Neutral wire for line voltage stat
#1
12-08-16, 09:17 PM
Join Date: Mar 2015
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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
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
#2
12-09-16, 08:05 AM
Member
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.
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.
#3
12-09-16, 08:54 AM
Group Moderator
You may be able to convert the spare wire to neutral but you'd need a wiring diagram for the FCU.
Diagram
#5
12-09-16, 12:10 PM
Group Moderator
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.
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.
ng let me know if you need anymorr
#9
12-09-16, 02:41 PM
Join Date: Mar 2015
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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
#10
12-09-16, 03:46 PM
Group Moderator
