Outdoor Unit Installation; Indoor/Outdoor Unit Connection Finishing And Test Run; Flaring Work - Mitsubishi Electric MS12 Installation Manual

5. OUTDOOR UNIT INSTALLATION

5-1 POWER SUPPLY AND INDOOR AND OUTDOOR
WIRE CONNECTION
•
Connect the indoor/outdoor unit connecting wire A from the indoor unit correctly on
the terminal block.
•
For future servicing, give extra length to connecting wire.
Connect wires to the matching
numbers of terminals.
Terminal block
MU12/15/17TN
Remark:
∗ Indoor unit can also be
powered from an
independent power
supply [Max. Fuse size
(time delay) : 15 A].
In this case these
indoor/outdoor
DC12 V (Polar)
connecting wires for
indoor power supply are
not necessary.
∗∗ A disconnect switch may
be required.
Check the local code.
MUH12/15TN
Remark:
∗ Indoor unit can also be
powered from an
independent power supply
[Max. Fuse size (time
delay) : 15 A].
In this case these indoor/
outdoor connecting wires
DC12 V (Polar)
for indoor power supply
are not necessary.
∗∗ A disconnect switch may
be required.
Check the local code.
CONNECTING WIRES
• Wire to be AWG22 double insulated, 300 V insulation. Equal to Belden 9407
(for 12 V DC).
• Use copper conductors only.
•
Be careful not to make mis-wiring.
•
Firmly tighten the terminal screws to prevent them from loosening.
•
After tightening, pull the wires lightly to confirm that they do not move.
•
If the connecting wire is incorrectly connected to the terminal block, the unit does
not operate normally.
•
If a ground is incorrect, it may cause an electric shock.
Loosen terminal screw.
Lead wire
<Connection details>
Grounding
INDOOR UNIT
terminal
Terminal block
2 1 N L1
∗∗
Disconnect switch
115V AC ∗
1phase, 60Hz
Grounding
Terminal
block 1 terminal
2 1 N L1 L1 L2 N
Terminal block 2
OUTDOOR UNIT
Ground
Power supply
208/230V AC, 1phase 3wires, 60Hz
Grounding
INDOOR UNIT
terminal
Terminal block
3 1 N L1
∗∗
Disconnect switch
115V AC ∗
1phase, 60Hz
Grounding
Terminal
block 1
terminal
3 1 N L1 L1 L2 N
Terminal block 2
OUTDOOR UNIT
Ground
Power supply
208/230V AC, 1phase 3wires, 60Hz
CAUTION
5-2 GROUNDING
•
Remove the service panel.
•
Fix the conduit connector to conduit cover with lock nut then secure it against unit
with screw.
•
Leave some slack in wires to allow easier servicing.
MU12TN and MUH12TN
Lock nut
Service panel
Grounding
terminal
MU15/17TN and MUH15TN
Service panel
Grounding
terminal
Use care so as connecting wires do not contact pipes.
Be sure to attach the service panel of the outdoor unit securely. If it is not attached
correctly, it could result in a fire or an electric shock due to dust, water, etc.
6. INDOOR/OUTDOOR UNIT CONNECTION
FINISHING AND TEST RUN

6-1 FLARING WORK

•
Main cause of gas leakage is defect in flaring work.
Perform flaring work correctly in the following procedure.
1 Pipe cutting
• Cut the copper pipe correctly with pipe cutter.
Copper pipe
2 Burrs removal
• Completely remove all burrs from the cut cross section of the pipe.
• Put the end of the copper pipe downward to prevent burrs from dropping in the pipe.
Copper pipe
Burr
Connector
Conduit cover
Lock nut
Connector
Conduit
cover
CAUTION
WARNING
No good
Good
90° Tilted Uneven Burred
Spare
reamer
Pipe
cutter