D-EIMAC01207-15EN - 12/22
G EWAQ~G SR
model
Minimum water
flow
l/s
Maximum
water flow
l/s
EWAQ075G-SR
1.98
3.96
EWAQ085G-SR
2.28
4.56
EWAQ100G-SR
2.64
5.28
EWAQ110G-SR
2.88
5.76
EWAQ120G-SR
3.12
6.24
EWAQ140G-SR
3.72
7.44
EWAQ155G-SR
4.14
8.28
EWAQ~G XS
m
odel
EWAQ080G-XS
2.28
4.56
EWAQ090G-XS
2.58
5.16
EWAQ105G-XS
3.00
6.00
EWAQ115G-XS
3.36
6.72
EWAQ130G-XS
3.78
7.56
EWAQ150G-XS
4.26
8.52
EWAQ~G XR
model
EWAQ080G-XR
2.16
4.32
EWAQ090G-XR
2.46
4.92
EWAQ105G-XR
2.88
5.76
EWAQ115G-XR
3.18
6.36
EWAQ130G-XR
3.60
7.20
EWAQ150G-XR
4.02
8.04
To ensure correct operation of the unit, the flow of water
in the evaporator must fall within the operating sphere
specified in the preceding table and there must be a
minimum volume of water in the system.
The distribution circuits of the cold water should have a
minimum content of water to avoid an excessive
number of start-up and shut-downs of the compressor.
Every time the compressor goes into operation, an
excessive amount of oil from the compressor starts
circulating in the refrigerant circuit and at the same time
there is an increase of the temperature of the
compressor stator, generated by the inrush current of
the start-up. Therefore, to avoid damage to the
compressors, the application of a device has been
planned to limit frequent shut-downs and start-ups: in
one hour, there will only be 6 start-ups of the
compressor.
The system where the unit is installed must therefore
ensure that the overall content of water allows the unit
to operate continuously and therefore offers greater
environmental comfort. The minimum water content per
unit must be calculated approximately using the
following formula:
For 2 compressor units:
M (litres) = (12.153 x DT (°C)
– 22.168) x P(kW)
Where:
M = minimum content of water per unit expressed in
litres
P = refrigerating capacity of the unit express in kW
ΔT = difference in temperature of the incoming and
outgoing water, expressed in °C.
This formula is valid with the standard parameters of
the microprocessor. To determine most accurately the
quantity of water, we recommend contacting the
designer of the system.
Anti-freeze protection for evaporators and recovery
exchangers
When the entire system of the cooling installation is
being designed, two or more of the following anti-freeze
protection methods should be considered at the same
time:
1. Continuous circulation of water flow inside the
exchangers
2. Additional heat insulation and heating of exposed
piping
3. Emptying and cleaning the heat exchanger when it
is not in use and its maintenance in an anti-oxidant
atmosphere (nitrogen).
As an alternative, it is possible to add an
appropriate amount of glycol (antifreeze) to the
water circuit.
The installer and/or local personnel in charge of
maintenance, must make sure that anti-freeze
protection methods are in use and ensure that the
appropriate maintenance operations of the antifreeze
protection devices are always carried out. Failing to
follow the instructions above could result in damage to
the unit. Damage caused by freezing is not covered by
the guarantee.
Electrical system General specifications
The units must be connected to a TN power supply
system.
If the units must be connected to a different type of
power system, for example the IT system, please
contact the factory.
All the electrical connections to the unit must
be carried out in compliance with national laws
and European directives and regulations in
force.
All installation, running and maintenance activities must
be carried out by qualified personnel.
Refer to the specific wiring diagram for the unit
purchased. Should the wiring diagram not be on the unit
or should it have been lost, please contact the
manufacturer's representative who will send you a
copy.
In the event of any discrepancies between what is
written on the wiring diagram and a visual check of the
electric wires of the command and control panel,
contact the manufacturer representative.
Use only copper conductors to avoid overheating or
corrosion in the connection points, with resulting risk of
damage to the unit.
To avoid interference, all the command and control
cables must be connected separately from the power
cables, using more than one cable duct for this
purpose.
Before carrying out servicing work on the unit, close the
general disconnection switch located on the main power
supply.
WARNING
: If the unit is off but the disconnection switch
is in the open position, the circuits not being used are
still live.
Never open the compressor terminal board without first
having disconnected the unit main switch.
