15
Table 4. Flare Nut Torque Recommendations and Tightening Procedure
Outside
Diameter
Recommended
Torque
No torque wrench available
Finger tighten and use an appropriately sized
wrench to turn an additional:
IMPORTANT
Always use two wrenches when tightening are
nuts to avoid twisting refrigerant piping. DO NOT
over-tighten are nuts.
Inches
1/4 15 ft.-lb. (20 N) 1/4 turn
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
3/8 26 ft.-lb. (35 N) 1/2 turn
1/2 41 ft.-lb. (56 N) 7/8 turn
5/8 48 ft.-lb. (65 N) 1 full turn
Table 5. Refrigerant Line Set Requirements
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
Do not allow for excess length of line sets to be left rolled up as part of the
required distance, or in general. This will also cause additional performance issues.
IMPORTANT
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)
Liquid Gas
009 1/4 3/8 40 (12) 40 (12) 82 (25)
012 1/4 1/2 40 (12) 40 (12) 82 (25)
018 1/4 1/2 66 (20) 66 (20) 98 (30)
024 3/8 5/8 82 (25) 82 (25) 164 (50)
036/048 3/8 5/8 98 (30) 98 (30) 213 (65)
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