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General Refrigerant Piping System Information
Due to our policy of continuous product innovation, some speci¿cations may change without noti¿cation.
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Refrigerant Safety Standards
ASHRAE Standards 15-2010 and 34-2010 address refrigerant safety and the maximum allowable concentration of refrigerant in an occupied
space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required to safely dissipate the refrigerant. For R410A
refrigerant, the maximum allowable concentration of refrigerant is 26 lbs./1,000 cubic feet (Addendum L modified the RCL to 26) of occupied
spaces. Buildings with 24-hour occupancy are allowed half of that concentration.
If a single zone system develops a refrigerant leak, the entire refrigerant charge of the system will dump into the area where the leak occurs.
To meet ASHRAE Standards 15 and 34, the smallest room volume on the system must be calculated and compared to the maximum allow-
able concentration. Also consult state and local codes in regards to refrigerant safety.
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DEVICE CONNECTION LIMITATIONS
Device Connection Limitations
A single-zone system consists of one outdoor unit and one indoor
unit. One of the most critical elements of a single-zone system is
the refrigerant piping. If the connection piping is not within allowable
limits, there will be reliability, performance, noise, and vibration
issues. The table below lists pipe length limits that must be followed
in the design of a Single Zone High Efficiency Wall Mount refrigerant
pipe system. Refer to the figure for maximum length and elevation of
piping.
Table 7: Single Zone High Ef¿ciency Refrigerant Piping System Limitations.
Figure 26: Single Zone High Ef¿ciency Wall Mount System Layout.
Model Numbers
LS090HSV5
(LSN090HSV5/
LSU090HSV5)
LS120HSV5
(LSN120HSV5/
LSU120HSV5)
LS180HSV5
(LSN180HSV5/
LSU180HSV5)
Pipe Sizes
Vapor Ø3/8 Ø3/8 Ø5/8
Liquid Ø1/4 Ø1/4 Ø3/8
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Standard Piping Length 24.6 24.6 24.6
Piping Length with No
Additional Refrigerant
41 41 24.6
Longest total equivalent
piping length
82 82 114.8
Shortest total equivalent
piping length
9.8 9.8 9.8
Distance between fittings
and indoor units or
outdoor units
20 inches 20 inches 20 inches
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
If outdoor unit is above
indoor unit
49.2 49.2 49.2
If outdoor unit is below
indoor unit
49.2 49.2 49.2
Additional Refrigerant Needed (oz/ft) 0.22 0.22 0.38
Outdoor Unit
Indoor Unit
A
B
Outdoor Unit
Indoor Unit
A
B
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