Rinnai Pro Series Installation Manual page 20

Step 4: Connect pipes
Connect the copper pipes to the indoor unit first, then connect to the outdoor unit. Connect the low
pressure pipe, then the high pressure pipe.
When connecting the flare nuts, apply a thin coat of compatible refrigeration oil to the flared ends
of the pipes. Align the centre of the two pipes that will be connected. Tighten the flare nut as tightly
as possible by hand. Using a spanner, grip the nut and use a torque wrench to tighten the flare nut
according to the torque values in the table on the previous page.
Indoor unit tubing
Carefully bend the tubing in the middle. DO NOT bend the tubing more than
90° or more than three times.
After connecting the copper pipes to the indoor unit, wrap the power cable,
signal cable, and then the piping together with the binding signal tape. DO
NOT intertwine or cross the signal cable with other wires, while bundling these
items together.
Make sure the pipe is connected correctly. Overtightening may damage the bell mouth and under
tightening may lead to leakage.
Please
• Pipe run must be supported every 2 m
• R32 flammable refrigerant labels must be placed on the pipe every 2 m
• Insulate all the piping, including the valves of the outdoor unit.
20 |
Flare nut Pipe
note:
Torque wrench
Spanner
Bend the pipe
Minimum radius 10 cm