Refrigerant Safety/Device Connection Limitations - LG LV181HV4 Installation Manual

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.
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 31: LV181HV4, LV241HV4 System Layout
Indoor Unit
Unit = Feet
Max. Length = A
Max. Elevation = B
164
A
B
98
Outdoor Unit
Table 6: Single Zone VAHU Refrigerant Piping System Limitations
System Model Name
Pipe Length
(ELF = Equivalent Length of
pipe in Feet)
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
Additional Refrigerant Needed (oz/ft)
REFRIGERANT SAFETY STANDARDS /
DEVICE CONNECTION LIMITATIONS
Outdoor Unit
164
A
B 98
Indoor Unit
Longest total equivalent piping length
Shortest total equivalent piping length
Distance between fittings and indoor or
outdoor unit
No additional refrigerant
If outdoor unit is above indoor unit
If outdoor unit is below indoor unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 32: LV361HV4, LV420HV, LV480HV System Layout
Indoor Unit
Unit = Feet
Max. Length = A
Max. Elevation = B
246
A
B
98
Outdoor Unit
LV181HV4, LV241HV4
164 feet
6.6 feet
≥20 inches
24.6 feet
98 feet
98 feet
0.43
Outdoor Unit
246
A
B
98
Indoor Unit
LV361HV4, LV420HV, LV480HV
246 feet
6.6 feet
≥20 inches
24.6 feet
98 feet
98 feet
0.43
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