Hi all,
I hope this is the right spot for this. North East PA location. We recently finished most of our basement while leaving some mechanical area unfinished. Total space is 2,000 - 2,100 sq ft.
Contractor installed a Mitsubishi heat pump that gets hw from the oil fired boiler for make up heat as needed. Heat ran maybe twice this winter (basement stays right about 65 to 66). Ac ran last cooling season but humidity in basement sat around 50 to 51% and the drying setting on the hp wasn't enough to keep it down where we'd like it. Always knew dehum might be needed since we ran 2 portable ones before it was finished.
Hp unit sits in unfinished space. Exterior door seals it from finished space and there's a hidden finished room off unfinished also with exterior door so there's the main return from finished space plus a supply and return each in unfinished and hidden room.
Contractor installed Honeywell dr65a3000 unit and put the humidistat right at the return since I didn't want another controller out on the main wall. Main return is tapped into Honeywell then supply of Honeywell goes into supply trunk of hp. When they installed, I asked the tech why we had to change mitsu controller to "system off" and fan to l/m/h manually as that seemed like a pain. Can't have main system fan on not auto while "system" is set to anything but off. Said that's just how it is (even tho in earlier discussions owner told me differently). I read up and Honeywell recommends and gives wiring for main hp fan to come on with dehum AND leaving system in auto so it does heat/dry/cool as needed so I am "discussing" when they're coming to address that nonsense.
They set the dehum controller to 30 and said let it run. It never got below 38 (from original 48) after 5 days so I put controller to 40 and just turned main fan to low but left it always on. So my questions...
1.) I don't need 30% but I'd like to see 35%. Shouldn't this Honeywell be able to get there? Seems 38 is even tough as 40% where it is now runs all the time. I did notice that the drain line out RIGHT at the unit seems to be tipped towards the unit. I stuck my finger in the cap and the horizontal stub out of the unit has water in it and if I press down hard enough a big "glug" of water drains. I have a theory that after the initial high flow, because the thing isn't draining, the water is just flowing back in and its fighting myself. Does that sound logical? I raised this to the owner after a few days of no rph movement but nothing was said (I'm tempted to just replumb the drain myself)
2.) I saw in the manual that Honeywell recommends running the system fan when dehum kicks when it's ducted the way it is (working on that with contractor) but also says it REQUIRES a baffle on the supply side of the dehum which we don't have. Presumably this is to prevent issues when the ac/heat kicks in? I called this out to the owner and no response there either. Wondering what your thoughts are there?
I know this is long but I hope I've provided enough details. If there's anything else that would be helpful or pictures please let me know.
Sent from my SM-G892A using Tapatalk
I hope this is the right spot for this. North East PA location. We recently finished most of our basement while leaving some mechanical area unfinished. Total space is 2,000 - 2,100 sq ft.
Contractor installed a Mitsubishi heat pump that gets hw from the oil fired boiler for make up heat as needed. Heat ran maybe twice this winter (basement stays right about 65 to 66). Ac ran last cooling season but humidity in basement sat around 50 to 51% and the drying setting on the hp wasn't enough to keep it down where we'd like it. Always knew dehum might be needed since we ran 2 portable ones before it was finished.
Hp unit sits in unfinished space. Exterior door seals it from finished space and there's a hidden finished room off unfinished also with exterior door so there's the main return from finished space plus a supply and return each in unfinished and hidden room.
Contractor installed Honeywell dr65a3000 unit and put the humidistat right at the return since I didn't want another controller out on the main wall. Main return is tapped into Honeywell then supply of Honeywell goes into supply trunk of hp. When they installed, I asked the tech why we had to change mitsu controller to "system off" and fan to l/m/h manually as that seemed like a pain. Can't have main system fan on not auto while "system" is set to anything but off. Said that's just how it is (even tho in earlier discussions owner told me differently). I read up and Honeywell recommends and gives wiring for main hp fan to come on with dehum AND leaving system in auto so it does heat/dry/cool as needed so I am "discussing" when they're coming to address that nonsense.
They set the dehum controller to 30 and said let it run. It never got below 38 (from original 48) after 5 days so I put controller to 40 and just turned main fan to low but left it always on. So my questions...
1.) I don't need 30% but I'd like to see 35%. Shouldn't this Honeywell be able to get there? Seems 38 is even tough as 40% where it is now runs all the time. I did notice that the drain line out RIGHT at the unit seems to be tipped towards the unit. I stuck my finger in the cap and the horizontal stub out of the unit has water in it and if I press down hard enough a big "glug" of water drains. I have a theory that after the initial high flow, because the thing isn't draining, the water is just flowing back in and its fighting myself. Does that sound logical? I raised this to the owner after a few days of no rph movement but nothing was said (I'm tempted to just replumb the drain myself)
2.) I saw in the manual that Honeywell recommends running the system fan when dehum kicks when it's ducted the way it is (working on that with contractor) but also says it REQUIRES a baffle on the supply side of the dehum which we don't have. Presumably this is to prevent issues when the ac/heat kicks in? I called this out to the owner and no response there either. Wondering what your thoughts are there?
I know this is long but I hope I've provided enough details. If there's anything else that would be helpful or pictures please let me know.
Sent from my SM-G892A using Tapatalk
source https://hvac-talk.com/vbb/threads/2228548-Questions-about-Honeywell-dehumidifier?goto=newpost
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