37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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B. REFRIGERANT CONNECTION
INSTRUCTION
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 the 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.
Fig. 15 —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.
Fig. 16 — 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 factory flare nut on pipe facing the proper direction. Make
sure they are facing the right direction. Once the ends are flared, it
is impossible to put them on or change their direction.
Fig. 17 — 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.
Fig. 18 — Flare Block
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 10.
Table 10 — Flare Nut Spacing
Fig. 19 — Flare Nut Spacing
h. Remove the flaring tool and flare block, then inspect the end of
the pipe for cracks and even flaring.
6. Connect the Pipes
Connect the copper pipes to the indoor unit first, then connect the
pipes to the outdoor unit. Connect the low-pressure pipe first, then
connect the high pressure pipe.
a. Align the center of the two pipes that you will connect.
DO NOT DEFORM PIPE WHILE CUTTING
Be extra careful not to damage, dent, or deform the pipe while
cutting. This will drastically reduce the heating efficiency of the unit.
CAUTION
OUTER DIAMETER IN (MM)
A” IN (MM)
MIN. MAX.
Ø 1/4in (Ø 6.35mm) 0.0275in (0.7mm) 0.05in (1.3mm)
Ø 3/8in (Ø 9.52mm) 0.04in (1.0mm) 0.063in (1.6mm)
Ø1/2in (Ø 12.7mm) 0.04in (1.0mm) 0.07in (1.8mm)
Ø 5/8in (Ø 16mm) 0.078in (2.0mm) 0.086in (2.2mm)
Ø 3/4in (Ø 19mm) 0.078in (2.0mm) 0.094in (2.4mm)
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