Multizone Outdoor Unit Installation Manual
Revised 5/14/2020
Refrigerant Piping
Connection
Page 12
Table 7.1: Torque chart and aring guide
Pipe
Reamer
Point down
Fig 7.2
Fig 7.5
Step 3: Flare pipe ends.
Proper aring is essential to achieve an airtight
seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place are nuts on both ends of pipe. Make
sure they are facing in the right direction,
because you can’t put them on or change
their direction after aring. See Fig. 7.3.
4. Remove PVC tape from ends of pipe when
ready to perform aring work.
5. Clamp are form on the end of the pipe. The
end of the pipe must extend beyond the are
form.
6. Place aring tool onto the form.
7. Turn the handle of the aring tool clockwise
until the pipe is fully ared. Flare the pipe in
accordance with the dimensions shown in
table 7.1.
Step 4: Connect pipes.
Connect the copper pipes to the indoor unit rst,
then connect it to the outdoor unit. You should
rst connect the low-pressure pipe, then the
high-pressure pipe.
1. When connecting the are nuts, apply a thin
coat of refrigeration oil or approved refrigerant
sealant to the ared ends of the pipes.
2. Align the center of the two pipes that you will
connect.
3. Tighten the are nut as tightly as possible by
hand.
4. Using a spanner, grip the nut on the unit
tubing.
5. While rmly gripping the nut, use a torque
wrench to tighten the are nut according to
the torque values in Torque Requirements
below. Tighten once, loosen slightly, then
tighten again.
8. Remove the aring tool and are form, then
inspect the end of the pipe for cracks and
even aring.
Fig 7.3
Flare nut
Copper pipe
Fig 7.4
Flare for
m
Pipe
Pipe
gauge
Flaring
torque
Flare dimension
(A) (Unit: Inch)
Flare shape
Min. Max.
1/4" 14 ft/ lbs 0.33 0.34
3/8" 18 ft/ lbs 0.52 0.53
1/2" 26 ft/ lbs 0.64 0.65
5/8" 34 ft/ lbs 0.76 0.78
R0.4~0.8
45
°
±
2
90
°
±
4
A
Fig 7.6
Indoor unit tubing
Flare nut
Pipe