OPERATING AND MAINTENANCE MANUAL
Chapter 5 - Installation
iC 215 ÷ iC 780
24
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
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5.3 Freeze protection
Even if the minimum operating temperature is higher than 0°C, during shutdown periods in the cold season the unit may be
subject to temperatures that are lower than 0°C.
In such cases if the water is not drained out of the unit ethylene or propylene glycol antifreeze should be added to the water
in the following percentages:
In accordance with the chilled water outlet temperature, to avoid the formation of ice ethylene or propylene glycol antifreeze
should be added to the water in the following percentages:
The water flow rate must correspond to the value stated in the technical specifications or in the selection software.
The conditions specified in the table do not guarantee anti-freeze protection with the machine operating in bypass mode
between water delivery and return, and with the machine water inlet and outlet fittings shut off.
The anti-freeze setting is 4°C. To reduce the anti-freeze setting edit parameter AL26.
5.3.1 Operating limits
The operating limits are decided at the time of sale. Refer to the data specified in the contract.
For water outlet temperatures <= +5°C we recommend the use of anti-freeze solutions (compatible with the contact
materials);
(1) value referred to the unit chosen with the configurator option “-20°C ambient”. The unit is thus equipped with electronic
fans control and electrical cabinet heater.
If glycol is not used in the circuit it is advisable to equip the unit with anti-freeze heaters;
(2) reference value for the range with outlet water temperature of 15°C.
Ambient T up to
[°C]
Ethylene Glycol
[% by weight]
Propylene Glycol
[% by weight]
0 0 0
-5 15 18
-10 25 27
-15 30 33
-20 40 40
Water outlet T up to
[°C]
Ethylene Glycol
[% by weight]
Propylene Glycol
[% by weight]
Standard machine
7 0 0
3 20
20
0 20
25
-3 25
30
-5
30 30
-7 35
35
-10 35 40
Special machine
-15 45 45
-20 50 50
Ambient air temperature
Evaporator water
inlet temperature
Evaporator water
outlet temperature
Water temperature
gradient
Min Max Min Max Min Max Min Max
Fans control type
°C °C °C °C
-5
43
(2)
035-530
4 10 ON/OFF
5
43
(2)
-5 35 -10 30
-5
43
(2)
-5 35 -10 30
4 10 ELECTRONIC
-20
(1)
43
(2)
-5 35 -10 30
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