Timeline for Why is humidity high from one unit but not the other?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Sep 11, 2015 at 16:14 | comment | added | user39367 | Having too much air for the compressor does cause higher humidity than when the two are correctly matched. If the old blower capacitor was weak, then when you installed a new one you increased the airflow and now the compressor cannot keep up. | |
| Sep 11, 2015 at 16:02 | comment | added | user39367 | It's possible that cycling due to the thermostat is an issue but that's not high on my list of suspects (unless the tstat is directly under a supply vent). If I were looking at this I would check the discharge temp, condenser split, airflow, refrigerant charge and compressor performance. Matching the airflow to a low charge or a worn compressor may compensate somewhat. The 25F evaporator temp split is a hard limit. 20F would be safer. New units sometimes run about 15F (and they remove less moisture). When the ambient air is dry the evap temp split will increase compared to being humid. | |
| Sep 11, 2015 at 4:52 | comment | added | eliza1 | What continues to bug me is that we didn't have this humidity problem before I "fixed" a different issue a couple of months ago. The fix involved a new capacitor on the blower, a new contactor, and a new thermostat. Ultimately, I don't think the old thermostat was bad, but I changed it out before I had done diagnostics on the other parts. So let me ask you this: could the new thermostat be turning the system on more frequently than the old one, and therefore the system is now running for less time than before? Like there is less tolerance in temperature variation from the programmed temp? | |
| Sep 11, 2015 at 4:48 | comment | added | eliza1 | Chris - thanks for your insight. On #1, the unit is not oversized, so we'll put that one to rest. On #2 - great insight - I can't wait to check this out tomorrow/Saturday. I will report back. | |
| Sep 10, 2015 at 15:28 | history | edited | user39367 | CC BY-SA 3.0 |
added 95 characters in body; deleted 9 characters in body
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| Sep 10, 2015 at 15:21 | history | answered | user39367 | CC BY-SA 3.0 |