Outdoor Unit Installation; Pipe Connection - Mitsubishi Electric MSZ-GS18NA Installation Manual

3. Outdoor Unit Installation

1-4. Installation Diagram
3-1. Connecting Wires for the Outdoor Unit
Accessories
1) Remove the service panel.
Check the following parts before installation.
2) Remove the conduit cover.
<Indoor unit>
3) Attach the conduit connectors to the conduit plate with lock nuts then secure it against unit
with screws.
(1) Installation plate
4) Connect the ground wires of indoor/outdoor unit connecting wire (A) and power supply cord (K)
Attachment screws for the installa-
to the TB support.
(2) tion plate
5) Loosen the terminal screws, then attach indoor/outdoor unit connecting wire (A) and power
4 × 25 mm
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
(3) Wireless remote controller
connecting section of the terminal block.
(4) Felt tape (For left or left-rear piping)
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7) Install the conduit cover.
(5) Remote controller holder
8) Install the service panel securely.
Screws for the remote controller
(6) holder
3.5 × 16 mm (Black)
(7) Battery (AAA) for (3)
(8) Air cleaning filter
Service panel
Field-supplied parts
(A) Indoor/outdoor unit connecting wire*1
Lock nut
(B) Extension pipe
(C) Wall hole sleeve
(D) Wall hole cover
(E) Pipe attachment strap
(F) Screw for (E) 4 × 20 mm
(G) Piping tape
Conduit cover Conduit
(H) Putty
plate
Drain hose
(I)
(or soft PVC hose, 15 mm inner diam-
eter or hard PVC pipe VP30)
3-2. Flare Connection
Drain hose
(J)
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2) (or soft PVC hose, 15 mm inner diam-
eter or hard PVC pipe VP16)
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)
(K)
Power supply cord*1
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A
Note:
inch (mm) from the table according to the tool you use.
*1 Place indoor/outdoor unit connecting wire (A)
5) Check
and power supply cord (K) at least 3 feet (1 m)
• Compare the flared work with Fig. 6.
away from the TV antenna wire.
• If flare is defective, cut off the section and repeat procedure.
Units should be installed by licensed contractor
B
according to local code requirements.
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
21/32
ø 1/4 (6.35)
Note:
(17)
• The dimensions indicated in the arrows (
show the required space to guarantee performance of
7/8
ø 3/8 (9.52)
the air conditioner. Install the outdoor unit where the
(22)
0 to 0.02
maximum possible space can be provided, considering
(0 to 0.5)
1-1/32
later relocation, services, or repairs.
ø 1/2 (12.7)
(26)
• The cooling/heating performance and the efficiency of
power usage may fall about 10% at the place where
1-5/32
short cycle is likely occur due to poor ventilation. In-
ø 5/8 (15.88)
(29)
stalling the air outlet guide (optional) can improve per-
formances.
• If air from the outlet blows against the wall, it may

3-3. Pipe Connection

cause stains on the wall.
• Fasten flare nut with a torque wrench as specified in the table (refer to 3-2.).
• When fastened too tight, flare nut may eventually break and cause refrigerant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may
result in burns or frostbite.
Indoor unit connection
Do not take in the outlet air
Connect both liquid and gas pipings to indoor unit.
discharged by other units directly.
• Do not apply refrigeration oil on screw threads. Excessive tightening torque will result in
damage on the screw.
• To connect, first align the center, then tighten the first 3 to 4 turns of flare nut by hand.
• Use tightening torque table above as a guideline for indoor unit side joints, and tighten
using two wrenches. Excessive tightening damages the flare section.
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
Drain piping for outdoor unit
Install the unit horizontally.
1) Cover piping joints with pipe cover.
Do not use drain socket in cold regions. Drain may freeze and make the fan stop.
2) For outdoor unit side, insulate the piping, including valves.
The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unit and/or the grounds from being wet by drain
3) Apply piping tape (G) starting from the connection on the outdoor unit.
water or damaged by frozen drain water.
• When piping has to be installed through a ceiling, closet or where the temperature and
humidity are high, use additional field-supplied insulation to prevent condensation.
1
5
1
1
1
2
2
2
<MUZ-GS18NA(H)>
<MUY-GS18NA>
1
Terminal block
1
Conduit pipe
1
1
2 to 5
TB support
2 to 5
1
Indoor/outdoor unit
1
connecting wire (A)
1
0 or 1
1
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
) above
(1.5 to
*2 When front and sides of unit are clear, 20 inches (500
25 to 30
0.04 to
2.0) mm) or more
(350 to 420)
0.06
*3 When any 2 sides of left, right and rear of unit are clear,
(1.0 to
20 inches (500 mm) or more
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
Use the wall hole sleeve (C)
to prevent indoor/outdoor
connecting wire (A) from
contacting metal parts in
the wall and to protect the
wiring from rodents.
Lead
wire
• Make ground wire a little longer than others. (More than 3-7/8 inches [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
Indoor unit
19/32 inch
Wall hole
(15 mm)
sleeve (C)
Cut off the
extra length.
<MUZ-GS18NAHZ>
After the leak test, apply insulating material
Terminal block
tightly so that there is no gap.
Cover the connection part with tape to pre-
vent water from leaking.
When the piping is to be attached to a wall
comprised of tin plate or metal netting, use
chemically treated wooden piece 25/32 inch
TB support
to conduit cover
(20 mm) or thicker between the wall and the
piping, or wrap insulation vinyl tape around
the piping.
To use existing piping, perform COOL
operation for 30 minutes and pump down
Good
90°
before removing the old air conditioner.
Remake flare according to the dimension
Copper
pipe
for new refrigerant.
Do not block the inlet of the outdoor unit with
Fig. 1
the excess part of the pipes.
Copper pipe
Burr
Spare reamer
Pipe cutter
Flaring tool
Die
6-7/8
Flare nut
Wing nut type
Fig. 4
Smooth all around Inside is shining without any scratches.
2-3/8 x 13/16 slot
175
2-10 x 21 slot
Flare nut
Internal thread side
Tighten the flare nut
with a torque wrench.
Wall hole cover (D)
Seal the wall hole
gap with putty (H).
L1 L2
Attach the pipe to
wall with pipe at-
tachment strap (E).
Power supply cord (K)
Pipe attachment
strap (E)
Attachment
screw (F)
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Unit: inch
33-1/16
Copper pipe
19-11/16
Air inlet
Fig. 5
Air outlet
1-9/16
Unit: mm
Fig. 6
840
500
Air inlet
Air outlet
40
Union joint
External thread side
Grip the nut on the
union joint with a spanner.