LS2538-14X58 – MINISPLIT LINE SET (FLARED, 25FT)

Everwell 25 ft insulated twin tube mini split line set with 1/4″ OD liquid tubing and 5/8″ OD suction tubing. Both lines carry 3/8″ wall insulation, listed by Everwell as insulation Type B. Intended for mini split and ducted split system installations where the two lines are run together. Open To Public HVAC Parts stocks this line set with factory flared ends.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• Length25 ft
• Liquid tube OD1/4"
• Suction tube OD5/8"
• Insulation3/8"
• Insulation typeType B
• ConfigurationTwin tube, both lines insulated and paired
• EndsFlared (per OTP stock; Everwell's catalog table does not list flare condition)

How do I buy a line set for a mini split?

By line diameter and length, not by equipment model number. Look at the two stub-outs on the outdoor unit. Most 9k and 12k heads are 1/4 by 3/8, and larger heads move to 1/4 by 1/2 or 3/8 by 5/8. Measure the run including vertical rise and the bends, and buy a little long rather than a little short. Multi-zone systems size each branch on its own, so measure every run separately.

How tight should the flare nuts be?

Use a torque wrench. Common figures are roughly 13 to 18 ft-lbs on 1/4 inch, 25 to 30 on 3/8, and 36 to 46 on 1/2, but the install manual for your unit is the authority. A flare nut torqued by feel is the single most common leak on a mini split. Loose leaks, and overtightened crushes the flare seat and leaks too, except now you get to cut it off and re-flare.

How do I make a flare that will not leak?

Deburr the cut with the tube pointed down so shavings drop out, because a burr guarantees a leak. Slide the flare nut on before you flare, which everyone forgets exactly once. Use a tool with a depth stop, and for R-410A or A2L work an eccentric cone flaring tool beats a plain screw-down block. A drop of Nylog on the flare face and the threads helps it seat. Then torque it.

What is an anti-blowback adapter for?

Mini split service ports are 5/16 inch, so you need a 5/16 to 1/4 adapter to land a hose. The anti-blowback style has a shut-off built in, so when you break the hose loose you do not take a face full of refrigerant and oil off the depressor pin. Get the 90 degree version when the port sits tight against the cabinet.