Neutral wire for line voltage stat

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Old 12-08-16, 08:17 PM
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Neutral wire for line voltage stat

I am changing an old Honeywell t4309 to a hotel tech lt120a but cannot figure out the neutral wire. Both have 6 whites and are wired as follows:
Honeywell (was installed)
Red-load cool
Brown-load heat
Blue-fan lo
Tan-fan med
Yellow-fan hi
Orange-hot line

Hotel tech (swapping in)
Black-line
White-neutral
Red-heat
Blue-cool
Yellow-low fan
Orange-high fan

I cannot figure out the neutral wire
 
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Old 12-09-16, 07:05 AM
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The Hotel tech unit requires a neutral connection and the Honeywell didn't. This is probably to power the display and internal circuitry.

If there's no neutral wire in the box you will either have to rewire or look for a line voltage thermostat that doesn't require a neutral.
 
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Old 12-09-16, 07:54 AM
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You may be able to convert the spare wire to neutral but you'd need a wiring diagram for the FCU.
 
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Old 12-09-16, 10:54 AM
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Wink Diagram

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I think I found the diagram on the unit if that helps
 
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Old 12-09-16, 11:10 AM
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That helps tremendously but it's unreadable. Take two pictures...... closeup.
One of the controls section like below and one of the thermostat.

The N is neutral and I've traced it in white. There is a setscrew for white on the terminal strip. The red circle is the connecting terminal strip. You could probably move the tan to neutral.

if you do.... you MUST make and leave a notation near the control board for future service.

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Old 12-09-16, 12:38 PM
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Hope these are clearer
 
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Old 12-09-16, 12:41 PM
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Let me know if you need any other pictures
 
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Old 12-09-16, 12:47 PM
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More pics

Here's the wiriName:  1481316369885-695586090.jpg
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Old 12-09-16, 01:41 PM
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Worked

Thanks for the help I really appreciate it! I really wanted to put in a nest but it cannot handle 120v
 
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Old 12-09-16, 02:46 PM
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You could put a nest in but every function needs to be controlled with a 120v/24v relay.
 
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Old 12-09-16, 04:10 PM
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Pete would I just put a relay on all 6 wires? In order to wire in a nest?
 
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Old 12-09-16, 04:19 PM
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What relay would you suggest and what wires would go where?
 
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