Hi, thank you for letting me be part of the group. I recently was given a 3 year old Goodman 3 ton heat pump (model SSZ140361BB outdoor unit and model AVPTC36C14AA air handler with 10kW backup indoor). My problem is
1. The duct work is very loud. Five inch ducts. The blower speed is set at 1000 cfm per minute as indicated by the flashing LED and how i configured the dip switches under my installers direction. Originally it was set at 1300 and was really really loud.
2. If i dont have all my registers removed for clear flow and the returns clear it flips to fault code B3 and sends the fan into overdrive like a rocket is taking off and the auxillary heat comes on. As i understand it, it has to much pressure to move the heat off the coil and satisfy it request so after a while it switches to the aux to heat the house and increase the thermostat? Why exactly is it doing this and is the fix simply more duct work to allow more exhaust air to move more freely?
Return duct work feeds in the air handler by a 8x24 inch duct (seems a little small?) and their are 13 registers at 5 inches with 5 40 foot of long runs to take away heat. it is a 1980's house retrofitted.
Installer, who is cumming back on Saturday to do the duct work i mention tells me updating the duct runs from 5 to 6 will noticeably and considerably improve the noise and adding another 8 inch round return air to the system will help as well. I don't doubt his skill or ability but I am skeptical it will be a profound improvement. He also didnt use the larger supply duct i had which was insulated because he though it was overkill and took up to much space. I am looking for quite and this free heat pump is starting to cost a lot of money where it replaced a perfectly good oil furnace.
thanks for your help.
1. The duct work is very loud. Five inch ducts. The blower speed is set at 1000 cfm per minute as indicated by the flashing LED and how i configured the dip switches under my installers direction. Originally it was set at 1300 and was really really loud.
2. If i dont have all my registers removed for clear flow and the returns clear it flips to fault code B3 and sends the fan into overdrive like a rocket is taking off and the auxillary heat comes on. As i understand it, it has to much pressure to move the heat off the coil and satisfy it request so after a while it switches to the aux to heat the house and increase the thermostat? Why exactly is it doing this and is the fix simply more duct work to allow more exhaust air to move more freely?
Return duct work feeds in the air handler by a 8x24 inch duct (seems a little small?) and their are 13 registers at 5 inches with 5 40 foot of long runs to take away heat. it is a 1980's house retrofitted.
Installer, who is cumming back on Saturday to do the duct work i mention tells me updating the duct runs from 5 to 6 will noticeably and considerably improve the noise and adding another 8 inch round return air to the system will help as well. I don't doubt his skill or ability but I am skeptical it will be a profound improvement. He also didnt use the larger supply duct i had which was insulated because he though it was overkill and took up to much space. I am looking for quite and this free heat pump is starting to cost a lot of money where it replaced a perfectly good oil furnace.
thanks for your help.
source https://hvac-talk.com/vbb/showthread.php?2224038-Help-Goodman-air-handler-3-ton-B3-code-and-duct-sizing&goto=newpost
No comments:
Post a Comment