Thermo King VM-405 PBBD2 - Section 11 - System Leak Check Procedures; Overview; Testing System for Leaks

TK 56430-18-IP-EN
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Section 11 - System Leak Check Procedures
Overview
It is critical that the unit is leak free to ensure unit performance and reliability. This section outlines the leak check
procedure for all Vehicle Powered Truck units utilizing swash plate or reciprocating compressors.
IImmppoorrttaanntt:: Failure to properly eliminate system leaks will result in decreased system performance, reliability, and
compressor failures.
Testing System for Leaks
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Use a regularly calibrated electronic leak detector capable of detecting fluorine-based refrigerants, or use a leak check
solution to leak test the refrigeration system. Carefully inspect the entire system for refrigerant leaks.
Use this procedure for systems that are empty or have lost most of their refrigerant.
1. Attach a gauge manifold to the unit.
2. When using an electronic leak detector, connect the center hose from the gauge manifold to a refrigerant bottle
(same type refrigerant used in the system). Purge the center hose of any air. When using a soap solution, skip this
step and go to step 6.
3. Pressurize the system with a trace amount of refrigerant, approximately 2 to 3 psig (14 to 21 kPa).
4. Close both hand valves on the gauge manifold.
5. Disconnect the center hose to the gauge manifold from the refrigerant bottle.
6. Connect the center hose from the gauge manifold to a source of nitrogen. Pressurize the system with nitrogen gas
to the desired pressure. Refer to (Table 10, p. 99).
7. Close the supply valve on the nitrogen bottle.
8. Use electronic leak detector or a leak check solution to leak test the refrigeration system. If you detect leaks, loosen
the supply line hose fittings to release the pressure. Repair the leaks as necessary and recheck the system.
9. After leak testing is completed, remove the remaining trace amount of refrigeration and nitrogen.
10. Evacuate the system and charge per standard procedures.