Lennox MS8 SERIES Installation And Service Procedures page 21

REFRIGERANT LINE SET REQUIREMENTS, LENGTH AND HEIGHT LIMITATIONS AND OUTDOOR UNIT
REFRIGERANT METERING DEVICE TYPE (AIR CONDITIONER AND HEAT PUMP SYSTEMS)
System
Line Set Diameters
Size
Small Line
(kBtu)
-09
1/4 in. (6 mm)
-12
-18 1/4 in. (6 mm)
-24 1/4 in. (6 mm)
-30 1/4 in. (6 mm)
Note - Minimum line set length for all sizes is 10 feet (3 meters).
INDOOR UNIT
Maximum Line
Set Elevation
Outside Diameter Recommended Torque
Inches mm U.S.
1/4" 6.35 15 ft.- lb.
3/8" 9.52 26 ft.- lb.
1/2" 12.70 41 ft.- lb.
5/8" 15.88 48 ft.- Ib.
Large Line
3/8 in. (9.5 mm)
1/2 in. (12 mm)
5/8 in. (16 mm)
5/8 in. 16 mm)
LINE SET LENGTH AND ELEVATION
Maximum Line Set Length
OUTDOOR UNIT
TORQUE SPECIFICATIONS
Metric (Newton
Meter)
20
35
55
65
TABLE 9
Maximum Line Set
Elevation
33 feet (10 m)
49 feet (15 m)
33 feet (10 m)
Maximum Line Set
INDOOR UNIT
FIGURE 35
TABLE 10
No torque wrench available
Finger tighten and
appropriately sized wrench to turn an
additional:
Page 21
Maximum Line Set
Length
66 Feet (20 m)
98 Feet (30 m)
98 Feet (30 m)
OUTDOOR UNIT
Length
Maximum Line
Set Elevation
11 12
10
use an
9
8
7
1/4 turn
1/2 turn
7/8 turn
1 full turn
Refrigerant
Metering Device
Type
Electronic Expansion
Valve
1
2
3
1/4 TURN
4
5
6
Corp. 1244-L9