I have a Carrier Heat Pump system with a FV4BNF005 air handler. I just replaced the thermostat with a Carrier TP-PRH01-A. The previous model thermostat was a Carrier TSTATCCPRH01-B. With the previous model thermostat the air handler's variable speed fan would run in high speed most of the time. With the new thermostat, the air handler's variable speed fan does not run at the higher speed, at least not yet. I have only had the thermostat installed for a few hours. I have checked and
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double-checked the wiring from the air handler to/from the new thermostat and I have compared the wiring to the way the old thermostat was wired. Everything appears to be wired correctly. What ideas and suggestions do you have? Any and all ideas would be greatly appreciated.
So John, are you still having the same issue? After a couple of more days with this new system, has it still not hit high speed, and is there a difference in temperature and comfort?
Here is the final outcome of the investigation on this issue. A jumper wire had to be added to the thermidistat connecting the R (Rc or Rh) terminal to the D1 terminal. Without the jumper wire, the thermidistat was making the air handler think it should run in dehumidify mode, thus causing the fan to run at slow speed. Once the jumper was added, the fan ran normally. The air handler has a variable speed fan, so the fan would start at a slower speed and then increase in speed to cool the
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house more efficiently.
I hope this post will assist others who may also experience this issue.
I wish I could say yes but the answer is no. I had called my air conditioner servicing company and they sent a technician out. We went through the documentation thoroughly and together we discovered the jumper wire needed to be put in place on the thermidistat. This thermidistat has around 50 configuration options that need to be setup as well. If one is to install this thermidistat on their own, please take time to step through each configuration option and select the proper setting.
Well, it sounds like it was a tough nut to crack. Sorry you went through this, but it's great that you posted it here for others to learn from the experience.
I hope this post will assist others who may also experience this issue.