Carrier 40MBAB Installation Instructions Manual page 13

40MBAB: Installation Instructions
4. Remove Burrs
Burrs can affect the air-tight seal of the refrigerant piping connection.
Therefore, they must be completely removed. To remove:
a. Hold the pipe at a downward angle to prevent burrs from falling
into the pipe.
b. Using a reamer or deburring tool, remove all burrs from the cut
section of the pipe.
Point down
Fig. 34 —Deburring tool
5. Flare Pipe Ends
Proper flaring is essential to achieving an airtight seal.
a. After removing the burrs from the cut pipe, seal the ends with PVC
tape to prevent foreign materials from entering the pipe.
b. Sheath the pipe with insulating material.
c. Place flare nuts on both ends of the pipe. Ensure they are facing the
right direction. Once the ends are flared, it is impossible to put
them on or change their direction.
Flare nut
Copper pipe
Fig. 35 —Copper pipe and flare nut
d. Remove the PVC tape from ends of pipe when ready to perform the
flaring work.
e. Clamp the flare block on the end of the pipe. The end of the pipe
must extend beyond the flare form.
f. Place the flaring tool onto the form.
g. Turn the handle of the flaring tool clockwise until the pipe is fully
flared. Flare the pipe in accordance with the dimensions in
h. Remove the flaring tool and flare block, then inspect the end of the
pipe for cracks and even flaring.
Fig. 36 —Flare Shape
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Pipe
Reamer
4
90
A
R0.4~0.8
Pipe Gauge In (mm)
Ø 1/4" (6.35)
Ø 3/8" (9.52)
Ø 1/2" (12.7)
Ø 5/8" (15.9)
Ø 7/8" (22)
6. Connect the Pipes
Connect the copper pipes to the outdoor unit first, then connect the
pipes to the indoor unit. Connect the low-pressure pipe first, then
connect the high pressure pipe.
7. When connecting the flare nuts, apply a thin coat of refrigeration oil
to the flared ends of the pipes.
A220806
8. Align the center of the two pipes that you will connect.
Indoor unit tubing
Fig. 37 —Align the center of the two pipes
9. Tighten the flare nut as much as possible by hand.
10. Using a wrench, grip the nut on the unit tubing.
11. While firmly gripping the nut, use a torque wrench to tighten the
flare nut. See Table 7.
NOTE: Use both a backup wrench and a torque wrench when
connecting or disconnecting pipes to or from the unit.
A220807
Table 7
.
Fig. 38 —Torque wrench with backup wrench
All tubing bends should be performed with a properly sized tubing bender
to prevent kinking or damaging the tubing.
12. After connecting the copper pipes to the outdoor unit, wrap the
power cable, signal cable and the piping together with binding tape.
NOTE: While bundling these items together, DO NOT intertwine or
cross the signal cable with any other wiring.
13
Table 7 — Flare Nut Spacing
Tightening Torque
18-20 N.m 0.33/8.4
32-39 N.m 0.52/13.2
49-59 N.m 0.64/16.2
57-71 N.m 0.76/19.2
85-110 N.m 1.04/26.4
Flare nut
Flare Dimension (A)
(Unit: In/mm)
Min Max
0.34/8.7
0.53/13.5
0.65/16.5
0.78/19.7
1.06/26.9
Pipe
A220815
A220813