Lennox MHA018S4S-1P - Outdoor Unit Connections; 9.1. Pipe Length and Torque Requirements

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Table 4. Line Set Guide
Eachsystemsizehasalinesetlengthandverticalelevationparameters.
System
Size (KBtu)
Line Set Diameters (in.)
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit - Feet
(Meter)
Maximum
Elevation
Outdoor Unit
ABOVE Indoor
Unit - Feet (Meter)
Maximum Line
Set Length -
Feet (Meters)
Additional Refrigerant for greater
than 25 Foot Line Set Lenght
Liquid Gas
009 1/4 3/8 33(10) 33(10) 82(25)
Fortheadditionalcharging,we
recommend0.161oz.for1/4”liquid
lineand0.322oz.for3/8”liquidline
perfoot.
012 1/4 1/2 33(10) 33(10) 82(25)
018 1/4 1/2 66(20) 66(20) 98(30)
024 3/8 5/8 66(20) 66(20) 98(30)
9. Outdoor Unit Connections and Line Set
Usage
Description
Catalog
No.
Size
09 12 18 24
OUTDOOR UNIT
LineSets 1/4in.x3/8in.x25ft. 90X53 • N/A
1/4in.x3/8in.x50ft. X0258 • N/A
1/4in.x1/2in.x25ft. 90X52 N/A • • N/A
1/4in.x1/2in.x50ft. X0259 N/A • • N/A
3/8in.x5/8in.x25ft. X8406 N/A •
3/8in.x5/8in.x50ft. X8407 N/A •
9.1. Pipe Length
Maximumpipinglengthandheightdifference.
Table 5. Pipe Diameter - MM (Inches)
Indoor Unit
Extension Pipe Diameter (mm/inches)
Model Pipe Diameter (mm/inches)
9K
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 9.52(3/8) Gas 9.52(3/8)
12Kand18K
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 12.7(1/2) Gas 12.7(1/2)
24K
Liquid 9.52(3/8) Liquid 9.52(3/8)
Gas 15.9(5/8) Gas 15.9(5/8)
9.2. Torque Requirements
CAUTION
Refrigerantpipediameterisdifferentaccordingtoindoorunittobeconnected.Whenusingtheextensionpipe,referto
thetablesbelow.
Whenrefrigerantpipediameterisdifferentfromthatoftheoutdoorunitconnector(18Kindoorunit)anadditionaladapter
isrequired.
Table 6. Torque
Outside Diameter Torque Additional Tightening
MM Inches v.cm N.cm
Ф6.35 1/4 1500(153kgf.cm) 1600(163kgf.cm)
Ф9.52 3/8 2500(255kgf.cm 2600(265kgf.cm)
Ф12.7 1/2 3500(357kgf.cm) 3600(367kgf.cm)