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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22001
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have an old Lennox 28g9801 and I am changing it out and installing

Customer Question

I have an old Lennox 28g9801 and I am changing it out and installing a Honeywell rthl3550. I'm not sure of the wiring
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: The Lennox testator has terminals A,X,M,L,F,R,VR,Y,M2
JA: Is there anything else important you think the HVAC Technician should know?
Customer: I don't think so. Just need to know where to land the wires on the 3550
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 6 months ago.
Category: HVAC
Expert:  BillyHvac replied 6 months ago.
hello, can you tell me what terminal what color was on in old thermostat?
Customer: replied 6 months ago.
Customer: replied 6 months ago.
Yellow-Y not YouMail
Expert:  BillyHvac replied 6 months ago.
I am going to opt this to a Lennox tech familiar with older units.Billy
Customer: replied 6 months ago.
Expert:  Gaztech replied 6 months ago.
Here is a cross reference chart, it shows most of your existing wires
Expert:  BillyHvac replied 6 months ago. longer needed cap longer needed cap offBrn-F......GRed-R......OWht-M2....Y2