AC and Heating Repair for the masses

I just want to share with my readers a few posts from popular Do It Yourself websites and forums where people today are finding the information they need to help themselves make great decisions and tackle some of todays challenging Homeowner issues.

Help with wiring HE220A and Carrier 58STA/STX
I've been reading over this forum for the past few days, and there is a lot of great stuff here! Keep up the great work!I am planning on installing an HE220A this weekend. Based on what I've read from the forum, I plan on installing it on the cold air return with the bypass on the hot air supply, and am planning on running hot water to the humidifier. I was wondering, though, if I could get some help with wiring it to my furnace so the humidifier only comes on when the furnace blower is on and the humidistat says humidity is needed. I originally bought the installation kit, but am hoping I can return that since I shouldn't need the sail switch if I wire it to the furnace.Can you help me figure out the wiring? I have a Carrier 58STA/STX furnace. Also, will I need the transformer that came with the humidifier if I wire it to the furnace? Thanks for all your help!


mike n

Member

Join Date: Jan 2008
Posts: 18
Humidity control
You can energize your water coil by running a control wire from your call for heat through your normally open call for humidification if you just use the sail switch or a fan control circuit you run the risk of putting moisture in a cold airstream and creating humidity problem
How To Repair Airconditioners.


knottshawk

Member

Join Date: Dec 2007
Posts: 1
What size duct?
I have a home with an existing Trane xe80 furnace. My back 2 bedrooms have virtually no air pressure AND they blow barely warm air. I was going to replace the ductwork with insulated ducting and make it larger so that it actually blows air back there, but I'm not sure what size ducting to use.The furnace is about 40 feet away from the registers and on the same level. Any advice would be great!


mike n

Member

Join Date: Jan 2008
Posts: 18
Air Duct Dilemma
With a rough sketch or numeric description of your existing ductwork and a model number of your furnace most of these guys would probably be able to give you some very helpful suggestions, while you are looking at the ductwork take some tape with you (some screws and a cordless drill would also be helpful) patch any holes you can find look for dampers that might be closed where your branch lines take off from the main trunk or plenum box put the fan switch an your thermostat to on instead of auto and if you feel comfortable you can shut off the power to the furnace and check fan speed, several wires from your indoor fan will be plugged into a pc board one for nuetral one for high speed and depending on your model one for medium or medium high and medium low and low the one that is controlling your fan speed in low will be plugged onto a terminal that says heat one or two others will be plugged onto terminals saying park these are currently not being used and one will be on a terminal saying cool.Say your heat terminal has the low speed wire on it you can take the medium or medium high wire off of park and fasten it to the heat terminal and take the wire you just removed and put it on the open park terminal this will increase your air volume but also decrease your supply air temperature in heating so you need to be a little careful.The best thing to do is thoroughly evaluate your ductwork, system capacity and the load requirements of your environment all my other suggestions are just band aid adjustments with not enough information.I hope that helps
How To Repair Airconditioners