Replacing Old Lenox Thermostat With New RTHL3550 Honeywell - HVAC - DIY Chatroom Home Improvement Forum


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Old 05-05-2012, 09:12 PM   #1
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replacing old lenox thermostat with new RTHL3550 honeywell


I am having trouble with the proper wire hookup. The fan kicks on but the compressor does not.The Lenox is a mid to late 80"s model and has the rectangular thermostat with wires F, E, Y,R,V, and three unused wires I have no idea what they are for..The old unit is a heat pump /cool/ with emergency back up( strip heat).. Can someone please tell me how to wire this up to my new honeywell RTHL3550..Thanks amillion

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Old 05-06-2012, 10:59 AM   #2
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replacing old lenox thermostat with new RTHL3550 honeywell


Does this help?

http://www.google.com/imgres?imgurl=...BMAk&dur=12838

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Old 05-06-2012, 11:41 AM   #3
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replacing old lenox thermostat with new RTHL3550 honeywell


Why put a new thermostat on a 25 year old heatpump?

Are you having other problems with it?
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