LineSetCalc™ - Split System AC&HP LineSet Calculator Updated 11/12/15 Provide inputs in the blue boxes, and move sliders.

Refrigerant Compressor Factory pre-charge
Liquid Vapor
Charge Adjust TEL
Indoor Coil
Liquid Line
Heat Pump 
Horizontal Length
Vertical Height
A tight bend or LR 90°
fitting in the vapor line
is assumed to also be in
the liquid line.
Use of a Tubing Bender
is the preferred method
Pairs of tight
bends or 90°s
Use low stage capacity
for 2 stage systems.
Capacity at design
conditions is preferred.
Minimum operation
capacity kBtu/h
  Liquid line Calculations   Vapor line Calculations  
Line Equivalent Friction
Temperature Velocity
Line Equivalent Friction Temperature Velocity
Size Length (ft) Loss (psi) drop (F) (fpm)
  Size Length (ft) Loss (psi) drop (F)   (fpm)   (oz)    
  For new installations and equipment change outs, lineset sizing is critical for full capacity, efficient operation and long lasting compessor performance. This is especially important when indoor and outdoor units are separated by a long distance or height. Start Kits and non-bleed (hard shut-off) TXVs or Liquid Line Shutoff Solenoids can prevent problems associated with this. Accessories like Crankcase Heaters are absolutely necessary. It is no wonder that manufacturers who include these as standard, have a reputation for quality.  
Adjustable Parameters Min
Liquid Velocity
  Maximum Vapor Line Temperature Drop (from friction loss) °F
Maximum Liquid Line Temp. Drop (from friction loss) °F
R-22 Maximum Total Effective Length without "Long Line" protection ft
 Minimum Riser Vapor Velocity fpm
R-410a Maximum Total Effective Length without "Long Line" protection ft
   Minimum Horizontal Vapor Velocity fpm        Maximum Total Effective Length with "Long Line" protection ft    
                                Maximum Vertical Separation Compressor Below ft    
                                Maximum Vertical Separation Compressor Above ft    
  The information contained in this calculator represents the opinions and suggestions of Efficient Comfort and the application of the equipment and system suggestions by Efficient Comfort are suggestions and guidelines only. Efficient Comfort does not assume responsibility for the performance of any system as a result of these suggestions. The systems engineer is responsible for the system design and performance.  
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