Need help on replacing Trane thermostat


  #1  
Old 02-28-11, 12:08 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
Need help on replacing Trane thermostat

Greetings,

I have a Trane XL13i 2.5 ton all-electric heat pump system with variable speed air handler and 10KW heater (model 4TWX3030A1000AB and 4TEE3F31A1000AA). I am replacing my non-programmable Trane thermostat (model TAYSTAT570) with a Trane XL803 programmable thermostat (model TCONT803AS32DA) with dehumidification control. I do not have the optional outdoor temperature sensor or remote temperature sensor. Looking for wiring and installer setup tips. Thanks much.
 
  #2  
Old 02-28-11, 01:34 PM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,244
Received 2 Votes on 2 Posts
Using set back with a HP is NOT recommended, it will cost you more to use set back than it will to keep constant temp.

Are you going to be using the dehumidification function of the stat?
If so I don't believe that this stat will do what you want...........
I do not see a wiring diagram for a 2H1C application with variable speed air handler for dehumidificaton. Better off with the honeywell IAQ version to get all functions.
 

Last edited by hvactechfw; 02-28-11 at 05:09 PM.
  #3  
Old 02-28-11, 02:12 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
I live in northwest Florida panhandle where temps are moderate in summer and winter due to proximity of the Gulf of Mexico. Plus my home is very well insulated. People I know have seen cost savings with a programmable thermostat and more indoor comfort with the dehumidification feature. I contacted Trane and they recommended the 803 thermostat for my system. Can you provide any tips on DIP switch settings, wiring and/or installer setup config? TIA.
 
  #4  
Old 02-28-11, 02:28 PM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,244
Received 2 Votes on 2 Posts
AH install manual
dip switch settings
1-ON
2-OFF
3-OFF
4-OFF
5-ON
6-ON
7-ON
8-OFF
Stat install manual
From this you will find there is no recommended setup for 2H1C with dehumdification as this stat uses 1st stage cooling for dehumidification. I know you can set what you want up with the Honeywell IAQ. We will wait for the other Moderator JAY11J to chime in, he should be on a little later.
 

Last edited by hvactechfw; 02-28-11 at 05:08 PM.
  #5  
Old 02-28-11, 07:42 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
Wouldn't a 3H2C configuration work? My Trane XL13i heat pump includes a 2-step compressor matched to a variable speed air handler and 10KW heater. When the heat pump was originally installed, I selected the Trane non-programmable thermostat TAYSTAT570 to save $$ not realizing this particular thermostat wouldn't take advantage of the XL13i efficiencies since it is normally matched to a 2H1C system. Higher electric rates has prompted me to look at a programmable thermostat for potential savings.
 
  #6  
Old 02-28-11, 08:22 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
Correction to last post: heat pump includes compressor with 2-speed fan matched to a variable speed air handler and 10KW heater.
 
  #7  
Old 03-01-11, 03:55 AM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,244
Received 2 Votes on 2 Posts
your AH only utilizes 1 stage of heating. The other stage is HP. The HP 2-speed fan is controlled by outdoor temp, a different thermostat will not give you any control over this.
 
  #8  
Old 03-01-11, 04:58 AM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
I understand now. Thanks for explaining. I'll need to wire the 803 thermostat for a 2H1C system using figure 9 in the stat manual and enter 7 in the installer setup for number 0170. So in order to utilize the humidity sensor in this thermostat, I'll need to install the optional outdoor temp sensor which is what you inferred earlier. Trane didn't tell me that. I would have bought the 802 stat instead. Can you provide the recommended the installer setup selections for numbers 220, 250, 270, 310, 580, 650, 660, 680, and 690?
 
  #9  
Old 03-01-11, 05:18 PM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,244
Received 2 Votes on 2 Posts
NO, I'm trying to tell you that this stat will not provide the best type of dehumdification with a 2H1C with variable speed AH setup like yours. It is meant to provide dehumidification using a 2 stage AC or HP to achieve the better dehumidification. You have a 1 stage HP. The outdoor sensors you talked about do you no good for dehumdification and are not necessary for your setup.

Using this stat will provide extra dehumdification, but you will not be getting the full benefits of the way it should be done. That correct way is by lowering the blower speed to make the indoor coil colder and remove more humidity faster while running in this mode a determinable/settable number of degrees below the setpoint. This thermostat provides dehumdification only by running the A/C an extra length of time and a nonsettable 3F delow setpoint.

Dehumidification Droop Control
The dehumidification control attempts to control to the
userís humidity setpoint by turning on the air conditioner.
In extremely high humidity conditions, the comfort control
keeps the air conditioner running for up to 3įF below the
temperature setpoint. It does this while trying to achieve
the desired humidity setpoint and balancing that with the
temperature setpoint.
 
  #10  
Old 03-01-11, 05:24 PM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,244
Received 2 Votes on 2 Posts
Originally Posted by romy21 View Post
Can you provide the recommended the installer setup selections for numbers 220, 250, 270, 310, 580, 650, 660, 680, and 690?
220 - 3
250 - 3
270 - 3
310 - 3 I do not recommend Automatic Changeover. It tends to get homeowners confused as it automatically can change the setpoint of the opposite setting of what you are setting.
580 - 5
650 - 0
660 - 0
680 - 2
690 - 2
 
  #11  
Old 03-01-11, 06:11 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
Thanks for all your help. I plan to install the new thermostat tomorrow. Will let you know how it goes.
 
  #12  
Old 03-06-11, 12:53 PM
R
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 7
Received 0 Votes on 0 Posts
New thermostat install went very smoothly and it's working fine. I did not change any of the air handler ICM fan control dip switch settings which were set to 1-on, 2-off, 3-off, 4-off, 5-on, 6-on, 7-on, 8-on. Appreciate all the help.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: