Trane ReliaTel Diagnostic Manual page 58

Thermostats and Sensors
BAYSENS008B/ASYSTAT663B (obsolete)
Accessory Heat / Cool Zone Sensor Module (ZSM), dual set point, manual / auto change over.
Figure 25. BAYSENS008B/ASYSTAT663B
BAYSENS009B/ ASYSTAT664B (obsolete)
Accessory Heat Pump Zone Sensor Module (ZSM), dual set point, manual/ auto changeover.
Figure 26. BAYSENS009B/ASYSTAT664B
Component Description
BAYSENS009B
ASYSTAT664B
58
Component Description
BAYSENS008B
ASYSTAT663B
RT-SVD03G-EN