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Installation and operation manual
25
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
12.6. Routing
It is important to keep the power supply and the transmission wiring
separated from each other. In order to avoid any electrical
interference the distance between both wiring should always be at
least 25 mm.
12.6.1. Transmission wiring routing
The transmission wiring outside the unit should be wrapped and
routed together with the field piping.
Field piping can be routed from front or bottom of the unit (going left
or right). Refer to
"10.2. Connecting the refrigerant piping" on
page 17.
Rules for transmission wiring routing
Be sure to follow the limits below. If the unit-to-unit cables are
beyond these limits, it may result in malfunction of transmission:
- Maximum wiring length: 1000 m.
- Total wiring length: 2000 m.
- Maximum inter unit wiring length between outdoor units:
30 m.
- Transmission wiring to cool/heat selector: 500 m.
- Maximum number of branches: 16.
Maximum number of independent interconnectable systems: 10.
Up to 16 branches are possible for unit-to-unit cabling. No
branching is allowed after branching (see figure below).
1
Outdoor unit
2
Indoor unit
3
Main line
4
Branch line 1
5
Branch line 2
6
Branch line 3
7
No branch is allowed after branch
8
Central user interface (etc...)
A
Transmission wiring between outdoor unit and indoor
unit(s)
B
Transmission wiring between outdoor units
Never connect the power supply to transmission wiring terminal
block. Otherwise the entire system may break down.
Never connect 400 V to the terminal block of the transmission
wiring. Doing so will break the entire system:
- The wiring from the indoor units must be connected to the
F1/F2 (In-Out) terminals on the PC board in the outdoor unit.
- After installing the transmission wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in figure below.
1
Liquid pipe
2
Gas pipe
3
Insulator
4
Transmission wiring (F1/F2)
5
Finishing tape
For the above wiring, always use vinyl cords with 0.75 to
1.25 mm
2
sheath or cables (2-core wires). (3-core wire cables
are allowable for the cooler/heater changeover user interface
only.)
NOTICE
The above table indicates power specifications for
standard combinations.
If using anything other than the above combinations in a
multiple outdoor unit system, calculate using the following
procedure.
Calculate the recommended fuse capacity
Calculate, by adding the minimum circuit ampere of each
used unit (according to the table above), multiply the result
by 1.1 and select the next higher recommended fuse
capacity.
Example:
Combining the RXYQ30 by using the RXYQ8, RXYQ10,
and RXYQ12.
Minimum circuit ampere of the RXYQ8=16.1 A
Minimum circuit ampere of the RXYQ10=22.0 A
Minimum circuit ampere of the RXYQ12=24.0 A
Accordingly, the minimum circuit ampere of the
RXYQ30=16.1+22.0+24.0=62.1 A
Multiplying the above result by 1.1 (62.1 x 1.1)=68.31 A, so
the recommended fuse capacity would be
80 A
.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
NOTICE
Be sure to keep the power line and transmission line
apart from each other. Transmission wiring and power
supply wiring may cross, but may not run parallel.
Transmission wiring and power supply wiring may not
touch internal piping (except INV PCB cooling pipe) in
order to avoid wire damage due to high temperature
piping.
Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
1
1
1
A
B
2
2
2
2
2
2
8
5
6
7
7
4
3
1
2
3
4
5
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