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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8135
Experience:  Furnace, A/C and heat pump specialist.
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I have this furnace m1mb077abw bw. If I want to add AC how

Customer Question

I have this furnace m1mb077abw bw. If I want to add AC how do I wire for AC
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I have this furnace m1mb077abw bw. If I want to add AC how do I wire for AC Low voltage
Submitted: 8 months ago.
Category: HVAC
Expert:  airheatman replied 8 months ago.

The MIMB is ac ready which means it should have a mutli speed blower already for up to a 3 ton ac .Let me get you a wiring diagram

Expert:  airheatman replied 8 months ago.

You will need to run an 18/2 wire between furnace and outdoor unit and a wire from Y at thermostat.

Y wire will not need to connect to anything in furnace but most people run the wire from thermostat to furnace for a convenient junction location.

So we will have a C (Common) from furnace transformer to one side on contactor in outdoor and a Y wire fro thermostat to other side of contactor in outdoor..See drawing I made for you:

Expert:  airheatman replied 8 months ago.

If you have further questions, please let me know.

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Expert:  airheatman replied 8 months ago.

If thermostat does not have C, just go directly to C on board

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