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Old 07-25-2020, 06:10 PM   #1
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RunTru by Trane Wiring for Two Stage Furnace, Single Stage AC


My setup that I paid to have installed includes a A952V120DU5SAB, A4MXD4260AC3HA, A4AC4060A1000A. This is a two stage variable speed furnace and a single stage air conditioner. Ingersoll Rand only makes single stage ACs with the RunTru by Trane branding. The furnace installation guide doesn't have instructions for this setup. The installer's guide only supports 1:1 or 2:2. I am a newbie so I can't link to the document on their site.

My question is for this specific setup, on the furnace, should we be using the Y1 or Y2? For 1:1 it states to use Y1.

However, what makes this worse is that various current Trane thermostats installation instructions state to use Y2 and in some cases bypass both Y1 and Y2 on the furnace. In other words go from the outdoor unit direct to Y1 on the thermostat.

I want the fan to run at at the higher speed for AC. I think that's what is supposed to happen so I assume Y2 on the furnace. The installer used Y1. However, it's been running for six hours now straight and the house hasn't fully reached 73 F where I have it set. It's getting close, but not hitting it.

I trust my HVAC guy. I just want to know for myself.
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Old 07-25-2020, 06:18 PM   #2
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Re: RunTru by Trane Wiring for Two Stage Furnace, Single Stage AC


You may need a jumper between Y1 and Y2. Installer is supposed to do whatever's needed for a single stage a/c and set the airflow to match the size.

Everything should be detailed in the manual and you should call your installer back to address any deficiencies in the setup.
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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 07-27-2020, 01:47 PM   #3
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Re: RunTru by Trane Wiring for Two Stage Furnace, Single Stage AC


You can expect roughly 1 degree per hour temperature reduction when you start up an AC. I don't think the higher airflow is going to change that.

You can call the installer with any questions you have, but i think he got it right.
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Old 07-27-2020, 03:46 PM   #4
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Re: RunTru by Trane Wiring for Two Stage Furnace, Single Stage AC


^I don't know where those rules of thumb come from - 1F per hour, come on, it it depends on how the unit was sized, indoor humidity level and the heat gain.

Low airflow cuts capacity. It's easy to goof up t-stat wiring and setup a furnace so it doesn't move the correct amount of air.
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