This issue occasionally occurs with the Blower coil product because the disconnect is not utilized as a test port during factory run testing.
When conducting the run test, we power the unit using a plug connector, bypassing the disconnect.
Unfortunately, there are instances where we mistakenly use the wrong disconnect because the part number is identical except for the last four digits.
To resolve this, please contact Trane Parts and provide them with the unit's serial number to obtain the correct disconnect. Alternatively, you can refer to the manufacturing part numbers listed below:
Single phase L1 and Neutral
Single phase L1 and L2
3 Phase L1, L2, L3