FieldBench
Trane codes

Trane

Charge

Protect

Charge (SH piston / SC TXV)

Wrong charge method is as common as wrong charge.

Walk Charge in Diagnose

2 plates — walk the one on the cabinet

First check

1 Airflow and freeze before you add gas

On Trane XR16 low pressure / freeze is indoor airflow or a starved coil until proven otherwise. Filter, blower, dirty A-coil, closed supplies. In heat mode, a iced outdoor coil is the same family. Indoor piston: charge by superheat. Indoor TXV: charge by subcooling.

Expect: Indoor air moving. Coil not iced. OD coil clear in heat.

The rest of the walkthrough is Diagnose.

On the plates

  • Indoor piston: charge by superheat. Indoor TXV: charge by subcooling.
  • Do not use Greenspeed weigh-in-only as the only method unless the factory TXV rating plate on THIS outdoor says so. Most 24ACC are piston/TXV conventional.
  • Line-set length and indoor coil match still matter. Weigh-in after a repair, then finish on SH or SC.

Plates that use Charge

Same number, other makers

Charge on Trane is not the same code on these plates.