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Aerco GF-110 Benchmark Series Installation, Operation & Maintenance Instructions Manual

Gas fired boiler system condensing, modulating forced draft, hot water boiler 2,000,000 btu/h input
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Instruction
GF-110
No.
AERCO INTERNATIONAL, Inc., Northvale, New Jersey, 07647 USA
Installation, Operation
& Maintenance Instructions
Benchmark™
Series
Gas Fired
Boiler System
Condensing, Modulating
Forced Draft, Hot Water Boiler
2,000,000 BTU/H Input
Applicable for Serial Numbers G-02-533 and above
Patent # : 2.155.12
REVISED JANUARY, 2009
Printed in U.S.A.

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Summary of Contents for Aerco GF-110 Benchmark Series

  • Page 1 Instruction GF-110 AERCO INTERNATIONAL, Inc., Northvale, New Jersey, 07647 USA Installation, Operation & Maintenance Instructions Benchmark™ Series Gas Fired Boiler System Condensing, Modulating Forced Draft, Hot Water Boiler 2,000,000 BTU/H Input Applicable for Serial Numbers G-02-533 and above Patent # : 2.155.12 REVISED JANUARY, 2009 Printed in U.S.A.
  • Page 2 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 par- ticular application.
  • Page 3 CONTENTS GF-110 - THE AERCO BENCHMARK 2.0 GAS FIRED BOILER Operating & Maintenance Instructions FOREWORD Chapter 1 – SAFETY PRECAUTIONS Para. Subject Page Para. Subject Page Safety Warnings Prolonged Shutdown Emergency Shutdown Chapter 2 – INSTALLATION PROCEDURES Para. Subject Page Para.
  • Page 4 CONTENTS Chapter 5 – MODE OF OPERATION Para. Subject Page Para. Subject Page Introduction Boiler Management System Indoor/Outdoor Reset Mode (BMS) Constant Setpoint Mode Combination Control System Remote Setpoint Mode (CCS) Direct Drive Modes Chapter 6 – SAFETY DEVICE TESTING PROCEDURES Para.
  • Page 5 CONTENTS APPENDICES Subject Page Subject Page Boiler Menu Item Descriptions Dimensional and Part Drawings Startup, Status and Fault Piping Drawings Messages Wiring Schematics Temperature Sensor Resistance Recommended Periodic Testing Chart Checklist Indoor/Outdoor Reset Ratio Benchmark Control Panel Views Charts Benchmark Dual-Fuel Propane Boiler Default Settings Switch-Over Instructions WARRANTIES...
  • Page 7 FOREWORD Foreword The AERCO Benchmark boiler is a true industry advance that meets the needs of today's energy and environmental concerns. Designed for application in any closed loop hydronic system, the Benchmark's modulating capability relates energy input directly to fluctuating system loads.

  • Page 9: Safety Precautions

    SAFETY PRECAUTIONS CHAPTER 1 SAFETY PRECAUTIONS WARNING 1.1 WARNINGS & CAUTIONS DO NOT USE MATCHES, CANDLES, Installers and operating personnel MUST, at all FLAMES, OR OTHER SOURCES OF times, observe all safety regulations. The IGNITION TO CHECK FOR GAS following general warnings and cautions must be given the same attention as specific precautions LEAKS.
  • Page 10 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 11 SAFETY PRECAUTIONS Extracted Information From 248 CMR 5.08 (2) – Continued a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.
  • Page 13 NOTE: boiler. AERCO is not responsible for lost or • Spare Spark Ignitor damaged freight. • Spare Flame Detector •...
  • Page 14 Figure 2.1. The minimum clearance dimensions, required by In multiple unit installations, it is important to AERCO, are listed below. Local building codes plan the position of each unit. Sufficient space may require additional clearance and take...
  • Page 15 Condensate Trap Installation the trap. 2.4. GAS SUPPLY PIPING 3. Attach a length of 1” I.D. polypropylene hose between the exhaust manifold drain and the AERCO Fired Equipment inlet side of the condensate trap (Fig 2.5). Components and Supply Design Guide (GF- Secure both ends of the hose with clamps.
  • Page 16 The location of the 2" inlet gas connection is A Maxitrol RV-91 gas supply regulator is located on the rear of the unit as shown in supplied by AERCO and must be positioned as Figure 2.5. shown in figure 2.5. For a dual fuel unit, two RV- 91 regulators are supplied.
  • Page 17 Each of the above power configurations contain 2.5 ELECTRICAL SUPPLY a Power Box with a terminal block which The AERCO Gas Fired Equipment Electrical matches the configuration ordered. The three Power Wiring Guide, (GF-2060), must be different terminal block configurations are shown consulted in addition to the following material in Figure 2.7.
  • Page 18 This wiring is typically An outside air temperature sensor (AERCO PN run to the Input/Output (I/O) Box located on the GM-122791) is required. The sensor MUST BE front of the unit behind the removable front door wired to the I/O Box wiring terminals (see Fig.
  • Page 19 AERCO BMS. The boiler end of the that will work best with your application. shield must be left floating. For additional more information on wiring the 4 to 20 mA / 1to instructions, refer to Chapter 5, paragraph 5.6 in...
  • Page 20 BMS Model 168 (Boiler Management wired to the AUX SENSOR IN and SENSOR System). The wiring must be done using a COMMON and must be similar to AERCO shielded twisted pair of 18- 22 AWG wire and BALCO wire sensor P/N 12449. A resistance...
  • Page 21 5 amps at 120 VAC and 5 amps at 30 VDC. The relay energizes when any fault of the boiler. The exhaust sensor should be a normally open type switch (such as AERCO Part condition occurs and remains energized until the fault is cleared and the CLEAR button is No.
  • Page 22 The free area must take into account restrictions 2.10 COMBUSTION AIR such as louvers and bird screens. The AERCO Venting and Combustion Air Guide, 2.10.2 COMBUSTION AIR FROM INSIDE GF-2050, MUST be consulted before any flue or THE BUILDING combustion supply air venting is designed or started.
  • Page 23 CONTROL PANEL OPERATING PROCEDURES Chapter 3 - CONTROL PANEL OPERATING PROCEDURES 3.1. INTRODUCTION The information in this Chapter provides a guide to the operation of the Benchmark Boiler using the Control Panel mounted on the front of the unit. It is imperative that the initial startup of this unit be performed by factory trained personnel.
  • Page 24 CONTROL PANEL OPERATING PROCEDURES Table 3-1 Operating Controls, Indicators and Displays ITEM CONTROL, INDICATOR OR DISPLAY FUNCTION LED Status Indicators Four Status LEDs indicate the current operating status as follows: Lights when RS-232 communication is occurring COMM Lights when the unit is being controlled using the front panel MANUAL keypad.
  • Page 25 CONTROL PANEL OPERATING PROCEDURES Table 3-1 Operating Controls, Indicators and Displays - Continued ITEM CONTROL, INDICATOR OR DISPLAY FUNCTION Menu Keypad Consists of 6 keys which provide the following functions for the Control Panel Menus: Steps through the main menu categories shown in Figure MENU 3-2.
  • Page 26 CONTROL PANEL OPERATING PROCEDURES display options Bottom-Up 3.3. CONTROL PANEL MENUS sequence. The menu options will wrap The Control Panel incorporates an extensive around after the first or last available option menu structure which permits the operator to set is reached. up, and configure the unit.
  • Page 27 CONTROL PANEL OPERATING PROCEDURES Setup Menu is also used to enter date and time, 3.4. OPERATING MENU language to be used for display messages, units The Operating Menu displays a number of key of temperature measurements and entries operating parameters for the unit as listed in required for external communication and control Table 3-2.
  • Page 28 CONTROL PANEL OPERATING PROCEDURES 3.6. CONFIGURATION MENU NOTE: The Configuration Menu shown in Table 3-4 permits adjustment of the Internal Setpoint The Configuration Menu settings shown in Table (Setpt) temperature regardless of whether the 3-4 are Factory-Set in accordance with the valid password has been entered.
  • Page 29 CONTROL PANEL OPERATING PROCEDURES these menu entries unless specifically requested 3.7. TUNING MENU to do so by Factory-Trained personnel. The Tuning Menu items in Table 3-5 are Factory set for each individual unit. Do not change Table 3-5. Tuning Menu Available Choices or Limits Menu Item Display Minimum...
  • Page 30 CONTROL PANEL OPERATING PROCEDURES (a) Blower relay energizes and turns on blower. (b) Air/Fuel Valve rotates to 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%). (c) The FIRE RATE bargraph will show 100%.
  • Page 31 CONTROL PANEL OPERATING PROCEDURES 8. With the unit firing properly, it will be Once the demand for heat has been satisfied, controlled by the temperature controller cir- the Control Box will turn off the gas valve. The cuitry. The FIRE RATE will be continuously blower relay will be deactivated and the Air/Fuel Valve will be closed.
  • Page 33 P/N GM-122643 for Dual Fuel the initial unit start-up. units. An AERCO Gas Fired Startup Sheet, included 5. Small and large flat blade screwdrivers. with each BENCHMARK, must be completed for each unit for warranty validation and a copy must 6.
  • Page 34 INITIAL START-UP 4.2.4 INSTALLING THE DIFFERENTIAL REGULATOR ADJUSTMENT TOOL FOR NATURAL GAS UNIT. 1. Remove the cap from the differential pressure regulator (see Figure 4.3). 2. Place the gasket from the regulator cap onto the regulator adjustment tool. 3. Prior to installing the tool on the regulator, pull up the screwdriver blade of the tool.
  • Page 35 INITIAL START-UP 4. Engage the tool’s screwdriver blade into the regulator’s adjustment screw slot. NOTE: If calibrating a dual fuel unit, ensure that the diverter valve handle is set to the horizontal position for Natural Gas before proceeding. 1. Open the water supply and return valves to the unit and ensure that the system pumps are running 2.
  • Page 36 INITIAL START-UP 15. If the measured oxygen reading is within the NOTE: specified range shown in Table 3, no further adjustment is necessary. Adjust only the differential regulator at 40% control signal. Do not adjust the iris air 16. If the measured oxygen level is not within damper.
  • Page 37 INITIAL START-UP displayed, followed by the present rate in NOTE: %. Also, the MANUAL LED will light. Prior to calibrating a Dual-Fuel Unit for 8. Adjust the rate to 0% by pressing the ▼ propane, ensure that the Start and Stop arrow key.
  • Page 38 INITIAL START-UP insure that it is still within the range Table 5 specified in Table 4. Combustion Oxygen Levels for a 24% Firing Rate 19. Continue this procedure until oxygen levels Inlet Air Carbon at 40%, 24% and 100% firing rates are Oxygen Temp Monoxide...
  • Page 39 INITIAL START-UP 4.6 OVER-TEMPERATURE LIMIT SWITCH The over-temperature limit switches are located on the plate to the left of the boiler shell. One is a fixed manual reset switch that will shutdown and lock out the boiler if the water temperature reaches 210°F.

  • Page 41: Mode Of Operation

    MODE OF OPERATION CHAPTER 5 MODE OF OPERATION 5.1 INTRODUCTION 5.2.3 Outdoor Air Temperature Sensor Installation The Benchmark Boiler is capable of being operated in any one of six different modes. The The outdoor air temperature sensor must be following paragraphs in this Chapter provide mounted on the North side of the building in an descriptions of each of these operating modes.
  • Page 42 PMC Board located in the Control Panel that work well in most applications. Prior to Assembly. Contact your local AERCO changing any temperature-related parameters, other than the setpoint, it is suggested that an representative for details.
  • Page 43 4-20 mA/1-5 Vdc applications. It is suggested that an AERCO representative be contacted, prior to changing 0-20 mA/0-5 Vdc any temperature related function settings. For...
  • Page 44 This mode of operation is factory preset and the width modulation (PWM) RS485 AERCO BMS controls the firing rate. There are Modbus signaling to the Boiler. BMS II no setup instructions for each individual unit. Model 5R5-384 can utilize only RS485 signaling to the Boiler.
  • Page 45 When the boiler is switched to BMS mode, the switch over to space heating, their mode of operation changes to the BMS mode. For more AERCO BMS controls the firing rate. There are information concerning the operation of the no setup requirements to the boiler(s) in this Combination Control Panel see the AERCO mode.

  • Page 47: Safety Device Testing

    The AERCO PRESSURE fault message at 6” W.C. control system comprehensively monitors all combustion related safety devices before, during and after the start sequence. The following tests have been chosen to ensure that the system will either not start or will shut-down as intended.
  • Page 48 SAFETY DEVICE TESTING 4. Reconnect the wire previously removed from the high gas pressure switch and depress the CLEAR button. 5. The unit should restart. 6.4 LOW WATER LEVEL FAULT TEST 1. Place the ON/OFF switch in the OFF position. 2.
  • Page 49 SAFETY DEVICE TESTING 6.6.1 REMOTE INTERLOCK 6.7 FLAME FAULT TEST 1. Remove the cover from the I/O Box and locate the REMOTE INTL’K IN terminals. 1. Place the ON/OFF switch in the OFF position. 2. Start the unit in manual mode and fire at 25% to 30% firing rate.
  • Page 50 SAFETY DEVICE TESTING Figure 6.5 Blower Proof Switch Location and Wiring Figure 6.4 Diverter Valve Positions 6.9 SSOV PROOF OF CLOSURE SWITCH 9. Restart the unit and allow it to prove flame. 1. Set the unit’s ON/OFF switch to the OFF position.
  • Page 51 SAFETY DEVICE TESTING 5. Replace the wire on the ignition position switch and depress the CLEAR button. The unit should restart. VALVE COVER Figure 6.6 SSOV Actuator Cover Screw Location 6.10 PURGE SWITCH OPEN DURING PURGE Figure 6.7 1. Set the unit’s ON/OFF switch to the OFF Air/Fuel Valve Cover Location position.
  • Page 53 MAINTENANCE Chapter 7 - MAINTENANCE 7.1 MAINTENANCE SCHEDULE The unit requires regular routine maintenance to keep up efficiency and reliability. For best operation and life of the unit, the following routine maintenance procedures should be carried out in the time periods specified in Table 7-1.
  • Page 54 MAINTENANCE bushing over the contactor and reconnect 8. Reinstall the side and top panels on the unit. the igniter cable. Table 7-1 - Maintenance Schedule Labor PARAGRAPH ITEM 6 Mos. 12 Mos. 24 Mos. Time Spark Igniter *Inspect Replace 15 mins. (GP-122435-S) Flame Detector *Inspect...
  • Page 55 MAINTENANCE 7.5 SAFETY DEVICE TESTING Systematic and thorough tests of the operating and safety devices should be performed to ensure that they are operating as designed. Certain code requirements, such as ASME CSD- 1, require that these tests be performed on a scheduled basis.
  • Page 56 MAINTENANCE realignment is required, loosen the support 7.7 CONDENSATE DRAIN TRAP brackets/U-bolts at the upper and lower The boiler contains a condensate drain trap portions of the gas train as shown in Figure connected to the drain line of the exhaust 7.4.
  • Page 57 MAINTENANCE 7.8 SHUTTING THE BOILER DOWN FOR 7.9 PLACING THE BOILER BACK IN AN EXTENDED PERIOD OF TIME SERVICE AFTER A PROLONGED SHUTDOWN If the boiler is to be taken out of service for an extended period of time, one year or more, the After a prolonged shutdown (a year or more), the following instructions must be followed: following procedures must be followed:...

  • Page 59: Troubleshooting

    6. If the fault cannot be corrected using the information provided in the Troubleshooting Tables, contact your local AERCO Repre- 1. Observe the fault messages displayed in the sentative. Control Box display.
  • Page 60 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION AIRFLOW FAULT 1. Blower stopped running due to thermal 1. Check combustion blower for signs of excessive heat or high DURING IGNITION or current overload current drain that may trip thermal or current overload devices. 2.
  • Page 61 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION DELAYED 1. Delayed Interlock Jumper not 1. Check for a jumper properly installed across the delayed INTERLOCK OPEN installed or removed. interlock terminals in the I/O box. 2.
  • Page 62 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION FLAME LOSS 1. Worn Flame Detector or cracked 1. Remove and inspect the Flame Detector for signs of wear or DURING RUN ceramic. cracked ceramic. Replace if necessary. 2.
  • Page 63 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION HIGH WATER TEMP 1. Faulty Water temperature switch. 1. Test the temperature switch to insure it trips at its actual water SWITCH OPEN temperature setting. 2. Incorrect PID settings. 2.
  • Page 64 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION IGN SWTCH CLOSED 1. Air/Fuel Valve not rotating 1. Start the unit. The Air/Fuel Valve should rotate to the purge DURING PURGE (open) position. If the valve does not rotate at all or does not rotate fully open, check the Air/Fuel Valve calibration.
  • Page 65 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION 1. Check hot and neutral in AC Power Box to ensure they are not LINE VOLTAGE 1. Line and Neutral switched in AC reversed OUT OF PHASE Power Box.
  • Page 66 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION continued 5. Defective IGST Board 5. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace IGST Board. PRG SWTCH OPEN 1.
  • Page 67 TROUBLESHOOTING TABLE 8-1. BOILER TROUBLESHOOTING – Continued FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION (continued) 2. Defective Flame Detecto 2. Replace Flame Detector. SSOV FAULT See SSOV SWITCH OPEN DURING PURGE SSOV FAULT 1. SSOV switch closed for 15 seconds 1. Replace or adjust microswitch in SSOV actuator. If fault DURING RUN during run.
  • Page 69 APPENDIX A BOILER MENU ITEM DESCRIPTIONS MENU LEVEL & OPTION DESCRIPTION OPERATING MENU Active Setpoint This is the setpoint temperature to which the control is operating when operating in the Constant Setpoint, Remote Setpoint or Outdoor Reset Mode. When in the Constant Setpoint Mode, this value is equal to the Internal Setpoint setting in the Configuration Menu.
  • Page 70 APPENDIX A BOILER MENU ITEM DESCRIPTIONS - Continued MENU LEVEL & OPTION DESCRIPTION SETUP MENU Password Allows password to be entered. Once the valid password (159) is entered, options in the Setup, Configuration and Tuning Menus can be modified. Language English Only Time Displays time from 12:00am to 11:59pm.
  • Page 71 APPENDIX A BOILER MENU ITEM DESCRIPTIONS - Continued MENU LEVEL & OPTION DESCRIPTION Reset Ratio Permits setting of Reset Ratio when operating boiler in the Outdoor Reset Mode. Reset Ratio is adjustable from 0.1 to 9.9. Default is 1.2. Outdoor Sensor Allows outdoor sensor function to be enabled or disabled.
  • Page 72 APPENDIX A BOILER MENU ITEM DESCRIPTIONS - Continued MENU LEVEL & OPTION DESCRIPTION Setpt Limiting Allows Setpoint Limiting to be enabled or disabled. Default is disabled. Setpt Limit Band If Setpoint Limiting is enabled, this menu item allows the Setpt Limit Band to be set from 0°F to 10°F. Default is 5°F.
  • Page 73 APPENDIX B STARTUP, STATUS AND FAULT MESSAGES STARTUP AND STATUS MESSAGES MESSAGE DESCRIPTION DISABLED Displayed if ON/OFF switch is set to OFF. The display also HH:MM pm MM/DD/YY shows the time and date that the unit was disabled. STANDBY Displayed when ON/OFF switch is in the ON position, but there is no demand for heat.
  • Page 74 APPENDIX B FAULT MESSAGES FAULT MESSAGE FAULT DESCRIPTION HIGH WATER TEMP The High Water Temperature Limit Switch is open. SWITCH OPEN LOW WATER The Water Level Control board is indicating low water level. LEVEL LOW GAS The Low Gas Pressure Limit Switch is open. PRESSURE HIGH GAS The High Gas Pressure Limit Switch is open.
  • Page 75 APPENDIX B FAULT MESSAGES - Continued FAULT MESSAGE FAULT DESCRIPTION RESIDUAL The Flame signal was seen for more than 60 seconds during FLAME standby. HEAT DEMAND The Heat Demand Relays on the Ignition board failed to FAILURE activate when commanded. A communication fault has occurred between the PMC board IGN BOARD COMM FAULT...
  • Page 77 APPENDIX C Temperature Sensor Resistance Chart (Balco)
  • Page 79 APPENDIX D INDOOR/OUTDOOR RESET RATIO CHARTS Header Temperature for a Building Reference Temperature of 50F RESET RATIO Temp -10F -15F -20F Header Temperature for a Building Reference Temperatrure of 60F RESET RATIO Temp -10F -15F -20F...
  • Page 80 APPENDIX D Header Temperature for a Building Reference Temperature of 65F RESET RATIO Temp Header Temperature for a Building Reference Temperature of 70F RESET RATIO Temp -10F -15F -20F...
  • Page 81 APPENDIX D Header Temperature for a Building Reference Temperature of 75F RESET RATIO Temp -10F -15F Header Temperature for a Building Reference Temperature of 80F RESET RATIO Temp -10F...
  • Page 82 APPENDIX D Header Temperature for a Building Reference Temperature of 90F RESET RATIO Temp...
  • Page 83 APPENDIX E BOILER DEFAULT SETTINGS MENU & OPTION FACTORY DEFAULT Setup Menu Password Language English Unit of Temp Fahrenheit Comm Address Baud Rate 9600 Configuration Menu Internal Setpt 130°F Unit Type Boiler Unit Size 1.0 MBTU Boiler Mode Constant Setpoint Remote Signal 4 –...
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  • Page 107 APPENDIX I RECOMMENDED PERIODIC TESTING CHECK LIST WARNING NOTE: Periodic testing of all boiler controls and safety devices is required to determine that they are operating as designed. Precautions shall be taken while tests are being performed to protect against bodily injury and property damage.
  • Page 109 APPENDIX J CONNECTOR BOARD P/N 124366 LOW WATER CUTOFF BOARD P/N 124363 PMC BOARD P/N 124364 DISPLAY BOARD P/N 124365 GREEN LED P/N 124948 ENCLOSURE P/N 124951 ROCKER SWITCH P/N 124947 POWER SUPPLY BOARD V.F.D. DISPLAY P/N 124362 MODULE P/N 124527 IGNITION/STEPPER BOARD P/N 124361 FISH PAPER...
  • Page 110 APPENDIX J BENCHMARK CONTROL PANEL REAR VIEW...
  • Page 111 APPENDIX K BENCHMARK DUAL-FUEL PROPANE SWITCH-OVER INSTRUCTIONS Prior to operating a Benchmark Dual-Fuel Unit using propane, the Start and Stop levels must be changed to 28% and 24%. In addition, the following valves must be set to the following positions: •...
  • Page 112 APPENDIX K FIGURE 1. DUAL-FUEL DIVERTER VALVE FIGURE 2. DUAL-FUEL AIR INJECTION VALVE...

  • Page 113: Standard Warranty

    Any claim relating to the product must be filed with AERCO not later than 14 days after the event-giving rise to such claim. Any claims relating to this product shall be limited to the sale price of the product at the time of sale. The sale of the product is specifically conditioned upon acceptance of these terms.
  • Page 114 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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