Benchmark Boiler Manuals

View and Download Aerco Benchmark 1.5LN installation, operation and maintenance manual online. Low NOx Boiler. Benchmark 1.5LN Boiler pdf manual download.

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• Disaster Relief Assistance is avalible on HVAC-Talk. Hey everyone looking for someone with some experience with these boilers my company services a school district with about 15 of these boilers in it. The one that im working on has a serial number of G-04-0587. The boiler goes into flame failure few times a week. I pulled the burner off the top but didnt see anything unusual. I go to do a combustion test and with a 40% firing rate and 35 degree fresh air intake temp my o2 should be about 8.7%, at 16% firing rate should be 12% or less and 100% firing rate 6.2%. I cant get my o2 above 4% at anytime no matter how much I adjust my differential regulator or main regulator and my fresh air damper is wide open.

Im thinking it might have something to do with the air/fuel valve. I recalibrated the stepper motor.

Could the air fuel valve not be letting air by even though it says the correct number on the stepper motor at 100% fire stepper motor says 100. Thanks for your guys help! I looked at the earliest manual I could find and it was a 2008 boiler that had the external vfd for the motor. On that machine the O2 range is like 5% at 100% fire rate and it goes to like 6.8% at 16% fire rate.

In the factory menu there is a point called ign position it is usually 29%.when I do startups I manual the boiler to 30% in manual then set the O2 to like 7% and see how it lights then I adjust down to 16% fire rate and start watching flame current. I then try to adjust the O2 at 16% to around 7 and 8% and see what gives me the strongest flame signal. Then go to 80% or 100 if your system will allow it and work down the calibration points to 16%. Then Your all set. All of this assumes your ssov gas pressure is adjusted and verified at 30 and 100%. Have you ever experienced what I can only describe as a burp of the benchmark 2.0?

The scenario is that sometimes in normal operation the boilers will have a big rattle or noise from the exhaust stack, and then it goes away. Almost like it's barking like a dog. It can happen once in a while and operation continues fine or sometimes it causes a flame failure. I should point out that we are dealing with 07 vintage units that have likely not had their O2 calibration done in quite a while. I am currently having my guys look to be sure we are draining condensate well. Have you ever experienced what I can only describe as a burp of the benchmark 2.0? The scenario is that sometimes in normal operation the boilers will have a big rattle or noise from the exhaust stack, and then it goes away.

Almost like it's barking like a dog. It can happen once in a while and operation continues fine or sometimes it causes a flame failure. I should point out that we are dealing with 07 vintage units that have likely not had their O2 calibration done in quite a while.

I am currently having my guys look to be sure we are draining condensate well.I would check you condensate first. They need to be cleaned regularly. Winpcnc Crackers on this page. Sent from my iPad using Tapatalk.

Aerco used steel f and t traps for the condensate back then. Aerco has a upgrade or retrofit kit for it. Also the air fuel valve butterfly would sometimes drop due to setscrew getting loose then stick on bottom of air fuel body. Turn power off and drive valve by hand it should move freely.

When tuning combustion always drive above then down to set point 40% adjust gas reg at 100% iris air damper. Also check flex hoses on inlet air if crushed or inlet not extended it will restrict air.

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