6 18-BC85D1-2
Line Sizes Service Valve Connection Sizes
Model
Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
4TWB3018D 5/8 3/8 5/8 3/8
4TWB3024D 5/8 3/8 5/8 3/8
4TWB3030C 3/4 3/8 3/4 3/8
4TWB3036C 3/4 3/8 3/4 3/8
4TWB3042B 3/4 3/8 3/4 3/8
4TWB3048B 7/8 3/8 7/8 3/8
4TWB3060B 7/8 3/8 7/8 3/8
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
5.3 Required Refrigerant Line Length
5.2 Factory Charge
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.
Vapor Line
Liquid Line
Insulation
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.
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.
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