To Next PageTo Next PageHow to check line voltage out of phase in Aerco Boiler?
If you suspect the line voltage is out of phase in your Aerco Boiler: * Check Line (hot) and Neutral in the AC Power Box to ensure they are not reversed. * Check transformer wiring, in the AC Power Box, against the power box transformer wiring diagram to ensure it is wired correctly.
How to resolve interlock open issue in Aerco Benchmark 3.0LN Boiler?
If you find the interlock open on your Aerco Boiler, take these steps: * Check for a jumper properly installed across the interlock terminals in the I/O box. * If there are two external wires on these terminals, check any Energy Management system to see if they have the units disabled (a jumper may be temporarily installed to see if the interlock circuit is functioning). * Check that the proving switch for any device hooked to the interlock circuit is closing and that the device is operational.
How to fix delayed interlock open in Aerco Benchmark 3.0LN Boiler?
To resolve a delayed interlock open issue with your Aerco Boiler: * Check for a jumper properly installed across the delayed interlock terminals in the I/O box. * If there are 2 external wires on these terminals, check to see if an end switch for a device such as a pump, louver, etc. is tied to these interlocks. Ensure that the device and or its end switch are functional. (a jumper may be temporarily installed to test interlock)
What to do for airflow fault during run in Aerco Benchmark 3.0LN Boiler?
If you encounter an airflow fault during the run cycle of your Aerco Boiler: * Check the combustion blower for signs of excessive heat or high current draw that may trip thermal or current overload devices. * Inspect the inlet to the combustion blower, including any ductwork leading up to the combustion blower, for signs of blockage. * Remove the airflow switch and inspect for signs of blockage, clean or replace as necessary. * Measure the airflow switch for continuity with the combustion blower running. If there is an erratic resistance reading or the resistance reading is greater than zero ohms, replace the switch. * Run the unit to full fire. If the unit rumbles or runs rough, perform combustion calibration.
How to troubleshoot airflow fault during purge in Aerco Benchmark 3.0LN?
To troubleshoot an airflow fault during the purge cycle of your Aerco Boiler: * Start the unit. If the blower does not run, check the blower solid state relay for input and output voltage. If the relay is okay, check the blower. * Start the unit. If the blower runs, check the airflow switch for continuity. Replace the switch if there is no continuity. * Remove the air flow switch and inspect for signs of blockage, clean or replace as necessary. * Inspect the inlet to the combustion blower including any ductwork leading up to the combustion blower for signs of blockage. * Measure for 24 VAC during the start sequence from each side of the switch to ground.
How to fix airflow fault during ignition in Aerco Boiler?
If you're experiencing an airflow fault during ignition with your Aerco Boiler, consider the following actions: * Check the combustion blower for signs of excessive heat or high current drain that may trip thermal or current overload devices. * Inspect the inlet to the combustion blower, including any ductwork leading up to the combustion blower, for signs of blockage. * Remove the Blower proof switch and inspect for signs of blockage; clean or replace as necessary. * Remove the blocked-air inlet switch and inspect for signs of blockage; clean or replace as necessary. * Measure the Blower proof switch for continuity with the combustion blower running. Replace the switch if there is an erratic resistance reading or the resistance reading is greater than zero ohms. * Measure the...
How to troubleshoot stepper motor failure in Aerco Boiler?
To address a stepper motor failure in your Aerco Boiler, perform the Stepper Test to ensure the stepper motor rotates properly between the 0% (fully closed) and 100% (fully open) positions. Verify that the VALVE POSITION bar graph and the dial on the Air/Fuel Valve track each other to indicate proper operation. If operation is not correct, perform the Stepper Feedback Calibration.
What to do if the high water temp switch is open in my Aerco Boiler?
To address a high water temperature switch open issue in your Aerco Boiler: * First, test the temperature switch to ensure it trips at its actual water temperature setting. * Check the PID settings against the Menu Default settings. If they have been changed, record the current readings, then reset them to the default values. * Using the resistance charts, measure the resistance of the Shell sensor and BTU sensor at a known water temperature. * If the unit is in Manual Mode, switch to Auto Mode. * Check the setpoint of the unit and the setpoint of the Temperature Switch, ensuring that the temperature switch is set higher than the unit’s setpoint. * Check the BMS for changes to PID default values and correct as necessary. * If the system pump is controlled by an Energy Manage...
How to check outdoor temp sensor fault in Aerco Benchmark 3.0LN Boiler?
If you're experiencing an outdoor temperature sensor fault with your Aerco Boiler: * Inspect the Outdoor Temperature sensor for loose or broken wiring. * Check the resistance of the sensor to determine if it is within specification. * Ensure that the correct sensor is installed.
How to fix remote setpt signal fault in Aerco Boiler?
To address a remote setpoint signal fault in your Aerco Boiler: * Check the I/O Box to ensure the signal is hooked up. Hook up if not installed. If installed, check polarity. Measure signal level. Check continuity of wiring between source and boiler. * Check the signal at the source to ensure it is isolated. * Check the DIP switch on the PMC board to ensure it is set correctly for the type of signal being sent. Check the control signal type set in the Configuration Menu.
General| Model | Benchmark 3.0LN Series |
|---|---|
| Category | Boiler |
| Modulation | 5:1 |
| Operating Pressure | 160 psi |
| Fuel Type | Natural Gas / Propane |
| Water Connection Size | 2" |
General safety warnings and cautions applicable at all times.
Requirements for selecting and preparing the installation site, including clearances.
Requirements for the initial startup of the boiler.
Procedure for natural gas combustion calibration.
Importance and general procedures for testing safety devices.
Procedure to test the low gas pressure fault shutdown.
Procedure to test the high gas pressure fault shutdown.
Procedure to simulate and test low water level fault.
Procedure to test the high water temperature fault.
Procedures to simulate flame faults.
Tests for Blower Proof Switch and Blocked Inlet Switch.
Testing the safety pressure relief valve.
Schedule for regular routine maintenance tasks.
