40MUAA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
Use the following steps to connect the refrigerant piping:
1. Run the interconnecting piping from the outdoor unit to the indoor
unit.
2. Connect the refrigerant piping and drain line outside the indoor unit.
Complete the pipe insulation at the flare connection then fasten the
piping and wiring to the wall as required. Completely seal the hole in
the wall.
3. Cut tubing to correct length.
When preparing refrigerant pipes, take extra care to cut and flare
them properly. This ensures efficient operation and minimizes the
need for future maintenance.
a. Measure the distance between the indoor and outdoor units.
b. Using a pipe cutter, cut the pipe a little longer than the measured
distance.
c. Make sure the pipe is cut at a perfect 90° angle.
A220805
Fig. 30 —Pipe Cutting
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.
A220806
Fig. 31 —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.
A220807
Fig. 32 —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 Table 5.
h. Remove the flaring tool and flare block, then inspect the end of the
pipe for cracks and even flaring.
Fig. 33 —Flare Shape
Table 5 — Flare Nut Spacing
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.
8. Align the center of the two pipes that you will connect.
A220815
Fig. 34 —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.
DO NOT
install the connecting pipe until both the indoor and
outdoor units have been installed.
Insulate suction line to prevent condensation.
CAUTION
Oblique Rough Warped
90°
DO NOT DEFORM PIPE WHILE CUTTING
Be extra careful not to damage, dent, or deform the pipe while
cutting. This drastically reduces the heating efficiency of the unit.
CAUTION
Pipe
Reamer
Point down
Pipe Gauge
Tightening Torque
Flare Dimension (A)
(Unit: MM/Inch)
Min
Max
3/8 in
(Ø9.52)
25-25 N.m
(18-19 ft-lb)
13.2/0.52
13.5/0.53
3/4 in
(Ø19)
65-67 N.m
(48-49 ft-lb)
23.2/0.91
23.7/0.93
7/8 in
(Ø22)
75-85 N.m
(55-63 ft-lb)
26.4/1.04
26.9/1.06
Flare nut
Copper pipe
R0.4~0.8
45
qr
2
90
q
r
4
A
Pipe
Indoor unit tubing
Flare nut
