18-AC126D1-1A-EN
9
Refrigerant Line Considerations
Table 7. Refrigerant Line and Service Valve Connection Sizes
Rated Line Sizes Service Valve Connection Sizes
Model
Vapor Line Liquid Line Vapor Line Connection Liquid Line Connection
4TTL5024N1
3/4 3/8 3/4 3/8
4TTL5030N1
3/4 3/8 3/4 3/8
4TTL5036N1
7/8 3/8 7/8 3/8
4TTL5042N1
7/8 3/8 7/8 3/8
4TTL5048N1
7/8 3/8 7/8 3/8
Table 8. Factory Charge
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested
connecting line, and the smallest rated indoor evaporative coil match. Always verify proper system charge via subcooling (TXV/EEV) or
superheat (fixed orifice) per the unit nameplate.
Table 9. Required Refrigerant Line Length
Determine required line length and lift. You will need this to
determine the subcooling charging corrections later in the
installation process.
Total Line Length = ___________________________Ft.
Total Vertical Change (lift) = ____________________Ft.
Table 10. 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.
Note: The gas line must always be insulated. Insulating the liquid
line through attic spaces may benefit system performance by
minimizing heat gain in the liquid line.
Liquid Line
Vapor Line
Insulation
UUnniitt LLooccaattiioonn CCoonnssiiddeerraattiioonnss
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