Trane ReliaTel Diagnostic Manual page 22

Typical Control Box Layout
Figure 13. Typical Control Box Layout (T/YSC072-102E, T/YHC048-072E, & WSC060-090E)
Inducer
Transformer
(460/575 only)
Zone Sensor
22
Ignition Module
(IGN)
Zone Sensor or
Thermostat Connections
or Thermostat
ReliaTel Refrigeration
Module (RTRM)
TCI (COMM3/4) or
LCI Interface
24 VAC Control
Transformer
Low Voltage Terminal Strip
TEST 1
24 VAC
Fan Relay
Compressor
Contactors
OD Fan
Capacitor
Test Terminals
TEST 2
Compressor 1 Disable
Compressor 2 Disable
Immediate Shutdown,
Automatic Reset
RT-SVD03G-EN