D-EIMWC01206-15EN - 9/20
EWWQ180L
5.38
11.21
EWWQ205L
6.17
12.86
EWWQ230L
7.01
14.61
EWWQ260L
7.82
16.30
EWWQ290L
8.70
18.13
EWWQ330L
9.89
20.60
EWWQ380L
11.11
23.14
EWWQ430L
12.35
25.73
EWWQ480L
13.66
28.46
EWWQ540L
15.77
32.86
EWWQ600L
17.56
36.58
EWWQ660L
19.06
39.71
EWWQ720L
20.74
43.21
EWLQ Model
Minimum water
flow
l/s
Maximum
water flow
l/s
EWLQ090G
2.50
5.21
EWLQ100G
2.85
5.94
EWLQ120G
3.19
6.65
EWLQ130G
3.61
7.53
EWLQ150G
4.02
8.38
EWLQ170G
4.61
9.61
EWLQ190G
5.24
10.91
EWLQ210G
5.90
12.30
EWLQ240G
6.61
13.76
EWLQ300G
8.39
17.48
EWLQ360G
10.00
20.83
EWLQ180L
4.97
10.36
EWLQ205L
5.67
11.81
EWLQ230L
6.42
13.38
EWLQ260L
7.13
14.86
EWLQ290L
8.00
16.68
EWLQ330L
9.09
18.94
EWLQ380L
10.37
21.60
EWLQ430L
11.75
24.48
EWLQ480L
13.16
27.43
EWLQ540L
14.69
30.60
EWLQ600L
16.40
34.16
EWLQ660L
17.92
37.33
EWLQ720L
19.43
40.49
EWHQ Model
Minimum water
flow
l/s
Maximum
water flow
l/s
EWHQ100G
3.80
7.91
EWHQ120G
4.19
8.74
EWHQ130G
4.77
9.94
EWHQ150G
5.41
11.26
EWHQ160G
5.98
12.45
EWHQ190G
6.83
14.24
EWHQ210G
7.80
16.25
EWHQ240G
8.95
18.64
EWHQ270G
9.94
20.71
EWHQ340G
12.51
26.06
EWHQ400G
14.82
30.88
To ensure the 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.
In fact, 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 damages 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 t
operate continuously and therefore greater
environmental comfort. The minimum water content per
unit must be calculated with a certain approximation
using the following formula:
For units with 2 compressors:
M(litres) = (12.153 x DT (°C)
– 22.168) x P(kW)
For units with 4 compressors:
M(litres) = (0.32 x DT (°C) +1,36) 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 or heating
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 the flow of water inside the
exchangers
2. Additional heat insulation and heating of exposed
piping
3. Emptying and cleaning of the heat exchanger during
the winter and its maintenance with 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 the local personnel assigned to
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 unit damage. Damage
caused by freezing is not covered by the warranty.
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, management and maintenance activities
must be carried out by qualified personnel.
