Effects of incorrect wiring of trane xl16i heat pump


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Old 02-18-12, 07:13 AM
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Effects of incorrect wiring of trane xl16i heat pump

Hi. new member here.

I'd like to determine what the following mis-wiring would have on my system.

I have a visionpro stat, variable speed indoor handler and XL16i heatpump.

The incorrect part of the wiring (per trane manual) is as follows:

Stat Air handler Heatpump
w1----no connection ---- orange wire
w2--------W1------------Black wire
W3 no connection

I'm guessing that it means the heat pump turns on with a call for heat, but the air handler doesn't start up until W2 calls for stage 2 heat?
 
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Old 02-18-12, 09:26 AM
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You are looking at the conventional terminal labels. Refer to the heat pump labels.

The W1 is actually the O/B terminal in your application.



Color codes vary....
 
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Old 02-18-12, 10:58 AM
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Right - so are you saying it is connected properly then?

I was following the labeling in the trane 16i installers guide which shows the "typical field hookup" as W1, W2, etc.

I'm still not certain the 2 stage heating is connected right. I have a 16i with heat strips. I'm assuming that I have 2 stage cooling and 2 stage heat plus Aux, correct?

Thanks!
 
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Old 02-18-12, 01:27 PM
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The O/B terminal is correctly wired at the stat.

The Trane TCON802 is a rebranded honeywell TH8320.
That diagram may help.

The terminal locations do not change but the labels slightly change.


 
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Old 02-18-12, 01:51 PM
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Color codes vary but it is much easier to read a color diagram.
Substitutions are ok if they are made at both ends of the wire.

 
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Old 02-19-12, 04:07 AM
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Thank you very much!

Can you help me understand the interaction between Aux and E and the electric heat strip function?

Which one turns on the strips? Is the black wire going to the HP giving the HP the ability to turn on the strips during a defrost cycle?

On my stat, E and Aux are jumpered together.
 
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Old 02-19-12, 07:02 AM
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E is to control the strips only (no HP use) with emergency heat
Aux is used to turn on strips with HP during normal heating
Yes, black wire to HP is to temper the air during defrost by turning on the strip heaters (defrost is essentially cooling mode)
 
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Old 02-19-12, 07:16 AM
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The 16i was commonly incorrectly wired in the past.

Stat Y was wired air handler Y/Lo, and stat Y2 was wired to air handler Y. This delivered 50% airflow in low speed instead of the 2/3 airflow (of high speed) that is required.

You might verify that stat Y = air handler Y and stat Y2 = air handler Bk and a jumper is placed between O and R as shown in the outdoor unit diagram and this thermostat diagram.
 
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Old 02-19-12, 07:29 AM
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Houston is correct. The 16i was very commonly miswired. The installation instructions wiring is clear, however, most did not read the installers guide and figured they already new how to wire it.
 
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Old 02-19-12, 07:49 AM
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The factory jumper between R and Bk should also have been removed at the air handler for this application.
 
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Old 02-22-12, 06:23 AM
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Thanks everyone for the help. I fixed the wiring to match the diagram exactly.

The only question I have remaining is how would I know for sure if I have an ODT-A or ODT-B at the heat pump?
 
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Old 02-22-12, 07:00 AM
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http://dar.proflo.com/darmanager/Que...E=INSTALLATION

It would be field installed.



Another brands example..

 
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Old 02-22-12, 02:24 PM
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Thanks!! There is certainly no unit like that installed. I set my visionpro to use the outdoor temp sensor and set 35F for HP lockout and 50 for Strips lock out. Should work well.

This site has been great, I really appreciate the help.

I recently added a relay so my vision IAQ stat can control my broan HRV and also added a timer relay so that humidifier solenoid shuts off temporarily (20 sec on, 20 sec off) like the new Trueease humidifiers do. Very easy upgrade and saves tons of water.

Cheers!
 
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Old 02-22-12, 07:45 PM
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35˚ is pretty warm to shut off the HP. and most of all, you are not saving any money doing this on electric heat back up system. let the HP run to heat the home, than having all heat strips doing it.
 
 

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