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8. Electrical wiring
8.1. Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers
in accordance with "Engineering Standards For Electrical Instal-
lation" and supplied installation manuals. Special circuits should
also be used. If the power circuit lacks capacity or has an instal-
lation 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 (Re-
mote 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.
8.2. Types of control cables
1. Wiring M-NET transmission cables
•
Types of transmission cables
Design wiring in accordance with the following table <Table 1>.
•
Cable cross-sectional area 1.25 mm
<Table 1>
System configuration
Transmission cable length
Facility example
Residence or independent
(for noise judgment)
store without noise
VCTF, VCTFK, CVV, CVS,
Types of transmission
VVR, VVF, VCT or shielding
cables
wire CVVS or CPEVS
2. Remote controller cables
Wire Type
Number of
conductors
Wire diameter
Total Length
Note1 For work purposes, a wire diameter of 0.75 mm
Note2 If you are running the wires to the PAC-SE51CRA terminal block, use the wire diameter shown in (
12
2
to 2.00 mm
2
For a single-refrigerant system
Less than 120 m
Building, clinic, hospital or communi-
cations station without noise suppos-
edly generated from inverter equip-
ment, private power generator, high-
frequency medical equipment, radio-
used communications equipment and
so on
MA Remote controller
(PAR-20MAA)
VCTF, VCTFK, CVV, CVS,
Type
VVR, VVF, VCT
0.3 ~ 1.25 mm
2
(Note 1)
Max. 200 m
2
is recommended.
5. Some cables (power, Remote controller, transmission cables) above
the ceiling may be bitten by mice. Use as many metal pipes as
possible to insert the cables into them for protection.
6. Never connect the power supply cable to leads for the transmis-
sion cables. Otherwise the electronic circuit would be broken.
7. Be sure to connect control cables to the Fresh Master, 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 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, lighten-
ing rod, or telephone earth cable. Incomplete grounding may cause
a risk of electric shock.
Shielding wire CVVS or CPEVS
(PAR-F27MEA, PAC-SE51CRA)
10 m or shorter
VCTF, VCTFK, CVV, CVS,
VVR, VVF, VCT
2-conductor cable
2
0.3 ~ 1.25 mm
(Note 1)
(0.75 ~ 1.25 mm
2
)(Note 2)
Max. 10 m
For a multi-refrigerant system
More than 120 m
Regardless of length
All facilities
ME Remote controller
If the length exceeds 10 m.
M-NET transmission cable
If the length exceeds 10 m, keep
the length within the maximum
length of communications lines
between indoor and outdoor
units.
).
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