Thermostat installation issue


Old 01-23-13, 03:28 PM
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Thermostat installation issue

I'm attempting to change out my thermostat, and have a question. The current wiring wasn't done correctly. It is only wired for 1 heat and 1 air. This system is a 2 heat, 1 air system. Background info: I have a Carrier 38YCC024 system (Heat pump?).

I purchased a Honeywell TH6220D series thermostat.

My thermostat has 6 wires. I am thinking they are assigned in the following manner:

G - Green - A/C fan
W - White - 1st stage heating
Y - Yellow - 1st stage cooling
C - Blue - 2nd stage cooling
Rc - Red - 24v power
O - Orange - Heating Pump/Reversing Valve

The Thermostat has the following label:

Heat Pump System - L - Aux/E - G - O/B - C - Y - R - Rc
Conventional System - Y2 - W2 - G - W - C - Y - R - Rc

I believe it is a heat pump system based on research. I have the green (G), yellow (Y), red (Rc), and blue (C) wires figured out. But which ones are the white and orange assigned to? Any help would be greatly appreciated. Hopefully this is detailed enough for you all. Thanks!!

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Old 01-23-13, 04:30 PM
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White = Aux/E
Orange = O/B

Function 1 = 5
2 = 0
3 = 1 (if it appears)
6 = 3
8 = 3


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