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Old 10-20-2012, 04:55 PM   #1
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


I recently bought Honeywell fan coil thermostat TB8575A1000 to replace my older Honeywell thermostat T8575D2003 which is discontinued by Honeywell.I don't know much about HVAC wiring. There are 8 wires coming out from the wall which was connected to my older thermostat

Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-3119960609.jpg
In this manner, By going through the manuals I figure out how to connected 7 wires out of 8 to the new thermostat
Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-2127121804.jpg

There is one more wire which is Violet in color and hooked to connection number 6 in the older thermostat T8575d2003 it's mentioned as Fan Common wire in T8575D2003 literature

I need someone to help me out by looking at the picture if the wiring is connected correctly and help me out where I can attach violet wire.

Thank You.
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-628663973.jpg  

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Old 10-20-2012, 08:33 PM   #2
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


In the pic, the wire on 6 looks to be green. Does your fan coil have 1 or 2 transformers.

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Old 10-20-2012, 08:43 PM   #3
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


From your pics, looks like older ts had 4 wires for fan control/speeds.
New one has only 3. Probably jumpered internally.
Your wiring looks correct. Extra wire not needed.
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Old 10-20-2012, 08:55 PM   #4
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


Yes it's green I have this diagram of the heat system I have in condo. May be this will help

Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-3273037881.jpg



Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-4060285412.jpg



Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-3459975328.jpg



Need help with honeywell TB8575A1000 Fan coil thermostat wiring-image-943878995.jpg



Thanks for replying to my post
Appreciate your help.
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Old 10-20-2012, 09:00 PM   #5
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


Quote:
Originally Posted by diyorpay
From your pics, looks like older ts had 4 wires for fan control/speeds.
New one has only 3. Probably jumpered internally.
Your wiring looks correct. Extra wire not needed.
The new thermostat had Pipe sensor option the last slot does this green wire has anything to do with that ?
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Old 10-20-2012, 09:01 PM   #6
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


Quote:
Originally Posted by beenthere
In the pic, the wire on 6 looks to be green. Does your fan coil have 1 or 2 transformers.
I think it's only one transformer
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Old 10-20-2012, 10:06 PM   #7
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


The wire to 6 was/is energized from the aquastat. If the new stat energizes the fan speeds from the R terminal, then you don't need to connect that violet wire.
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Old 12-09-2012, 05:36 PM   #8
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Need help with honeywell TB8575A1000 Fan coil thermostat wiring


Quote:
Originally Posted by Desihype View Post
I recently bought Honeywell fan coil thermostat TB8575A1000 to replace my older Honeywell thermostat T8575D2003 which is discontinued by Honeywell.I don't know much about HVAC wiring. There are 8 wires coming out from the wall which was connected to my older thermostat

Attachment 59133
In this manner, By going through the manuals I figure out how to connected 7 wires out of 8 to the new thermostat
Attachment 59135

There is one more wire which is Violet in color and hooked to connection number 6 in the older thermostat T8575d2003 it's mentioned as Fan Common wire in T8575D2003 literature

I need someone to help me out by looking at the picture if the wiring is connected correctly and help me out where I can attach violet wire.

Thank You.
I have almost the exact same setup (only difference is the thermostat model) and can't figure out which wire goes into which terminal on the new thermostat - any chance you remember which colour wire matched which label? Need to figure out if the NEST thermostat is compatible.



Last edited by tyassine; 12-09-2012 at 05:44 PM.
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