Refrigerant Piping Work; Flaring; Piping Work - Carrier 42QZL018RS Serie 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
Φ6.35mm
8.7
Φ9.52mm
12.4
Φ12.7mm
15.8
Φ15.88mm
19.0
Φ19.05mm
23.3
4.1.4 Check if the flaring is properly made. See incorrectly
flared pipes sample below.
Inclined Damaged Surface
CAUTION
In case of needing brazing, work with Nitrogen gas blowing.
Improper torque will cause flare damage or gas leaks.
Rough Burr
Min
90 ° ± 4
8.3
A
12.0
15.4
R0.4~0.8
18.6
22.9
Cracked Uneven Thickness

4.2 PIPING WORK

4.2.1 Align the center to tighten the flare nut and
finish connection using two wrenches.
Flare nut
Wrench
Torque wrench
Tubing size
Φ6.35mm
Φ9.52mm
Φ12.7mm
Φ15.88mm
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 bathrooms, 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 insula-
tion specially check the bent part or hanger of
Torque
18 ~ 20 N.m
25 ~ 26 N.m
35 ~ 36 N.m
45 ~ 47 N.m
65 ~ 67 N.m
GB-13 7