Giantsean
Member
Hi All,
Sorry to bring up the exact same conversation every single winter, but I am having some problems getting my downstairs warm now that the weather has turned. It appears that about 20 degrees outside temp and I start to have problems. Add wind and it's worse.
I have a Navien CH-240 feeding a TAM7 air handler w/ a 42K BTU (noted, ideal conditions) hydro coil, which is dedicated to the 1st floor and split into two zones. The maximum distance from the AH to the farthest register is about 50ft. I have done a LOT of work buttoning up the downstairs - replaced windows, applied insulation where there was none, air sealed, but I just cannot get the 1st floor past 65 on a cold day. I have tried tuning the TAM for maximum airflow, but it almost seems like the problem is that it is lukewarm air by the time it comes out of the registers. It makes me wonder if heat is actually being removed from this coil or whether there is some weird ducting problem elsewhere.
I also tried upping the supply temp on the Navien to 180. Just as last year, I can get it to peak in the high 170's but it kicks off fast and throttles back to the 160 area. Some have told me it is because return temp is too high. I have unplugged the ODR and left the remote to try to dial in the supply temp, but it still seems to do whatever it wants.
At this point I almost don't even know where to begin. I really don't understand why it's so difficult to get this place warm!
Thank you for any advice
Sorry to bring up the exact same conversation every single winter, but I am having some problems getting my downstairs warm now that the weather has turned. It appears that about 20 degrees outside temp and I start to have problems. Add wind and it's worse.
I have a Navien CH-240 feeding a TAM7 air handler w/ a 42K BTU (noted, ideal conditions) hydro coil, which is dedicated to the 1st floor and split into two zones. The maximum distance from the AH to the farthest register is about 50ft. I have done a LOT of work buttoning up the downstairs - replaced windows, applied insulation where there was none, air sealed, but I just cannot get the 1st floor past 65 on a cold day. I have tried tuning the TAM for maximum airflow, but it almost seems like the problem is that it is lukewarm air by the time it comes out of the registers. It makes me wonder if heat is actually being removed from this coil or whether there is some weird ducting problem elsewhere.
I also tried upping the supply temp on the Navien to 180. Just as last year, I can get it to peak in the high 170's but it kicks off fast and throttles back to the 160 area. Some have told me it is because return temp is too high. I have unplugged the ODR and left the remote to try to dial in the supply temp, but it still seems to do whatever it wants.
At this point I almost don't even know where to begin. I really don't understand why it's so difficult to get this place warm!
Thank you for any advice