Refrigerant Safety; Refrigerant Pipe Specifications; Indoor Unit Piping Connections - LG Multi V Installation Manual

Refrigerant Safety

ASHRAE Standards 15-2010 and 34-2010 offer guidelines that 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 for this to occur safely.
For R410A refrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of an occupied space.
Buildings with twenty-four (24) hour occupancy allow half of that concentration.
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak
occurs. To meet ASHRAE Standards 15 and 34, calculate the refrigerant concentration that may occur in the smallest room volume on the
system, and compare the results to the maximum allowable concentration number.
refrigerant safety.
Information about ASHRAE Standard 15-2010 / 34-2010 and addenda current as of the date of this publication
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Verify the maximum refrigerant concentration level in the space where the indoor unit will be mounted meets the concentration limit for the application.

Refrigerant Pipe Specifications

Use drawn or annealed tempered air conditioning and refrigeration (ACR) copper tubing that meets ASTM B-280 standards. Table 4 lists
pipe sizes for the convertible and ceiling suspended units. Choose tube wall thickness to meet local code, UL, and approved for an operat-
ing pressure of 551 psig. When bending soft copper tubing, use the largest radius bends practical to reduce the equivalent length of installed
pipe. Be sure no traps or sags are present when rolling out soft copper tubing.
Unit
Multi V™ Convertible
Multi V™ Convertible
Multi V™ Ceiling Suspended
Multi V™ Ceiling Suspended
Refrigerant Pipe Supports
A properly installed pipe system has sufficient support so that pipes do not sag during the life of the system (Figure 14). As necessary, place supports
closer for segments where potential sagging could occur. Maximum spacing of pipe supports shall meet local codes.

INDOOR UNIT PIPING CONNECTIONS

Table 4: Pipe Specifi cations
Model Number
ARNU093VEA2
ARNU123VEA2
ARNU183VJA2
ARNU243VJA2
Support Location
B
A
A + B ~ 12" – 19"
Figure 14: Refrigerant Pipe Support Locations
Due to our policy of continuous product innovation, some specifi cations may change without notifi cation.
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Also consult state and local codes in regards to
Pipe Sizes (in, OD)
Liquid Line Vapor Line
1/4 Flare 1/2 Flare
1/4 Flare 1/2 Flare
1/4 Flare 1/2 Flare
3/8 Flare 5/8 Flare
~ 12" – 19"
Condensate Drain
5/8
5/8
5/8
5/8
Max. 12"
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