Outdoor Unit Installation - Mitsubishi Electric MSZ-GS18NA Installation Manual

3. OUTDOOR UNIT INSTALLATION

3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connectors to the conduit plate with lock nuts then secure it against unit
with screws.
4) Connect the ground wires of indoor/outdoor unit connecting wire (A) and power supply cord (K)
to the TB support.
5) Loosen the terminal screws, then attach indoor/outdoor unit connecting wire (A) and power
supply cord (K) from the indoor unit correctly to the terminal block. Attach the wires to the
terminal block securely so that the cores cannot be seen, and no external force affects the
connecting section of the terminal block.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7) Install the conduit cover.
8) Install the service panel securely.
Service panel
Lock nut
Conduit cover Conduit
plate
3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to
avoid getting metal shavings into the piping. (Fig. 3)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A
inch (mm) from the table according to the tool you use.
5) Check
B
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
21/32
ø 1/4 (6.35)
(17)
7/8
ø 3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1-1/32
ø 1/2 (12.7)
(26)
1-5/32
ø 5/8 (15.88)
(29)
3-3. PIPE CONNECTION
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may
result in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
frigeration oil on screw threads. Excessive tightening torque will result in damage on the
screw.
• Use tightening torque table above as a guideline for indoor unit side joints, and tighten
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure
detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
When installing the unit, securely connect the refrigerant pipes before starting the
compressor.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature and
<MUZ-GS18NA(H)>
<MUY-GS18NA>
Terminal block
Conduit pipe
TB support
Indoor/outdoor unit
connecting wire (A)
A inch (mm) Tightening torque
Clutch Wing nut
ft-lb
type tool type tool
(kgf•cm)
for R22 for R22
10 to 13
0.06 to
(140 to 180)
0.08
(1.5 to
25 to 30
0.04 to
2.0)
(350 to 420)
0.06
(1.0 to
36 to 42
0.08 to
1.5)
(500 to 575)
0.10
(2.0 to
54 to 58
2.5)
(750 to 800)
WARNING
Lead
wire
• Make ground wire a little longer than others. (More than 3-7/8 in. [100 mm])
• For future servicing, leave some slack in the connecting wires.
• Be sure to attach each screw to its correspondent terminal when securing the
cord and/or the wire to the terminal block.
Grounding
terminal
Power supply cord (K)
to conduit cover
N•m
13.7 to 17.7
34.3 to 41.2
Clutch type
49.0 to 56.4
73.5 to 78.4
Even length all around
Indoor unit
connection
-
Outdoor unit
connection
19/32 in.
(15 mm)
<MUZ-GS18NAHZ>
Terminal block
TB support
to conduit cover
Good
90°
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Flaring tool
Die
Flare nut
Wing nut type
Fig. 4
Smooth all around Inside is shining without any scratches.
Flare nut
Internal thread side
with a torque wrench.
L1 L2
Power supply cord (K)
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Copper pipe
Fig. 5
Fig. 6
Union joint
External thread side
Grip the nut on the
union joint with a spanner.