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Tex Arcana
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Home A/C questions...

I can't remember the detailsmof what a system SHOULD be doing, so here goes:

House a/c is fucking up, it's the original, 11 years old, Lennox R-22 system.

Pressures were 250/90 before the service call, duct exit temps 69defF, compressor air outlet temp 109degF on a 98degF day, clear and dry.

do those sound right, or am I getting ed?

Tech bled system down so the low side was 75psi, but that leaves the high side about 200, which makes me think there is an issue.

Then the fucker wrote on the ticket "pressures normal" and "duct outlet temps 60degF" (outright lie), and now the system runs more than it's off.

Is it fucked? Did I get fucked? I have a home warranty, $59 per service call, I do plan on calling to bitch tomorrow.

Advice? Comments? Flames?

TIA.
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Old 06-12-2011, 11:11 PM Tex Arcana is offline  
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TheMorlock
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R-22 systems put out some motherfucking cold air. I used to work on the smaller systems at a hotel I worked at.

Used an R 12 system for a walk in fridge and used R-22 for the freezer. The ambient in the compressor room would often be 100 F in summer. You could not touch the condenser and the air coming out of it felt like a furnace. I think that was a 10 ton system.

The 13 thousand btu room units in the same environment would take that 100f down to ~53 and they were just R12.

Dont remember what the high and low side pressures were on any of these systems. Been a long time and I never took a course in A/C just read a few chapters of the text books my boss had from when he took a course.


As far as getting screwed. If it had been running normally and no prior service call had more freon put in, then there is no fucking reason to take any freon out.

Call Lennox with the model number and ask for specs.
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Old 06-12-2011, 11:32 PM TheMorlock is offline  
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Tex Arcana
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I called for a return, and a supervisor, last night, the system hasn't stopped running since he was here last week.

Well, same guy came out, I guess I was supposed to believe the fat pimply teenager with him was his "supervisor".

He added freon, used his little thermistor to read the high side pipe's temp, went into the attic to measure temps across the evap coil, then tested temps at the vent and return. I don't trust what he says (tried to tell me the system pressures were 300/110 last week, which is a bald-faced lie ::. What I observed (on his meter thermistor) was 72deg vent temp, 84deg return temp, 81deg at the thermostat (which is under the return). And that's after he charged it to this:



He's claiming 20deg temp drop across the evap coil, but I only saw about 10deg rise on the condenser (98deg day). And the vent he was using is one of the closest to the unit.

None of this seems right, the air coming off the unit should be hot enough to almost hurt. And that low side press is still high, isn't it?

At least I haven't had to pay anything but the $59 service call fee, tho I think I'm gonna call the warranty company, talk to a decision-maker, and get a completely different company out here to look at this, the guy's vehicle doesn't even have company signage or a license number on it. ::
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Old 06-14-2011, 02:36 PM Tex Arcana is offline  
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IMFlacid
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suction is way to high, unless you had a really high heat load in your house. if he was reading the temp on your high side, then he was calculating your total system subcooling (assuming you have a TXV)

when i see suction that high ill make sure you evap. coil is clean (off course filters too), or loose duct work somewhere above the ceiling causing a higher load on the coil.
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Old 06-14-2011, 03:49 PM IMFlacid is offline  
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Tex Arcana
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Quote:
Originally Posted by marter View Post
suction is way to high, unless you had a really high heat load in your house. if he was reading the temp on your high side, then he was calculating your total system subcooling (assuming you have a TXV)

when i see suction that high ill make sure you evap. coil is clean (off course filters too), or loose duct work somewhere above the ceiling causing a higher load on the coil.

What's "TXV"?

He supposedly checked the evap coil, and says it's clean. Filter is new, as well. He's been up there twice now, and says everything is fine, but this persists. So I'm to the point where I don't trust the fucker, and I'm gonna ream the warranty company tomorrow, and insist on another company take a look at this. Or they're going to refund me my contract $$ and I'll hire my own.
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Old 06-14-2011, 04:18 PM Tex Arcana is offline  
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IMFlacid
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thermal expansion valve, works to maintain a constant superheat to the compressor. It senses the suction temp at the evaporator outlet and adjusts the amount of liquid/vapor that enters the evaporator.

If you want a good opinion, dont get one from a warranty company.
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Old 06-14-2011, 05:11 PM IMFlacid is offline  
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Tex Arcana
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Quote:
Originally Posted by marter View Post
thermal expansion valve, works to maintain a constant superheat to the compressor. It senses the suction temp at the evaporator outlet and adjusts the amount of liquid/vapor that enters the evaporator.

If you want a good opinion, dont get one from a warranty company.

Or the cheap-assed ac outfit they farmed the work out to. Last year's ac farm out company was pretty damn good, overall.
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Old 06-14-2011, 10:29 PM Tex Arcana is offline  
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home warranty services always contract with the absolute fucking worst HVAC people. You check every option they have in your region, and itll all be 1 star reviews online.

That said, you can ask for a different supplier, and they'll give it to you, but be aware they might be as bad or worse than the current one.

citation: every experience with AHS I ever had.
Old 06-14-2011, 10:37 PM Forever Domon is offline  
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Tex Arcana
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Quote:
Originally Posted by Forever Domon View Post
home warranty services always contract with the absolute fucking worst HVAC people. You check every option they have in your region, and itll all be 1 star reviews online.

That said, you can ask for a different supplier, and they'll give it to you, but be aware they might be as bad or worse than the current one.

citation: every experience with AHS I ever had.

Yeah, AHS was the one in the first year in this house (oct 2009); since then, it's been OneGuard, who's been pretty good overall, at least so far.
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Old 06-16-2011, 12:19 AM Tex Arcana is offline  
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