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I have a carrier 25HCD448A300, trying to figure out if I

I have a carrier 25HCD448A300JA: I'll do all I can to help. How long have you been dealing with this?Customer: trying to figure out if I test w superheat or subcooling methodJA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: noJA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.

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Airheatman

Heating & Air Conditioning Contractor

6 years college

 
9,390 satisfied customers
Can an carrier hvac unit which uses r12 freon use the 434a (

Can an carrier hvac unit which uses r12 freon use the 434a ( rs44)JA: Just to clarify, what type of HVAC system is this? Single, multi-staged, or zoned?Customer: Model # *****JA: Do you plan on doing the work yourself?Customer: No. I'm retired from the business. Have contractor in mine. However want to educate myselfJA: Anything else we should know to help you best?Customer: That's itJA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.

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HVAC Guru

Service Technician

Associate Degree

 
22,662 satisfied customers
I am a Hvac mechanic having a problem with a carrier 650ton

Good morning.I am a Hvac mechanic having a problem with a carrier 650ton credit.it will start run for about 4 minutes and trips on excessive comp surge.we have flow meters on both chw and cw lines and both basically in spec.entering cw is 76 entering.78 leaving cw 80.1 so 1.2 difference chw 52.5 51.1 evap 48.8 amp,62percent.I am thinking it is the transducer or what ever initiated the fault but cannot locate or find on diagram I would appreciate your input thank you Bill

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Phil

Consultant to Engrs, Govt & Contractors

Degree, Mech Engr Technology

 
9,514 satisfied customers
I recently purchased a Lennox AC unit. After it shuts off it

I recently purchased a Lennox AC unit. After it shuts off it goes through a series of sounds that drones on like an airplane landing. The AC company says everything is fine, but the noise alone is very annoying going on for 15 seconds after it shuts off. It seems that the manager that finally came was able to adjust it to lessen the volume of the noise, but it still occurs. The only explanation I got was its probably my metal ductwork loosening and causing the sound and that they don't know why it makes that sound, but everything is fine. Help! I paid $12,000 for the system and I feel like it's defective. I've lived here 20 years and had a Trane and Carrier that never made these sounds. Thank you.

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Phil

Consultant to Engrs, Govt & Contractors

Degree, Mech Engr Technology

 
9,514 satisfied customers
I have a carrier supra 750 that keeps cutting off on alt aux

I have a carrier supra 750 that keeps cutting off on alt aux alarm code after running for about 60 seconds. Oil level is good.

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HVAC Guru

Service Technician

Associate Degree

 
22,662 satisfied customers
My Carrier Infinity Thermostat always reads 80 deg even

My Carrier Infinity Thermostat always reads 80 deg even though the temperature is varying and the system will still cool if the set temp is low enough ( say 68deg).Where can I purchase a new Thermostat?Does the 960-030-130 Rev. F number on the back mean anything?

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Tim H.

Lead building engineer

Vocational, Technical or Trade Scho

 
4,554 satisfied customers
My carrier infinity thermostat shows the AC is off and won't

my carrier infinity thermostat shows the AC is off and won't cool all rooms and the temperature won't go down.

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BillyHvac

Journeyman Service Technician

State Licensed Mechanical Contractor

 
11,444 satisfied customers
My carrier infinity just gave me an error 82 82-THERMAL

my carrier infinity just gave me an error 8282-THERMAL LOCKOUT IN HIGH STAGE 4 HOURSany chance I get this running without a service call? Saturday night 11:30 pm, going to be almost 100 degrees tomorrow.

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Phil

Consultant to Engrs, Govt & Contractors

Degree, Mech Engr Technology

 
9,514 satisfied customers
It's a bit of story. I recently red a new HVAC service

It's a bit of long story. I recently hired a new HVAC service company after I learned that the company I had previously hired to service the two Carrier rooftop units that heat and cool our condominium in Brooklyn, NY had stopped doing residential work a year before and neglected to inform me of that fact. This meant that the units, which are six years old, had not been serviced, or had their filters changed, in over a year. I explained this to the new technician when he arrived to service the units. He removed the old filters, which were badly clogged, checked out the two units, told me that the filters should be changed every three months, and showed me how to do that. He did not have the replacement filters we needed, but he suggested that I simply order them from Amazon, and assured me that running the units for a couple of days without filters would not hurt them. I ordered four new filters to match the size of the four filters he removed. They came the next day, but when I went to install them, I discovered that they were not the right size. The old HVAC company had installed filters that did not fit the filter mounts; they were slightly shorter and wider, which meant that they had to overlap. This also meant that there were gaps around the edges of the filters.I've since reordered and installed the right size filters, but my question is: Given that these units have been operating for more than a year with ill-fitting and clogged intake filters, is there anything more I should have done to the units to offset the effects of this bad maintenance? The units have been heating and cooling our apartment, though probably not all that efficiently. Now that I know how to do it myself, I am going to be diligent about replacing the filters every three months. But I'm wondering whether insides of the units should be cleaned, given the amount of dirt that has passed through them in the past year.

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Rick

Owner

 
22,982 satisfied customers
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