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re: Any HVAC Professionals?
Posted on 5/7/19 at 3:17 pm to MayhemMike
Posted on 5/7/19 at 3:17 pm to MayhemMike
Many things could be wrong here....
first question I have is, is the 4 Ton unit just the size of the air handler or is that the size of the coil?
If that is the size of the coil, then yes that can contribute to the humidity levels because it would have very little latent cooling capacity. The interior coil won't be getting cold enough to pull moisture out of the air.
If the indoor coil is sized properly (2.5 ton) then it could be just a CFM setting issue. This would mean they have set the CFM level in the AHU too high resulting in no latent cooling capability.
EDIT: Is it common? Yes. Many times manufacturers can pair a larger interior coil with a smaller outdoor unit to increase the SEER rating. The cost of doing this is losing de-humidification capability (or latent cooling). Most of the time though you would only see a mismatch of 0.5 to 1 ton. 1.5 ton would be a drastic difference.
first question I have is, is the 4 Ton unit just the size of the air handler or is that the size of the coil?
If that is the size of the coil, then yes that can contribute to the humidity levels because it would have very little latent cooling capacity. The interior coil won't be getting cold enough to pull moisture out of the air.
If the indoor coil is sized properly (2.5 ton) then it could be just a CFM setting issue. This would mean they have set the CFM level in the AHU too high resulting in no latent cooling capability.
EDIT: Is it common? Yes. Many times manufacturers can pair a larger interior coil with a smaller outdoor unit to increase the SEER rating. The cost of doing this is losing de-humidification capability (or latent cooling). Most of the time though you would only see a mismatch of 0.5 to 1 ton. 1.5 ton would be a drastic difference.
This post was edited on 5/7/19 at 3:20 pm
1
Posted on 5/7/19 at 3:30 pm to notsince98
quote:
1.5 ton would be a drastic difference.
I agree. I had a Lennox 4 and 5 ton system paired on the last house I built and it worked fine. I didn’t even know that they were different sizes until it came up on an inspection when I was selling.
If you look up your specific model number’s manual online it will tell you which model coils and condensers are supported to be matched by Lennox.
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