Trane ReliaTel Diagnostic Manual page 24

Typical Control Box Layout
Figure 15. Typical Control Box Layout (12½ - 25 tons)
RTOM (Options Module)
RTRM (Refrigeration Module)
Zone Sensor or Thermostat Connections
Zone Sensor
24
TCI (or LCI)
Communication Module
24 VAC Control
Transformer
or Thermostat
Ignition Module
Fan Relay
Compressor Contactors
Low Voltage
Terminal Block
Test Terminals
TEST 1
24 VAC
TEST 2
Compressor 1 Disable
Compressor 2 Disable
Immediate Shutdown,
Automatic Reset
RT-SVD03G-EN