Thermo King B Series Diagnostic Manual

Section 2 - System Description
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System Inputs
NOTE: Inputs are applicable for vehicles with
a single temperature/main load compartment,
or with bi-temperature/main and remote load
compartments.
System Outputs
Input Description Notes
Sensor 1
(Analog)
Return Air Sensor
(main evaporator)
Platform 1,
wires PNK,
BLK
Sensor 2
(Analog)
Return Air Sensor
(remote evaporator)
Platform 1,
wires G, B
ACC
(Digital)
On-the-road power to
unit controls.
Platform 1,
wire 03
BAT
(Analog)
Battery Voltage Level Platform 1,
wire BAT
STD BY
(Digital)
Electric Standby Option Platform 1,
wires X1, X4
DK1
(Digital)
Defrost Termination
(main evaporator)
Platform 1,
wire 12
DK2
(Digital)
Defrost Termination
(remote evaporator)
Platform 2,
wire 12A
LPCO
(Digital)
Low Pressure Cut-Out Platform 1,
wire LPCO
HP High Pressure
Transducer
Platform 1,
wires HP, 5V,
CHT
(analog)
OL
(Digital)
Overload Electric Motor
Protector (Electric
Standby)
Platform 1,
wire OL
DSW1
(Digital)
Door Switch 1 Platform 1,
wire DSW1
DSW2
(Digital)
Door Switch 2 Platform 2,
wire DSW2
EX1
(Digital)
Extra Relay 1 (for drain
heater, main compart.)
Platform 1
EX2
(Digital)
Extra Relay 2 (for drain
heater, remote
compartment)
Platform 2
DK3 Thermal motor
protection
Platform 1
(B-100 only)
AC_SW AC Switch Platform 1
(V-500 AC
only)
Output Description Notes
CLU1 Vehicle Compressor Clutch Platform 1
CLU2 Electric Standby Clutch Platform 1
RM Battery relay (B-100 only) Platform 1
CMC Compressor Motor
Contactor
Platform 1,
For Electric
Standby
option
PS1 Hot Gas Solenoid (defrost) Platform 1,
wire 26
PS2 Liquid Line Solenoid
(on remote evaporator)
Platform 2,
wire 33
PS3 Liquid Line Solenoid
(on main evaporator)
Platform 2,
wire B3
PS4 Hot Gas Solenoid
(defrost, remote
evaporator)
Platform 2,
wire 28
PS5 Condenser Solenoid (heat) Platform 1,
wire 26A
PS6 Liquid Line Solenoid
(AC system)
Platform 2
PS7 Pressure Regulating Line
Bypass (on main
evaporator suction line, MT
units)
Platform 2
PS8 Pressure Regulating Line
Bypass (on remote
evaporator suction line, MT
units)
Platform 2
CMCH Compressor Motor Electric
Heat Contactor (for Electric
Standby)
Platform 1
CF1 Condenser Fan 1 Platform 1
CF2 Condenser Fan 2 Platform 2
EF1,
EF2
Evaporator Fan 1, Fan 2
(main compartment)
Platform 1
DAS Communications with DAS Platform 1,
wires DL1,
DL2
EF3,
EF4
Evaporator Fan 3, Fan 4
(remote compartment)
Platform 2
EXR1 Extra Relay 1
(used for Drain Heater)
Platform 1
EXR2 Extra Relay 2
(used for Drain Heater)
Platform 2

Thermo King B Series Specifications

General

Refrigerant	R-404A
Application	Truck
Voltage	12V or 24V DC
Heating Capacity	Varies by model
Dimensions	Varies by model
Noise Level	Varies by model