Mitsubishi Electric MSZ-AY20VGK Notice D'installation page 7

3. Outdoor Unit Installation
3-1. Connecting Wires for the Outdoor Unit
1) Open the service panel.
2) Loosen terminal screw, and connect indoor/outdoor unit connecting wire (A)
from the indoor unit correctly on the terminal block. Be careful not to make
mis-wiring. Fix the wire to the terminal block securely so that no part of its core
is appeared, and no external force is conveyed to the connecting section of
the terminal block.
3) Firmly tighten the terminal screws to prevent them from loosening. After
tightening, pull the wires lightly to confirm that they do not move.
4) Connect power supply cord (K).
5) Fix indoor/outdoor unit connecting wire (A) and power supply cord (K) with the cord
clamp.
6) Close the service panel securely.
15 mm
35 mm
100 mm
15 mm
or more
35 mm
Others
Earth wire
<AY15>
Terminal block
Power supply
cord (K)
Cord clamp
Indoor/outdoor unit
connecting wire (A)
• Make earth wire longer than others as picture.
• For future servicing, give extra length to 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.
3-2. Flaring Work
1) Cut the copper pipe correctly with pipe cutter.
(Figure 1, 2)
2) Completely remove all burrs from the cut
cross section of pipe. (Figure 3)
• Put the end of the copper pipe to
downward direction as you remove burrs
in order to avoid to let burrs drop in the
piping.
3) Remove flare nuts attached to indoor and
outdoor units, then put them on pipe having
completed burr removal. (Not possible to put
them on after flaring work.)
4) Flaring work (Figure 4, 5). Firmly hold copper
pipe in the dimension shown in the table.
Select A mm from the table according to the
tool you use.
5) Check
• Compare the flared work with Figure 6.
• If flare is noted to be defective, cut off the flared section and do flaring
work again.
Copper pipe
Burr
Spare reamer
Pipe cutter
Figure 3
Copper pipe
Die
Flare nut Figure 5
Power supply cord (K)
<AY20>
Terminal block
Always fix the power supply
cord on this clamp.
Copper
pipe
Figure 1
No good
Good
Tilted Uneven Burred
Figure 2
Flaring tool
Clutch type Wing nut type
Figure 4
Inside is shining with-
out any scratches.
Smooth all
around
Even length Figure 6
all around
A (mm)
Clutch
Clutch
Pipe diameter Nut
type
type
(mm) (mm)
tool
for
for R22
R410A
ø 6.35 (1/4") 17
ø 9.52 (3/8") 22 1.0 to
0 to 0.5
ø12.7 (1/2") 26
ø15.88 (5/8") 29
3-3. Pipe Connection
• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may break after a long period and cause
refrigerant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
• Use flared nut installed to this indoor unit.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Do not apply refrigeration oil on screw threads. Excessive tightening torque
will result in damage on the screw.
• For connection, 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 union
joint section, and tighten using two wrenches. Excessive tightening damages
the flare section.
5 mm or less
Flare nut
Internal thread side
Tighten the flare nut
with a torque wrench.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same manner
applied for indoor unit.
• For tightening, use a torque wrench or spanner and use the same tightening
torque applied for indoor unit.
Warning
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, surely insulate every piping including valves.
3) Using piping tape (G), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (G) with tape (with adhesive agent at-
tached).
• When piping have to be arranged through above ceiling, closet or where
the temperature and humidity are high, wind additional commercially
sold insulation to prevent condensation.
Tightening torque
Wing
nut type
N•m kgf•cm
tool tool
for R22
13.7 to 17.7 140 to 180
1.5 to
2.0
34.3 to 41.2 350 to 420
1.5
2.0 to 49.0 to 56.4 500 to 575
2.5
73.5 to 78.4 750 to 800
Union joint
External thread side
Grip the nut on the
union joint with a spanner.
EN-6
EN