TK 55676-19-IM-EN
49
A/C System Evacuation and Leak Check Procedures
Evacuation Procedures
N
No
otte
e:: See “System Evacuation Standards“ in Section 12 of the Thermo King TriPac Installation Standards Guide (TK
56498). THESE STANDARDS MUST BE FOLLOWED!
Evacuation Procedures
Thermo King Evacuation Station (P/N 204-725)
Recommended
Evacuation Station Operation and Field Application
Instructions (TK 40612)
Electronic Leak Detector (204-756)
Gauge Set with R134a Adapters
N
No
otte
e:: The oil in the evacuation station vacuum pump should be changed after each use.
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ntt:: Always use recommended vacuum equipment. Before each use, check that there are no leaks in the vacuum
equipment either in the pump itself or in the hoses.
1. Connect the gauge manifold to the suction and discharge service ports of the APU’s compressor.
2. Connect the service line of the gauge manifold to the vacuum pump and micron gauge.
3. Open the gauge manifold and vacuum pump valves and gauge manifold hand valves
4. Start the vacuum pump and evacuate until system reaches 500 microns.
5. Once the system reaches 500 microns, continue evacuation for one additional hour.
N
No
otte
e:: To save installation time, while the system is being evacuated, continue on to the electrical installation beginning
with “Control Box and Main Harness Installation” . Return and complete this procedure later.
6. Close the vacuum pump valve, switch off the pump, checking that the gauge reading for the vacuum pump does not
exceed 2000 microns in the following five minutes. If vacuum level exceeds 2000 microns before five minutes, and
continues to rise, proceed to the L
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7. If vacuum level remains below 2000 microns for 5 minutes the system is leak free and ready to be filled with
refrigerant
8. Close manifold hand valves and remove evacuation equipment.
Leak Check Procedures
N
No
otte
e:: See “System Leak Check Standards“ in Section 12 of the Thermo King TriPac Installation Standards Guide (TK
56498). THESE STANDARDS MUST BE FOLLOWED!
1. Add vapor R-134a to the unit until bottle pressure is reached.
2. Thoroughly leak check the system with an electronic leak detector.
3. If leak(s) are found, recover leak check charge.
4. Repair any leaks and re-evacuate system.
