YMGI • Your Modern Green Idea
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
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CONNECT REFRIGERANT PIPES BETWEEN THE INDOOR AND OUTDOOR UNITS
First, connect the copper tubes at indoor unit. Bend the pipes accordingly using pipe bending tools. Do NOT hand bend
pipes, as this could create a kink in a line. Extra length is required for future service.
REFRIGERANT PIPES
For a distance other than 25' between indoor and horizontal venting condensing units, refer to the following table for
copper sizes.
Refrigerant Valve and Pipe Size/Length
Btu/h
Valve Size
Line Sizes at Different Lengths
Liquid Gas
15
– 30 ft.
31
– 75 ft.
12K
1/4”, 3/8”
1/4”, 3/8”
1/4”, 1/2”
18K
1/4”, 1/2”
1/4”, 1/2”
1/4”, 5/8”
24K
1/4”, 5/8”
1/4”, 5/8”
3/8”, 5/8”
Running Interconnecting Refrigerant Lines:
Use clean refrigeration grade copper pipe only. Keep the copper lines from kinking and transmitting any noise to walls,
cabinets, etc. Pipe length not to exceed 150 feet, elevation not to exceed 35 feet. Insulate both the liquid and gas copper
lines with at least 3/8-inch-thick insulation tubes. Band, tape and secure the refrigerant lines. Support copper lines at a
proper distance apart to keep the tubes from sagging.
CUT REFRIGERANT PIPE
Make sure where the pipe is to be cut is straight and smooth.
Engage the cutting blade. The cutting blade must be straight
and perpendicular to the pipe surface. Don't cut too fast or
apply too much pressure. Turn and tighten the tube cutter
slowly. Remove residual and de-bur the cut edge. The cut edge
should be smooth and clean.
CONNECT REFRIGERANT PIPES:
Connect Copper Pipes-Flare/Nut Connection at both Indoor
and Outdoor Units
Proper torque shall be applied to create a good connection at
the female nut, flare and male nut, as recommended in the
following table. Too much torque may damage and break the
flare/nut seal. Too little torque may not ensure a good seal.
ALWAYS use a pair of wrenches when tightening.
