Thermo King T-1000R, Maintenance Manual

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Electrical Maintenance 8-9
EXPANSION MODULE (SPECTRUM SYSTEMS ONLY [T-SERIES SPECTRUM AND UT
SPECTRUM])
The expansion module allows for up to three temperature controlled zones. The module provides the interface between the
base controller and the Zone 1, Zone 2, and Zone 3 (if used) multi-temperature components such as sensors, solenoids, valves,
and fan motors. It also uses Smart FETs to provide overcurrent and short circuit protection for the associated circuits.
All engine functions and the condenser unit valves are controlled by the base controller. This includes the receiver tank
pressure solenoid (RTPS), condenser inlet solenoid (CIS), hot gas bypass solenoid (HGBS), purge valve (PV), and liquid
injection solenoid (LIS). In addition the liquid line solenoid for Zone 1 (LLS) is controlled by the base controller. All other Zone
1 devices and all other remote evaporators are controlled by the expansion module.
Load power is supplied by the 2AA wire to the expansion module via the 2A terminal stud. Power from the 8X circuit in the
base controller is supplied to the expansion module via the YEL wire in the 8 pin connector. The expansion module communicates
with the base controller via a CAN bus connection. All remote zone input and solenoid output functions are connected via the
expansion module 35 pin connector harness. Remote evaporator fan motor outputs are provided for 6 variable speed remote fan
motors. Each output is capable of operating two fans.
There are no user replaceable components on the expansion module. Refer to the Truck SR-2 Multi Temp Diagnostic Manual
TK 54293 for more information about the Expansion module.
Expansion Module LEDs
The expansion module has LEDs that indicate which outputs are energized. These LEDs are located in the corner of the
expansion module body and are defined in the following table. An LED is illuminated when its associated circuit output is
energized. The circuit outputs are protected by Smart FETs. All the LEDs are red, except LED HBEAT, which is green.
1. Expansion Module LEDs
Expansion Module
Expansion Module LED Functions
LED Function
F01 Fan 1 (Zone 1 FM1-A)
F02 Fan 2 (Zone 1 FM1-B)
F03 Fan 3 (Zone 2 FM2-A)
F04 Fan 4 (Zone 2 FM2-B)
F05 Fan 5 (Zone 3 FM3-A)
F06 Fan 6 (Zone 3 FM3-B)
DTH1 Zone 1 Drain Tube Heater
DTH2 Zone 2 Drain Tube Heater
DTH3 Zone 3 Drain Tube Heater
HGS1 Zone 1 Hot Gas Solenoid
1