Connect Pipes - INVENTOR V5MFI-66 User & Installation Manual

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 to the ared
ends of the pipes.
2. Align the center of the two pipes that you
will connect.
Indoor unit tubing
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 table .
NOTE: Use both a spanner and a torque
wrench when connecting or disconnecting
pipes to/from the unit.
CAUTION
Ensure to wrap insulation around the piping.
•
Direct contact with the bare piping may
result in burns or frostbite.
Make sure the pipe is properly connected.
•
Over tightening may damage the bell mouth
and under tightening may lead to leakage.
 Page 32 
Flare nut
Pipe
NOTES ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle
according to the diagram below. DO NOT
bend the tubing more than 90° or more than
3 times.
Bend the pipe with thumb
min-radius 10cm (3.9")
6. After connecting the copper pipes to the
indoor unit, wrap the power cable, signal
cable and the piping together with
binding tape.
NOTE: DO NOT intertwine signal cable
with other wires. While bundling these items
together, do not intertwine or cross the
signal cable with any other wiring.
7. Thread this pipeline through the wall and
connect it to the outdoor unit.
8. Insulate all the piping, including the valves
of the outdoor unit.
9. Open the stop valves of the outdoor unit
to start the ow of the refrigerant between
the indoor and outdoor unit.
CAUTION
Check to make sure there is no refrigerant
leak after completing the installation work.
If there is a refrigerant leak, ventilate the area
immediately and evacuate the system (refer
to the Air Evacuation section of this manual).