Midea MFYA400-24HRFN8-QRD0W User Manual page 77

Step 4: Connect pipes
Connect the copper pipes to the indoor unit first,
then connect it to the outdoor unit. You should
first connect the low-pressure pipe, then the
highpressure pipe.
When connecting the flare nuts, apply a thin
•
coat of refrigeration oil to the flared ends of
the pipes.
•
Align the center of the two pipes that you will
connect.
Indoor unit tubing
• Tighten the flare nut snugly by hand.
• Using a wrench, grip the nut on the unit tubing.
• While firmly gripping the nut, use a torque
wrench to tighten the flare nut according to
the torque values in above table.
NOTICE
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.
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.
Use appropriate tool
min-radius 10cm(3.9 )
• 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.
•
Thread this pipeline through the wall and
connect it to the outdoor unit.
• Insulate all the piping, including the valves
of the outdoor unit.
•
Open the stop valves of the outdoor unit
to start the flow 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).
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