injector, a high temperature, conductive, anti-seize com- pound must be applied to the threads. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 91 of 207 Ph.: 800-526-0288...

  • Page 92: Flame Detector

    2. Remove the top shroud from the unit by grasping the top handle and lifting straight up. This will disengage the shroud from the four (4) pins in the side panels. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 92 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 93: O 2 Sensor

    Test schedules must conform to local jurisdictions. The results of the tests should be recorded in a log book. See Chapter 6- Safety Device Testing Procedures. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 93 of 207 Ph.: 800-526-0288...

  • Page 94: Burner Assembly Inspection

    13. Remove the burner by pulling straight up. 14. Remove and replace the burner gasket(s) (see Figure 7-5). NOTE The burner assembly weighs approximately 65 lbs. (29.5 kg). AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 94 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...
  • Page 95 (8 each) 1/2” NUTS & BOLTS (4 each) FILTER GAS TRAIN Figure 7-4a: Burner Assembly Mounting Details (BMK 2500 Shown) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 95 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 96 CHAPTER 7 – MAINTENANCE Burner Assembly Inspection and Maintenance Procedures – Continued NOTE The BMK 2500 and BMK 3000 units are nearly identical except for the position of the High Gas Pressure switch on the gas train and the burner size. 3/8”-16 BLOWER...

  • Page 97: Condensate Drain Trap

    INLET Float 3/4" NPT Port O-Rings OUTLET CROSS-SECTION EXPLODED VIEW Figure 7-6: External Condensate Trap – Cross-Section & Exploded View AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 97 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 98: Air Filter Cleaning & Replacement

    7. Replace the top shroud on the unit and return boiler to service use. AIR/FUEL VALVE AIR FILTER MANUAL HOSE CLAMP SHUT-OFF VALVE TRAIN FILTER Figure 7-7: Air Filter Location AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 98 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 99: Water Cutoff (Lwco) Capacitor Integrity Test

    Serious personal injury or death may occur if this warning is not observed. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 99 of 207 Ph.: 800-526-0288...
  • Page 100 Ohmmeter 19-Pin Shell Harness Cable Connector LWCO Probe Assembly Connector Figure 7-10: Connecting Ohmmeter between LWCO Probe & Shell Harness Cable AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 100 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...

  • Page 101: Low Water Cutoff (Lwco) - Standard C-More Test

    4. Close external gas supply valve. 5. Open relief valve to vent water pressure. Open the drain valve and drain all water from the unit. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 101 of 207 Ph.: 800-526-0288...

  • Page 102: Placing The Boiler Back In Service After A Prolonged Shutdown

    I/O board’s Spark Signal terminals, red wire to the positive (+) terminal and black to negative (-). AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 102 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 103 Benchmark 2500 - 3000 Boilers CHAPTER 7 – MAINTENANCE (This page left intentionally blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 103 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 105: Chapter 8. Troubleshooting Guide

    The front panel of the C-More Control Box contains an RS232 port. This port is used only by factory-trained personnel to monitor OnAER communications via a portable computer. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 105 of 207 Ph.: 800-526-0288...
  • Page 106 Benchmark 2500 - 3000 Boilers CHAPTER 8 – TROUBLESHOOTING GUIDE (This page left intentionally blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 106 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 107 Air/Fuel Valve dial. Check igniter-injector for soot or erosion of electrode. Check Hard light. injector solenoid valve to insure proper open/close operation. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 107 of 207 Ph.: 800-526-0288...
  • Page 108 Probable causes from 3 to 16 for See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW AIRFLOW FAULT DURING FAULT DURING IGNITION. IGNITION applies for this fault. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 108 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...
  • Page 109 If 120VAC is not present, the IGST board in the Control Box may be defective. Refer fault to qualified service personnel. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 109 of 207 Ph.: 800-526-0288...
  • Page 110 If exhaust temperature is greater than 200 F (93.3 TEMPERATURE incorrect combustion calibration. check combustion calibration. Calibrate or repair as necessary. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 110 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 111 Press CLEAR button and restart unit. If fault persists, contact IGN BOARD between the PMC board and qualified Service Personnel. COMM FAULT Ignition/Stepper (IGST) board. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 111 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 112 Defective IGST Board. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace IGST Board. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 112 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 113 Measure gas pressure at the Low Gas Pressure switch. If it is greater switch. than 3.6” W.C. (897 Pa) for BMK 2500 or 2.6” W.C. (648 Pa) for BMK 3000, measure continuity across the switch and replace if necessary. Insufficient water level in system.
  • Page 114 O2 % OUT OF RANGE Blocked inlet air duct or louver. Unblock air inlet and measure open area for combustion air to the room. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 114 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 115 Hot and Neutral reversed at SSOV. Check SSOV power wiring. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 115 of 207 Ph.: 800-526-0288...
  • Page 116 Defective IGST Board. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace IGST Board. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 116 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 117: Additional Faults Without Specific Fault Messages

    Check to ensure that the IGST and Power Supply Boards Air/Fuel Valve “hunting” at in Control Box are outdated. are Rev. E or higher. the 80% Valve Position AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 117 of 207 Ph.: 800-526-0288 GF-137...
  • Page 118 Benchmark 2500 - 3000 Boilers CHAPTER 8 – TROUBLESHOOTING GUIDE (This Page Is Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 118 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 119 DAMPING ORIFICE BRASS HEX HEAD Remove to access the Gas Pressure Adjustment Screw Figure 8-2: SSOV Actuator With Gas Pressure Adjustment AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 119 of 207 Ph.: 800-526-0288 GF-137...
  • Page 120 Benchmark 2500 - 3000 Boilers CHAPTER 8 – TROUBLESHOOTING GUIDE (This Page Is Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 120 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 121: Chapter 9. Boiler Sequencing Technology

    A simplified block diagram of multiple Boilers connected to a BST is shown in Figure 9-1 below. Figure 9-1. Simplified BST Block Diagram AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 121 of 207 Ph.: 800-526-0288...

  • Page 122: Installation Notes

    ProtoNode installed. Set the BST system for desired mode of operation (Setpoint Mode). Test the system completely with the ProtoNode installed. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 122 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 123: Aerco Bst Quick Start Chart

    Option 7 – 4-20ma Drive AND Modbus Header Complete section 9.3.7 Option 8 – Modbus Drive AND Modbus Header Complete section 9.3.8 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 123 of 207 Ph.: 800-526-0288...

  • Page 124: Bst Implementation Instruction

    When ALL C-More units have been configured: 7. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 124 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 125: Option 2 - Constant Setpoint With Modbus Wired Header Sensor

    When ALL C-More units have been configured: 9. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 125 of 207 Ph.: 800-526-0288...

  • Page 126: Option 3 - Outdoor Reset With Direct Wired Header Sensor And Direct Wired Outdoor Sensor

    The outdoor sensor may be wired up to 200 feet (61m) from the boiler. Temp Sensor PN 123525 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 126 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 127 When ALL C-More units have been configured: 9. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 127 of 207 Ph.: 800-526-0288...

  • Page 128: Option 4 - Outdoor Reset With Modbus Header Sensor And Modbus Outdoor Sensor

    The sensor must be shielded from direct sunlight as well as impingement by the elements. The outdoor sensor may be wired up to 200 feet (61m) from the boiler. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 128 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 129 When ALL C-More units have been configured: 13. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 129 of 207 Ph.: 800-526-0288...

  • Page 130: Option 5 - Remote Setpoint With Direct Wired Header Sensor And 4-20Ma Setpoint Drive

    Shielded pair 18 - 22 AWG cable is recommended for this connection. Polarity must be observed. • The ground for the shield is at the driver signal source. I/O Box AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 130 of 207 OMM-0094_0F Ph.: 800-526-0288...
  • Page 131 When ALL C-More units have been configured: 8. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 131 of 207 Ph.: 800-526-0288...

  • Page 132: Option 6 - Remote Setpoint With Direct Wired Header Sensor And Modbus Setpoint Drive

    Header Temp Sensor I/O Box Step 2: Remote Setpoint with Network 1. Configure and Connect the SSD Device (ProtoNode) per the AERCO Manual (GF129). Step 3: Configure ALL C-More Units On ALL Boilers: 1. Go to the Configuration menu item and set the BST Menu item to Enabled.

  • Page 133: Option 7 - Remote Setpoint With Modbus Header Sensor And 4-20Ma Setpoint Drive

    Unit’s I/O Box. Shielded pair 18 - 22 AWG cable is recommended for this connection. Polarity must be observed. • The ground for the shield is at the driver signal source. I/O Box AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 133 of 207 Ph.: 800-526-0288 GF-137...
  • Page 134 When ALL C-More units have been configured: 10. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 134 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 135: Option 8 - Remote Setpoint With Modbus Header Sensor And Modbus Setpoint Drive

    Temp Sensor PN 24410 Modbus Transmitter I/O Box Step 2: Remote Setpoint with Network 1. Configure and Connect the SSD Device (ProtoNode) per the AERCO Manual (GF129). AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 135 of 207 Ph.: 800-526-0288...
  • Page 136 When ALL C-More units have been configured: 10. Go to the Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to BST MASTER. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 136 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 137: Appendix A: Boiler Menu Item Descriptions

    Displays the total number of run cycles. Run Hours Displays total run time of unit in hours. Fault Log Displays information on the last 20 faults. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 137 of 207 Ph.: 800-526-0288 GF-137...

  • Page 138: Table A-2: Setup Menu Item Descriptions

    4-digit serial # on the Code Plate, e.g., G-12-1234. Software Version Identifies the current software version of the control box. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 138 of 207 OMM-0094_0F Ph.: 800-526-0288...

  • Page 139: Table A-3: Configuration Menu Item Descriptions

    Specifies the amount of time, up to 30 minutes, to keep the Pump Delay Timer pump running after the unit turns off. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 139 of 207 Ph.: 800-526-0288...
  • Page 140 Allows the Failsafe mode to be set to either Constant Setpoint Failsafe Mode or Shutdown. Must be set to Valve Pos 0-10V for BMK 2500 and BMK 3000. Analog Output DO NOT CHANGE from its default value. Specifies how long, from 2 to 600 seconds, to remain in the low Lo Fire Timer fire position after ignition, before going to the desired output.
  • Page 141 Spark Monitor Spark Current Disabled on Benchmark 2500 and 3000. BST Menu When set to Enabled, the BST menu options appears. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 141 of 207 Ph.: 800-526-0288 GF-137...

  • Page 142: Table A-4: Tuning Menu Item Descriptions

    Range = 0 - 240 seconds Default = 20 seconds Reset Defaults? Allows Tuning menu options to be reset to their Factory Default values. AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 142 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...

  • Page 143: Table A-5: Combustion Calibration Menu Item Descriptions

    Permits the Standby Voltage to be set from 0 to 4.00 Volts. Permits the combustion oxygen level to be displayed (0% to Oxygen Level 25%) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 143 of 207 Ph.: 800-526-0288...
  • Page 144 Benchmark 2500 - 3000 Boilers APPENDIX A: BOILER MENU DESCRIPTIONS This Page Is Intentionally Blank AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 144 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 145: Appendix B: Startup, Status & Display Messages

    The time and date are also displayed. WAIT Prompts the operator to wait. WARMUP Displayed for 2 minutes during the initial warm-up only. XX sec AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 145 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 146 The Line (Hot) and Neutral wires are reversed. OUT OF PHASE LOW GAS The Low Gas Pressure Limit switch is open. PRESSURE AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 146 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015...
  • Page 147 A failure has been detected in one of the relays that control the SSOV. FAILURE STEPPER MOTOR The Stepper Motor failed to move the Air/Fuel Valve to the desired position. FAILURE AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 147 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 148 Benchmark 2500 - 3000 Boilers APPENDIX B: STARTUP, STATUS & DISPLAY MESSAGES This Page Is Intentionally Blank AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 148 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 149: Appendix C: Sensor Resistance/Voltage Chart

    1260.0 2.47 87.8 1285.6 2.50 93.3 1311.4 2.52 98.9 1337.7 2.54 104.4 1364.2 2.56 1391.0 2.58 115.6 1418.2 121.1 1445.7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 149 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 150 Benchmark 2500 - 3000 Boilers APPENDIX C: SENSOR RESISTTANCE/VOLTAGE CHART This Page Is Intentionally Blank AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 150 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 151: Appendix D: Recommended Periodic Testing

    See section 7.7 Annually Verify oxygen level is between 3% and 8% during Oxygen (O ) Level Monthly Operator boiler operation AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 151 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 152 Benchmark 2500 - 3000 Boilers APPENDIX D: RECOMMENDED PERIODIC TESTING (This page intentionally blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 152 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 153: Appendix E: Indoor/Outdoor Reset Ratio Charts

    RESET RATIO Air Temp °F °C 15.6 12.8 10.0 -1.1 -3.9 -6.7 -9.4 -12.2 -15.0 -17.8 -20.6 -23.3 -26.1 -28.9 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 153 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 154 Air Temp °F °C 21.1 18.3 15.6 12.8 10.0 -1.1 -3.9 -6.7 -9.4 -12.2 -15.0 -17.8 -20.6 -23.3 -26.1 -28.9 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 154 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 155 Air Temp °F °C 26.7 23.9 21.1 18.3 15.6 12.8 10.0 -1.1 -3.9 -6.7 -9.4 -12.2 -15.0 -17.8 -20.6 -23.3 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 155 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 156 Air Temp °F °C 32.2 29.4 26.7 23.9 21.1 18.3 15.6 12.8 10.0 -1.1 -3.9 -6.7 -9.4 -12.2 -15.0 -17.8 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 156 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 157: Appendix F: Dimensional Drawing

    Benchmark 2500 - 3000 Boilers APPENDIX F: DIMENSIONAL DRAWING APPENDIX F: DIMENSIONAL DRAWING Drawing Number: AP-A-900 rev C AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 157 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...

  • Page 158: Appendix G: Clearance Drawings

    Benchmark 2500 - 3000 Boilers APPENDIX F: CLEARANCE DRAWINGS APPENDIX G: CLEARANCE DRAWINGS Drawing Number: SD-A-898 rev C AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 158 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 159: Appendix H: Parts List Drawings

    Benchmark 2500 - 3000 Part List 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 1 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 159 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 160 Benchmark 2500 - 3000 Part List 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 2 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 160 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 161 Benchmark 2500 - 3000 Part List 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 3 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 161 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 162 Benchmark 2500 - 3000 Part List 02/10/2014 AERCO International, Inc. Whole Boiler 28536-1 – 28382-1 Sheet 4 of 7 Blauvelt, NY 10913 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 162 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 163 Benchmark 2500 - 3000 Part List 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 5 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 163 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 164 Benchmark 2500 - 3000 Part List 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 6 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 164 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 165 Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Blauvelt, NY 10913 Whole Boiler 28536-1 – 28382-1 Sheet 7 of 7 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 165 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 166 PRESSURE SWITCH: 2.6" W.C. FALL N.O. AERCO Benchmark 3000 Gas Train 09/22/2015 International, Inc. Blauvelt, NY 10913 P/N 22171 rev G Sheet 1 of 1 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 166 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 167 Benchmark 3000 DBB Natural Gas Gas Train 08/20/2014 International, Inc. Blauvelt, NY 10913 22173 rev H Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 167 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 168 Benchmark 2500 - 3000 Boilers APPENDIX H: PARTS LIST DRAWINGS BMK 2500 FM Gas Train BOM – P/N 22190 rev B Item Description 123542 FLANGE 2" 125# 2"NPT 93069 BUSHING: REDUCING 1-1/2" TO 2" NPT 94060-2 NIPPLE: 1-1/2" NPT X 2.00 LG...
  • Page 169 Benchmark 2500 FM Gas Train AERCO 10/31/2013 International, Inc. Blauvelt, NY 10913 22190 – rev B Page 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 169 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 170 Benchmark 2500 Natural Gas DBB Gas Train 09/04/2014 International, Inc. Blauvelt, NY 10913 22211 rev C Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 170 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 171: Appendix I: C-More Wiring Diagrams

    Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68040 rev F Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 171 of 207 Ph.: 800-526-0288 GF-137...
  • Page 172 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 172 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 173 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68040 rev F Sheet 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 173 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 174 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 174 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 175 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68041 rev F Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 175 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 176 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 176 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 177 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68041 rev E Sheet 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 177 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 178 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 178 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 179 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68060 rev C Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 179 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 180 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 180 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 181 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68060 rev C Sheet 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 181 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 182 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 182 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 183 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68062 rev C Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 183 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 184 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 184 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 185 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68062 rev C Sheet 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 185 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 186 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 186 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 187 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68063 rev B Sheet 1 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 187 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 188 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 188 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 189 Benchmark 2500 - 3000 Boilers APPENDIX I: C-MORE WIRING DIAGRAMS Drawing Number: 68063 rev B Sheet 2 of 2 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 189 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 190 Benchmark 2500 - 3000 Boilers APPENDIX I – C-MORE WIRING DIAGRAMS (This Page Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 190 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 191: Appendix J: Piping Drawings

    Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-957 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 191 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 192 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-958 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 192 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 193 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-959 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 193 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 194 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-960 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 194 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 195 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-961 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 195 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 196 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-962 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 196 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 197 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS Drawing Number: SD-A-963 rev A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 197 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 198 Benchmark 2500 - 3000 Boilers APPENDIX J: PIPING DRAWINGS (This page intentionally blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 198 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 199: Appendix K: C-More Control Panel Views

    P/N 124949 SWITCHES P/N 124954 VERTICAL OVERLAY, BENCHMARK P/N 124718 Figure K-1 – Benchmark Series Control Panel - Exploded View AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 199 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 200 EXT. SENSOR/COMM HARNESS CONNECTOR (24 PIN) TO INPUT/OUTPUT (I/O) BOX SENSOR HARNESS CONNECTOR (7 PIN) Figure K-2: Benchmark Control Panel Rear View AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 200 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 201: Appendix L: Recommended Spares

    Table L-3: Optional Spare Parts DESCRIPTION PART NUMBER C-More Control Box 181197 BMK 2500: 46039 Burner BMK 3000: 46038 Lean Oxygen Sensor 61026 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 201 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 202 Benchmark 2500 - 3000 Boilers APPENDIX L: RECOMMENDED SPARES (This Page Is Intentionally Blank) AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 202 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...

  • Page 203: Appendix M: Korean Gas Trains

    • 22215 – Benchmark 3000 • 22244 – Benchmark 2500 Figure M-1: Gas Train Schematic, P/N 22215 and P/N 22244 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 203 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 204 AERCO Benchmark 3000 Gas Train (Korea) 09/07/2015 International, Inc. Blauvelt, NY 10913 P/N 22215 rev D Sheet 1 of 1 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 204 of 207 OMM-0094_0F Ph.: 800-526-0288 09/30/2015 GF-137...
  • Page 205 AERCO Benchmark 2500 Gas Train (Korea) 09/07/2015 International, Inc. Blauvelt, NY 10913 P/N 22244 rev A Sheet 1 of 1 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0F Page 205 of 207 Ph.: 800-526-0288 GF-137 09/30/2015...
  • Page 207 1094: Replaced Tridicator P/N 69087-TAB with 123675-TAB. 934-145: Warranty pages removed. Warranty information for all BMK units is now included in a new stand-alone document, All Benchmark Limited Warranty, posted on the AERCO web site. 934-150: Clarified references to & function of spark monitor (p/n 61034) (or AC current transducer) in section 2.10.4, added new section 7.13 Spark Monitor...

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