Hi All,
I’ve enjoyed learning in this forum. Hoping someone can shed some light on my new central AC issue.
Last summer I had a new furnace and central AC system sold and installed at my house by a reputable local HVAC company.
After installation, the AC worked fine for about an hour and was cooling the house toward the set temperature of 75F / 24C. The outside temperature was about 90F / 32C. The compressor was humming quietly as usual.
After an hour, the compressor hum suddenly got VERY loud. I could hear it from inside at the opposite end of the house. Outside, the humming could be heard from 2 houses down, above all the other AC units. Warm air was coming out of the registers and the whole system shut itself off after about a minute of loud humming. The system automatically started back up again after a few minutes, and cooling resumed as if nothing happened.
I called the installers back to look, and everything looked fine to them.
That same day, the system operated for a few more hours without issue, and then the issue happened again in the evening. The next morning, the installers returned, replaced the refrigerant, increased the fan speed, checked pressures, and monitored the system for a couple of hours as it operated. Everything appeared to be fine.
The system ran for a few days without issue. Then the issue happened again one hot afternoon after running fine for a few hours.
I noticed that when the system runs for a few hours, the housing on the evaporator coil is cold to the touch, and part of the duct above the coil it has condensation on the exterior. I don’t think the coil is freezing up, because the system resumes normal operation after just a few minutes. Could it be minor partial freezing? I have a 2 ton condenser and, for some reason, a 3 ton evaporator coil. Is the coil too large and not getting even airflow?
I called the sales rep asking to replace the whole AC system, but no response. The weather cooled down and I put the issue to rest for a while. The AC unit has a 5 year warranty with full replacement if it malfunctions more than 3 times.
I expect this issue will keep happening next summer.
Any ideas what the issue may be? The local HVAC company isn't having any luck.
Equipment:
Furnace: Carrier Performance Series Gas Furnace - 59TP6 – 60,000 BTU
Condenser: Carrier Comfort 12 – 24ABB3 – 2.0 ton
Evaporator: Carrier 3.0 Ton (why did they install a 3 ton evaporator with a 2 ton condenser?)
Lines: Same lines from old system were re-used. Visually, they look OK.
Thermostat: Nest 3rd Gen
House:
1450sq ft detached, brick, 2 storey
Built in year 2000
Ontario, Canada
The furnace is in the basement, and the condenser unit is only a few feet away, at the side of the house. The lines are 10ft at most.
Thanks for reading.
I’ve enjoyed learning in this forum. Hoping someone can shed some light on my new central AC issue.
Last summer I had a new furnace and central AC system sold and installed at my house by a reputable local HVAC company.
After installation, the AC worked fine for about an hour and was cooling the house toward the set temperature of 75F / 24C. The outside temperature was about 90F / 32C. The compressor was humming quietly as usual.
After an hour, the compressor hum suddenly got VERY loud. I could hear it from inside at the opposite end of the house. Outside, the humming could be heard from 2 houses down, above all the other AC units. Warm air was coming out of the registers and the whole system shut itself off after about a minute of loud humming. The system automatically started back up again after a few minutes, and cooling resumed as if nothing happened.
I called the installers back to look, and everything looked fine to them.
That same day, the system operated for a few more hours without issue, and then the issue happened again in the evening. The next morning, the installers returned, replaced the refrigerant, increased the fan speed, checked pressures, and monitored the system for a couple of hours as it operated. Everything appeared to be fine.
The system ran for a few days without issue. Then the issue happened again one hot afternoon after running fine for a few hours.
I noticed that when the system runs for a few hours, the housing on the evaporator coil is cold to the touch, and part of the duct above the coil it has condensation on the exterior. I don’t think the coil is freezing up, because the system resumes normal operation after just a few minutes. Could it be minor partial freezing? I have a 2 ton condenser and, for some reason, a 3 ton evaporator coil. Is the coil too large and not getting even airflow?
I called the sales rep asking to replace the whole AC system, but no response. The weather cooled down and I put the issue to rest for a while. The AC unit has a 5 year warranty with full replacement if it malfunctions more than 3 times.
I expect this issue will keep happening next summer.
Any ideas what the issue may be? The local HVAC company isn't having any luck.
Equipment:
Furnace: Carrier Performance Series Gas Furnace - 59TP6 – 60,000 BTU
Condenser: Carrier Comfort 12 – 24ABB3 – 2.0 ton
Evaporator: Carrier 3.0 Ton (why did they install a 3 ton evaporator with a 2 ton condenser?)
Lines: Same lines from old system were re-used. Visually, they look OK.
Thermostat: Nest 3rd Gen
House:
1450sq ft detached, brick, 2 storey
Built in year 2000
Ontario, Canada
The furnace is in the basement, and the condenser unit is only a few feet away, at the side of the house. The lines are 10ft at most.
Thanks for reading.
source https://hvac-talk.com/vbb/showthread.php?2226153-New-Central-AC-Issue&goto=newpost
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