Refrigerant Piping Connection - Rinnai Pro Series Installation Manual

Refrigerant piping connection

When connecting refrigerant piping do not let substances or other 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.
WARNING
This can cause explosion and injury.
The length of refrigerant piping will affect the performance and energy efficiency of the unit.
Nominal efficiency is tested on units with a pipe length of 5 m—a minimum pipe run of 3 m is
required to minimise vibration and excessive noise.
1.
Cut pipes
Be careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce
the heating efficiency of the unit. 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 and repair.
1. Measure the distance between the indoor and outdoor units.
2. Using a pipe cutter, cut the pipe a little longer than the measured distance.
3. Make sure that the pipe is cut at a perfect 90° angle.
90°
Oblique
2.
Remove burrs
Burrs can affect the airtight seal of the refrigerant pipe connection, they must be completely
removed.
1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
2. Using a deburring tool, remove all burrs from the cut section of the pipe.
3.
Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from the 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 flare nuts on both ends of the pipe. Make sure they are facing in the right direction.
You can't put them on or change their direction after flaring.
4. Remove PVC tape from ends of pipe when ready to perform flaring work.
5. Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the edge
of the flare form in accordance with the dimensions below.
Outer diam. of pipe (mm)
Ø 6.35 (Ø 0.25 ")
Ø 9.52 (Ø 0.375 ")
Ø 12.7 (Ø 0.5 ")
Ø 16 (Ø 0.63 ")
Ø 19 (Ø 0.75 ")
Rough
Warped
Minimum
0.7 (0.0275 ")
1.0 (0.04 ")
1.0 (0.04 ")
2.0 (0.078 ")
2.0 (0.078 ")
A (mm)
Maximum
1.3 (0.05 ")
1.6 (0.063 ")
1.8 (0.07 ")
2.2 (0.086 ")
2.4 (0.094 ")
A
Pipe
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