Addition Of Refrigerant Per Pipe Length; Connecting The Refrigerant Piping - SOLAR AC DC DLMDWA1-ACDC-18K Installation Manual

Addition of refrigerant per pipe length

Pipe length more than 5 meters requires the addition of refrigerant.

Connecting the Refrigerant piping

The indoor unit contains an inert gas. Use caution when loosening the flared fittings
to vent the gas.
Cut the piping to length. Take care that no foreign matter enters the piping. Slide the flare
nuts onto the piping. Flare the piping using a flaring tool for refrigerant piping.
Inspect the flares checking that they are even and do not have any cracks or burrs.
Flaring Torque specifications
Pipe size Torque
6mm / ¼ inch 15-18 Nm
9 mm / 3/8 inch 32-39 Nm
12 mm / ½ inch 49-59 Nm
15 mm / 5/8 62-76 Nm
inch
19 mm / ¾ inch 67-101 Nm
Remove the protective caps from the valves.
Align flared pipe ends with the valves and hand tighten.
Use a spanner to support the valve. (see illustration below)
While supporting the body of the valve use a torque wrench
to tighten the nuts.
Repeat for the indoor unit connections.
Revision 25 July 2021
Flared width (A) Flaring shape
8.3 /8.7 mm
12.0 / 12.4 mm
15.4 / 15.8 mm
18.6 / 19.0 mm
22.9 / 23.3 mm
Apply refrigerant
oil or sealant
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