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General Refrigerant Piping System Information
Due to our policy of continuous product innovation, some specifications may change without notification.
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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.
REFRIGERANT SAFETY STANDARDS /
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 lim-
its, there will be reliability, performance, noise, and vibration issues.
See the table below for pipe length limits that must be followed in the
design of a Single Zone Art Cool Mirror Wall Mount refrigerant pipe
system. For information on additional refrigerant charge necessary
for longer piping lengths, refer to Table 19 in the “Refrigerant Trim
Charge” section.
Figure 26: Single Zone Art Cool Mirror Wall Mount System Layout.
Outdoor Unit
Indoor Unit
A
B
Outdoor Unit
Indoor Unit
A
B
Table 7: Single Zone Art Cool Mirror Refrigerant Piping System Limitations.
Model Numbers
LA090HSV5
(LAN090HSV5/
LSU090HSV5)
LA120HSV5
(LAN120HSV5/
LSU120HSV5)
LA180HSV5
(LAN180HSV5/
LSU180HSV5)
LA240HSV3
(LAN240HSV3/
LAU240HSV3)
Pipe Sizes
Vapor
Ø3/8
Ø3/8
Ø5/8
Ø5/8
Liquid
Ø1/4
Ø1/4
Ø3/8
Ø3/8
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Standard Piping Length
24.6
24.6
24.6
24.6
Piping Length with No
Additional Refrigerant
41
41
24.6
24.6
Longest total equivalent
piping length
82
82
114.8
98.4
Shortest total equivalent
piping length
9.8
9.8
9.8
9.8
Distance between fittings
and indoor units or
outdoor
units
≥20 inches
≥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
49.2
If outdoor unit is below
indoor unit
49.2
49.2
49.2
49.2
Additional Refrigerant Needed (oz/ft)
0.22
0.22
0.38
0.38
