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TK 55676-19-IM-EN
A/C Hose Installation
Installation Procedures
NNoottee:: See “Refrigerant Hose and Fittings Standards“ in Section 8 of the Thermo King TriPac Installation Standards
Guide (TK 56498). THESE STANDARDS MUST BE FOLLOWED!
Special Tools Required
Hose Fitting Tools (204-1045)
Hose Cutting Tool (204-677)
PAG Refrigerant Oil (2030502)
Torque Wrench
TTiigghhtteenn aallll ffiittttiinnggss aass ssppeecciiffiieedd iinn tthhee cchhaarrtt..
NNoottee:: Always use two wrenches while tightening refrigeration fittings.
Fitting Size Torque Specifications
#6 (3/8'') 11-13 lb-ft (15-17 N•m)
#8 (1/2'') 15-20 lb-ft (20-27 N•m)
#10 (5/8'') 21-27 lb-ft (28-37 N•m)
#12 (3/4'') 28-33 lb-ft (38-45 N•m)
Compressor Hose Connections
IImmppoorrttaanntt:: The suction and discharge hoses must be secured to the support bracket with the pre-installed bandwraps
exactly as shown in the illustration.
1. Begin refrigeration hose installation at the APU compressor fittings. Work away from the compressor towards the
other A/C system components to avoid hose slack inside the APU.
2. Start at the rear of the APU and route the #8 hose into the APU through the upper access hole and the #10 hose
through the lower access hole making sure you route them through the pre-installed bandwraps attached to the
support bracket and then to the compressor.
NNoottee:: Recommend routing the #8 hose first.
a. Cut the suction hose to the appropriate length, attach a ##1100,, 4455 ddeeggrreeee ffiittttiinngg ((wwiitthh sseerrvviiccee ppoorrtt)) and loosely
connect to the ssuuccttiioonn fitting on the compressor.
b. Cut the discharge hose to the appropriate length, attach a ##88,, 4455 ddeeggrreeee ffiittttiinngg ((wwiitthh sseerrvviiccee ppoorrtt)) and loosely
connect to the ddiisscchhaarrggee fitting on the compressor.
3. Gently pull the hoses towards the outside of the APU to remove slack.
a. Rotate compressor fittings as necessary to allow hoses to clear components and engine. Keep both hoses away
from fuel strainer, fuel fittings and bracket.
b. Position both hoses to the support bracket exactly as shown in the illustration and then tighten bandwraps
securely Cut off excess bandwrap length.
4. Tighten all refrigeration fittings as specified in the chart.
5. Re-torque pre-filter bowl to 25 in-lb (2.8 N•m) if it was loosened during the install. Use of tool 204-3103 is
recommended.
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