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I installed a new 2 stage TM8V furnace last fall. I kept my old single stage condensing unit. Because this is a 2 stage furnace, it can be wired for a 2 stage condenser or heat pump. I wired the signal to Y1. I only get low speed on the cooling which is insufficient. If I wanted the high speed, would I then wire it to Y/Y2 or just jump Y1 to Y/Y2. Thanks-:plain:
 

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The install manual should say how to wire a single stage condenser - Y1 and Y2 may have to be jumpered as Y1 call is always present when power is applied to Y2 by t-stat in a 2-stage setup.

Also set the dip switches to match the size of a/c. 350 to 450 cfm per ton. (lower than 400 cfm per ton improves dehumidification at the expense of capacity/efficiency, higher cfm does the opposite)

The factory setting is usually the maximum - 1200, 1600 or 2000 cfm, too much airflow for smaller units.
 
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