Thermo King VM-405 PBBD2 - Units with Oil Return Hose; Units with Jet Cool (Liquid Injection System); Suction Line Routing and P-Trap Formation

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TK 56430-18-IP-EN
• These ports accept a #4 Flare fitting, nnoott an ORS fitting.
Units with Oil Return Hose
• Remove the Schrader valve from one of the service ports on the splice connector bbeeffoorree attaching oil return hose.
• Attach the oil return hose with #4 Flare fitting onto service port securely.
IImmppoorrttaanntt:: Failure to remove the Schrader valve will cause the oil return system to not function, ruin the
compressor, and void your warranty.
• Unused service port must retain the Schrader valve and cap.
Figure 51. Remove Schrader valve and attach oil return hose.
Units with Jet Cool (Liquid Injection System)
All MAX units are equipped with a liquid injection system that requires a special orifice be installed onto the service
port located on the suction line splice connector.
• Remove Schrader valve from the service port on splice connector and install orifice.
• Attach the liquid injection hose with #4 Flare fitting securely. VVeerriiffyy oonnllyy tthhee lliiqquuiidd iinnjjeeccttiioonn hhoossee iiss aattttaacchheedd ttoo
tthhiiss oorriiffiiccee,, NNOOTT tthhee ooiill rreettuurrnn hhoossee..
IImmppoorrttaanntt:: Failure to remove the Schrader valve will cause the liquid injection system to not function, ruin the
compressor, and void your warranty.
Suction Line Routing and P-Trap Formation
The P-Trap creates an oil trap in the suction line which helps ensure proper compressor lubrication. As refrigerant flows
through the P-Trap it picks up oil and carries it to the compressor ensuring proper compressor lubrication.
IImmppoorrttaanntt:: It is critical that P-Trap is installed in the suction line before the roadside compressor.
1. All hose bends must maintain at least minimum bend radii with no kinks. Refer to (“Minimum Hose Bend
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