Field Wiring: Overview; About The Electrical Wiring; Guidelines When Knocking Out Knockout Holes; To Route And Fix The Transmission Wiring - Daikin RXYTQ8T7YF Installer And User Manual

6 Installation
NOTICE
Only applicable if the power supply is three‑phase, and the
compressor has an ON/OFF starting method.
If there exists the possibility of reversed phase after a
momentary black out and the power goes on and off while
the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed
phase can break the compressor and other parts.
6.8.2

Field wiring: Overview

Field wiring consists of power supply (always including earth) and
indoor-outdoor communication (= transmission) wiring.
Example:
a
d d
i
c
b
h
a
b g
c
e e
h
h h
h f f
a Field power supply (with earth leakage protector)
b Main switch
c Earth connection
d Outdoor unit
e Indoor unit
f User interface
g Indoor power supply wiring (sheathed cable) (230 V)
h Transmission wiring (sheathed cable) (16 V)
i Outdoor power supply wiring (sheathed cable)
Power supply 3N~ 50/60 Hz
Power supply 1~ 50/60 Hz
Earth wiring
6.8.3

About the electrical wiring

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.
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 the inverter 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.
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 "6.4.3 To route the refrigerant piping" on
▪ 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.
Installer and user reference guide
28
d
h
g
e
h
h
f
page 18.
▪ 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).
a a a
B
A
b
b
a Outdoor unit
b Indoor unit
c Main line
d Branch line 1
e Branch line 2
f Branch line 3
g No branch is allowed after branch
h Central user interface (etc...)
A Outdoor/indoor transmission wiring
B Master/slave transmission wiring
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover user interface only.)
6.8.4 Guidelines when knocking out knockout
holes
▪ To punch a knockout hole, hit on it with a hammer.
▪ After knocking out the holes, we recommend removing any burrs
and paint the edges and areas around the holes using repair paint
to prevent rusting.
▪ When passing electrical wiring through the knockout holes.
prevent damage to the wires by wrapping the wiring with
protective tape, putting the wires through field supplied protective
wire conduits at that location, or install suitable field supplied wire
nipples or rubber bushings into the knockout holes.
a b c
a Knockout hole
b Burr
c Remove burrs
d If there are any possibilities that small animals enter the
system through the knockout holes, plug the holes with
packing materials (to be prepared on-site)
6.8.5

To route and fix the transmission wiring

Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
h
d
b
e
b
g
b
f
g
b
c
2
d
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388989-1B – 2016.02