Specifications

Installation and operation manual
24
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
1 Electrical component box cover
2 Front side
3 Power supply terminal block
4 Sealing material
5 Moisture and dirt could enter
X Not allowed
O Allowed
12.5. Requirements
The power supply must be protected with the required safety devices,
i.e. a main switch, a slow blow fuse on each phase and an earth
leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
If the total transmission wiring exceeds these limits, it may result in
communication error.
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.
Minimum circuit
ampere
Recommended
fuses
RXYQQ8 16.1 A 20 A
RXYQQ10 22.0 A 25 A
RXYQQ12 24.0 A 32 A
RXYQQ14 27.0 A 32 A
RXYQQ16 31.0 A 40 A
RXYQQ18 35.0 A 40 A
RXYQQ20 39.0 A 50 A
RXYQQ22 46.0 A 63 A
RXYQQ24 46.0 A 63 A
RXYQQ26 51.0 A 63 A
RXYQQ28 55.0 A 63 A
RXYQQ30 59.0 A 80 A
RXYQQ32 62.0 A 80 A
RXYQQ34 66.0 A 80 A
RXYQQ36 70.0 A 80 A
RXYQQ38 76.0 A 100 A
RXYQQ40 81.0 A 100 A
RXYQQ42 84.0 A 100 A
For all models:
Phase and frequency: 3N~ 50 Hz
Voltage: 380-415 V
Transmission line section: 0.75~1.25 mm
2
, maximum length is 1000 m.
INFORMATION
Multi units are standard combinations.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
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