What to do if Thermo King Control Unit is not cooling?
If your Thermo King Control Unit isn't cooling even when the box temperature exceeds the setpoint, first check the voltage on Pin 6 of C-9. If the issue persists, consider replacing the Cab Control Box.
How to troubleshoot a blank display on Thermo King V-500 Control Unit?
If the Thermo King Control Unit display is blank when you press the On/Off switch: 1. First, verify the voltage on Pin 3 of C-9 (or Pin 2 if the unit is in electric mode). 2. Second, check Fuse 4/1, located inside the Cab Control Box. 3. If the display remains blank, replace the Cab Control Box.
Why is the Thermo King Control Unit Operation LED off when cooling?
If the Unit Operation LED is OFF while your Thermo King Control Unit is cooling, begin by checking the voltage on Pin 7 of C-9. If the LED remains off, the next step is to replace the Cab Control Box.
General| Brand | Thermo King |
|---|---|
| Model | V-500 Series |
| Category | Control Unit |
| Language | English |
Explains the manual's goal to provide maintenance information for climate control units.
Lists the manual's chapters and their respective topics.
Lists information needed before contacting technical support for service.
Notes that blank pages at chapter ends are normal and do not indicate missing information.
Defines terms used to describe unit sides relative to the vehicle's direction.
Explains how to use model tables to identify unit information for service.
Outlines essential safety guidelines for handling equipment, tools, and hazardous substances.
Warns about automatic unit startup and necessary precautions before inspection or work.
Explains hazards associated with refrigerant exposure and necessary first aid measures.
Details precautions for handling refrigeration oil and first aid for exposure.
Covers risks of electrical shock, microprocessor sensitivity, and safe servicing procedures.
Advises on procedures to prevent damage when welding on units or truck chassis.
Emphasizes extreme caution with high voltage circuits and provides electrical shock first aid.
Highlights risks associated with low voltage but high current circuits and jewelry precautions.
Lists fuse ratings, condenser fan motor specs, evaporator fan motor specs, and coil specifications.
Details specific fuses and their protected circuits within the electrical system.
Details refrigerant charge, switch cutouts, and system pressures for R-134a and R-404A.
Provides details on main compressor types, oil capacity, oil type, refrigerant, and defrost methods.
Covers engine driven compressor belt tension, AC electric motor details, and electric standby power requirements.
Specifies solder types and joint clearances for refrigeration and hot water tubing connections.
Describes the Thermo King V-500 and V-500 MAX truck refrigeration systems.
Explains the functions and mounting of the condenser, evaporator, and compressor assemblies.
Details control circuits, in-cab control box, oil separator, refrigerant, and liquid injection system.
Lists standard unit features and explains protection features like pressure cutout switches.
Details the P.C. Board, connectors, and fuses within the control box.
Explains common relays, electric standby relays, overload relay, and unit operation modes.
Describes how the thermostat controls cooling/null modes and the defrost cycle initiation/termination.
Identifies locations for serial numbers and components of the refrigeration unit.
Explains the functions of keys, LEDs, and indicators on the M13 in-cab control box.
Guides on displaying temperatures, setting temperatures, and operating defrost mode.
Covers weekly inspections, starting the unit, after-start checks, loading, and post-load procedures.
Lists essential checks to be performed after unit operation to ensure proper function.
Details weekly, monthly, semi-annual, and annual checks for the electrical system.
Outlines weekly, monthly, semi-annual, and annual checks for the refrigeration and heating systems.
Lists weekly, monthly, semi-annual, and annual checks for structural components and coils.
Instructions on how to change the display between Celsius and Fahrenheit.
Lists procedures for electrical system checks with frequency intervals.
Provides symptoms and remedies for common issues with the M-13 and M-16 control boxes.
Explains how the defrost cycle works, its initiation, termination, and timer settings.
Details procedures for testing the defrost system, including the timer and termination switch.
Explains the function and testing of the CFPS switch for R-134a units.
Describes the function and testing of the liquid injection system for R-404A units.
Steps to test the liquid injection solenoid valve and metering orifice.
Guides on troubleshooting issues with the unit's electric standby operation.
Lists procedures for checking refrigerant level and replacing the dehydrator.
Step-by-step guide for charging the refrigeration system with refrigerant.
Methods for determining if the unit has an insufficient or correct refrigerant charge.
Procedures for ensuring adequate oil supply in the compressor, especially after refrigerant loss.
Explains the function, location, and testing of the HPCO switch.
Details the function, location, and testing procedure for the LPCO switch.
Step-by-step guide for cleaning the refrigeration system, especially after contamination.
Steps to follow after cleaning and servicing to return the unit to operational status.
Lists checks for leaks, damaged parts, defrost drains, belts, and mounting bolts.
Instructions for cleaning the evaporator and condenser coils to ensure proper airflow.
Guidance on periodically checking and torquing the unit mounting bolts for security.
Covers dangers of handling refrigerant bottles and safe recovery procedures.
Provides instructions on compressor handling, storage, position, and precautions during installation.
Details oil check intervals, return procedures, and compressor removal steps.
Covers clutch testing, removal, inspection, and installation procedures.
Instructions for removing, inspecting, and installing shaft seals and covers.
Steps for leak testing a compressor before installation to ensure system integrity.
Lists specific tools required for compressor maintenance and installation.
Emphasizes the importance of correct belt tension and pulley alignment for compressor installation.
Troubleshooting steps for when the compressor does not run or cycles too frequently.
Diagnosing problems like continuous operation, high box temperature, and head pressure.
Step-by-step checks for power at source, plug, terminals, and motor.
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