Am series
natural gas & propane modulating condensing boilers & water heaters (154 pages)
Summary of Contents for Aerco BMK 2500
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• BMK 2500 2500 / 3000 • BMK 3000 Gas-Fired Boilers Applicable to Serial Numbers: G-14-0304 and Above Latest Update: 03/20/2014 Page 1 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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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. AERCO International is not liable for errors appearing in this manual.
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: Input Range (BTU/hr.) Output Range (BTU/hr.)
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British Thermal Unit. A unit of energy approximately equal to the heat required to raise 1 pound of water 1° F. Combustion Control Panel C-More Controller A control system developed by AERCO and currently used in all (or Control Box) Benchmark, Innovation and KC1000 Series product lines. Carbon Monoxide...
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A standard for serial, half-duplex (HDX) transmission of data based on (or EIA-485) the RS-485 Standard RTN (Rtn) Return SETPT (Setpt) Setpoint Temperature SHLD (Shld) Shield Page 9 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Microamp (0.000001 amp), one millionth of an amp Volts, Alternating Current Volts, Direct Current Vacuum Fluorescent Display, or Variable Frequency Drive Watt W.C. Water Column (W.C.) Page 10 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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.
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.
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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: Page 13 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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____________________________________________________________________________ [End of Extracted Information From 248 CMR 5.08 (2)] Page 14 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
2.1 INTRODUCTION This Chapter provides the descriptions and procedures necessary to unpack, inspect and install the AERCO Benchmark Boiler Model 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.
Three-Phase, 60 Hz @ 5 Amps • Access to Natural Gas line at a minimum pressure of 8 inches W.C. at gas flow for 2,500,000 BTU/hr energy input for the BMK 2500 OR 3,000,000 BTU/hr energy input for the BMK 3000.
A total of 3 lifting lugs are provided at the top of the primary heat exchanger as shown in Figure 2-2. Remove the front top panel from the unit to provide access to the lifting tabs. Page 17 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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Combination Mode Boilers in advance and place them in the proper physical location. Refer to Chapter 5 for information on Combination Mode Boilers. Page 18 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
In multiple unit installations the discharge lines must not be manifolded together. Each must be individually run to a suitable discharge location. Page 19 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
• The base of the condensate trap must be supported to ensure that it is level (horizontal). • The trap must be removable for routine maintenance. Page 20 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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...
It is the responsibility of the customer to source and purchase the appropriate gas regulator as described above. 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. Page 23 of 204 AERCO International, Inc.
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.
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). Page 25 of 204 AERCO International, Inc.
DO NOT make any connections to the I/O Box terminals labeled “NOT USED”. Attempting to do so may cause equipment damage. Page 26 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
“to view only” input that can be seen in the operating menu. The sensor is an AERCO BALCO wire sensor P/N 12449. A resistance chart for this sensor is Page 27 of 204 AERCO International, Inc.
(BMS), which utilize a 12 millisecond, ON/OFF duty cycle and is Pulse Width Modulated (PWM) to control valve position. A 0% valve position = a 5% ON pulse and a 100% valve position = a 95% ON pulse. Note that these connections cannot be used with the AERCO Control System (ACS).
2.10.9 RS-485 Comm (+, GND, & -) The RS-485 communication terminals are used when the boiler plant is being controlled by an Energy Management System (EMS) or an AERCO Control System (ACS) using Modbus (RS- 485) communication. 2.10.10 RS-232 Comm (TxD & RxD) The RS-232 communication terminals permit a laptop computer or other suitable terminal to be connected to the boiler.
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.
In a ducted combustion air application, the combustion air ducting pressure losses must be taken into account when calculating the total maximum allowable venting run. See the AERCO Benchmark Venting and Combustion Air Guide, GF-2050. When using the heater in a ducted combustion air configuration, each unit must have a minimum 8 inch diameter connection at the unit.
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Figure 2-14: Sequencing Valve Installed Remove the jumper wire from the Molex connector and then plug it into the sequencing valve’s connector. Page 32 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
Table 3-1. Additional information on these items is provided in the individual operating procedures and menu descriptions provided in this Chapter. Page 33 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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DB9 connector for connection to older computers with serial ports or can be used with a Serial-to-USB adaptor for use in modern computer USB ports. Page 34 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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Low Water Level alarm. TEST/RESET Switches Pressing RESET resets the water level monitor circuit. Pressing the CLEAR key (item 6) resets the display. Page 35 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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20 segment red LED bargraph continuously shows the Air/Fuel VALVE POSITION Valve position in 5% increments from 0 to 100% Bargraph Page 36 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
The menu option choices do not wrap around. 7. To select and store a changed menu item, press the ENTER key. Page 37 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Refer to Appendix B for listings and descriptions of displayed startup, status and error messages. Page 38 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
RS-232 port. A view-only software version display is also provided to indicate the current Control Box software version. Page 39 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
Set in accordance with the requirements specified for each individual order. Therefore, under normal operating conditions, no changes will be required. Page 40 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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*NOTE The Bldg Ref Temp and Reset Ratio Menu Items are only displayed when the Outdoor Sensor is set to “Enabled”. Page 41 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
Warmup Int Gain 2.00 0.50 Warmup PID timer 0 sec. 240 sec. 20 sec. Reset Defaults? Yes, No, Are You Sure? Page 42 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
These displayed item groups are displayed in UPPER CASE letters, and are bounded by an asterisk * in order to readily identify them within the item list. Page 43 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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Boiler Shutdown System Shutdown Shutdown On-Outlet One Boiler Mode On-Avg Temp Temp 1 Blr Threshold Setpoint Setback Disable Enable Disable Page 44 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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*BST COMM MENU* Disabled Enabled Disabled Comm Address BST Min Addr BST Max Addr SSD Address SSD Poll Control 1000 Page 45 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
The unit checks to ensure that the Proof of Closure (POC) switch in the downstream Safety Shut-Off Valve (SSOV) is closed. See Figure 3-3 for SSOV location. Page 46 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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The Air/Fuel Valve rotates to the full-open purge position and closes purge position switch. The dial on the Air/Fuel Valve (Figure 3-4) will read 100 to indicate that it is full-open (100%). Page 47 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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The Dial on the Air/Fuel Valve (Figure 3-6) will read between 25 and 35 to indicate that the valve is in the low fire position. Page 48 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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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. Page 49 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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 at: AERCO International, Inc. 100 Oritani Drive...
VALVE LOW GAS PRESSURE MANUAL SWITCH SHUT-OFF VALVE Figure 4-1a: BMK 2500: 1/4 Inch Gas Plug Location for Combustion Calibration Page 52 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Install a NPT-to-barbed fitting into the tapped plug port. Attach one end of the plastic tubing to the barbed fitting and the other end to the 16” W.C. manometer. Page 53 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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.
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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 Page 55 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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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. Page 56 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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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).
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(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. Page 58 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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), nitrogen oxide (NOx) and carbon monoxide (CO) should remain within the same limits for all valve positions as shown in the following table. Page 59 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
6. Replace all previously removed sheet metal enclosures on the unit. 7. This concludes reassembly of the unit after combustion calibration. Page 60 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
Figure 4-6 and Table 4-1. Alarm Limit Control Figure 4-6: Digital Over-Temperature Alarm Switch Front Panel Page 61 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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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. 7. Press the SET button again to enter the code. The first parameter label (SP) will appear in the display.
Startup in the Indoor/Outdoor Reset Mode is accomplished as follows: NOTE A design engineer typically provides design outdoor air temperature and supply header temperature data Page 63 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
Select desired setpoint using ▲ and ▼ arrow keys (40°F to 240°F) Internal Setpt Refer to section 3.3 for detailed instructions on changing menu options. Page 64 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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.
If the Network setting is selected for RS-485 Modbus operation, a valid Comm Address must be entered in the Setup Menu. Refer to Modbus Communication Manual GF-114 for additional information. Page 66 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
485 signaling to the boiler. Installations with 1 to 8 boilers can use BST (see Chapter 10). 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.
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...
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.
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Benchmark 2500 - 3000 Boilers CHAPTER 5 – MODE OF OPERATION (This Page Is Intentionally Blank) Page 70 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
230 OR 460, 120 AND 24 VOLTS AC. POWER MUST BE REMOVED PRIOR TO PERFORMING WIRE REMOVAL OR OTHER TEST PROCEDURES THAT RESULT ELECTRICAL SHOCK. Page 71 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
LOW GAS PRESSURE FAULT TEST LOW GAS BALL VALVE Figure 6-1b: BMK 3000: Low Gas Pressure Test Page 72 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
6. The unit should shut down and display a GAS PRESSURE fault message at approximately: 3.6” W.C. for for BMK 2500 and 2.6” W.C. for BMK 3000. 7. Fully open the external manual gas shut-off valve and press the CLEAR button on the Control Box.
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FAULT indicator should also start flashing. 8. Reduce the gas pressure back to the value recorded in step 5. This pressure should be within the range of 2.0” W.C., ± 0.2” W.C. for BMK 2500 and 2.3” W.C. ± 0.2” W.C. for BMK 3000.
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. Page 75 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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. Page 77 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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. Page 78 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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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.
(see Figure 6.5, below). For units that have an air filter in place of a Combustion Air Duct (not shown), remove the air filter. Page 80 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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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. Page 81 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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. Page 82 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
OPEN DURING PURGE. 6. Replace the wire on the Purge Switch and depress the CLEAR button. The unit should restart. Page 83 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
6.12 SAFETY PRESSURE RELIEF VALVE TEST Test the safety Pressure Relief Valve in accordance with ASME Boiler and Pressure Vessel Code, Section VI. Page 85 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Benchmark 2500 - 3000 Boilers CHAPTER 6 – SAFETY DEVICE TESTING (This Page Is Intentionally Blank) Page 86 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
Replace Gaskets Air Filter (88014) Clean Replace 15 mins. * Only performed after initial 6 month period after initial startup. Page 87 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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). Page 88 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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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. Page 89 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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.>>> Page 90 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
The results of the tests should be recorded in a log book. See Chapter 6- Safety Device Testing Procedures. Page 91 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
10. Loosen and remove the four 5/16x1-3/4” bolts, washers, and nuts from the burner plenum where it is attached to the blower (see Figure 7-4a & 7-4b). Page 92 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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16. Ensure that the igniter-injector and flame detector cutouts in the burner plate are properly aligned with the heat exchanger top flange. Page 93 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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Figure 7-4a: Burner Assembly Mounting Details (BMK 2500 Shown) NOTE The BMK 2500 bare boiler image in Figure 7-4a and 7-4b may be used to refer to the BMK 3000 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.
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81185 – LOWER RELEASE GASKET BARE BURNER INSTALLED IN HEAT EXCHANGER ASSY. Figure 7-5: Bare Burner and Replacement Gaskets Location Page 95 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
4. Remove the float from the condensate trap. 5. Remove the O-ring and orifice gaskets from the trap. AERCO recommends that these items be replaced annually. 6. Thoroughly clean the trap and float. Also inspect the drain piping for blockage. If the trap cannot be thoroughly cleaned, replace the trap.
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 Page 97 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
4. Perform initial startup per Chapter 4. 5. Perform safety device testing and scheduled maintenance procedures per Chapters 6 and 7 of this manual. Page 98 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
If the fault cannot be corrected using the information provided in the Troubleshooting Tables, contact your local AERCO Representative. Page 99 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Benchmark 2500 - 3000 Boilers CHAPTER 8 – TROUBLESHOOTING GUIDE (This page left intentionally blank) Page 100 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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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. Page 101 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW AIRFLOW FAULT DURING FAULT DURING IGNITION. IGNITION applies for this fault. Page 102 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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If 120VAC is not present, the IGST board in the Control Box may be defective. Refer fault to qualified service personnel. Page 103 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Carboned heat exchanger due to If exhaust temperature is greater than 200 F, check incorrect combustion calibration. combustion calibration. Calibrate or repair as necessary. Page 104 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Press CLEAR button and restart unit. If fault persists, contact Communication fault has occurred IGN BOARD between the PMC board and qualified Service Personnel. COMM FAULT Ignition/Stepper (IGST) board. Page 105 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Defective IGST Board. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace IGST Board. Page 106 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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PRESSURE Defective Low Pressure Gas Measure gas pressure at the low gas pressure switch. If it is greater than 3.6” W.C. for BMK 2500 and 2.6” W.C. for BMK 3000, Switch. measure continuity across the switch and replace if necessary.
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O2 % OUT OF RANGE Blocked inlet air duct or louver. Unblock air inlet and measure open area for combustion air to the room. Page 108 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Check SSOV power wiring. Hot and Neutral reversed at SSOV. Page 109 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Defective IGST Board. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace IGST Board. Page 110 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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 Page 111 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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DAMPING ORIFICE BRASS HEX HEAD (Remove to access the Gas Pressure Adjustment Screw). Figure 8-2: SSOV Actuator With Gas Pressure Adjustment Page 112 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
(if your computer has more than one) and what speed (baud rate) to use when transferring data. For further configuration options (data bits, stop bits, parity, Page 113 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
Figure 9-2: PuTTY GUI: Basic SSH Options for Running Remote Commands Into the textbox titled, Remote command type the full command line you wish to have executed on the remote machine. Page 114 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
At the prompt, enter the valid RS-232 password (jaguar) in lower case letters and press Enter. “Welcome to Aerco” will appear in the laptop or “dumb terminal” display with a listing of the following available entry choices: M = Display next Menu...
Descriptions of these data logs are provided in the following sections. The procedure for accessing specific data log is described in section 9.3, step 10. Page 116 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
OPEN OPEN OPEN OPEN OPEN 1/15/02 5:16pm OPEN OPEN OPEN OPEN OPEN 1/15/02 5:11pm OPEN OPEN OPEN OPEN OPEN 1/15/02 5:06pm Page 118 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
A simplified block diagram of multiple Boilers connected to a BST is shown in Figure 9-1 below. Figure 10-1. Simplified BST Block Diagram Page 119 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
10.3.1 Option 1 - Constant Setpoint with DIRECT Wired Header Sensor Step 1: Direct Wired Header Sensor Wiring 1. On the MASTER Unit, Connect the Header Temperature Sensor (AERCO PN 61040) to the Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header Temp sensor”...
Step 1: MODbus Header Sensor Wiring 1. Using Shielded pair 18 - 22 AWG cable, connect the Temperature Transmitter (AERCO P/N 65169) terminal Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the Temperature Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
Manual, OMM-0032, GF-112 and ProtoNode User Manual, OMM-0080, GF-129 for more information. Step 1 - Direct Wired Header Sensor Wiring 1. On the MASTER Unit, connect the Header Temperature Sensor (AERCO PN 61040) to the Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header Temp sensor”...
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When ALL C-More units have been configured: 9. Go to the BST Menu of the desired Master unit and set the BST Mode item to BST MASTER. Page 124 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
Step 1 - Modbus Header Sensor Wiring 1. Using Shielded pair 18 - 22 AWG cable, connect the Temperature Transmitter (AERCO P/N 65169) terminal Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the Temperature Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
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When ALL C-More units have been configured: 13. Go to the BST Menu of the desired Master unit and set the BST Mode item to BST MASTER. Page 126 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
Manual, OMM-0032, GF-112 and ProtoNode User Manual, OMM-0080, GF-129 for more information. Step 1: Direct Wired Header Sensor Wiring 1. On the MASTER Unit, Connect the Header Temperature Sensor (AERCO PN 61040) to the Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header Temp sensor”...
Step 1: Direct Wired Header Sensor Wiring 1. On the MASTER Unit, Connect the Header Temperature Sensor (AERCO PN 61040) to the Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header Temp sensor” in the I/O Box.
Step 1: MODbus Header Sensor 1. Using Shielded pair 18 - 22 AWG cable, Connect the Temperature Transmitter (AERCO P/N 65169) terminal Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the Temperature Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
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When ALL C-More units have been configured: 9. Go to the BST Menu of the desired Master unit and set the BST Mode item to BST MASTER. Page 130 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
Step 1: MODbus Header Sensor 1. Using Shielded pair 18 - 22 AWG cable, Connect the Temperature Transmitter (AERCO P/N 65169) terminal Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the Temperature Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
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Benchmark 2500 - 3000 Boilers CHAPTER 10. BOILER SEQUENCING TECHNOLOGY (This Page Is Intentionally Blank) Page 132 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
Displays total run time of unit in hours from 0 to 9,999,999. Fault Log Displays information on the last 20 faults. Page 133 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Std, BMK Blr Std Dual, BMK Boiler LN, BMK Blr LN Dual, KC Water Heater, KC Wtr Heater LN, Innovation WH Page 134 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014...
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Specifies the amount of time (0 to 30 min.) to keep the pump running after the unit turns off. Default is zero. Page 135 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288...
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Allows the Failsafe mode to be set to either Constant Setpoint or Shutdown. Default is Shutdown. Analog Output Must be set to Valve Pos 0-10V for BMK 2500 & 3000. Lo Fire Timer Specifies how long (2 to 600 sec.) to remain in the low fire position after ignition, before going to the desired output.
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Sets the Fire Rate above which a boiler will trigger the Slow Shutdown feature. Span is 40% to 100%, Default is 60%. Page 137 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137...
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Range = 1-240 Default = 20 Reset Defaults? Allows Tuning Menu options to be reset to their Factory Default values. Page 138 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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 Page 139 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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The RS-485 network information is not present or is FAULT corrupted. % OUT OF RANGE % has gone below 3% or above 8%. Page 140 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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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 Page 141 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Boilers APPENDIX B: STARTUP, STATUS & DISPLAY MESSAGES This Page Is Intentionally Blank Page 142 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
Aux Start On Dly 0 sec Failsafe Mode Shutdown Valve Position 0-10V Analog Output CAUTION: DO NOT Change Lo Fire Timer 2 sec Page 145 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Hi DB Setpt En Demand Offset Deadband High Deadband Low Tuning Menu Prop Band 70°F Integral Gain 1.00 Derivative Time 0.0 min Page 146 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
Operator See section 7.7 Annually Oxygen (O ) Level Monthly Operator Verify oxygen level is between 3% and 8% during Page 147 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Boilers APPENDIX E: RECOMMENDED PERIODIC TESTING boiler operation (This page intentionally blank) Page 148 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
-10F -15F -20F Table F-2: Header Temperature for a Building Reference Temperature of 60F RESET RATIO Temp -10F -15F -20F Page 149 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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RESET RATIO Temp Table F-4: Header Temperature for a Building Reference Temperature of 70F RESET RATIO Temp -10F -15F -20F Page 150 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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RESET RATIO Temp -10F -15F Table F-6: Header Temperature for a Building Reference Temperature of 80F RESET RATIO Temp -10F Page 151 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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APPENDIX F: INDOOR/OUTDOOR RESET RATIO CHARTS Table 1-7: Header Temperature for a Building Reference Temperature of 90F RESET RATIO Temp Page 152 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 1 of 7 Page 155 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 2 of 7 Page 156 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 3 of 7 Page 157 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Part List 02/10/2014 AERCO International, Inc. Whole Boiler 28536-1 – 28382-1 Sheet 4 of 7 Blauvelt, NY 10913 Page 158 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 5 of 7 Page 159 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 6 of 7 Page 160 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Benchmark 2500 - 3000 Part List AERCO 02/10/2014 International, Inc. Whole Boiler 28536-1 – 28382-1 Blauvelt, NY 10913 Sheet 7 of 7 Page 161 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 3000 FM Gas Train AERCO 07/15/2013 International, Inc. 22171 – rev F Blauvelt, NY 10913 Page 1 of 2 Page 162 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Benchmark 3000 FM Gas Train AERCO 07/15/2013 International, Inc. 22171 – rev F Blauvelt, NY 10913 Page 2 of 2 Page 163 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 3000 DBB Gas Train AERCO 07/15/2013 International, Inc. 22173 – rev G Blauvelt, NY 10913 Page 1 of 2 Page 164 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
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Benchmark 3000 DBB Gas Train AERCO 07/15/2013 International, Inc. 22173 – rev G Blauvelt, NY 10913 Page 2 of 2 Page 165 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Boilers APPENDIX I: 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...
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Benchmark 2500 FM Gas Train AERCO 10/31/2013 International, Inc. 22190 – rev B Blauvelt, NY 10913 Page 2 of 2 Page 167 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Boilers APPENDIX I: PARTS LIST DRAWINGS BMK 2500 DBB Gas Train BOM – P/N 22211 rev B Item Description 123542 FLANGE 2" 125# 2"NPT 93069 BUSHING: REDUCING 1-1/2" TO 2" NPT 94060-2.50 NIPPLE: 1-1/2 NPT X 2.50 LG...
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Benchmark 2500 DBB Gas Train AERCO 10/31/2013 International, Inc. 22211 – rev B Blauvelt, NY 10913 Page 2 of 2 Page 169 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 GF-137 03/20/2014...
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Benchmark 2500 - 3000 Boilers APPENDIX I: PARTS LIST DRAWINGS (This page intentionally blank) Page 170 of 204 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0094_0E Ph.: 800-526-0288 03/20/2014 GF-137...
AERCO shall at its option modify, repair or exchange the defective item. AERCO shall have the option of having the item returned, FOB its factory, or to make field replacements at the point of installation. In no event shall AERCO be held liable for replacement labor charges or for freight or handling charges.
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