Kaisai KFS-48HRG32X, Owners & Installation Manual, Page: 33 / 56

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
high-pressure pipe.
1. When connecting the flare nuts, apply a
thin coat of refrigeration oil to the flared
ends of the pipes.
2. Align the center of the two pipes that you
will connect.
Indoor unit tubing Flare nut Pipe
3. Tighten the flare nut as tightly as possible
by hand.
4. Using a spanner, grip the nut on the unit
tubing.
5. While firmly gripping the nut, use a torque
wrench to tighten the flare 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.
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.
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).
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 flow of the refrigerant between
the indoor and outdoor unit.
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”)
•
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.
CAUTION
CAUTION
EN
33