New system installed 7/10/20 (specs below). One of the main concerns I had prior to purchase was indoor humidity and was told this system would work be great.
Thus far that hasn't been our experience. The installer has been back twice to investigate. They agree the humidity should never reach the levels it is (+70% when set at 56%) and that it and the temperature should remain relatively static given the variable speed. During the 2nd trip the installer felt the answer was to use the Ecobbe thermostat's "overcool" feature where it allows the system to run up to 3 degrees lower than the desired temperature IF the system hasn't reached the desired humidity level. Well, we're just cold now. :-(
My assumption is either:
- The dehumidification isn't working and/or working as well as it should
- The system isn't running at a low enough fan speed to allow the system to run longer to dehumidify but not freeze us out
Here's what's been installed:
- Carrier® Performance™ - 3.5 Ton 16 SEER Air Conditioning Condenser
- Model: 24apb642a003
- Product: 24apb642a0030010
- 24 = AC / Product Series
- A = RES AC / Product Family
- P = Performance Series / Tier
- B = Puron / Major Series
- 6 = 16 SEER / SEER
- 42 = 3.5 Ton / Cooling Capacity
- A = Standard / Grille Variations
- 0 = Not Defined / Open
- 0 = Not Defined / Open
- 3 = 208/230-1 / Voltage
- Carrier 3.5 Ton Evaporator N Coil Cased Horizontal Painted 21" Width (Aluminum)
- Model CNPHP4321ALAEAAA
- C = Coil Product
- N = N Coil Type
- P = Puron® Refrigerant TXV Refrigerant Type
- H = Horizontal Coil Configuration
- P = Painted Cabinet Finish
- 43 = 3.5 Ton Unit Capacity
- 21 = 21" in (533 mm) Cabinet Width
- A = 1st Revision Level
- L = Aluminum Tubing Design
- A = Basic Variations
- Carrier Carrier® Performance™ - 80% AFUE 90000 Btuh 4-Way Multipoise Induced-Combustion Gas Furnace, 2-Stage, Variable-Speed
- Model: 58TP0A090V211120
Here's a graph showing humidity quickly decreasing when the system is running...and then quickly increasing when it's not:
- Blue rectangles: when the system is running
- White line: indoor humidity level
- Green: outdoor humidity
Here's a graph showing the system consistently "overcooling" past the desired temperature:
- Blue rectangles: when the system is running
- Blue line: desired (cool) temp
- White line: indoor temperature
- Green: outdoor temperature
Thus far that hasn't been our experience. The installer has been back twice to investigate. They agree the humidity should never reach the levels it is (+70% when set at 56%) and that it and the temperature should remain relatively static given the variable speed. During the 2nd trip the installer felt the answer was to use the Ecobbe thermostat's "overcool" feature where it allows the system to run up to 3 degrees lower than the desired temperature IF the system hasn't reached the desired humidity level. Well, we're just cold now. :-(
My assumption is either:
- The dehumidification isn't working and/or working as well as it should
- The system isn't running at a low enough fan speed to allow the system to run longer to dehumidify but not freeze us out
Here's what's been installed:
- Carrier® Performance™ - 3.5 Ton 16 SEER Air Conditioning Condenser
- Model: 24apb642a003
- Product: 24apb642a0030010
- 24 = AC / Product Series
- A = RES AC / Product Family
- P = Performance Series / Tier
- B = Puron / Major Series
- 6 = 16 SEER / SEER
- 42 = 3.5 Ton / Cooling Capacity
- A = Standard / Grille Variations
- 0 = Not Defined / Open
- 0 = Not Defined / Open
- 3 = 208/230-1 / Voltage
- Carrier 3.5 Ton Evaporator N Coil Cased Horizontal Painted 21" Width (Aluminum)
- Model CNPHP4321ALAEAAA
- C = Coil Product
- N = N Coil Type
- P = Puron® Refrigerant TXV Refrigerant Type
- H = Horizontal Coil Configuration
- P = Painted Cabinet Finish
- 43 = 3.5 Ton Unit Capacity
- 21 = 21" in (533 mm) Cabinet Width
- A = 1st Revision Level
- L = Aluminum Tubing Design
- A = Basic Variations
- Carrier Carrier® Performance™ - 80% AFUE 90000 Btuh 4-Way Multipoise Induced-Combustion Gas Furnace, 2-Stage, Variable-Speed
- Model: 58TP0A090V211120

Here's a graph showing humidity quickly decreasing when the system is running...and then quickly increasing when it's not:
- Blue rectangles: when the system is running
- White line: indoor humidity level
- Green: outdoor humidity
Here's a graph showing the system consistently "overcooling" past the desired temperature:
- Blue rectangles: when the system is running
- Blue line: desired (cool) temp
- White line: indoor temperature
- Green: outdoor temperature
source https://hvac-talk.com/vbb/showthread.php?2222304-New-system-not-dehumidifying&goto=newpost
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