||04-11-2007 07:01 AM
HVAC humidifier issue
I recently installed a Carrier Infinity 96 LP HVAC system. During the quoting phase I decided to install a air exchange unit because the renovation was going to make the house pretty tight. the salesman mentioned I probably would not need a humidifier. It was my fault for not checking the quote so the unit was installed w/o it. I decided I wanted to have one so they installed a flow thru Aprilaire 600 unit. I've had some issues like I haven't heard the air exchanger operating even when the system says it is suposed to be on. Regardless of other issues right now I am running on only the master zone of a 2 zone system. The outlets & most of the returns are blocked in the unfinished additions. The original 900 s/f house is the only area being heated at this time and this is concidered the master zone (zone 2 is disabled). With all controls set for anywhere from 30%-40% humidity the house this winter never went above 20% - 25% @ any outside temp (20 - 50 degrees). I check the humidifier and it was operating whenever the Infinity system requested. I talked to Aprilaire & they said the air temp needs to be 120 degree or better or use a hot water supply. Hot water was not an option. I find the plenum temp @ to be no higher than 100 degrees +/- at any given time (I haven't contacted Carrier about this yet). I did a flow comparison test on the humidifier and it seems to consume 2oz or less in 1.5 minutes, so it is using water. (Although I am troubled by the waste, a different issue). I also did a test by running a vaporizer in the house with an immediate humidity increase. I am @ a loss where to go. Any advice/suggestions will be appreciated.