Confirming Drain Discharge; Electrical Wiring; Cables - Mitsubishi Electric City Multi PDFY-P-NMU-E Manuel D'installation

7.3. Confirming drain discharge

Make sure that the drain-up mechanism operates normally for dis-
charge and that there is no water leakage from the connections.
• Be sure to confirm the above in a period of heating operation.
• Be sure to confirm the above before ceiling work is done in the case of a new
construction.
1. Plug the enclosed connector into the red connector (2P) on the side of the
control box.
2. Remove the polyethylene plug on the same side as the indoor unit piping.

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 ceil-
ing may be bitten by mouses. Use as many metal pipes as possible to insert
the cables into them for protection.
6. Never connect the power cable to leads for the transmission cables. Other-
wise the cables would be broken.
7. Be sure to connect control cables to the indoor unit, remote controller, and
the outdoor unit.
8. Select control cables from the conditions given in page 10.
10
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 incom-
plete, water may flow over the machine.)
4. Turn on the main power. The drain pump is forced to operate without any
remote 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)
Insert the pump's end 2 to 4 cm [13/16 to 1-19/32 in].
Remove the polyethylene plug.
About 1000 cc
Filling port
Caution:
Be sure to ground the indoor unit. Do not connect the grounding cable to
any gas pipe, water pipe, lightening rod, or telephone earth cable. Incom-
plete grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
• Types of transmission cables: Shielding wire CVVS or CPEVS
• Cable diameter: More than 1.25 mm
• Maximum wiring length: Within 200 m [656ft]
• Maximum length of transmission lines for centralized control and indoor/out-
door transmission lines (Maximum length via indoor units): 500 m [1640ft]
MAX
The maximum length of the wiring between power supply unit for transmis-
sion lines (on the transmission lines for centralized control) and each outdoor
unit and system controller is 200 m [656ft]
2. Remote control cables
• M-NET Remote Controller
Kind of remote control cable
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
When 10 m [32ft] is exceeded, use cable
Remarks with the same specifications as 1. Wiring
transmission cables.
• MA Remote Controller
Kind of remote control cable
0.3 to 1.25 mm
Cable diameter
(0.75 to 1.25 mm
Remarks Within 200 m [656ft]
* Connected with simple remote controller.
Water
2
[AWG16]
Sheathed 2-core cable (unshielded)
2
[AWG22 to 16]
2
[AWG18 to 16])*
Sheathed 2-core cable (unshielded) CVV
2
[AWG22 to 16]
2
[AWG18 to 16])*