Fan coil mechanical thermostat to programmable


  #1  
Old 02-15-15, 12:02 AM
J
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Fan coil mechanical thermostat to programmable

Hi,

Specifications
Fan coil unit
IEC FXY
Fan controller 70005905
Dial Thermostat THE70010605
2 pipe hot or cold

I am trying to install a Venstart T1075 (Venstar Fan Coil Series | T1070, T1075) thermostat to my IEC FXY. I am using the Venstar because it has the same specs and looks similar to this controller:

24V Programmable Digital Thermostat | IEC International Environmental

A 24V control is in the IEC FXY as stated in the the following document column H line #3:
http://portal.iec-okc.com/portals/0/...0-90002103.pdf

Could someone please tell me where is the 24VAC line located in the IEC FXY? Or did I just spend 60$ on a thermostat I cannot use The power line coming in is 120V and is wired directly to the fan controller. I've looked all over and traced every line and can find no stepdown for the voltage to the 24VAC line.

Thanks

Wiring diagram:
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  #2  
Old 02-15-15, 07:56 AM
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Welcome to the forums.

Dial Thermostat THE70010605 is a local high voltage mechanical thermostat. It is not 24v and cannot be just replaced with a 24v thermostat.

It is possible to use a remote thermostat but will require some modification and wiring work.
A fan center would need to be installed.

115 Volt 24 Volt 40 VA Fan Center Transformer Relay Controller (Honeywell) | American HVAC Parts
 
  #3  
Old 02-15-15, 11:31 AM
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I suspect that a fan center will not easily fit into the cabinet of this air handler.

The complete model number may reveal that you need a 240 volt transformer in the fan center.

Name:  IEC FXY air handler.jpg
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A multi-voltage fan center may be a better option.
It is tough for some distributors match Amazon's prices.

This White Rodgers 115/208/230 volt 90-130 fan center is about $100 cheaper.

http://www.amazon.com/White-Rodgers-...+center+90-130
 
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Old 02-15-15, 02:47 PM
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Thanks for the suggestions guys!

Since this venstar thermostat is the wrong tool for the job of temperature control in my condo, can ya'll please suggest a solution for keeping my fan coil from cooking or freezing me when I sleep. The stock thermostat stinks and apparently the IEC documentation is unreliable. I realize I could make it work with the transformer and probably some relays, but there is not much room in the box.
 

Last edited by jonsw; 02-15-15 at 03:13 PM.
  #5  
Old 02-15-15, 09:09 PM
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  #6  
Old 02-17-15, 09:39 AM
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Found a new thermostat Honeywell TB6575A1000 but unsure of the power line

Hi Pete,

Thanks for the suggestion, but instead of these manual thermostats i was thinking of installing the following:
Honeywell TB6575A1000 since it seems to fit the bill for line voltage thermostats. I would like to move it out of the cabinet and onto the wall to get better room temperature readings.

Honeywell TB6575A1000 SuitePro Fan Coil Thermostat - Programmable Household Thermostats - Amazon.com

But this is a 120/240VAC, my question is would I use the Yellow L1 line for power even though the diagram indicates this is a 208/240?

Thanks,
Jon
 
  #7  
Old 02-17-15, 10:30 AM
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It looks like that thermostat would work. I need a BIG view of your wiring diagram in your first post. It needs to be hosted elsewhere and linked here. Leave me a link to the diagram or if you can send it to me.... I'll host it.
 
  #8  
Old 02-17-15, 09:56 PM
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IEC FXY wiring diagram

Picture hosted at photobucket. Click on picture and then click on zoom in upper right corner of picture.



Thanks,
Jon
 

Last edited by PJmax; 02-18-15 at 03:46 PM. Reason: added linked picture
  #9  
Old 02-18-15, 04:01 PM
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Jon.... couple of things.

Please post the full FXYxxxxxxxxxxxxxxxxxxxxxxxxx model number as it tells us voltage and type of air handler that unit is.

Trying to figure out if you have a two pipe or four pipe system.
 
  #10  
Old 02-20-15, 08:24 AM
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Hi Pete,

All I found was the following:
FXY0300119268
Also I know it is a 2 pipe cause we have a seasonal changeover.

Thanks,
Jon
 

Last edited by jonsw; 02-20-15 at 09:53 AM.
 

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