General Refrigerant Piping System Information; Refrigerant Safety Standards; Device Connection Limitations - LG LH098HV1 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 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.

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 tables below lists pipe length limits that must be followed in the design of a Single Zone Convertible Mid-Static Ducted refrigerant pipe
system. Refer to the figures for maximum length and elevation of piping.
Figure 23: Typical LH098HV1 and LH128HV1 System Layout.
Max Length = A
Max Elevation = B
Indoor unit
66
A
B
Outdoor unit
Table 12: Single-Zone Convertible Mid-Static Ducted
System Model Name
Pipe Length
(ELF = Equivalent Length of
Pipe)
Elevation
(All Elevation Limitations are
Measured in Actual Feet)
Additional Refrigerant Needed (oz/ft)
REFRIGERANT SAFETY STANDARDS /
DEVICE CONNECTION LIMITATIONS
Unit = Feet
Outdoor unit
66
A
B
Indoor unit
Refrigerant Piping System Limitations.
Longest total equivalent piping
length
Shortest total equivalent
piping length
indoor or outdoor units
No additional refrigerant
If outdoor unit is above indoor unit
If outdoor unit is below indoor unit
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Figure 24: Typical LH188HV1, and LH248HV1 System Layout.
Max Length = A
Max Elevation = B
Indoor unit
164
A
B
Outdoor unit
LH098HV1 LH128HV1
66 feet 66 feet
16.4 16.4
24.9 feet 24.9 feet
49 feet 49 feet
49 feet 49 feet
0.22 0.22
Unit = Feet
Outdoor unit
164
A
B
Indoor unit
LH188HV1 LH248HV1
164 feet 246 feet
16.4 16.4
24.9 feet 24.9 feet
98.4 feet 98.4 feet
98.4 feet 98.4 feet
0.43 0.43
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