I had a trane two stage heating/cooling system (XL18i) installed recently and the system is working. The installer however made a mistake in installing the Media Filter Box in reverse resulting in the Media Filter can only be inserted where the arrow on the filter is against the airflow. He is coming to take a look and I hope he will fix this.
With this mistake, I thought I am going to check all the wiring too as I have heard on forums that they sometimes wire the two stage systems wrong.
It is about the Y terminals. Outdoor unit documentation says connect Y1 (YL/BK) to Yo and Y2 (YL/RD) to Y2. The Furnace Documentation says connect Y to Y1 (YL/BK) and BK to Y2 (YL/RD). On the Furnace control board I have a YLo,Y,W,W2,R,G,C,O,BK/DS/DHUM
Y -->Y -->YL/BK
Y2 -->YLo -->YL/RD
R -->R (goes through two float switches in serial before coming to Furnace)
So based on diagram looks like Y2 instead of being connected to YLo on the furnace side should be connected to BK and to YL/BK on condenser, is this correct or is the current wiring OK ?
When asked how to determine what stage coolling is currently running I was told that you cannot tell as it is all automatic between single stage and second stage.
I purchased two stage cooling for excessive humidity problem and I want to make sure I am running first stage cooling most of the time.