LG LV120HCV - Refrigerant Safety Standards; Device Connection Limitations

INTRODUCTION | 25
General Refrigerant Piping System Information
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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 the 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 allowable concentration. Also consult state
and local codes in regards to refrigerant safety.
REFRIGERANT SAFETY STANDARDS /
DEVICE CONNECTION LIMITATIONS
Connection Limitations
Single zone systems consist of one outdoor unit and one indoor unit. One of the most critical elements of
a single zone system is the refrigerant piping. Table 6 lists the pipe length limits that must be followed in
the design of a Single Zone VAHU refrigerant pipe system.
Figure 29: LV120HCV, LV180HCV, LV240HCV, LV300HCV System Layout
Table 6: Single Zone VAHU Refrigerant Piping System Limitations
Outdoor Unit
Typical Indoor Unit
A
B
Outdoor Unit
Typical Indoor Unit
A
B
Unit = Feet
Max. Length = A
Max. Elevation = B
164 164
98 98
System Model Name
LVU120HCV LVU180HCV, LVU240HCV, LVU300HCV
Pipe Length
(ELF = Equivalent
Length of Pipe in Feet)
Longest total equivalent piping length
98.4 feet 164 feet
Shortest total equivalent piping length
16.4 feet 16.4 feet
Distance between fittings and indoor
or
outdoor units
≥20 inches ≥20 inches
No additional refrigerant
24.6 feet 24.6 feet
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
If outdoor unit is above indoor unit
66 feet 98 feet
If outdoor unit is below indoor unit
66 feet 98 feet
Additional Refrigerant Needed (oz/ft)
0.21 0.43