Lyric T5 wiring help

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  #1  
Old 06-19-19, 09:33 PM
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Lyric T5 wiring help

Trying to hook up a Lyric T5+ thermostat for a dual stage heat pump. My old thermostat wiring which has 10 wires (2 are for sensors that I know I won't need).
On the left side on the outer "Heat Pump" arrows:
Y2-black wire
X2-brown wire
W1-white wire
S1-red wire
S2-white wire
On the right side under outer "Heat Pump" arrows:
RC-red wire
O-Orange wire
Y-Yellow wire
G-Green wire
B-Blue wire

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Last edited by PJmax; 06-20-19 at 02:28 AM. Reason: reoriented/resized picture
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Old 06-20-19, 03:04 AM
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Welcome to the forums.

You have and will be following the 3H/2C heat pump with backup heat diagram.

Y2-black wire -------------> Y2
X2-brown wire - tape off - not needed
W1-white wire ------------> AUX
S1-red wire - tape off - not needed
S2-white wire - tape off - not needed
RC-red wire ----------------> R with the R switch up
O-Orange wire -------------> O/B
Y-Yellow wire ---------------> Y1
G-Green wire ---------------> G
B-Blue wire -----------------> C

Mandatory option settings
option 200 - heat pump
option 205 - heat pump / air to air
option 218 - O/B on cooling
option 220 - 2 cooling stages
option 221 - heat stages 2 and AUX/E stages 1
 
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Old 06-20-19, 06:10 AM
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Without the X2 wire, will I not have the auxiliary or emergency heat?
 
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Old 06-20-19, 01:58 PM
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W1 white and X2 brown are typically the same function and connect together at the air handler.
Your stat will access the E heat via the AUX/E terminal.
 
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Old 06-20-19, 02:32 PM
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Worked like a charm. Thank you for sharing your expertise, I really appreciate it.
 
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Old 06-20-19, 02:35 PM
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Your are very welcome.............
 
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Old 08-27-19, 05:45 PM
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Hey Pete,

I'm having my evaporator coil replaced and the heating and air guys aren't familiar with American Standard and are trying to get the wiring schematics to line up. They are having a hard time with my X2(brown wire) being taped off. They said they don't think I will have heat. You mentioned above that the W1 white and X2 brown are typically the same function and together at the air handler. Any recommendations to help this guy out?
 
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Old 08-27-19, 08:15 PM
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Replacing just the coil or the entire air handler ?

Most air handlers with back up electric heat only require one wire to activate the heat. In your case that would be the W1 white wire. It would be helpful to know what they are installing.

Are they looking for a second electric heating wire ?
There are several T5 models and I usually use the Honeywell full model number for diagrams. If your stat has an E terminal.... they can use that on the brown wire.
 
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