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6.3.1 Thermistor for gas pipe
Put the thermistor as close as possible to the branch pipe that is located the clos-
est to the gas pipe (header) connection on the evaporator (field supply).
Turn the lead wire of the thermistor downward, and wind the aluminum tape (field
supply) around the header to fix the thermistor.
Wind the insulation material over it.
Tighten the top and bottom of the insulation material using the supplied tie band.
Fold the lead wire of the thermistor at the bottom, and fix it with the insulation
material using the tie band.
[Fig. 6.3.1] (P.4)
A Heat exchanger (field supply)
C Thermistor (gas pipe)
E Insulation
7. Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accor-
dance with "Engineering Standards For Electrical Installation" and sup-
plied 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 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. Put the unit to the ground on the outdoor unit side.
9. Select control cables from the conditions given in page 10.
Transmission cable specifications
Type of cable
Cable diameter
Maximum length of transmission lines for centralized control and indoor/
outdoor transmission lines (Maximum length via indoor units): 500 m MAX
Remarks
The maximum length of the wiring between power supply unit for transmis-
sion lines (on the transmission lines for centralized control) and each out-
*1 Connected with simple remote controller.
10
B Gas pipe
D Aluminum tape (field supply)
F Tie band
Transmission cables
Shielding wire (2-core)
CVVS, CPEVS or MVVS
More than 1.25 mm
2
Max length: 200 m
door unit and system controller is 200 m.
6.3.2 Thermistor for liquid pipe
Put the thermistor on the coldest position to prevent the evaporator from freezing.
Turn the lead wire of the thermistor downward, and wind the aluminum tape (field
supply) around the pipe to fix the thermistor.
Wind the insulation material over it.
Tighten the top and bottom of the insulation material using the supplied tie band.
Fold the lead wire of the thermistor, and fix it with the insulation material using the
tie band.
[Fig. 6.3.2] (P.4)
A Heat exchanger (field supply)
C Thermistor (liquid pipe)
E Insulation
G Capillary tube
6.3.3 Thermistor for suction/discharge air
Attach the thermistor where the average suction/discharge air temperature of the
air handling unit can be detected.
[Fig. 6.3.3] (P.4)
A Thermistor (suction/discharge air)
B Clip
C Screw (field supply)
D Plate (field supply)
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 elec-
tric shock.
•
If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similayly qualified persons in order to avoid a haz-
ard.
Connecting wiring
[Fig. 7.0.1] (P.4)
A Outer cover
C Terminal block TB2
E Terminal block TB15
G Terminal block TB4
I To outdoor unit
K Distant signal (ON/OFF)
M Error signal
O Defrost signal
Q Thermistor (liquid pipe)
S Distant signal
U Transmission
W Thermistor (discharge air)
Wind the wire around the cable strap once to prevent loose wires as shown in the
figure.
ME Remote controller cables
Sheathed 2-core cable (unshielded) CVV
0.3 ~ 1.25 mm
2
(0.75 ~ 1.25 mm
2
)*1
When 10 m is exceeded, use cables with
the same specification as transmission
cables.
CVVS, MVVS : PVC insulated PVC jacketed shielded control cable
CPEVS : PE insulated PVC jacketed shielded communication cable
CVV : PVC insulated PVC sheathed control cable
B Gas pipe
D Aluminum tape (field supply)
F Tie band
B Inner cover
D Terminal block TB5
F Terminal block TBX
H Power supply (208 - 240 V)/Earth
J To remote controller
L Operation signal
N Fan signal
P Thermistor (gas pipe)
R LEV-kit
T Thermistor
V Thermistor (suction air)
MA Remote controller cables
0.3 ~ 1.25 mm
2
(0.75 ~ 1.25 mm
2
)*1
Max length: 200 m
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