Electrical Wiring; Power Supply Wiring - Mitsubishi Electric PLFY-P20VLMD-E Installationshandbuch

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1. Remove the polyethylene plug on the same side as the indoor unit piping.
2. Fill water into the feed water pump using a feed water tank. In filling, be sure to
put the end of the pump or tank in a drain pan. (If the insertion is incomplete,
water may flow over the machine.)
3. Perform the test run in cooling mode, or turn on the switch SWE on the control-
ler circuit board. (The drain pump and the fan are forced to operate without any
remote controller operation.) Make sure using a transparent hose that drain is
discharged.
SWE SWE
OFF ON OFF ON
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1. Plug the drain pump test connector (accessory) into the connector on the same
side as the control box. For more details, see the information on the control box
cover.
2. Remove the polyethylene plug on the same side as the indoor unit piping.
3. Fill water into the feed water pump using a feed water tank. In filling, be sure to
put the end of the pump or tank in a drain pan. (If the insertion is incomplete,
water may flow over the machine.)

8. Electrical wiring

Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accord-
ance with "Engineering Standards For Electrical Installation" and supplied
installation manuals. Special circuits should also be used. If the power cir-
cuit lacks capacity or has an installation failure, it may cause a risk of elec-
tric shock or fire.
1. Be sure to take power from the special branch circuit.
2. Be sure to install an earth leakage breaker to the power.
3. Install the unit to prevent that any of the control circuit cables (remote control-
ler, transmission cables) is brought in direct contact with the power cable out-
side the unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by mouses. Use as many metal pipes as possible to insert the
cables into them for protection.
Transmission cable specifications
Type of cable
Cable diameter
Maximum length of transmission lines for centralized control and indoor/
outdoor transmission lines (Maximum length via indoor units): 500 m MAX
Remarks
The maximum length of the wiring between power supply unit for
transmission lines (on the transmission lines for centralized control) and
each outdoor unit and system controller is 200 m.
*1 Connected with simple remote controller.

8.1. Power supply wiring

• Use dedicated power supplies for the indoor unit.
• Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
• The wire size is the minimum value for metal conduit wiring. If the voltage drops, use a wire that is one rank thicker in diameter. Make sure the power-supply voltage does
not drop more than 10%.
• Specific wiring requirements should adhere to the wiring regulations of the region.
• Power supply cords of appliances shall not be lighter than design 245 IEC 57, 227 IEC 57, 245 IEC 53 or 227 IEC 53.
• A switch with at least 3 mm contact separation in each pole shall be provided by the Air conditioner installation.
[Fig. 8.1.1] (P.4)
A Ground-fault interrupter
B Local switch/Wiring breaker
C Indoor unit
D Pull box
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
More than 1.25 mm 2
Max length: 200 m
4. After confirmation, cancel the test run mode, and turn off the main power.
When the switch SWE has been turned on, turn it off, and insert the polyethylene
plug into its original position.
SWE SWE
OFF ON OFF ON
4. Turn on the main power. The drain pump is forced to operate without any re-
mote controller operation. Make sure using a transparent hose that drain is
discharged.
5. After confirmation, turn off the main power, remove the connector, and insert
the polyethylene plug into its original position.
[Fig. 7.3.1] (P.4)
A Insert the pump's end 2 to 4 cm.
C About 1000 cc
E Filling port
6. Never connect the power cable to leads for the transmission cables. Otherwise
the cables would be broken.
7. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
8. Put the unit to the ground on the outdoor unit side.
9. Select control cables from the conditions given in below.
Caution:
• Be sure to put the unit to the ground on the outdoor unit side. Do not
connect the earth cable to any gas pipe, water pipe, lightening rod, or
telephone earth cable. Incomplete grounding may cause a risk of electric
shock.
• If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualified persons in order to avoid a hazard.
ME Remote controller cables
Sheathed 2-core cable (unshielded) CVV
0.3 ~ 1.25 mm 2
2
(0.75 ~ 1.25 mm )*1
When 10 m is exceeded, use
cables with the same specifica-
tion as transmission cables.
CVVS, MVVS: PVC insulated PVC jacketed shielded control cable
CPEVS: PE insulated PVC jacketed shielded communication cable
CVV: PVC insulated PVC sheathed control cable
B Remove the polyethylene plug.
D Water
MA Remote controller cables
0.3 ~ 1.25 mm 2
2
(0.75 ~ 1.25 mm )*1
Max length: 200 m
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