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Old 05-27-2020, 11:04 PM   #1
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What is this guage and should I replace my AC unit?


I have a Ducane AC that is 15 years old and runs fine, fins are corroding at the bottom as shown in the pics. It's a 2.5 ton, 10 SEER running r-22. Would it be worth it to replace the unit and air handler with a 16+ SEER unit? And what is this gauge that looks to be on the return line?
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Old 05-27-2020, 11:07 PM   #2
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Re: What is this guage and should I replace my AC unit?


that's a sight glass, not a gauge.

not worth replacing unless you're in a brutally hot climate.

you should insulate the larger pipe outside.
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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 05-27-2020, 11:15 PM   #3
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Re: What is this guage and should I replace my AC unit?


That's a sight glass that is used to determine if the system has enough charge. It should be clear when the unit is running. If it shows bubbles it could mean the refrigerant charge could be low.

Apparently that particular sight glass doesn't indicate whether the system has moisture in it. The more recent ones will show green on a dry system and yellow when there is moisture in the system. It does look yellow now that I blow it up and it looks like a Sporlan unit. EDIT:The dot in the center is the indicator and since it's black, I suspect it isn't active and can't be relied on to indicate any moisture content of the system.

That old unit probably isn't very efficient and may not last much longer but if it's still doing the job, I'd say run it into the ground.

When you replace it, you'll also have to replace the evaporator coil since the new systems use different gas now.
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Old 05-28-2020, 03:12 AM   #4
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Re: What is this guage and should I replace my AC unit?


You would notice a good difference on your electric if you put in a new 16 seer system vs what you have. We donít know where your from so we really donít know how much use you get out of it. Incidentally the damage to your coils is caused by Fido lifting his leg on it. Donít know if itís an old dog or current one. But will destroy a new ac in no time if heís allowed to continue using it
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