45MBCAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Table 5 — 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 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.
Fig. 25 —Align Center of Pipes
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.
Fig. 26 —Connect Pipes to/from 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.
Pipe Gauge Tightening Torque Flare Dimension (A) Flare Shape
Ø1/4”
(Ø6.35MM)
13.25 -14.75 ft-lbs
(18 - 20 N.m)
0.33~0.34"
(8.4~8.7mm)
Ø3/8”
(Ø9.52MM)
23.6 - 28.75 ft-lbs
(32 - 39 N.m)
0.52~0.53"
(13.2~13.5mm)
Ø1/2”
(Ø12.7MM)
36 - 43.5 ft-lbs
(49 - 59 N.m)
0.64~0.65"
(16.2~16.5mm)
Φ5/8in
(Φ16mm)
42 - 52.4
(57 - 71 N.m)
0.76~0.78in
(19.2~19.7mm)
Φ3/4in
(Φ19mm)
49.4 - 74.5
(67-101 N.m)
0.91~0.93in
(23.2~23.7mm)
Indoor unit tubing
Flare nut
Pipe
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
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