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So there is a new 410A compressor in this system? What killed the old one?

You might want to post this in the Controls section.

I still use a belt driven pump on my absorbers, just like what's in the pictures.

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Safety is paramount, and it is your responsibility as the contractor to keep them safe. We shut down the unit turn off the gas and have the customer sign that they understand what's going on. If it...

Have you tried a generic rod? I've done that in a pinch.

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Anytime the piping or condenser go below the ambient's dewpoint it will sweat. Might want to insulate as insurance.


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Don't forget duct butter. I walk by that stuff at United and I've got it on me.

I always recover and weigh in by nameplate if there is a concern. Make sure your water loop is within the limits of the heat pump. Superheat in that small of a unit can be checked anywhere on the...

One of the main purposes of the heater is to warm the oil and drive reefer out of it, so to me the heater should be as close to the bottom of the sump as possible.

Most of the large AHU's i work with have a magnehelic gauge across the filter bank. We mark the pressure difference on the new filters and replace them when they have increased about 40 percent. They...

Considering what I've learned from you. I'm still in your debt.

What is your GPM and how are you testing this? What are you pressures and temps?

both cycle times are correct. Liebert uses a 15 second interval.

You've probably already checked this but is your condensate line trapped? You might be pulling the condensate back into the pan due to vacumn.

I'm just replying so I will be subscribed to this thread. Thanks for the updates.

That's awesome. But still makes me wonder if the local crackheads weren't messing around. I just don't know how it would fly like that.

I don't know where you are located, but you might want to look into whether your condensers have all the low ambient controls needed. The piping will depend on the location of the condensers in...

Sorry, I should have been more thorough reading this post. Since I'm in cooling season I have tunnel vision. As already posted georgehvac has the right calculation.

Get the wb temps before and after the coil and convert to enthalpy difference, multiply by CFM then by 4.5.

You could make a larger one with a five gallon bucket i guess.

There are commercial ones available, i think Appion makes one. An old Navy boiler operator I know made his in school. It was basically 1/2 inch copper in a tight coil inside a coffee can. Each stub...

I have the corded model. I here that the battery operated ones work well too, however; I have never used one.

It seems like i have used or purchased every leak detector there is at one time or another. The H-10 is simply superior to them all. IMHO. I purchased mine slightly used on Ebay for about what your...

Employing rules of thumb can get you in serious trouble. Engineers have full time jobs calculating commercial loads in buildings. There are just too many variabes. Chemical treatment should also be...

I would also try to figure out what killed it the first time. Low superheat, washout, air flow issues, bad oil return.

Was it floodback that killed the old compressor? I'm assuming it was, however if it was not mechanical then you'll want to test for acid. I would flush the system with rx-11 then purge with nitro and...

Wow, a shady looking guy with a battery operated saw. I think everyone on this site would get arrested! Probably get some warrents off the books too.:-)

Sporlan's website is a wealth of info. I would also suggest using the search option on this site for accessing some of the archives on this subject, there are some great ones.

The lower the outside ambient the more refrigerant the system needs to flood the condenser. So typically if the unit is low it will show during colder temps, the rest of the time it fills the...

True, but most of the time the coil can "see" the strips. Just a thought. I would defintely investigate that coil and pan first.

Makes me wonder if the coil is growing something and only the more intense heat given off by the strips is cooking the nasty that is growing on the coil.

Jim,
How does the sta2 compare to the aat3, I wonder why they dropped the web bulb reading on the Sta2. Thanks for all your dedication to the trade and quality testing.

I would have liked to know what your Total enthalpy was (supply and return) on the old system, compared to the new system. If you have a accurate way of calculating your air flow, you can tell...

It would depend on the total amp draw of both components, and what your eac terminal is rated for. I assume all you parts are 120v and not 24. What is the model number and make of your furnace? You...

I have a Testo 510 and keep it in my bag. I still keep my old Mag on my truck because it is nice to have a analog gauge if you are getting a valve fluttering or pressure switches pulsating, sometimes...

Anenometer.

To the OP, Get your return and supply WB* and DB* numbers and plug them into a psych chart top to get your enthalpy numbers.

BTW, rpholder I have all your papers, thanks very much for them, they...

Man that sucks. Oh well, more hours billable.

I've seen this for the interior due to smoke given off during a potential fire but typically if it is outside, you can use pvc. Although I think that is the last thing the inspector would care about...

I had one like that in the attic access in the BEDROOM closet, the owner said her ex-boyfriend was handy and was trying to save money. The whole thing was a complete hack. I should have got pictures.

Nice! Is that a 120 v motor tied to one leg of the contactor?

Need more information, type off unit pressures, temps, etc.

That's pretty! So did you order a pizza and jump in to that rats nest? What did the client say?

I agree Geo is still the way to go, fuel prices are far too volatile to bank on. If you need a good resource for the wood fuel/outdoor boiler side of the dicussion try a site called Hearth.com, they...

I would agree with the ductless system recommendation. You could mount the condensors on the roof like you said and it would save on space and no need to instll ducts and close them in. What is the...

I had this happen to me on a York. There was old water damage on the furnace but the board had been replaced since, my ground was good to nuetral. I remembered someone posting on this site to check...

You can now say with confidence that you can braze while standing on your head, blindfolded at least that is how it feels every time I do it.:grin2:

The method your descibing is very popular with solar homes and outdoor wood fired boilers. The plate exchanger systems are not exactly cheap though when you include everything needed. As Beenthere...

I would suggest a small seperate furnace for just the basement, I have installed mini splits in basement renovations with good results but remember the equipment is right there, often in the same...

Next you'll be telling him that flux capacitors, and muffler bearings don't go bad!