Lennox MLA018S4S-1P User Manual

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19. Start-Up
19.1. Adding Refrigerant - Single-Zone Systems
Theoutdoorunitisfactory-chargedwithrefrigerant.Calculatetheadditionalrefrigerantrequiredaccordingtothediameter
andthelengthoftheliquidpipebetweentheoutdoorunitandindoorunitconnections.
Besuretoaddtheproperamountofadditionalrefrigerant.Failuretodosomayresultinreducedperformance.
NOTE: Interconnecting pipe work between outdoor and indoor units must be 10 ft. or longer.
NOTE: Do not remove refrigerant for line lengths less than 25 ft. R-410A is a blended refrigerant. If you must remove
charge, it is necessary to remove the entire charge and weigh in the new charge.
Table 1. Adding Refrigerant
System Size (KBtu)
Pipe Length Amount of Refrigerant to add
09 >25 ft. (7.5m) 0.161oz/ft(15g/m)
12 >25 ft. (7.5m) 0.161oz/ft(15g/m)
18 >25 ft. (7.5m) 0.161oz/ft(15g/m)
24 >25 ft. (7.5m) 0.322oz/ft(30g/m)
36 >25 ft. (7.5m) 0.322oz/ft(30g/m)
48 >25 ft. (7.5m) 0.322oz/ft(30g/m)
19.2. Adding Refrigerant - Multi-Zone Systems
Theoutdoorunitisfactory-chargedwithrefrigerant.Calculatetheadditionalrefrigerantrequiredaccordingtothelengthof
theliquidpipe(oneway)betweentheoutdoorunitandindoorunitconnections.
Besuretoaddtheproperamountofadditionalrefrigerant.Failuretodosomayresultinreducedperformance.
NOTE: Interconnecting pipe work between outdoor and indoor units must be 10 ft. or longer.
NOTE: Do not remove refrigerant for line lengths less than 25 ft. R-410A is a blended refrigerant. If you must remove
charge, it is necessary to remove the entire charge and weigh in the new charge.
Table 2. Adding Refrigerant
System
Pre-charge
Pipe Length
Amount of Refrigerant to add
Two-port 50 ft. (15 m)
0.16oz((L1ft+L2ft)-50ft)
0.005kg((L1m+L2m)-15m)
Three-port 75 ft. (23 m)
0.16oz((L1ft+L2ft+L3ft)-75ft)
0.005kg((L1m+L2m+L3m)-23m)
Four-port 100 ft. (30 m)
0.16oz((L1ft+L2ft+L3ft+L4ft)-100ft)
0.005kg((L1m+L2m+L3m+L4m)-30m)
Five-port 125 ft. (38 m)
0.16oz((L1ft+L2ft+L3ft+L4ft+L5ft)-125ft)
0.005kg((L1m+L2m+L3m+L4m+L5m)-38m)

Lennox MLA018S4S-1P Specifications

General

Brand	Lennox
Model	MLA018S4S-1P
Category	Air Conditioner
Language	English