Replacing old thermostat with a Honeywell RTH6580wf


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Old 01-23-23, 08:57 PM
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Replacing old thermostat with a Honeywell RTH6580wf

I'm replacing my old Chasrobert Honeywell thermostat (no model number) with a rth6580wf Honeywell thermostat. The problem i'm running into is how to wire the new thermostat.

Old thermostat wiring.


New thermostat.

 

Last edited by PJmax; 01-23-23 at 09:19 PM. Reason: resized/enhanced pics
  #2  
Old 01-24-23, 08:37 PM
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Many of the older Honeywell thermostats required a jumper between W1 and Y1 to energize compressor for heat or cooling. Looks like what you have.

new stat - color wire
G - green (with label )
C - Blue
R - red
Y - yellow
Aux/E - green
O/B - white

You must also configure the new stat for heat pump operation.
Hold down the Fan and up triangle buttons for 3 seconds to enter configuration mode.

Set Function 1 to option 5 Heat pump with backup heat.
2 = 0
I always set 12 to option 1 for auto changeover
16 = 1 if you want to program schedule changes


 
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Old 01-23-23, 09:10 PM
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Welcome to the forums.

Another amazing installation and not following accepted and established wiring colors.
Is the system working with that old stat ? The wiring hasn't been changed yet... correct ?

Do you know what your system is ?
Gas furnace with split A/C, heat pump with back up electric ?

I see an O connection means heat pump.
I see two W's which means two stage heating which is strange for a heat pump.
No connection on Y means NO cooling.

Looks like the current wiring is incorrect.
G --------> brown
C --------> blue
R ---------> red
W1 ------> yellow
W2 ------> green
O --------> white
 
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Old 01-24-23, 03:40 AM
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The old picture is the original wiring. It worked for both heating and cooling. There's a jumper between W1 and Y. I believe it is a heat pump with back up electric.
 
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Old 01-24-23, 08:14 PM
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G --------> green
C --------> blue
R ---------> red
W1 ------> yellow with jumper to Y
W2 ------> green
O --------> white
 
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Old 01-24-23, 09:07 PM
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I missed the jumper between W1 and Y.
 
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Old 01-25-23, 04:02 PM
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Thanks, appreciate the help. Seems to be working fine with the new thermostat.
 
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Old 01-25-23, 04:35 PM
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Good job.
 
 

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