Outdoor Unit Connections And Line Set Usage; Pipe Length; Torque Requirements - Lennox MCA Series Service Manual

Line Set Diameters (in.)
System
Size (KBtu)
Liquid
009 1/4
012 1/4
018 1/4
024 3/8

10. Outdoor Unit Connections and Line Set Usage

Description
Line Sets

10.1. Pipe Length

Maximum piping length and height difference.
Model
9K
12K and 18K
24K

10.2. Torque Requirements

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.
Outside Diameter
MM
Ф6.35
Ф9.52
Ф12.7
Table 4.
Each system size has a line set length and vertical elevation parameters.
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit - Feet
Gas
(Meter)
3/8 82 (25)
1/2 82 (25)
1/2 98 (30)
5/8 98 (30)
Table 5. Pipe Diameter - MM (Inches)
Indoor Unit
Pipe Diameter (mm/inches)
Liquid
Gas
Liquid
Gas
Liquid
Gas
CAUTION
Table 6.
Inches
1/4
3/8
1/2
Line Set Guide
Maximum
Elevation Maximum Line
Outdoor Unit Set Length -
ABOVE Indoor Feet (Meters)
Unit - Feet (Meter)
33 (10)
33 (10)
66 (20)
66 (20)
Catalog
No.
OUTDOOR UNIT
1/4 in. x 3/8 in. x 25 ft. 90X53
1/4 in. x 3/8 in. x 50 ft. X0258
1/4 in. x 1/2 in. x 25 ft. 90X52
1/4 in. x 1/2 in. x 50 ft. X0259
3/8 in. x 5/8 in. x 25 ft. X8406
3/8 in. x 5/8 in. x 50 ft. X8407
6.35 (1/4)
9.52 (3/8)
6.35 (1/4)
12.7 (1/2)
9.52 (3/8)
15.9 (5/8)
Torque
Torque
v.cm
1500 (153kgf.cm)
2500 (255kgf.cm
3500 (357kgf.cm)
23
Additional Refrigerant for greater
than 20 Foot Line Set Length
82 (25)
For the additional charging, we
82 (25)
recommend 0.161 oz. for 1/4" liquid
line and 0.322 oz. for 3/8" liquid line
98 (30)
per foot.
98 (30)
Size
09 12
•
•
N/A •
N/A •
N/A
N/A
Extension Pipe Diameter (mm/inches)
Liquid
Gas
Liquid
Gas
Liquid
Gas
Additional Tightening
1600 (163kgf.cm)
2600 (265kgf.cm)
3600 (367kgf.cm)
18 24
N/A
N/A
• N/A
• N/A
•
•
6.35 (1/4)
9.52 (3/8)
6.35 (1/4)
12.7 (1/2)
9.52 (3/8)
15.9 (5/8)
N.cm