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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.
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 page
10
.
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
Design wiring in accordance with the following table <Table 1>.
•
Cable diameter
More than 1.25 mm
2
[Fig. 7.2.2] (P.4)
A:
25 cm
B:
1.5 – 2 m
A
Downward pitch of more than 1/100
F
Insulating material
G
Metal brace
[Fig. 7.2.3] (P.4)
H
Take as large as possible. About 10 cm
[Fig. 7.2.4] (P.4)
C:
within 41 cm
G
Drain hose (Accessory)
s
s
s
s
s
Be sure to use the supplied drain hose (Accessory).
H
Less than 300 mm
I
Hard vinyl chloride 90
°
elbow (field supply)
J
Hard vinyl chloride (VP-25) (field supply)
K
Tie band (small) (Accessory)
L
170
±
5 mm
M
Hose band (Accessory)
s
s
s
s
s
Connect each connection with vinyl chloride adhesive. But never use
any adhesive over the indoor unit discharge port. Otherwise the drain-up
mechanism cannot be serviced later. Also, the end connection may be
eroded by resin and so cracked.
1.
Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way.
(
3
)
2. Ensure that any cross-wise drain piping is less than 20 m (excluding the differ-
ence of elevation). If the drain piping is long, provide metal braces to prevent it
from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
3. Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm) for
drain piping.
4. Ensure that collected pipes are 10 cm lower than the unit body’s drain port as
shown in
4
.
5.
Do not provide any odor trap at the drain discharge port.
6. Put the end of the drain piping in a position where no odor is generated.
7. Do not put the end of the drain piping in any drain where ionic gases are
generated.
8. The intake of the drain piping can be made 41 cm higher than the drain dis-
charge port. If there are some obstacles under the ceiling, use elbows to make
it at least height according to the site. (
5
)
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:
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.
7.3. Confirming drain discharge
s
s
s
s
s
Make sure that the drain-up mechanism operates normally for discharge
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.
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.)
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.
B
Remove the polyethylene plug.
C
About 1000 cc
D
Water
E
Filling port
<Table 1>
System configuration
For a single-refrigerant system
For a multi-refrigerant system
Transmission cable length
Less than 120 m
More than 120 m
Regardless of length
Facility example
(for noise judgment)
Types of transmission
cables
Residence or independent store
without noise
VCTF, VCTFK, CVV, CVS, VVR,
VVF, VCT or shielding wire
CVVS or CPEVS
Building, clinic, hospital or communications
station without noise supposedly generated
from inverter equipment, private power gen-
erator, high-frequency medical equipment,
radio-used communications equipment and
so on
All facilities
Shielding wire CVVS or CPEVS
Length
Less than 120 m
Less than 200 m
