6 Installation
Installer and user reference guide
31
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
NOTICE
Improper connections or installation may result in fire.
WARNING
▪ If the power supply has a missing or wrong N-phase,
equipment might break down.
▪ Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
▪ Install the required fuses or circuit breakers.
▪ Secure the electrical wiring with cable ties so that the
cables do NOT come in contact with sharp edges or
piping, particularly on the high-pressure side.
▪ Do NOT use taped wires, stranded conductor wires,
extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
▪ Do NOT install a phase advancing capacitor, because
this unit is equipped with an inverter. A phase
advancing capacitor will reduce performance and may
cause accidents.
WARNING
Keep power imbalance within 2% of the supply rating.
Large imbalance will shorten the life of the smoothing
capacitor. As a protective measure, the product will stop
operating and an error indication will be made, when power
imbalance exceeds 4% of the supply rating.
WARNING
▪ Always ground wires. (In accordance with national
regulations of the pertinent country.)
▪ Do not connect the ground wire to gas pipes, sewage
pipes, lightning rods, or telephone ground wires. This
may cause electric shock.
6.9.3
Field wiring: Overview
▪ Most field wiring on the unit is to be made on the terminal blocks
inside the electrical component boxes. To gain access to the
terminal blocks, remove the electrical component box service
panel. See
"6.2 Opening the units" on page 17
▪ Cable tie mountings are provided at the wiring entries of the
electrical component box.
The wiring diagram is delivered with the unit, located at the inside of
the switch box cover.
6.9.4
About the electrical wiring
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.
▪ 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.
▪ Transmission wiring to cool/heat selector: 500 m.
▪ Maximum number of independent interconnectable systems: 10.
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.)
6.9.5
To route and fix the power supply
To route and fix the power supply of the outdoor unit
▪ Route the power wiring and the transmission wiring through a
conduit hole.
▪ Route the power wiring though the upper hole in the left side plate,
from the front position of the main unit (through the conduit hole of
the wiring mounting plate), or from a knockout hole in the unit's
bottom plate.
a
b
c
d
e
f g
a
Electric wiring diagram (printed on the back of the electrical
component box lid)
b
Transmission wiring
c
Pipe opening
d
Conduit
e
Power wiring and ground wiring
f
Remove this part before use.
g
Through cover
To route and fix the power supply of the indoor unit
LV
LV
PS
PS
LV
PS
HV
PS
Power supply
HV
High voltage
LV
Low voltage
Guide the cables as much as possible through the provided cable
entry glands.
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 wirings should ALWAYS be
at least 50 mm.
