Electrical Wiring; Types Of Control Cables - Mitsubishi Electric PFAV-P300VM-E-F Bedienungshandbuch

Be sure to perform this work before installing the unit.
(1) Remove the guard. (P250·P500 models: 3 screws)
(2) Remove the screw on the side you want to tilt the drain pan. (1 screw)
(3) Tilt down the side of the drain pan to which the screw was removed.
(Approximately 10 mm)
(4) Fix the screw you removed.
(5) Reattach the guard.
Note: If the drain pan is tilted, the drain pipe connected to the unit will also
be tilted (by approximately 0.5°).

7. Electrical wiring

 Do not connect outdoor units other than the specified type.
 Be sure to connect the indoor unit and outdoor unit on a one-to-one
basis.
Precautions on electrical wiring
* 10,11: For the Fresh air intake types only
Warning:
Electrical work should be done by authorized electrician in accordance
with local regulation and supplied installation manuals. Special circuits
should also be used. If the power circuit lacks capacity or has an
installation failure, it may cause a risk of electric 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
controller, transmission cables) is brought in direct contact with the power
cable outside the unit.
4. Ensure that there is no slack on all wire connections.
5. Be sure to pass the connection cables to the unit through an electrical
conduit, and ensure tension is not applied to the cable connection section of
the unit.
(* Do not insert the cable for the control circuit and the cable for the power
supply through the same electrical conduit.)
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.
10. Indoor unit is supplied with a temperature sensor. Install the sensor in the
room to properly control the room temperature.
By installing two MA Remote Controllers (sold separately) in the room, the
built-in sensor on the remote controllers can be used to monitor the room
temperature.
11. Supply air temperature sensor is built in on the inside of the indoor unit. A
jumper is taped inside the control box without it being connected to the
connector. Plug it into CN20 when using the supply air temperature to control
the room temperature. Turn SW 7-2 on the indoor unit to ON.
* When using the supply air temperature to control room temperature, it is not
necessary to take Step 10 above.
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.

Types of control cables

The control cables consist of the transmission cable for the indoor and outdoor
units, MA remote controller cable (when two remote controllers are used), and
M-NET transmission cable for the centralized control.
The types of cable and allowable lengths vary depending on the system
configuration. Be sure to refer to the installation manual of the outdoor unit before
beginning wiring work.
Caution:
Pipe the drain piping to ensure that it discharges drain, and insulate it to
prevent dew condensation. A failure to the piping work may cause water
leakage and so wet your property.
[Fig. 6.2.4] (P.6)
A Guard securing screws
1. Wiring transmission cables
Applicable facilities
Type
Cable type
Number of wires
Cable diameter
Maximum length of the transmission
cable for the indoor and outdoor units
Maximum length of transmission cable
for centralized control and transmission
cable for the indoor and outdoor units
(Maximum length when via the indoor
unit)
2. Remote controller cables
Type
Cable type
Number of wires
Cable diameter
Total length
Note: For the convenience of work, a cable diameter of up to 0.75 mm² is
recommended.
3. Temperature sensor wiring
Type
Cable type
Number of wires
Cable diameter
Maximum Total length
• If the supplied cable (12 m) needs to be extended, use the type of the cable
that meets the specifications in the table above, observing the maximum
cable length.
Refer to the Temperature Sensor Installation Manual and the instructions
detailed in the next section "7.3. Connecting electrical connections" for how to
install the temperature sensor.
• When extending the shielded cable, make sure the following conditions are
met:
(1) Keep the cable at least 30 cm away from power lines, which create strong
electric fields.
(2) Route the cable away from inverters, power generators, high-frequency
medical equipment, and radio communication equipment.
(3) Connect the shielded cable to the earth terminal on the indoor unit.
Conduit tube installation
• Close by hammering the knockout holes for the conduit tube located on the
side panel.
• When installing the conduit tube directly through the knockout holes, remove
the burr and protect the tube with masking tape.
• Use the conduit tube to narrow down the opening if there is a possibility of
small animals entering the unit.
B Drain pan securing screws
All facilities
Shielded cable
CVVS, CPEVS, MVVS
2-wire cable
1.25mm² or more
Maximum 200 m
Maximum 500 m
* The maximum length for the cable
from the power supply unit for the
transmission cable installed in the
centralized control to each outdoor
unit and system controller is 200 m.
MA remote controller
VCTF, VCTFK, CVV,
CVS, VVR, VVF, VCT
2-core cable
0.3 to 1.25mm² (Note)
Maximum 200 m
Shielded cable
CVVS, CPEVS, MVVS
2-core cable
Minimum 1.25mm²
Maximum 200 m
17