2 Stage AC???

Reply

  #1  
Old 12-04-13, 10:36 PM
Member
Thread Starter
Join Date: Dec 2013
Posts: 3
2 Stage AC???

Recently, I had a repair guy replace the gas valve on my Trane 2 stage, variable speed furnace. While he was there, he checked the wiring at the thermostat and said that the AC side was wired "funny". While he did not change the AC wiring, he did fix the original problem (bad gas valve), so I'm happy to have heat again (just in time!).

However, that got me wondering if system is wired correctly for the installed equipment. I remember that the original installer fired the technician in the middle of the job and found a new guy. Below is my setup.

Equipment:
Thermostat: Trane XT 302C
This stat may be programmed for 1 or 2 stage heating, 1 or 2 stage cooling, or heat pump.
==> It IS programmed for 2 stage heat and 1 stage cooling.

Furnace: Train XV 80 (Variable Speed, 2-Stage Gas Furnace)
Model: TUD080R9V34H6

Coils: Trane, Model: TXC036S3HPC0

Condenser: Trane XL 1400, Model: TTY036B100A0

Wiring (AC side)
At the Thermostat terminals:
Y1 - Yellow wire
Y2 - Jumpered to Y1
Orange wire present but is NOT connected to anything

At the Furnace controller terminals:
Y1 - Yellow wire from Stat
Y1 - Yellow wire from Condenser
Y2 - Orange wire from Stat (note that it is NOT connected at the stat)
Y2 - Orange wire from condenser

At the outdoor Condenser:
I did not check these wires

Questions
1) Do I have a 2 stage AC system or a single stage AC system?

2) If its a 2 stage AC, will I find a Y1 & Y2 terminal on the outdoor condenser?

3) If its a 2 stage, should I:
A) Removed the jumper at the stat
B) Connect the Y1 terminals on all equipment together
C) Connect the Y2 terminals on all equipment together
D) Program the stat for 2 stage cooling

4) If its a single stage cooling system, what is the correct wiring at the stat, furnace controller and condenser?

Thanks for any help with these questions!
 
Sponsored Links
  #2  
Old 12-05-13, 03:54 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,325
Likes Received: 1



It is a single stage cooling 2 stage heat system.
YLo should not be in use. This diagram should help repair the wiring for your setup.
 
  #3  
Old 12-05-13, 04:17 PM
Member
Thread Starter
Join Date: Dec 2013
Posts: 3
THANKS!! That helps a lot.

With the stat programed for 1 stage heat, I should :

A) remove the jumper between Y1 and Y2 at the stat
B) connect the Y2 at the stat to the Y on the furnace controller
C) connect the Y on the furnace controller to the Y outdoor condenser
D) disconnect wire on Y1 at the stat and Ylo at the furnace controller

Is that correct?


Last, could you post the settings for the DIP switches?
With the way the installer miss-wired the system, I would like to confirm these setting also.

The board where the screw terminals and DIP switches is labeled "American Standard 21C148501P01".

The above board is connected via pins to the the furnace controller which is marked "White Rodgers 50A51-507"
 
  #4  
Old 12-05-13, 04:43 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,325
Likes Received: 1
I think you meant with the stat programmed for 1 cool and 2 heat.
B is incorrect. Connect stat Y1 to furnace Y.
You will not use stat Y2 or furnace YLo.

1 = on
2 = off
3 = off
4 = off
5 = on
6 = on
7 = on
8 = off
 
  #5  
Old 12-05-13, 05:51 PM
Member
Thread Starter
Join Date: Dec 2013
Posts: 3
Go it.

Houston204, THANK YOU for your help.
 
  #6  
Old 12-06-13, 03:33 PM
user 10's Avatar
Member
Join Date: Mar 2004
Location: NA
Posts: 1,834
Likes Received: 6
Are you sure you have a 2-stage a/c? Did you open the outdoor unit to check?

I looked up the name and found a brochure - there was no mention of two stage there.
 
  #7  
Old 12-06-13, 07:01 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,325
Likes Received: 1
It is not a 2 stage cooling unit. The OP already knows this Muggle.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes