40MBFAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
Step 3 - Flare Pipe Ends
Proper flaring is essential to achieving an airtight seal.
1. After removing burrs from 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 are nuts on both ends of pipe. Ensure they are facing in the right
direction, because you can not put them on or change their direction
after flaring.
Fig. 6 — Flare Pipe Ends
4. Remove PVC tape from the pipe ends 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 flare form.
Fig. 7 — Clamp Flare Form
6. Place the flaring tool onto the form.
Table 5 — Specifications
7. Turn the flaring tool handle clockwise until the pipe is fully flared.
Flare the pipe in accordance with the dimensions.
Table 6 — Piping Extension Beyond Flare Form
8. Remove the flaring tool and flare form, then inspect the end of the pipe
for cracks and even flaring.
Step 4 - Connect the Pipes
Connect the copper pipes to the indoor unit first, then connect them to the
outdoor unit. 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 to connect.
Fig. 8 — Align the Pipes
3. Tighten the flare nut as tight as possible by hand.
4. Use an adjustable wrench, 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 6 on page 8.
NOTE: Use an adjustable wrench and a torque wrench when
connecting or disconnecting pipe to or from the unit.
Fig. 9 — Torque fittings
NOTE: Carefully bend the tubing in the middle. DO NOT bend the
tubing more than 90 degrees or more than three times.
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 flow of the
refrigerant between the indoor and outdoor unit.
NOTE: After connecting the piping, wrap the connecting pipe head
with the insulation pipe in the accessory package.
OUTER DIAM.
IN.(MM)
IN. (MM)
MAX. MIN.
Ø1/4” (6.35) 0.05 (1.3) 0.03 (0.7)
Ø3/8” (9.52) 0.06 (1.6) 0.04 (1.0)
Ø1/2” (12.7) 0.07 (1.8) 0.04 (1.0)
Pipe
Gauge
Tightening
Torque
Flare Dimensions
(A) (Unit: In/mm)
Flare Shape
1/4”
(
6.35)
13.27-14.75 lbsf-ft
(180-200kgf.com)
0.33
/8.4
0.37
/8.7
3/8”
(9.52)
23.6-28.8 lbsf-ft
(320-390kgf.cm)
0.52/
13.2
0.53/
13.5
1/2”
(
12.7)
36.14-43.52 lbsf-ft
(490-590kgf.cm)
0.64/
16.2
0.65/
16.5
Indoor unit tubing
Flare nut
Pipe
• Be sure to wrap the insulation around the piping. Direct contact with
the bare piping may result in burns or frostbite.
• Ensure the pipe is properly connected. Over tightening may damage the
bell mouth and under tightening may lead to leakage.
CAUTION
Ensure 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).
CAUTION
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