Terminal Tractor Part 3

Question 1

How do you convert refrigerant capacities to/from Ounces/Pounds?

Answer 1

Use the chart provided

There are 16 Ounces of refrigerant per Pound.

Question 2

What type of oil is used in R134 Freon systems?

Answer 2

PAG Oil

PAG Oil is available in different Viscosities(46,68, 100, 150)

Question 3

What should you do when replacing A/C components?

Answer 3

Replace the oil held in that component when charging the system, in addition to the oil removed during refrigerant recovery

The correct quantity of oil is dependent on the vehicle/system. Refer to OEM vehicle service manual for specific information.

Question 4

How do you obtain fault codes?

Answer 4

Use the OEM Software (DL8, Volvo PTT, KW ESA)

Refer to the OEM’s Service Information for troubleshooting, and repair information. (DTNAConnect, Fleet Impact, KW Service Net)

Question 5

What does the blue light indicate during A/C system charging with Robin Air CoolTech?

Answer 5

Low side charging

Red light indicates high side charging

Question 6

What should you do when prompted to inject oil during A/C system charging with Robin Air CoolTech?

Answer 6

Press STOP/NO if oil was injected in the last step

After hitting START/YES, the display reads: CHARGING IN PROGRESS/DO NOT DISTURB X.XX LBS. (X.XX KG)

Question 7

What should you do when recovering refrigerant with Robin Air CoolTech?

Answer 7

Connect high and low side hoses, open coupler valves, and press the RECOVER button

After recovery is complete, the display will show RE

Question 8

Recover Refrigerant

Answer 8

Empty the oil drain, or make note of current level.
Connect high and low side hoses, and open the coupler valves on the hose ends.
Press the RECOVER button.
When the system has recovered to 0 psi, the vacuum pump will start and run until recovery is complete.
The unit then goes into an automatic oil drain- Up to 90 seconds.
After recovery is complete the display will show RECOVER COMPLETE.

Question 9

Troubleshooting Information

Answer 9

The quantity of oil drained must be injected back into the system during the Charging process.
If pressures are incorrect, and you have performed all pre-checks of the system, and have found nothing to be out of order, you should recover the system.
Note the amount of refrigerant recovered, if significantly low, you may have a leak, and need to inspect further.
If significantly high, a technician may have charged the system incorrectly.
After recovery, perform an evacuation, and leak test, if passed, recharge the system with the correct refrigerant and oil charge.
After a proper recharge, check system operation and pressures according to the correct chart.

Question 10

Pre-Checks

Answer 10

Clutch Won’t Engage.
The following conditions must be met for the clutch to engage.
Connect A/C Machine to Tractor, set A/C to on, and MAX cold.
Connect to the truck and launch Diagnostic Link, and navigate to the Instrumentation/HVAC Tab.
Engine Idling above 450 RPM.

Question 11

Oil Capacities

Answer 11

When replacing these components, you should add the following amounts of oil. However, you should NOT add more than 6 ounces, in ADDITION to the amount of oil that was recovered during the evacuation process.
High Pressure Line 12 oz.
Low Pressure Line 20 oz.
Condenser 10 oz.
Evaporator 30 oz.
Receiver-Drier 3 oz.

Question 12

Shop Exercise

Answer 12

Freightliner Cascadia.
Work together as a TEAM.
Wear PPE, and use Wheel Chocks.
Complete ALL Pre-Checks.
Complete the A/C Performance Inspection.
Set up the A/C Machine.
Perform a Reclaim/Vacuum/Leak Test/Recharge with the A/C Machine.

Question 13

Safety and Compliance

Answer 13

Don’t mix R134a with air to test for leaks. If the mixture contains enough air and is under pressure a fire could ignite.
Don’t breathe the refrigerant mist or vapor. It can cause irritation to the eyes, nose, and throat.
Never use a disposable refrigerant container to store recycled refrigerant.
Never transfer refrigerant into tank unless DOT approved. (DOTBA or 4BW)
Never fill a recovery storage tank to more than 60% of its rated capacity.
Don’t handle any chemical or refrigerant if you aren’t familiar with the SDS (Safety Data Sheet).
Don’t make repairs to the A/C Machine. Only Filter replacements. (Z003660) and change vacuum pump oil. (2003327).
Remember, the A/C system is always under pressure.
Always Wear PPE.

Question 14

Evacuate the System

Answer 14

Hoses should still be connected.
Press VACUUM. Press START/YES to perform the default activation (10 Minutes) Otherwise enter a custom time (e.g. 20 Minutes).
After evacuation, the unit will ask if you

Question 15

What should be replaced in the A/C Machine?

Answer 15

Only Filter replacements

Z003660

Question 16

When should Vacuum Pump Oil be changed?

Answer 16

Vacuum Pump Oil should be replaced every 10 hours of run time. The machine will give you a prompt to change it.

2003327

Question 17

What should you do after evacuating the system?

Answer 17

The system is now empty, and under a vacuum.

LEAK TEST FAILED if this test fails.

Question 18

When should you perform a Performance Test on the A/C system?

Answer 18

Perform after completing all pre-checks to test A/C system performance.

Question 19

What should you do when opening the system for an extended time?

Answer 19

When opening the system for an extended time(15+ Minutes), cover, or plug lines/components to prevent contamination.