Refrigerant Piping Connection - Rinnai Pro Series Installation Manual

Refrigerant piping connection

Avoid direct contact with bare pipes as this may result in burns or frostbite.
WARNING
When connecting refrigerant piping do not let substances or gases other than the specified
refrigerant enter the unit. The presence of other gases or substances will lower the unit's capacity,
and can cause abnormally high pressure in the refrigeration cycle. This could cause an explosion.
The branching pipe must be installed horizontally. An angle of more than 10° may cause
malfunction. Insulate the gas and liquid piping to prevent condensation.
DO NOT install the connecting pipe until both the indoor and outdoor units have been installed.
Pipe length
Ensure the length of the refrigerant pipe, the number of bends, and the drop height between the
indoor and outdoor units meets the requirements shown on the specification summary page.
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 completely
removed. Hold the pipe at a downward angle to prevent burrs from falling into the pipe. Using a
reamer or deburring tool, remove all burrs from the cut section of the pipe.
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 in the table on the next page, then remove
the flaring tool and flare form. Inspect the end of the pipe for cracks and even flaring.
90°
Rough
Oblique Warped
Point
down
Pipe
Flare nut
Reamer
Copper pipe
Flare form
Pipe
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