Help with replacing a Carrier thermostat with Honeywell WiFi thermostat

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Old 10-16-19, 06:02 PM
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Help with replacing a Carrier thermostat with Honeywell WiFi thermostat

I have a Carrier thermostat that has begun to malfunction. I believe it was installed in 2003. I have a Puron system with two units and one transformer. The heating system is a gas furnace. The first two photos are of the Carrier thermostat with two wiring blocks and the system has two wire harnesses.

The first photo is a picture of the circuit board on the unit associated with the thermostat in question.

The primary harness has all wires used. All but one was hooked up to the top wiring block:

Red - R
Green - G
White - W/W1
Yellow - Y/Y2

The only wore from the primary harness to the other block was the common:

Blue - C

The wires used on the other harness only included red, green, white and yellow:

White - S1
Red - S2
Yellow - DHUM
Green - O/W2 (only wire hooked to the top block.

The Honeywell thermostat has one block and the model is Model # RTH6580WF1001/U1. The block has terminals for K, Y2, W2, G, W, Y, C, R, and RC.

Please share advice on matching the wires to the terminal block, thx.
 

Last edited by PJmax; 10-16-19 at 09:13 PM. Reason: removed dead links
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Old 10-16-19, 06:15 PM
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Welcome to the forums.

Those links you left are the locations of the pictures IN your phone. You need to send them here.
Follow this.................... How-to-insert-pictures.
 
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Old 10-16-19, 08:28 PM
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Photos attached

Photos added as indicated.

Name:  t1.jpg
Views: 32
Size:  27.0 KB

Name:  t3.jpg
Views: 31
Size:  15.7 KB
 

Last edited by PJmax; 10-16-19 at 09:41 PM. Reason: reoriented/enlarged pictures
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Old 10-16-19, 08:32 PM
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Photos uploaded

Missed one of the pix, here’s the last one.
 
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Old 10-16-19, 09:57 PM
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Typical connections would be.....

R - Red -------------------> R/Rc
G - Green ----------------> G
W/W1 - White -----------> W
Y/Ys - Yellow ------------> Y
C - Blue -------------------> C
DHUM gets taped off

I don't know what that green wire is doing on the O terminal.
You don't have a heat pump in addition to the furnace..... do you ?
S1 and S2 are used for an outdoor temperature sensor usually used for heat pump lockout.
The O is used to control a heat pump reversing valve.

If you have a heat pump..... don't make any changes yet.
You have a dual fuel system and I don't think this stat is usable.
You'd need the 9580.
 
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