I had some issues with my installers and I had to get another HVAC guy to assist. Now I am trying to determine if there are other issues. I have really become fascinated with the heat pump inverter technology since I got the unit and welcome any information on how I can optimize my current set up.
Equipment
It's a dual fuel system, where the gas is locked out at 35 degrees. The furnace is LP.
Issue
I was getting constant High Pressure Lockouts when my Heat Pump was attempting to kick on around the 40 degree area and then my gas would come on. I had a separate HVAC guy come and he worked with the manufacturer to get the best estimate as to what the refrigerant should be and he removed 2.1 LBs of 401A. Since then, no lock outs and it seems to be running pretty good. However, he also mentioned that my duct work may be undersized (the installers also reduced my duct works load capacity - reduced my return from 14x14 to a 12in flex) and that these units like to run at .5 static pressure, but he left it up to me to fight with my installer since they have a 5 yr labor warranty.
** Note I complained to the installers 3 separate times. I had detailed dates and times of when the faults were occurring. They said this is how it works, you should just run your gas furnace more.
Questions
If you got this far, I appreciate the time! Thanks
Equipment
It's a dual fuel system, where the gas is locked out at 35 degrees. The furnace is LP.
- HVH837GKA - HP = 3TON
- ENH4X36L17A - Evap Coil
- G96CTN0601714A - Furnace
- SYST010CW - Thermostat
Issue
I was getting constant High Pressure Lockouts when my Heat Pump was attempting to kick on around the 40 degree area and then my gas would come on. I had a separate HVAC guy come and he worked with the manufacturer to get the best estimate as to what the refrigerant should be and he removed 2.1 LBs of 401A. Since then, no lock outs and it seems to be running pretty good. However, he also mentioned that my duct work may be undersized (the installers also reduced my duct works load capacity - reduced my return from 14x14 to a 12in flex) and that these units like to run at .5 static pressure, but he left it up to me to fight with my installer since they have a 5 yr labor warranty.
** Note I complained to the installers 3 separate times. I had detailed dates and times of when the faults were occurring. They said this is how it works, you should just run your gas furnace more.
Questions
- For a high efficiency system like this what is the recommended static pressure when its running at 1200 CFM? Currently its around 0.85.
- Does the manufacturer call this out somewhere? I looked through he manuals and found nothing.
- Are there any performance configurations on the thermostat that someone would recommend (like EFF vs comfort? or anything really)? My goal is to use the heat pump as much as possible as long as it can keep up. My heat loss on this floor is 33.1MB/hr.
- Any insight or domain knowledge you have about these types of units that would be interesting?
If you got this far, I appreciate the time! Thanks
source https://hvac-talk.com/vbb/threads/2235296-HEIL-Inverter-HP-Installer-Issue-and-Addl-Questions?goto=newpost
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