Section 5. Refrigerant Line Considerations - Trane 4TWB3018D Installer's Manual

Section 5. Refrigerant Line Considerations

5.1 Refrigerant Line and Service Valve Connection Sizes
5.2 Factory Charge
Outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit,
fifteen (15) feet of tested connecting line, and the smallest indoor evaporative coil match. If connecting line
length exceeds fifteen (15) feet and/or a larger indoor evaporative coil is installed, then final refrigerant
charge adjustment is necessary.
5.3 Required Refrigerant Line Length
Determine required line length and lift. You will
need this later in STEP 2 of Section 14.
Total Line Length = __________ Ft.
Total Vertical Change (lift) = __________ Ft.
5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be
insulated. DO NOT allow the Liquid Line and
Vapor Line to come in direct (metal to metal)
contact.
6
Line Sizes
Vapor
Model
Line
4TWB3018D 5/8
4TWB3024D 5/8
4TWB3030C 3/4
4TWB3036C 3/4
4TWB3042B 3/4
4TWB3048B 7/8
4TWB3060B 7/8
Table 5.1
Service Valve Connection Sizes
Liquid Vapor Line
Line Connection
3/8 5/8
3/8 5/8
3/8 3/4
3/8 3/4
3/8 3/4
3/8 7/8
3/8 7/8
Liquid Line
Liquid Line
Connection
3/8
3/8
3/8
3/8
3/8
3/8
3/8
Line Length
Vapor Line
Insulation
18-BC85D1-2