Rinnai Pro Series Installation Manual page 19

Avoid direct contact with bare pipes as this may result in burns or frostbite.
WARNING
Step 1: Cut pipes
When preparing refrigerant pipes, take extra care to cut and flare
them properly. This will ensure efficient operation and minimise
the need for future maintenance. Be careful not to damage, dent,
or deform the pipe while cutting. This will drastically reduce the
heating efficiency of the unit.
• Measure the distance between the indoor and outdoor units.
• Using a pipe cutter, cut the pipe a little longer than the measured distance.
• Make sure that the pipe is cut perfectly at a 90° angle.
Step 2: Remove burrs
Burrs affect the airtight seal of the refrigerant piping connection. They must be
Pipe
completely removed. Hold the pipe at a downward angle to prevent burrs from
Reamer
falling into the pipe. Using a reamer or deburring tool, remove all burrs from the
Point
cut section of the pipe.
down
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal. After removing burrs from the cut pipe, seal
the ends with PVC tape to prevent foreign materials from entering the pipe. Sheath the pipe with
insulating material.
Place the flare nuts on both ends of the pipe. Make sure they are facing in the right direction, as
you can't put them on or change direction after flaring.
Remove PVC tape from the ends of the pipe when ready to perform flaring work. Clamp flare form
on the end of the pipe. The end of the pipe must extend beyond the flare form.
Place flaring tool onto the form. Turn the handle of the flaring tool clockwise until the pipe is fully
flared. Flare pipe in accordance with the dimensions below then remove the flaring tool and flare
form, then inspect the end of the pipe for cracks and even flaring.
Flare nut
Copper pipe
Piping extension beyond flare form
Pipe gauge Tightening
torque
Ø 9.52 (Ø⅜ ") 33-42 N.m
Ø12.7 (ؽ ") 50-62 N.m
Ø16 (Ø⅝ ") 63-77 N.m
Ø19 (ؾ ") 90-110 N.m
Flare form
Pipe
Flared dimensions (A)
Min.
13.2 mm
16.2 mm
19.2 mm
23.2 mm
90°
Oblique
Flare shape
Max.
13.5 mm
16.5 mm
19.7 mm
23.7 mm
Rough
Warped
90°±4
B
R0.4~0.8
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