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10.4. Wiring of main power supply and equipment capacity
Schematic Drawing of Wiring (Example)
[Fig. 10.4.1] (P.5)
A Switch (breakers for wiring and current leakage)
D Pull box
Thickness of wire for main power supply, On/Off capacities and system impedance
P200
Heat source unit
P250
16 A or less
Total operating current
25 A or less
of the indoor unit
32 A or less
1. Use a separate power supply for the heat source unit and indoor unit.
2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.
3. 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 %.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords of parts of appliances for heat source use shall not be lighter than polychloroprene sheathed flexible cord (design 245 IEC57). For
example, use wiring such as YZW.
6. A switch with at least 3 mm contact separation in each pole shall be provided by the Air conditioner installation.
7. This device is intended for the connection to a power supply system with a maximum permissible system impedance shown in the above table at the
interface point (power service box) of the user's supply.
The user has to ensure that this device is connected only to a power supply system which fulfills the requirement above.
If necessary the user can the ash the public power supply company for the system impedance at the interface point.
Warning:
•
Be sure to use specified wires to connect so that no external force is imparted to terminal connections. If connections are not fixed firmly, it may cause
heating or fire.
•
Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.
Caution:
•
A breaker for current leakage must be attached to the power supply. If no earth leakage breaker is installed, it may cause an electric shock.
•
Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large capacity may cause a malfunction
of unit or fire.
11. Test run
11.1. The following phenomena do not represent trouble (emergency)
Phenomenon
Indoor unit and BC controller generate sound
at the cooling/heating change over sometime.
Indoor unit does not perform cooling (heat-
ing) operation.
The auto vane runs freely.
Fan setting changes during heating.
Fan stops during heating operation.
Fan does not stop while operation has been
stopped.
No setting of fan while start SW has been
turned on.
Indoor unit remote controller shows "HO" or
"PLEASE WAIT" indicator for about five min-
utes when turning ON universal power sup-
ply.
Drain pump does not stop while unit has been
stopped.
Drain pump continues to operate while unit
has been stopped.
14
B Heat source unit
E Indoor unit
2
Minimum wire thickness (mm
)
Main cable
Branch
Ground
4.0
4.0
4.0
4.0
4.0
4.0
1.5
1.5
1.5
2.5
2.5
2.5
4.0
4.0
4.0
Display of remote controller
Normal display
"Cooling (heating)" flashes
Normal display
Normal display
Defrost display
No lighting
Heat ready
"HO" or "PLEASE WAIT" flashes
Light out
C BC controller (main)
F Breakers for current leakage
Breaker for
Switch (A)
wiring (NFB)
Capacity
Fuse
25
25
30
25
25
30
16
16
20
25
25
30
32
32
40
This is not a trouble as it is just a selecting sound.
When multiple indoor units (max. 3) are connected to the same branch of the BC
controller, the heating (cooling) operation cannot be performed while another
indoor unit is performing a cooling (heating) operation.
Because of the control operation of auto vane, it may change over to horizontal
blow automatically from the downward blow in cooling in case the downward
blow operation has been continued for 1 hour. At defrosting in heating, hot adjust-
ing and thermostat OFF, it automatically changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostat OFF.
Light air automatically changes over to set value by time or piping temperature at
thermostat ON.
The fan is to stop during defrosting.
Fan is to run for 1 minute after stopping to exhaust residual heat (only in heating).
Ultra low-speed operation for 5 minutes after SW ON or until piping temperature
becomes 35°C, low speed operation for 2 minutes thereafter, and then set notch
is commenced. (Hot adjust control)
System is being driven.
Operate remote controller again after "HO" or "PLEASE WAIT" disappear.
After a stop of cooling operation, unit continues to operate drain pump for three
minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even during a
stop.
C '
BC controller (sub)
Max. Permissive
Breaker for current leakage
System Impedance
30 A 100 mA 0.1sec. or less
30 A 100 mA 0.1sec. or less
20 A 30 mA 0.1sec. or less
(apply to EN61000-3-3)
30 A 30 mA 0.1sec. or less
(apply to EN61000-3-3)
40 A 30 mA 0.1sec. or less
(apply to EN61000-3-3)
Cause
0.48 Ω
0.46 Ω
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