LG LV240HV4 - Refrigerant Safety Standards; Device Connection Limitations; Refrigerant Safety Standards; Connection Limitations

INTRODUCTION | 27
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 31: LV180HV4, LV240HV4 System Layout
Table 6: Single Zone VAHU Refrigerant Piping System Limitations
System Model Name LV180HV4, LV240HV4 LV360HV4, LV420HV, LV480HV
Pipe Length
(ELF = Equivalent Length of
pipe in Feet)
Longest total equivalent piping length 164 feet 246 feet
Shortest total equivalent piping length 6.6 feet 6.6 feet
Distance between fittings and indoor or
outdoor unit
≥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 98 feet 98 feet
If outdoor unit is below indoor unit 98 feet 98 feet
Additional Refrigerant Needed (oz/ft) 0.43 0.43
Figure 32: LV360HV4, LV420HV, LV480HV System Layout
Outdoor Unit
Indoor Unit
A
B
Outdoor Unit
Indoor Unit
A
B
Unit = Feet
Max. Length = A
Max. Elevation = B
164 164
98 98
Outdoor Unit
Indoor Unit
A
B
Outdoor Unit
Indoor Unit
A
B
Unit = Feet
Max. Length = A
Max. Elevation = B
246
246
98 98