18-AC78D1-6 3
When mounting the outdoor unit on a roof, be
sure the roof will support the unit’s weight.
Properly selected isolation is recommended to
prevent sound or vibration transmission to the
building structure.
• Maximum line length = 100 feet.
• Maximum vertical length = 60 feet.
• Compressor crankcase heat is required for line
lengths over 60 feet.
• Use only the line diameters indicated in Table
5.1.
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
2.2 Refrigerant Piping Limits
Unit Dimensions and Weight
Models H x D x W Weight*
4TTM3018-036 28-7/8 x 23-1/2 x 25-1/2 154
4TTM3042-060 28-7/8 x 28-1/2 x 29-1/4 168
* Weight values are estimated.
Standard Line
Set 100’ Max
60’ Max
Line Lift
60’ Max
Line Lift
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