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Need help wiring from old Baystat 239a to Trane(Honeywell) NP Digital TH5320Uxxx

Need help wiring from old Baystat 239a to Trane(Honeywell) NP Digital TH5320Uxxx

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  #1  
Old 01-28-17, 10:06 PM
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Need help wiring from old Baystat 239a to Trane(Honeywell) NP Digital TH5320Uxxx

Have a question I hope you can help with.

I need verification and help specifically with Black Wire for Emergency Heat and Y2 terminal connection the new Thermostats.

I'll give you everything I have regarding info. Better to have too much, than too little. I found someone elses images of their old thermostats which are identical in look and wiring to ours and am using them as well as pics of the new thermostats.

I just bought two Trane 3H/2C/HP capable Digital thermostats off of eBay to replace my old mechanical Weathertron Thermostats (Baystat239A).

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These two new ones are Trane TH5320U1019-(BAYSTAT055A). Replaces THT02550 - 3H (Gas, Oil, or Elec) / 2C / HP
They are Trane's version of the (Honeywell FocusPro TH5320U1001 NP Digital Thermostat for 3H/2C systems.)

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Both of our units are Electric and 3 Heat stages with separate AUX and Emergency Heat, and outside Heat Pumps.
Not sure on the Cooling stages 1C or 2C.

____________________________________________________________

Equipment we have:

Upstairs:
Trane/AS Twh018b140a1 VUp/HLeft Air Handler
Trane Twr018c100a2 Heat Pump - XE 1000 - 1.5 Ton

Dowstairs (Main Level):
Trane/AS Twg025a140a VUp/HLeft Air Handler
Trane Twr024c100a2 Heat Pump - XE 1000 - 2 Ton

Each set of Air Handler and Heat Pump also has their own Baystat239A wired exactly the same.

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Baystat239A Thermostats are both wired:
____________________________________________________________

Terminal Wire Color Purpose
____________________________________________________________
X2 - Black - Emergency Heat
O - Orange - Cool (Change Over)
G - Green - Fan
Y - Yellow - Compressor
T - Tan (Brown) - Thermistor (Outside)
R - Red - 24 VAC Hot
W - White - Aux Heat
U - No Conn. - Jumped to W below terminals
F - No Conn.
B - Blue - 24VAC Common
____________________________________________________________


Terminals on the new thermostats:
____________________________________________________________

L - Y2 - Aux/E - G - O/B - C - Y - R - Rc

From the manual:

Heat Pump Terminals:

Rc - 24VAC power from cooling transformer
R - 24VAC power from heating transformer
O/B - Changeover valve
Y - Compressor contactor
Y2 - Compressor contactor (stage 2) -TH5320U only
G - Fan relay
Aux/E - Auxiliary/Emergency heat relay
L - Sends output when set to Em. Heat
C - 24VAC common
____________________________________________________________

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I know that Red goes to both R and Rc (being jumpered) as there is only one single 24VAC source.

And that Blue goes to C for common to power the Thermostat (and Batteries are used for Stat Memory).

Orange to O/B
Yellow to Y
Green to G
White to W for AUX heat

I've heard Tan is unused and should be taped off behind the new Thermostats.

I am uncertain on:

Black to L for Emergency Heat (Originally X2 on the old 239a's)
and
Y2 on the new Thermostat. I'm not certain we have a stage 2 for cooling. Should it be left unconnected?

Also that I have to set the Thermostats for the correct mode for our equipment before installing them, according to the manual it is mode 10 as it is the only option that covers 3H/2C (even though I think I only have 1C).

Notes for mode 10 are:
____________________________________________________________
[1] Power supply. Provide disconnect means and overload protection as required.
[3] Optional 24VAC common connection.
[7] In Installer Setup, set changeover valve to O or B.
[10] In Installer Setup, set system type to 3Heat/2Cool Heat Pump.
[11] L terminal sends a continuous output when thermostat is set to Em. Heat. Connect to Honeywell zoning panels to switch the

panel to Emergency Heat.
____________________________________________________________


So... Assumed wiring for new Thermostats is:

Terminal - Wire Color - Purpose
____________________________________________________________
L - Black - Output (Emergency Heat)
Y2 - - Compressor (Stage 2)
Aux/E - White - Auxillary/Emergency Heat *
G - Green - Fan/Blower
O/B - Orange - Changeover Valve
C - Blue - 24VAC Common
Y - Yellow - Compressor
R - \_ Red - 24VAC from Heating Xformer
Rc - / Red) - 24VAC from Cooling Xformer

Tan (Thermistor) is taped off.
*Aux and E terminals combined on TH5320U only.
____________________________________________________________



- or as an Old to New routing
____________________________________________________________

BS239A Color -> TH5320U Purpose
____________________________________________________________
X2 - Black - L - Emergency Heat
O - Orange - O/B - Cool (Change Over)
G - Green - G - Fan
Y - Yellow - Y - Compressor
T - Tan (Brown) - Thermistor (Outside)
R - Red - R/Rc - 24 VAC Hot (Jumpered)
W - White - W - Aux Heat
U - n.c. - Jumped to W on 239a
F - n.c. - ?
B - Blue - C - 24VAC Common

Y2 - ?
____________________________________________________________


Look forward to any help.

PS> It'd be nice if tabs worked in your forums. Was pretty until I posted this.
 

Last edited by LWJackn; 01-28-17 at 10:22 PM.
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  #2  
Old 01-29-17, 12:14 AM
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Nothing connects to the new Y2 ( 2nd stage compressor) or the new L ( light).

You can land black with white (possibly energizing more strips) or tape off black .
 
  #3  
Old 01-29-17, 02:00 PM
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Ah okay!

Thank you for the reply!

So to review before I try this...

No Y2
No L

Tan (Thermistor) is taped off

Green - G
Orange - O/B
Blue - C
Yellow - Y
Red - R & Rc (Jumpered)

White to Aux/E

Black and White possibly jumpered together or Black (Em Heat Strip) taped off.

I have heard that with the old Thermostats when in Emergency Heat mode that they lock out the Compressor/HP. Would there be any possible conflict in tying White and Black together?

We have never used Emergency Heat mode in the time we have had the place.
I wonder if I should just tape the Black instead. Will try it with White only first.

I have one other question if you wouldn't mind. Installer setup PDF has a note to set changeover to O or B for the O/B terminal on the new Thermostat.

[7] In Installer Setup, set changeover valve to O or B.

Since the old Thermostat uses Orange on the O terminal, that should be set to O then in the setup of the new Thermostat?


Thanks again so much for your reply!
 
  #4  
Old 01-29-17, 03:37 PM
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Correct, the O/B terminal should be configure for O ( energize heat pump reversing valve for cool mode).
 
  #5  
Old 01-29-17, 04:25 PM
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Awesome Thank you!

Now hopefully I can return the favor to someone here on these forums.

Cheers!
 
  #6  
Old 01-30-17, 09:22 AM
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A few questions for the setup on the new Thermostats if you wouldn't mind.

(I'll add the section on this in a quote below for reference)
___

Install Option Settings

Item 1 set to option 10 for 3H/2C (even though it is only 1 C and Y2 not connected there is no mode option for 3H/1C)

Item 2 set to option 0 Changeover valve (O/B terminal energized in cooling)

The following are my questions...
___

Q1 -Is a Trane Air handler considered an Electric furnace or Leave it zero?

Item 3 Fan control (heating)
- Default is set to 0

- 0 Gas or oil furnace — equipment controls fan in heating
- 1 Electric furnace — thermostat controls fan in heating
___

Q2 - Same question about the Air Handler on these next 3, they all default to 5, should they be 9 for Electric Furnace?

Item 5 - Stage 1 heat cycle rate (CPH: cycles/hour)
Item 6 - Stage 2 heat cycle rate/Auxiliary heat cycle rate (CPH)
Item 7 - Auxiliary heat cycle rate (CPH) - Only TH5320U for 3H/2C Heat Pumps
- Default is set to 5

- 1 For steam or gravity systems
- 3 For hot water systems & furnaces of over 90% efficiency
- 5 For gas or oil furnaces of less than 90% efficiency
- 9 For electric furnaces

[Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]
___

Q3 - Is this the changeover for the HP valve and should I leave it on manual? (similar question to #1 I guess, where the equipment handles it or the Thermostat handles it?)

Item 12 in setup Manual/Auto Changeover
- Default is set to 0

0 - Manual Changeover (HEAT/COOL/OFF)
1 - Auto Changeover (HEAT/COOL/AUTO/OFF)
2 - Auto Changeover Only (AUTO)
___

Q4 - I found a flowchart on identifying your system and wiring guide for another Trane Thermostat (which I will attach with this reply as it might help someone else) that shows connecting both white and black (W and X2 / Aux and Em Heat) to W1 which equates to my Aux/E on my thermostat.

I also noticed that the "L" Output is 20-30 Vac 0.02-0.5 A.

Keeping within these voltages and using a very low amperage indicator lamp or something to show when Em Heat is on, would I use C as a "common/return" for the L?

I liked seeing the Blue "Heat" light on the old Thermostats, so I was thinking of rigging up a Blue LED driver circuit that would take the 20-30 VAC and rectify and regulate a lower voltage for the LED.

You think that would be risky?


Once again I appreciate your help very much!



Setup function Settings & options (factory default listed first)

Shaded areas below apply only to TH5320U/TH5220D or as otherwise noted.
________________________________________________________________
1 System type

- 0 1 heat/1 cool conventional

- 1 1 heat/1 cool heat pump (no aux. heat)
- 2 Heat only — 2-wire systems, 3-wire zone valves (Series 20), and normally open zone valves
- 3 Heat only with fan
- 4 Cool only
- 5 2 heat/1 cool heat pump (with aux. heat)
- 6 2 heat/2 cool conventional
- 7 2 heat/1 cool conventional
- 8 1 heat/2 cool conventional
- 9 2 heat/2 cool heat pump (no aux. heat) - TH5320U only
- 10 3 heat/2 cool heat pump (with aux. heat) - TH5320U only
________________________________________________________________
2 Changeover valve (O/B terminal)

- 0 Changeover valve (O/B terminal energized in cooling)

- 1 Changeover valve (O/B terminal energized in heating)
________________________________________________________________
3 Fan control (heating)

- 0 Gas or oil furnace — equipment controls fan in heating

- 1 Electric furnace — thermostat controls fan in heating
________________________________________________________________
5 Stage 1 heat cycle rate (CPH: cycles/hour)

- 5 For gas or oil furnaces of less than 90% efficiency

- 1 For steam or gravity systems
- 3 For hot water systems & furnaces of over 90% efficiency
- 9 For electric furnaces

[Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]
________________________________________________________________
6 Stage 2 heat cycle rate/Auxiliary heat cycle rate (CPH)

- 5 For gas or oil furnaces of less than 90% efficiency

- 1 For steam or gravity systems
- 3 For hot water systems & furnaces of over 90% efficiency
- 9 For electric furnaces

[Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]
________________________________________________________________
7 Auxiliary heat cycle rate (CPH) - Only TH5320U for 3H/2C Heat Pumps

- 5 For gas or oil furnaces of less than 90% efficiency

- 1 For steam or gravity systems
- 3 For hot water systems & furnaces of over 90% efficiency
- 9 For electric furnaces

[Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]
________________________________________________________________
9 Stage 1 compressor cycle rate (CPH)

- 3 Recommended for most compressors

[Other cycle rate options: 1, 2, 4, 5 or 6 CPH]
________________________________________________________________
10 Stage 2 compressor cycle rate (CPH)

- 3 Recommended for most compressors

[Other cycle rate options: 1, 2, 4, 5 or 6 CPH]
________________________________________________________________
12 Manual/Auto changeover

- 0 Manual changeover (Heat/Cool/Off)

- 1 Auto changeover (Heat/Cool/Auto/Off)
- 2 Auto changeover only (Auto)
________________________________________________________________
14 Temperature display

- 0 Fahrenheit

- 1 Celsius
________________________________________________________________
15 Compressor protection

- 5 Five-minute compressor off time

[Other options: 0, 1, 2, 3 or 4-minute off time]
________________________________________________________________
26 Auxiliary heat control

- 0 Comfort

- 1 Economy

Auxiliary heat control (Setup Function 26):
• Comfort Setting: The thermostat will prioritize comfort over economy depending on heat
pump performance, load conditions and whether the thermostat is calling for the heat
pump. Raising the temperature just a few degrees will often activate the auxiliary heat.

• Economy Setting: The thermostat will attempt to reach the temperature setting
without activating the auxiliary heat. The thermostat will wait to activate the auxiliary
heat depending on heat pump performance, load conditions and how many degrees the
temperature setting is changed.
________________________________________________________________
27 Heat temperature range stops

- 90 Max. heat temperature setting is 90 F (32 C)

[Other options: 40 F to 89 F (4.5 C to 31.5 C)]
________________________________________________________________
28 Cool temperature range stops

- 50 Min. cool temperature setting is 50 F (10 C)

[Other options: 51 F to 99 F (10.5 C to 37 C)]
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  #7  
Old 01-30-17, 09:56 AM
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Hard to navigate with all this stuff.

Your system type is a 5. Heatpump with backup electric.
Item 3 fan control is 1 for electric.

Item 12 is asking you if you want the system to change from heating to cooling automatically. I prefer no which is 0.
 
  #8  
Old 01-30-17, 01:58 PM
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Hard to navigate with all this stuff.

Your system type is a 5. Heatpump with backup electric.
Item 3 fan control is 1 for electric.

Item 12 is asking you if you want the system to change from heating to cooling automatically. I prefer no which is 0.
Sorry... I always like to be prepared with everything when posting.

Type (5) - 2H/1C?

I assumed Type (10) because we have the Emergency Heat as well as Aux Heat and also the Heat Pumps.

That is not 3H then?

(0) Sounds good for Item 12 and Item 3 is (1) for electric then. Okay.

How about Items 5, 6, & 7 which default to (5) for Gas or Oil Furnace?
Use (9) for Electric Furnace too?


Thanks for the reply and help.
 
  #9  
Old 01-30-17, 03:26 PM
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Aux heat and emergency heat use the same coils.

Aux heat runs with the heatpump when it can't keep up.
Emergency turns off the heatpump and runs electric only.

The other three items are cycles per hour settings. You can set them for electric or somewhere in between.
 
  #10  
Old 01-30-17, 04:33 PM
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Okay thank you PJmax!



That was why I jumped on these particular Thermostats for the 3H/2C capability.

No matter, still an awesome deal.

And thank you both again for the help!
 
  #11  
Old 01-28-19, 07:25 PM
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Location: Canada
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Hi,
I have the model: Q674L1728

What is the T (thermistor outside) in the news models ?
what is the corresponding letter or position for T in the new models?

Thanks
 
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