Thermo King V-200 User manual

V-200/V-300 Series
TK 50982-1-MM (Rev. 3, 02/03)
Copyright© 2003 Thermo King Corp., Minneapolis, MN, USA.
Printed in USA.

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This manual is published for informational purposes only and the information so provided should
not be considered as all-inclusive or covering all contingencies. If further information is required,
Thermo King Corporation should be consulted.
Sale of product shown in this manual is subject to Thermo King’s terms and conditions
including, but not limited to, the Thermo King Limited Express Warranty. Such terms and
conditions are available upon request. Thermo King’s warranty will not apply to any
equipment which has been “so repaired or altered outside the manufacturer’s plants as,
in the manufacturer’s judgment, to effect its stability.”
No warranties, express or implied, including warranties of fitness for a particular
purpose or merchantability, or warranties arising from course of dealing or usage of
trade, are made regarding the information, recommendations, and descriptions
contained herein. Manufacturer is not responsible and will not be held liable in contract
or in tort (including negligence) for any special, indirect or consequential damages,
including injury or damage caused to vehicles, contents or persons, by reason of the
installation of any Thermo King product or its mechanical failure.
The maintenance information in this manual covers unit models:
V-200-10 (918247) V-300-10 (918260)
V-200-20 (918248) V-300-20 (918261)
V-200 MAX-10 (918249) V-300 MAX-10 (918262)
V-200 MAX-20 (918250) V-300 MAX-20 (918263)
V-200 MAX TC-10 (918255) V-300 MAX TC-10 (918264)
V-200 MAX TC-20 (918256) V-300 MAX TC-20 (918265)
V-200 MAX TC-20 SAFEWAY (919966)
For further information, refer to:
V-200/V-300 Series Operating Manual TK 51877
V200 Series Parts manual TK 50781
V300 Series Parts Manual TK 51308
V200 MAX TC TK 51140
Diagnosing Thermo King Refrigeration Systems TK 5984
Evacuation Station Operation and Field Application TK 40612
Tool Catalog TK 5955
The information in this manual is provided to assist owners, operators and service people in the proper
upkeep and maintenance of Thermo King units.

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Recover Refrigerant
At Thermo King, we recognize the need to preserve the environment
and limit the potential harm to the ozone layer that can result from
allowing refrigerant to escape into the atmosphere.
We strictly adhere to a policy that promotes the recovery and limits
the loss of refrigerant into the atmosphere.
In addition, service personnel must be aware of Federal regulations
concerning the use of refrigerants and the certification of
technicians. For additional information on regulations and technician
certification programs, contact your local Thermo King dealer.
WARNING: Use ONLY Polyol Ester based refrigeration compressor oil (TK P/N 203-413) in
R-404A and R-134a units.
DO NOT use Polyol Ester based oil in standard Thermo King units.
DO NOT mix Polyol Ester and standard synthetic compressor oils.
Keep Polyol Ester compressor oil in tightly sealed containers. If Polyol Ester oil becomes
contaminated with moisture or standard oils, dispose of properly—DO NOT USE!
WARNING: When servicing Thermo King R-404A and R-134a units, use only those service
tools certified for and dedicated to R-404A or R-134a refrigerant and Polyol Ester
compressor oils. Residual non-HFC refrigerants or oils will contaminate R-404A and
R-134a systems.
R-404A/R-134a

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Table of Contents
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
General Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Refrigeration Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
High Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
R-134A REFRIGERATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
R-404A REFRIGERATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance Inspection Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
In-Cab Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Oil Separator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Liquid Injection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Evaporator Drain Tube Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electric Standby Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Protection Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
P.C. Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Common Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Standby Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Multi-Temp Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Defrost Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Clutch Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
EFR Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Thermostat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Serial Number Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
In-Cab Control Box Operating Instructions (M-13, M-16, M-17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Display Return Air (Box) Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Display Setpoint Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Enter Setpoint Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Defrost Mode Operation (M-13, and M-16 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Weekly Pretrip Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Starting the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
After Start Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Loading Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Post Load Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table of Contents
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Electrical Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Trouble Shooting In-Cab Control Box M-13 and M-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Trouble Shooting M-17 In-Cab Control Box (TC Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Defrost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Defrost Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Defrost Timer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Manual Defrost Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Defrost Termination Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Defrost Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Defrost Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Testing The Defrost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Defrost Timer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Condenser Fan Pressure Switch (CFPS) R-134a Units Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Testing CFPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Liquid Injection System (R-404A Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Testing Liquid Injection Valve And Metering Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Electric Standby Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Refrigeration Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Charging the Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Checking the Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Checking Compressor Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
High Pressure Cutout Switch (HPCO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Low Pressure Cutout Switch (LPCO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Cleanup Procedure for Small Truck Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Refrigeration Service Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
High Pressure Cutout And Condenser Fan Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Oil Separator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Liquid Injection Metering Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Testing the Liquid Injection Solenoid Valve and Metering Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Discharge Check Valve (Model 20 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Testing the Discharge Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Check Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Check Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Expansion Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Low Pressure Cutout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Suction Receiver Tank (Heat Option Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Suction Pressure Regulator Valve (TC Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
In-line Check Valves (TC Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Replacing Refrigerant Hoses (Speedy Clip System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Structural Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Unit Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Table of Contents
7
Clutch Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Clutch Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Clutch Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Clutch Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Shaft Seal Cover and Shaft Seal: Removal And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
System Compressor and Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Checking the Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Belt Tensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Engine Driven Compressor Belt and Pulleys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Electric Standby Compressor Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Over-the-Road Mechanical Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Electric Standby Mechanical Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Electric Standby Service Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Refrigeration Diagnosis Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Diagram Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Table of Contents
8

9
List of Figures
Figure 1: Typical P.C. Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 2: P.C. Board Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 3: Fuse 4/1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 4: Thermostat Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5: Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 7: Control Box Side Of Model 20 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 8: Refrigeration Component Side of Model 20 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 9: M13 & 16 In-Cab Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 10: M-17 In-Cab Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11: On/Off Key & LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 12: Celsius/Fahrenheit LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 13: Setpoint Key & Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 14: Misc. LED’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 15: Defrost Key & LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 16: On/Off Key and Defrost Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 17: Setpoint Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 18: Entering Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 19: BLOCK DIAGRAM M-13, M-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 20: BLOCK DIAGRAM M-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 21: Defrost Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 22: Testing CFPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 23: Charging Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 24: High Pressure Cutout Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 25: Connecting Flushing Compressor to Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 26: Refrigeration Systems In Model 20 Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 27: Engine Driven Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 28: Check Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 29: Location of Expansion Valve Bulb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 30: Completely Wrap Bulb with Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 31: Cutting The Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 32: Fitting The Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 33: Lubricating The Cylinder Of The Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 34: Manually Inserting The Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 35: Positioning The Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 36: Fitting The Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 37: Tightening Both Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 38: Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 39: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 40: Remove Center Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 41: Remove Drive Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 42: Remove Snap Ring and Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 43: Remove Pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 44: Remove Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 45: Inspect Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 46: Install Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 47: Install Pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 48: Install Cover and Snap Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 49: Install Shims and Drive Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

List of Figures
10
Figure 50: Remove Shaft Seal Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Figure 51: Remove Shaft Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Figure 52: Inspect Shaft Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 53: Place Guide on Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 54: Place Shaft Seal on Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 55: Press Seal Into Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 56: Install Shaft Seal Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Figure 57: Proper Shaft Seal Cover Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Figure 58: Clutch Remover P/N 204-806 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Figure 59: Compressor Holder P/N 204-807 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Figure 60: Clutch Installation Kit P/N 204-890 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Figure 61: Snap Ring Pliers P/N 204-808 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Figure 62: Shaft Seal Kit P/N 204-805 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Figure 63: Pulley Arbor P/N 204-804 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Figure 64: Draining the Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

11
Safety Precautions
General Practices
1. ALWAYS WEAR GOGGLES OR SAFETY
GLASSES. Refrigerant liquid, refrigeration
oil, and battery acid can permanently damage
the eyes (see First Aid under Refrigeration
Oil).
2. Never operate the unit with the compressor
discharge valve closed.
3. Keep your hands, clothing and tools clear of
the fans and belts when the unit is running.
This should also be considered when opening
and closing the compressor service valves.
4. Make sure gauge manifold hoses are in good
condition. Never let them come in contact
with a belt, fan motor pulley, or any hot
surface.
5. Never apply heat to a sealed refrigeration
system or container.
6. Fluorocarbon refrigerants, in the presence of
an open flame or electrical short, produce
toxic gases that are severe respiratory irritants
capable of causing death.
7. Make sure all mounting bolts are tight and are
of correct length for their particular
application.
8. Use extreme caution when drilling holesin the
unit. The holes may weaken structural
components, and holes drilled into electrical
wiring can cause fire or explosion.
9. Use caution when working around exposed
coil fins. The fins can cause painful
lacerations.
10. Use caution when working with a refrigerant
or refrigeration system in any closed or
confined area with a limited air supply (for
example, a truck box or garage). Refrigerant
tends to displace air and can cause oxygen
depletion resulting in suffocation and possible
death.
11. EPA Section 608 Certification is needed to
work on refrigeration systems.
Refrigerant
Although fluorocarbon refrigerants are classified
as safe refrigerants, certain precautions must be
observed when handling them or servicing a unit
in which they are used. When exposed to the
atmosphere from the liquid state, fluorocarbon
refrigerants evaporator rapidly, freezing anything
they contact.
First Aid
In the event of frost bite, the objectives of First
Aid are to protect the frozen area from further
injury, to warm the affected area rapidly and to
maintain respiration.
• EYES: For contact with liquid, immediately
flush eyes with large amounts of water and get
prompt medical attention.
• SKIN: Flush area with large amounts of
lukewarm water. Do not apply heat. Remove
contaminated clothing and shoes. Wrap burns
with dry, sterile, bulky dressing to protect
from infection/injury. Get medical attention.
Wash contaminated clothing before reuse.
• INHALATION: Move victim to fresh air and
use CPR if necessary. Stay with victim until
arrival of emergency medical personnel.
Refrigeration Oil
Avoid refrigeration oil contact with the eyes.
Avoid prolonged or repeated contact of
refrigeration oil with skin or clothing. Wash
thoroughly after handling refrigeration oil to
prevent irritation.
First Aid
In case of eye contact, immediately flush with
plenty of water for at least 15 minutes. Wash skin
with soap and water. CALL A PHYSICIAN.
Electrical Hazards
High Voltage
When servicing or repairing a refrigeration unit,
the possibility of serious or even fatal injury from
electrical shock exists. Extreme care must be used

Safety Precautions
12
when working with an operating refrigeration
unit. Lethal voltage potentials can exist on
connections in the high voltage tray of the control
box.
Precautions
1. When working on high voltage circuits on the
refrigeration unit, do not make any rapid
moves. If a tool drops, do not grab for it.
People do not contact high voltage wires on
purpose. It occurs from an unplanned
movement.
2. Use tools with insulated handles that are in
good condition. Never hold metal tools in
your hand if exposed, energized conductors
are within reach.
3. Treat all wires and connections as high
voltage until a meter and wiring diagram show
otherwise.
4. Never work alone on high voltage circuits on
the refrigeration unit, another person should
always be standing by in the event of an
accident to shut off the refrigeration unit and
to aid a victim.
5. Have electrically insulated gloves, cable
cutters and safety glasses available in the
immediate vicinity in the event of an accident.
First Aid
IMMEDIATE action must be initiated after a
person has received an electrical shock. Obtain
immediate medical assistance if available.
The source of shock must be immediately
removed by either shutting down the power or
removing the victim from the source. If it is not
possible to shut off the power, the wire should be
cut with either an insulated instrument (e.g., a
wooden handled axe or cable cutters with heavy
insulated handles) or by a rescuer wearing
electrically insulated gloves and safety glasses.
Whichever method is used do not look at the wire
while it is being cut. The ensuing flash can cause
burns and blindness.
If the victim has to be removed from a live circuit,
pull the victim off with anon-conductive material.
Use the victim’s coat, a rope, wood, or loop your
belt around the victim’s leg or arm and pull the
victim off. DO NOT TOUCH the victim. You can
receive a shock from current flowing through the
victim’s body. After separating the victim from
power source, check immediately for the presence
of a pulse and respiration. If a pulse is not present,
start CPR (Cardio Pulmonary Resuscitation) and
call for emergency medical assistance. If a pulse
is present, respiration may be restored by using
mouth-to-mouth resuscitation, but call for
emergency medical assistance.
Low Voltage
Control circuits used in the refrigeration unit are
low voltage (12/24 volts dc). This voltage
potential is not considered dangerous, but the
large amount of current available (over 30
amperes) can cause severe burns if shorted or
ground.
Do not wear jewelry, watch or rings. These items
can short out electrical circuits and cause severe
burns to the wearer.

13
Specifications
GENERAL
Compressor TK208R, or SELTEC TM-13XD
or SELTEC TM-15XD
Compressor Oil Charge 1 Compressor systems 12 oz. (354.8 ml)
2 Compressor systems 24 oz. (709.7 ml)
Compressor Oil Type Polyol Ester P/N 203-413
Defrost Method: Hot gas
Defrost Timer: Initiation Interval Adjustable, 1 hour to 10 hours
TerminationInterval Termination is not timed.
Defrost is terminated by Klixon switch.
R-134A REFRIGERATION SYSTEM (V-200/V-300-10, V-200/V-300-20)
Refrigerant Charge V-200 3.0 lbs. (1.36 Kg)
V-300 3.85 lbs. (1.75 Kg)
Defrost Termination Switch: Opens 48.0 ± 5.4 F (8.9 ±3.0 C)
Closes 36.0 ± 5.4 F (2.2 ± 3.0 C)
High Pressure Cutout Switch: Opens 300 ± 10 psi (2068 ±69 kPa)
Closes 200 ± 20 psi (1378 ± 69 kPa)
Low Pressure Cutout: Opens 5 to 11 in. Hg vacuum (-17 to -34 kPa)
Closes 4 to 7 psi (28 to 48 kPa)
Condenser Fan Pressure Switch: Opens 130 ± 10 psi (896 ± 69 kPa)
Closes 180 ± 10 psi (1241 ± 69 kPa)

Specifications
14
R-404A REFRIGERATION SYSTEM (V-200/V-300 Max-10, V-200/V-300
Max-20, V-200/V-300 Max TC-10, V200/300-Max TC-20)
Refrigerant Charge V-200 2.75 lbs. (1.25 Kg)
V-200TC 4.00 lbs. (1.81 Kg)
V-300 4.00 lbs. (1.81 Kg)
Defrost Termination Switch: Opens 48.0 ± 5.4 F (8.9 ± 3.0 C)
Closes 36.0 ± 5.4 F (2.2 ± 3.0 C)
Liquid Injection Switch: Opens 200 ± 5 F (93 ± 3 C)
Closes 230 ± 5 F (110 ± 3 C)
High Pressure Cutout Switch: Opens 450 ± 10 psi (3100 ± 69 kPa)
Closes 375 ± 10 psi (2585 ± 69 kPa)
Low Pressure Cutout: Opens 5 to 11 in. Hg vacuum(-17 to -34 kPa)
Closes 4 to 7 psi (28 to 48 kPa)
Suction Pressure Regulator 26 psi (180 kPa)
Condenser Solenoid Pressure Switch: Opens 300 ± 10 psi (2068 ± 69 kPa)
Closes 200 ± 20 psi (1378 ± 69 kPa)

Specifications
15
ELECTRICAL SYSTEM
Fuses
Fuse 1: Evaporator Fan Motor (EF1) 12V Units = 15 amps, 24V Units = 10 amps
Fuse 2: Evaporator Fan Motor (EF2) 12V Units = 15 amps, 24V Units = 10 amps
Fuse 3: 2A Circuits 12V Units = 25 amps, 24V Units = 20 amps
Fuse 4: 2R1 Circuit 12V & 24V Units =3 amps
Fuse 4/1: Cab Control Box 12V & 24V Units = 3 amps
Fuse 5 on TC Units: Remote Evaporator Fan Motor (EF3) 12V Units = 5 amps, 24V Units = 3 amps
Fuse 6 on TC Units: Transformer Fuse 12V & 24V Units = 4 amps
Fuse 7: Defrost Circuit 12V & 24V Units =1 amps
Condenser Fan Motors
Voltage Full Load rpm Full Load Current
12 Vdc 2800 8.0 to 9.5 amps @ 13Vdc
24 Vdc 2800 3.9 to 4.1 amps @ 26Vdc
Evaporator Fan Motors
Voltage Full Load rpm Full Load Current
12 Vdc 2800 6.1 to 6.2 amps @ 13Vdc
24 Vdc 2800 3.5 to 3.9 amps @ 26Vdc
Coils for Hot Gas Solenoids, Condenser Solenoids, and Liquid Line Solenoids
Voltage Current Resistance
12 Vdc 2.3 amps 5.2 ohms
24 Vdc 1.3 amps 20 ohms
Liquid Injection Solenoid Coils
Voltage Current Resistance
12 Vdc 0.7 amps 17 ohms
24 Vdc 0.2 amps 67 ohms
BELT TENSION (Using Tool P/N 204-427) Field Reset
Engine Driven Compressor Belt 58
Electric Standby Compressor Belt 58

Specifications
16

17
Maintenance Inspection Schedule
Weekly Monthly Semi-
Annual Annual Inspect/Service These Items
ELECTRICAL
••Check defrost initiation and termination.
••Check thermostat cycle sequence.
••Check operation of protection shutdown circuits.
•Check thermostat and thermometer calibration in 0 C (32 F)
ice-water bath.
•Inspect wire harness for damaged wires or connections.
•Inspect/replace DC fan motor brushes.
REFRIGERATION
••Check refrigerant level.
•Replace dehydrator.
STRUCTURAL
••••Visually inspect unit and refrigerant hoses for fluid leaks.
••••Visually inspect unit for damaged, loose or broken parts.
••••Clean defrost drains.
•••Inspect belts for condition and proper tension (belt tension tool P/N
204-427).
•••Clean entire unit including evaporator coil and condenser coil.
••Check all unit mounting bolts, brackets, lines, hoses, etc.

Maintenance Inspection Schedule
18

19
Unit Description
Introduction
The Thermo King V-200/V-300 and V-200/V-300
MAX truck refrigeration systems are designed for
low and mediumtemperatureapplications on vans
and small-sized trucks with one compartment.
The V-200/V-300 MAX TC systems control the
temperatures in two compartments. There are two
basic models:
•Model 10: Cool and defrost on truck engine
driven compressor operation.
•Model 20: Cool and defrost on both truck
engine driven compressor operation and
electric standby compressor operation.
The system consists of at least three separate
assemblies: the condenser, the evaporator, and the
compressor. TC units have an additional
evaporator for the second compartment and an
optional TC/heat kit.
Condenser
The condenser has a unique design that allows it
to be mounted horizontally on the roof, or on the
front of the truck box.
Evaporator
An evaporator is mounted on the ceiling inside the
truck box. The additional evaporator for the TC
unit is also mounted on the ceiling inside the truck
box.
Compressor
The compressor is mounted on and driven by the
truck engine. Refrigeration hoses or lines are used
to connect the condenser, the evaporator, the
compressor and any other components. Model 20
units have another compressor and an electric
motor mounted in the condenser section for
electric standby operation.
The engine compressor is driven by a belt from
the engine. The electric standby compressor is
connected in parallel with the engine-driven
compressor. The standby compressor is driven by
a belt from the electric motor. Both compressors
use the same refrigeration system circuit. Check
valves isolate one compressor from the other
during operation.
Compressor operation is controlled by the
thermostat, which energizes the compressor
clutch during engine operation or starts the
electric motor and energizes the compressor
clutch on electric standby operation. The
refrigeration system is protected by a high
pressure cutout switch and a low pressure cutout
switch.
When plugged into standby power, engine
operation is automatically locked out. If the truck
engine is turned on while the power cord is still
plugged into a power receptacle, the unit will
remain working in electric mode; the engine
driven compressor cannot be started until the
power cord is unplugged from the unit as the
selection of engine operation or standby operation
is automatic.

Unit Description
20
Control Circuits
The control circuits operate on 12V or 24V DC
supplied by the truck batteries for engine
operation. On standby operation, the power is
rectified from an AC transformer.
In-Cab Control Box
Unit operation is controlled with an in-cab control
box, which is mounted in the truck cab. It includes
an On-Off switch, manual defrost switch,
thermometer, thermostat, thermostat adjustment,
and indicator lights.
The TC unit has an additional in-cab control box
to operate the second compartment. It is switched
on and off from the main in-cab control box and
includes a thermometer, thermostat, thermostat
adjustment and indicator lights.
Oil Separator
An oil separator is a standard feature on all these
units. The oil separator separates compressor oil
from refrigerant vapor and returns the oil to the
compressor through the suction line. The oil
separator helps provide positive oil return at high
compressor speeds and low operating
temperatures. This feature enhances compressor
lubrication and extends compressor life.
Refrigerant
The V-200-10/V-300 and V-200/V-300-20 units
use R-134a refrigerant. The V-200/V-300
Max-10, V-200/V-300 Max-20, V-200/V-300
Max TC-10, V-200/V-300 Max TC-20 units use
R-404A refrigerant.
Liquid Injection System
V-200/V-300 MAX and V-200/V-300 MAX TC
units use R-404A and have a liquid injection
system to limit discharge temperature of the
engine driven compressor. If the discharge gas
leaving the compressor reaches a temperature of
230 ± 5 F (110 ± 3 C) the liquid injection switch
closes, providing voltage to the liquid injection
solenoid. The solenoid opens a valve, allowing
liquid refrigerant to flow from the liquid line near
the drier inlet to the metering orifice attached to
the suction line fitting on the engine driven
compressor. As the refrigerant passes through the
metering orifice it expands and evaporates,
cooling the suction gas entering the compressor.
This cooling effect is transferred to the discharge
gas leaving the compressor from the adjacent
cavity in the compressor head. When the
discharge gas is cooled to 200 ± 5 F (93 ± 3 C),
the liquid injection switch opens, the liquid
injection solenoid closes and refrigerant no longer
flows through the liquid injection system.
Evaporator Drain Tube Heaters
Evaporator heaters are used in R-404A units to
avoid drain tube blockage because of ice
accumulation inside the evaporator. Two
harnesses are located inside the drain tube. These
resistive wires melt the ice while the unit is in
DEFROST mode.
Electric Standby Operation
During electric standby operation, the thermostat
controls the operation of the unit by energizing
and de-energizing the power relay, the electric
relays, and the heat contactor. The thermostat
places the unit in cool by energizing the power
relay and the electric relays.
The thermostat places the unit in null by
de-energizing all the relays and contactors. The
thermostat places the unit in heat by energizing
the heat contactor.
When the power relay and the electric relays are
energized, they close contacts that energize the
fan relay, the motor contactor, and the electric
standby compressor clutch.
When the heat contactor is energized, it energizes
the electric evaporator heaters and the fan relay.