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3. Do not provide any odor trap at the drain discharge port.
4. Put the end of the drain piping in a position where no odor is generated.
5. Do not put the end of the drain piping in any drain where ionic gases are
generated.
6. Check drainage by pouring water into the drain pan and check to see that it
drains properly.
7. Check for ease of operation of the fault detection float switch in the drain pan,
and breakage of leads.
8. Provide a drain trap to the drain piping installed on site.
* The loop on the drain hose provided with the unit does not function as a trap;
it is only used to drain water to the main drain pan at the bottom of the prod-
uct.
7. 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.
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 con-
nect 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
1. Wiring transmission cables
•
Types of transmission cables
Shielding wire (2-core)
CVVS or CPEVS <max length: 200 m>.
•
Cable diameter
2
More than 1.25 mm
2. Remote controller cables
Types of cables
2-core cable (unshielded)
Cable diameter
0.3 to 1.25 mm
Length
Less than 200 m
7.1. Power supply wiring
Model
Power supply
Power supply wiring cross-section
Earth wiring cross-section
Earth leakage
Type <capacity>
breaker
Rated sensitivity
Wiring breaker (NFB)
Note:
1. Bear in mind ambient conditions (ambient temperature,direct sunlight,
rain water,etc.) when proceeding with the wiring and connections.
2. The wire size is the minimum value for metal conduit wiring. The power
cord size should be 1 rank thicker consideration of voltage drops.
Make sure the power-supply voltage does not drop more than 10 %.
MA remote controller
2
PFD-P250VM-A
PFD-P500VM-A
380 - 415V
2.5 mm
2
4.0 mm
2
2
2
2.5 mm
4.0 mm
20 A
30 A
30 mA less than 0.1 s
20 A
30 A
Note:
If the rise portion is long, there will be a lot of returned water in an operation
stop, generating slime or odor during off-season. Ensure that the rise por-
tion is at a minimum.
Caution:
Always prepare the water seal by filling the trap with water from the drain
pan during test operation. Inject water into the drain trap during the periodic
check (six-monthly) to check water-sealing. If the trap is not filled with water,
it will cease to function and this may result in leaks.
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.
3. Specific wiring requirements should adhere to the wiring regulations of
the region.
4. Wiring cross-sections noted are the minimum values for metal and plas-
tic wiring conduits (containing up to three cables).
•
Power supply cords of appliances shall not be lighter than design 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.
Caution:
1. Use only breakers and fuses of the correct capacity. Use of larger capac-
ity fuses, or wire may result in a fault and smoke or flames.
2. Wire the power supply so that no tension is imparted. Otherwise discon-
nection, heating or fire result.
7.2. Connecting remote controller, indoor
and outdoor transmission cables
•
Connect indoor unit TB5 and outdoor unit TB3. (Non-polarized 2-wire)
The "S" on indoor unit TB5 is a shielding wire connection. For specifications
about the connecting cables, refer to the outdoor unit installation manual.
•
Do not connect the indoor unit terminal block (TB5) to another indoor unit ter-
minal block (TB5) that is connected to a different outdoor unit.
•
If it is a Model 500, always ensure the connection between each outdoor unit
passes across the "A" and "B" pins (TB7) of the central controller's transmis-
sion cable terminal block. (See Fig. 7.4.2.)
•
The shielded grounding wire for the central controller's transmission cable must
pass across the S pin of the central controller's transmission cable terminal
block (TB7) of each outdoor unit.
•
When a feeding device is not connected to the central controller's transmission
cable, replace the feed switching connecter of a single outdoor unit (CN41)
with CN40. In this case, the shielded grounding wire for the central controller's
transmission cable connects the S terminal block of the terminal block of a
single outdoor unit (TB7) that had its connector replaced to CN40, to the ground-
ing screw
.
•
When a feeding device is connected to the central controller's transmission
cable, the shielded grounding wire of the central controller's transmission ca-
ble must be grounded with the
feed switching connector (CN41) of the outdoor unit is not replaced.
•
Install a remote controller following the manual supplied with the remote con-
troller.
•
Connect the "1" and "2" on indoor unit TB15 to a MA remote controller. (Non-
polarized 2-wire)
[Fig. 7.2.1] (P.3) MA Remote controller
<A> Model 250
<B> Model 500
A Terminal block for indoor transmission cable
B Terminal block for outdoor transmission cable
C MA Remote controller
•
DC 9 to 13 V between 1 and 2 (MA remote controller)
[Fig. 7.2.2] (P.3) MA Remote controller
<A> Model 250
<B> Model 500
A Non-polarized
C Lower level
Note:
1. Ensure that the wiring is not pinched when fitting the terminal box cover.
Pinching the wiring may cut it.
2. Put the transmission cable earth via the outdoor unit's earth terminal
to the ground.
pin of the feeding device. In this case, the
B Upper level
D MA Remote Controller
9
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