I have the HVAC Hook Up!

[Dadsguns]

What a monster this thing is. These guys have completed the install and were nothing short of professional and courteous, very clean install.  I really didn't realize it would take them from 0830-1730.  Runs very quiet, I can hear my neighbors new goodman running over my trane.  Lets see who breaks down first. 

[Meatwad]

Heres one.

American Standard (Trane) comfort 80 single stage

High limit trips a lot. Currently blower speed for AC is on highest and heat on second highest jumper. House is 1300 SqF. Where can I find a data plate to see if the furnace and/or blower fan could be too small. Airflow out of vents is a lot less then what I have seen before in other houses.

[RichardDickBong]

Glad to hear everything went well Dadsguns.

Do you have the model number on your furnace Meatwad? Do you know if any of the parts have been replaced since install?

[RichardDickBong]

Yeah it's all day ordeal. Sometime my crews take two days.. 

[Meatwad]

No model number to speak of due to a data tag that is nowhere to be found. There is no paperwork or invoices on the furnace at all to show of any work done to it since the previous owners of the house did not keep any paperwork

[RichardDickBong]

There might be a panel on the furnace that you can remove by taking out a screw or two. You will more than likely find the model number inside this panel. If you can get the model numbers from the coil and or outside unit also.

[TequilaChaser]

Heres one.

American Standard (Trane) comfort 80 single stage

High limit trips a lot. Currently blower speed for AC is on highest and heat on second highest jumper. House is 1300 SqF. Where can I find a data plate to see if the furnace and/or blower fan could be too small. Airflow out of vents is a lot less then what I have seen before in other houses.

Data Plate will be on the left inside of the top compartment / gas burner chamber ( if unit is horizontal, imagine it standing vertical )

High Limit tripping out could be a number of issues causing it:

-bad Limit switch or intermitent switch problem

-Dirty / clogged up Evaporator Coil

- Duct Liner inside the duct work as come loose on the Supply or maybe even Return Air Plenums and is killing the airflow

- Dirty Blower Wheel / Squirrel Cage

- Dirty / clogged Filter

- Fan Motor going bad / not working to full capacity

- might try switching the AC Fan setting to Med-High and putting the Heat Fan setting to High ( switch the jumpers or wire connectors..... )



or does this have a variable speed motor??? are the dip-switches set incorrectly??  need that Model No. and Year manf. and Serial No.

just a few things that could be causing it to trip on High Limit.......

also, someone could have installed the wrong orfices ( gas nozzles ). is it natural gas or propane gas?  if Propane then it should have a LP Nozzle Kit specifically installed for Propane......

edit: also an Undersized Return and/or Supply will have a choking effect on the airflow...... the Duct Work could be improperly sized. this in return will not allow the Gas Furnace Blower to move enough air across the heat exchanger, causing the High limit to trip, because of Air Flow being restrictive....

hope this helps

TC

[Meatwad]

Natural gas.

Checked and limit switch was bad, new one ordered

[FireDrgn]

How did u check the limit switch.?   Typically that is the symptom. Not the cause.  Especially since you said you have low air flow from the vents.    I would check the evaporator coil to be sure it's not partially plugged. (if u have one). If not check for motor speed or dirty filter.

[Meatwad]

Limit switch rated at 145, kicks out at 135

About the furnace.....Come to find out the previous owners had it installed and its too small for the size of house we have. A-coil clean and blower fan unobstructed