HVAC Training- Installing a Piston Metering Device
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- Опубліковано 6 січ 2014
- Do not try this at home! HVAC training is required. Town & Country Air, Inc. serves the greater Wilmington, NC area including New Hanover, Pender, Brunswick, Bladen and Duplin counties.
Just watched this video and I've been in the field almost 11 years and I've never replaced one of these. I work on commercial and 90% of what I see has expansion valves. Im having a restriction on a heat pump at the moment and the way you described this and showed it was A+. Helped me grasp it 100%.. this is 7yr old so u might not see this but just wanted to say thanks!
Your like me been in field 20 years and I never had to replace a piston only txvs lol
Dude I was just looking for information about piston metering device and I came across your vid , I had never actually seen a piston in the flesh before , so to speak .
Thank you !
Thanks, hadn't seen that done yet. Keep up the great training videos, you can never have enough information.
Ray
Thanks, I feel the same way
Really great Video! Well Done ! Short & To the Point! Excellente!
Damn, I was looking for exactly this information for a Goodman replacement. Great Job!
Glad to help!
Great information to know in terms of the piston for the metering device
Thank you. Needed to make sure which way to face the piston.
Thanks boss. Clear teaching
If u have wring size piston will it cause the distributor tubes and piston housing to condensate like Crazzy
Thanks question if you don't change the piston from outside to inside will it become an issue if it's a heatpump when running on heat mode?
throwing a 2.5 ton 410a outside condenser unit in-line with an old r22 evaporator attic unit 2.5 ton. went to update the orfice(piston) and the new one that came with the new 410a unit is too big. old one on the r22 unit is 078 and the new one is 063. any ideas on how to make it work? cant get the new one to fit inside the copper pipe
Question is it counter clock wise or clock wise to open the piston?
Is it possible to buy a bag of the teflon orings?
I have been in commercial refer for 20 years now and recently have expanded to resi work. I picked up a coil for a customer for a 99 Rheem 3 ton R-22. Waiting for it to get a little warmer before going out there but this unit has been running flawlessly since 1999 with a .070 piston. Rheem calls for a .065 with this condensing unit and the coil company where I got their coil from (AllStyle) calls for, and sent an .074 Aint that a PITA. I'm leaning towards dropping the .070 back in just because of the track record with it in this unit. What would you do?
Charles
If I am going to purchase the piston on my inside unit would I use the model number on the inside unit or outside
Thanks for the video, have a cool day.
Hello Talyn875, First thanks for the informative video.
I have a question. I have replaced my outside 5 ton condenser with a newer york unit (no piston taped anywhere) my coil is a allstyle 5 ton r22 and r410 coil. it has a .050 piston. It ran on r22 but my new york unit is r410. What size piston do you recommend for r410. ?
+jcs1492 type in ADP piston chart in google. you will get a complete list
+talyn875 Thanks for the info and videos.
York usually comes stapled to the owners/install guide. I'm sure you don't still need to know this because it's 4 yrs later but I'm bored. 🤷♂️
Hey I have a rheem 5ton 410a outside unit that freezes before the inside unit freeze. Do you have any idea what’s going on?
Need a video on a fur down replacement!! Can't find any!!!
What size of piston should I use for a 4 ton 410 unit ?
Thankyou for the good videos..brother.. and what is the son the music name..
Where can I get a piston from. My inside unit was changed a few years ago and hasn't cooled like it did before. My new ac man said it may be the piston.
you should publish a list of other HVAC publishers in your additional information list
Ty nice video
Greetings, change a condensing unit R22 (3 tons) for a condensing unit (3 tons) R410a, use the same evaporator (perform internal cleaning), the piston that used R22 was 0.073 (Carrier), the Goodman unit comes with a piston # 0.070, I should get a Carrier piston # 0.070 or I can change it for the Goodman (they change in their physical form).
Good stuff
Liked!
What is that needle called exactly?
The truth is that I say it with respect when the one who claims to be an HVAC technician is just a remove and put for not investigating what is really happening is never going to enrich the knowledge with the experiences that are lived on a day-to-day basis in this field so dedicated and that sometimes it is difficult to solve problems but in the end there is an elegant taste of victory and that is when if a machine is not giving the conditions, verifying according to the type of expansion the super Heat or the subcoolin I am not against it of technology but to give a diagnosis without hesitation just by having a contact thermometer. a volt-ampere meter clamp and some pressure gauges in good condition and having good practices when making a verification is resolved and a solution is given without much ado. if there are advanced tools great but what I'm going to do is that to give a correct diagnosis you don't need to have the mark X example to lose say what is happening. when the system is of expansion TXV or a similar one is always determined by sub cooling , if it is capillary or piston it is determined by super heat , otherwise the video is good .
Thanks bro nice video
good job
Hey town, do you need to recover or pump down the system to replace it or you can keep the freon and do a quick replacement?
+eman3208 yes you have to pump it down.
Refresh. Thanks
You are welcome
Up in where top or bottom?
What would happen if this isn't installed in a unit?
good video
Thanks
What potential damages could be done if a meter device was installed backwards? My ac wasn’t reaching a lower temp and this is what they found out.
The refrigerant won't be metered. You'll flood the evaporator in the compressor.
Is the nut on the distributor suppose be very tight?
Familia Sanchez HVAC hand tighten then turn about a quarter turn more with crescent wrenches obviously one for top nut and one to hold bottom nut in place those are usually the recommended tightening for this application bro if you over tighten it I can crush the gaskets inside and do other damage
@@wildman8601 ml ml
If this was not a heat pump would the piston still go in the same way?
Yes
How can you figure out what size piston you need if there's no data plate?
I use the adp piston chart. do a Google search and the pdf shows up
+Town & Country Air does it work for all makes and models?
+Familia Sanchez HVAC it will get you close. Seer rating and manufacturers are different but it gives you a ballpark
Ok thank you!
good
I have a new 2 ton R410a installed
It is not cooling as cool as the old r22 unit
I checked the charge and superheat is 2 , subcooling is around 0
I'm telling the tech that installed it that the piston is probably TOO BIG
They are going to come back and check
I'm getting them to install a TXV valve instead of piston
What do you think ?
+Sofjan Mustopoh sounds like you may be correct. Brand?
It is a goodman outdoor unit. and US ALUMACOIL COMPANY inside coil / unit . Moedl no CHPF2430B6CB
it likely has a 2.5 ton piston
Now that i read the model number 2430 . im thinking you are right it probably come with 2.5tons piston and the installing tech did not swap it out. thanks. they haven't stop by to get it fixed yet. Since i'm getting them to install the TXV . do you think the extra complexities is worth the efficiency ? Thanks
Working Joes Roundtable the technician come by and replace the piston orifice with TXV
He still give all kind of excuse
Including moving the thermostat from current location
I told him
Just install the TXV
The current thermostat location is fine for the last 15 years
After the install is done
Bam
The AC is cool enough for the penguin
I would never use his company anymore
I can fathom why people just can't fess up when they make mistake
Just an update
Thanks
It is called a piston because it pushes back and forward depending if it is in the cooling or heating mode, correct?
At the time I posted the question I was learning this HVAC stuff from bits and pieces I was watching on these channels. Actually the piston is a fixed orifice that does not slide back and forward like the piston in a car engine like the name suggests. The check valve accomplishes this feat. A lot of times these technicians will not answer a question because they are afraid this will encourage a novice like myself to try self repairs thus causing harm to the system or bodily harm. I certainly was confident in my theory in my earlier post wasn't I. Thank you for your inquiry.
There is no danger in someone watching one video and actually repairing a system. I have used a little of my spare time on the weekends for about a year and I still have difficulties wrapping my mind around all of the different aspects of this business. The best place I found to 'jump on' was the properties of the refrigerants and how the refrigerant accomplishes the transfer of hot and cold air. I agree that this is a tough club to get in if one is not already working in this trade. But I will still accept the few crumbs they throw out until I have enough to make a sandwich.
+Daniel Baker In the a/c mode the piston moves forward with the flow of the refrigerant and acts as a fixed orifice metering device. In heat pump mode the three way valve reverses the flow of the refrigerant pushing the piston backwards exposing more holes and allowing more refrigerant to flow thru now allowing the condenser to act as a evaporator and absorb heat from the out side air.
gearhead0800 I really appreciated your input...so I actually had it right the first time. Thank you for the correction. Does the check valve meter the direction of the flow of the refrigerant or the amount of the refrigerant?
+Daniel Baker the piston is actually more of a directional then a check valve as we normally think of a check valve. The direction of refrigerant flow is determined by the three-way valve. The piston when positioned forward for refrigeration acts as a fixed orifice and restricts the refrigerant from a high pressure liquid to a low pressure liquid. when the refrigerant enters the evaporator the low pressure liquid absorbs heat from the air passing over the evaporator. Two things occurs here the air is cooled by having heat removed and the refrigerant is converted from a low pressure liquid to a low pressure gas. The Change of state of the refrigerant IS the refrigerating effect.
do you have to drain the gas to do that
Yes. This was a new install, but to change pistons you would have to pump the system down.
What happens if you don’t put the piston in the distributor in a Goodman of 3 tons?
nice!!!!
Not a Hvac tech, But when you opened up that connection to replace the piston would the freon not escape
Refrigerant has been removed
Nice video. No customer message yet?!?! Lol
I am lazy.....
👍
I went to a follow up call with a senior tech because a heat pump wasn't working properly. Tenants were using a dehumidifier to keep comfortable. The piston had been installed wrong.
Doesn’t help if you don’t show the whole process to replace it.
I thought I was the only one that could drop something and it disappear.
You forgot Dr Z HVAC
No matter how many times I install/change the piston I always worry I'll put it in backwards. 🤷♂️
Most of the time I'm just putting in a TXV but for my cheap ass landlord customers who will just replace the condenser they're not going to pay for a TXV if they don't have to.
Is the TXV better than the piston valve? Or do they serve the same purpose?
My flow is restricted when I play skilled trade up 🤬
I feel your day is coming. I don't know what will happen but its coming.
It will disappear forever! hahahhaha
Hi can I install a 4 tons evaporator coil to a 3 tons condenser unit thanks
No