Rinnai exhaust inspection / flame issues

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Cfesting

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Hello, all -

Having an issue or two with my Rinnai, and need a little advice.

My Rinnai is vented with a noncondensing ubbink immediate 90 out the exterior wall that it's mounted on. My question: How do you remove the 90 to inspect / clean the exhaust? I'm not finding enough flex / wiggle room to get it out. I've even loosened the wall mount and tilted the top of the unit about an inch forward. What is the trick that I am missing?

The real issue I am having:
No error codes; when in high flow / high flame scenario, the flame "tornados" and creates a loud bass-like sound with vibration. At a low flame the flames look pretty good; perhaps a hair high but I might be overthinking that. I have cleaned the intake air turbine, the burners, and descaled. I do those things on a regular basis. It's on a propane tank and has been in operation for about 11 years. Again, the exhaust has never been inspected as I can't get that 90 off. This issue coincides with fall and "stink bug season" where flocks of bugs try to migrate indoors.

I have not looked into gas pressure yet; would need to acquire a manometer. This would be my next step after examining exhaust. Would be surprised if gas delivery changed; am I wrong to think a regulator is a low failure rate item? This is the only device using this propane tank.

Any thoughts? Thanks!
 
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