12
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
Figure 29. Tighten Flare Nut
Table 5. Flare Nut Torque Recommendations
Outside
Diameter
Recommended
Torque
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
Inches
1/4
15 ft.lb. (20 N)
1/4 turn
3/8
26 ft.-lb. (35 N)
1/2 turn
Table 5. Flare Nut Torque Recommendations
Outside
Diameter
Recommended
Torque
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
Inches
1/2
41 ft.-lb. (56 N)
7/8 turn
5/8
48 ft.-lb. (65 N)
1 full turn
IMPORTANT
Do not allow for excess length of line sets to be left
rolled up as part of the required, or in general. This will
also cause additional performance issues.
IMPORTANT
Do not over-tighten a flared joint. Flared connections
should always be accessible and must be insulated to
prevent condensation.
OUTDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
INDOOR UNIT
Maximum Line Set
Length
Maximum Line Set
Length
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Minimum Line Set
Length - 10 ft. (3m)
Minimum Line Set
Length - 10 ft. (3m)
Outside Unit BELOW Indoor Unit
Outside Unit ABOVE Indoor Unit
Figure 30. Indoor and Outdoor Unit Elevation Relationships
Table 6. 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
Length
Liquid
Gas
009
1/4
3/8
33 (10)
33 (10)
82 (25)
For the additional charging,
add 0.16 oz. for 1/4” liquid line
and 0.32 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)
82 (25)
164 (50)
