6 Preparation
Installer reference guide
26
EWAQ+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
▪ Because 140 l is more than 66 l, the expansion vessel is NOT
appropriate for the installation. Therefore the system requires an
external expansion vessel.
6.4
Preparing electrical wiring
6.4.1
About preparing electrical wiring
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
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
▪ All wiring must be performed by an authorized
electrician and must comply with the applicable
legislation.
▪ Make electrical connections to the fixed wiring.
▪ All components procured on the site and all electrical
construction
must
comply
with
the
applicable
legislation.
WARNING
The backup heater MUST have a dedicated power supply
and MUST be protected by the safety devices required by
the applicable legislation.
WARNING
ALWAYS use multicore cable for power supply cables.
6.4.2
About preferential kWh rate power supply
Electricity companies throughout the world work hard to provide
reliable electric service at competitive prices and are often
authorized to bill clients at benefit rates. E.g. time-of-use rates,
seasonal rates, Wärmepumpentarif in Germany and Austria, ...
This equipment allows for connection to such preferential kWh rate
power supply delivery systems.
Consult with the electricity company acting as provider at the site
where this equipment is to be installed to know whether it is
appropriate to connect the equipment in one of the preferential kWh
rate power supply delivery systems available, if any.
When the equipment is connected to such preferential kWh rate
power supply, the electricity company is allowed to:
▪ interrupt power supply to the equipment for certain periods of time;
▪ demand that the equipment only consumes a limited amount of
electricity during certain periods of time.
Control box EKCB07CAV3 is designed to receive an input signal by
which it switches the outdoor unit into forced-off mode. At that
moment, the compressor will not operate.
Whether the power supply is interrupted or not, the wiring to the unit
is different.
6.4.3
Overview of electrical connections except
external actuators
Normal power
supply
Preferential kWh rate power supply
Power supply is
NOT interrupted
Power supply is
interrupted
580
1 50
0
0
a
2
3
5
1
4
f
e
c
d
580
1 50
0
0
f
5
1
4
3
6
2
e
b
d c
During preferential
kWh rate power
supply activation,
power supply is NOT
interrupted. The
outdoor unit is turned
off by the control.
Remark:
The
electricity company
must always allow the
power consumption
of the hydro part of
the outdoor unit (and
of the control box, if
part of the system).
580
1 50
0
0
580
1 50
0
0
a
b
f
e
c
d
3
2
6
7
1
5
4
During preferential
kWh rate power
supply activation,
power supply is
interrupted
immediately or after
some time by the
electricity company.
In this case, the
hydro part of the
outdoor unit (and the
control box, if part of
the system) must be
powered by a
separate normal
power supply.
a
Normal power supply
b
Preferential kWh rate power supply
c
Hydro part of the outdoor unit
d
Refrigerant part of the outdoor unit
e
Control box
f
Backup heater kit
1
Power supply for outdoor unit
2
Interconnection cable to control box
3
Interconnection cable to backup heater kit
4
Power supply for control box
5
Power supply for backup heater kit
6
Preferential kWh rate power supply (voltage free contact)
7
Normal kWh rate power supply (to power the hydro part of
the outdoor unit in the event of a power supply interruption
of the preferential kWh rate power supply)
6.4.4
Overview of electrical connections for
external and internal actuators
The following illustration shows the required field wiring.
INFORMATION
The following illustration is an example and might NOT
match your system layout.
