Refrigerant Piping Work; Flaring; Piping Work - Carrier 42QSS009DS Installationshandbuch

4. REFRIGERANT PIPING WORK

CAUTION
Check if the height difference between indoor unit & outdoor unit and the total length of refrigerant pipe
meet system requirement.
Refrigerant piping work follows the indoor unit and outdoor unit installation, connect the pipe at the indoor
side first, then the outdoor side.
Always keep ends of tubing sealed by placing a cap or covering with tape during installation and do NOT
remove them until you are ready to connect the piping.
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.

4.1 FLARING

NOTE
Tools required for flaring are pipe cutter, reamer,flaring
tool and pipe holder.
For R32 refrigerant models, the pipe connection points
must be placed outside of room.
4.1.1 Using a pipe cutter to cut the pipe to the requested
length. Ensure that the cut edge remains at 90° with
the side of the pipe.
Oblique
90
4.1.2 Use a reamer to remove burrs with the cut surface
downward so that the chips do not enter the pipe.
4.1.3 Carry out flaring work using flaring tools as below.
A(mm)
Outside diameter
Max Min
Φ6.35mm 8.7 8.3
Φ9.52mm 12.4 12.0
Φ12.7mm
15.8 15.4
Φ15.88mm 19.0 18.6
Φ19.05mm 23.3 22.9
4.1.4 Check if the flaring is properly made. See incorrectly
flared pipes sample below.
Damaged
Inclined
Surface
CAUTION
In case of needing brazing, work with Nitrogen gas blowing.
Improper torque will cause flare damage or gas leaks.
GB-15 7
Rough Burr
90 ° ± 4
A
R0.4~0.8
Uneven
Cracked
Thickness

4.2 PIPING WORK

4.2.1 Align the center to tighten the flare nut and
finish connection using two wrenches.
Flare nut
Torque wrench
Wrench
Tubing size
Φ6.35mm
18 ~ 20 N.m
Φ9.52mm
25 ~ 26 N.m
Φ12.7mm
35 ~ 36 N.m
45 ~ 47 N.m
Φ15.88mm
65 ~ 67 N.m
Φ19.05mm
4.2.2 Select the appropriate insulation material for
refrigerant pipe. (Min. 10mm, thermal insulating
foam C)
Use separate thermal insulation pipes for gas &
liquid pipes.
The thickness above is a standard of the indoor
temperature of 27°C and humidity of 80%. If installing
in an unfavorable conditions such as near bath-
rooms, kitchens, and other similar locations,
reinforce the insulation.
Insulation's heat-resistance temperature should be
more than 120°C.
Use the adhesives on the connection part of insula-
tion to prevent moisture from entering.
Repair and cover any possible cracks in the insulation
specially check the bent part or hanger of pipe.
Torque