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45MBCAQ: Installation Instructions
8. Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring.
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.
3. Tighten the flare nut snugly by hand.
4. Using a 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 above table.
NOTE: Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from the unit.
6. Bend the tubing.
NOTE: 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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 5 — Piping Extension Beyond Flare Form
Pipe Gauge
Tightening Torque
Ø1/4"
13.25 -14.75 ft-lbs
(Ø6.35MM)
(18 - 20 N.m)
Ø3/8"
23.6 - 28.75 ft-lbs
(Ø9.52MM)
(32 - 39 N.m)
Ø1/2"
36 - 43.5 ft-lbs
(Ø12.7MM)
(49 - 59 N.m)
Φ5/8in
42 - 52.4
(Φ16mm)
(57 - 71 N.m)
Φ3/4in
49.4 - 74.5
(Φ19mm)
(67-101 N.m)
Indoor unit tubing
Fig. 25 —Align Center of Pipes
Fig. 26 —Connect Pipes to/from 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 Dimension (A)
Flare Shape
0.33~0.34"
(8.4~8.7mm)
0.52~0.53"
(13.2~13.5mm)
0.64~0.65"
(16.2~16.5mm)
0.76~0.78in
(19.2~19.7mm)
0.91~0.93in
(23.2~23.7mm)
Pipe
Flare nut
(Bigger
Torque wrench
20
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