At time of installation, my furnace was showing frequent 33-LIMIT FAULT errors.
The installer played with all the settings, increased the intake duct size slightly, and told me to use the lowest MIRV filters with max airflow.
Generally it has been working well. LIMIT FAULTS after about 3 months indicate time to change filter.
However, now with Covid and wildfires I want to use higher MIRV filters. When I do, I see frequent 33-LIMIT FAULTs. Is there anything I can do to allow higher MIRV filters (short of adding more ducts)?
Does the information displayed when I do a vent check give me any meaningful diagnostic info:
full system CFM: 1400
static pressure 0.86
blower RPM: 1065
(I reran vent check with different MIRV filters and the numbers are essentially the same)
Other than trial and error, how can I determine the max MIRV I can use before seeing a LIMIT FAULT. Is there anything I can change to allow high MIRV filters? Please help.
Thanks!
The installer played with all the settings, increased the intake duct size slightly, and told me to use the lowest MIRV filters with max airflow.
Generally it has been working well. LIMIT FAULTS after about 3 months indicate time to change filter.
However, now with Covid and wildfires I want to use higher MIRV filters. When I do, I see frequent 33-LIMIT FAULTs. Is there anything I can do to allow higher MIRV filters (short of adding more ducts)?
Does the information displayed when I do a vent check give me any meaningful diagnostic info:
full system CFM: 1400
static pressure 0.86
blower RPM: 1065
(I reran vent check with different MIRV filters and the numbers are essentially the same)
Other than trial and error, how can I determine the max MIRV I can use before seeing a LIMIT FAULT. Is there anything I can change to allow high MIRV filters? Please help.
Thanks!
source https://hvac-talk.com/vbb/showthread.php?2223783-Bryant-Frequent-33-LIMIT-FAULT&goto=newpost
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