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TORQUE WRENCH
TO INDOOR
UNIT
Figure 29. Tighten Flare Nut
Table 5. Flare Nut Torque Recommendations
Outside
Recommended
Diameter
Torque
Inches
1/4
15 ft.lb. (20 N)
3/8
26 ft.-lb. (35 N)
INDOOR UNIT
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Outside Unit BELOW Indoor Unit
Line Set Diameters (in.)
System
Size (KBtu)
Liquid
009
1/4
012
1/4
018
1/4
024
3/8
BACKUP
WRENCH
TO OUTDOOR UNIT
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
1/4 turn
1/2 turn
Maximum Line Set
Length
OUTDOOR UNIT
Minimum Line Set
Length - 10 ft. (3m)
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.
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit - Feet
Gas
(Meter)
3/8
33 (10)
1/2
33 (10)
1/2
66 (20)
5/8
66 (20)
Table 5. Flare Nut Torque Recommendations
Outside
Recommended
Diameter
Torque
Inches
1/2
41 ft.-lb. (56 N)
5/8
48 ft.-lb. (65 N)
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.
Maximum Line Set
Length
INDOOR UNIT
Outside Unit ABOVE Indoor Unit
Maximum
Elevation
Maximum Line
Outdoor Unit
Set Length -
ABOVE Indoor
Feet (Meters)
Unit - Feet (Meter)
33 (10)
82 (25)
33 (10)
82 (25)
66 (20)
98 (30)
82 (25)
164 (50)
12
No torque wrench available
Finger tighten and use an
appropriately sized wrench to
turn an additional:
7/8 turn
1 full turn
Minimum Line Set
Length - 10 ft. (3m)
OUTDOOR UNIT
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Additional Refrigerant for
greater than 25 Foot Line Set
Length
For the additional charging,
add 0.16 oz. for 1/4" liquid line
and 0.32 oz. for 3/8" liquid line
per foot.
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