Refrigerant Piping Work; Flaring; Piping Work - Carrier SensatION 42QHB07D8S Installationsanleitung

4. REFRIGERANT PIPING WORK

CAUTION
C
heck if the height difference between indoor unit & outdoor unit and the total length of refrigerant pipe meet
system requirement.
R
efrigerant piping work follows the indoor unit and outdoor unit installation, connect the pipe at the indoor side
first, then the outdoor side.
A
lways 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.
B
e 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.
When the outdoor unit is the top position and the difference of level is over 10m, it is recommended that set
a oil return bend every 5~8m in the gas pipe. The radius of oil reture bend should be over than 10cm.

4.1 FLARING

NOTE
Tools required for flaring are pipe cutter, reamer,
flaring tool and pipe holder.
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.
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.
Outside diameter
Φ6.35mm
Φ9.52mm
Φ12.7mm
Φ15.88mm
Φ19.05mm
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.
11
Oblique Rough Burr
A(mm)
90 ° ± 4
Max
Min
8.7 8.3
A
12.4 12.0
15.8 15.4
19.0 18.6
23.3 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.
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
R0.4~0.8
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
insulation to prevent moisture from entering.
Repair and cover any possible cracks in the
insulation, specially check the bent part or hanger
of pipe.
Flare nut
Torque wrench
Torque
18 ~ 20 N.m
25 ~ 26 N.m
35 ~ 36 N.m
45 ~ 47 N.m
65 ~ 67 N.m