MAINTENANCE AND OPERATING MANUAL
Installation
HAS T 070÷140
44
ENGLISH
EN
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.
Desuperheaters pressure drops
4.3.4 Freeze protection
Even if the minimum working ambient temperature is higher than 0 °C, during shutdown periods in the winter season the unit
may be subject to temperatures that are lower than 0 °C. In such cases if the water circuit is not drained, to avoid ice
formation ethylene or propylene glycol antifreeze should be added to the water in the following percentages:
In summer, when the unit operates as a chiller, to avoid the formation of ice ethylene or propylene glycol antifreeze should be
added to the water in the following percentages in accordance with the chilled water outlet temperature:
With intake temperature control, the reference for the glycol percentage is equal to the setpoint less 6°C.
E.g. Setpoint 11.0 °C (reference for glycol 5 °C) recommended percentage 20%.
- The minimum recommended antifreeze % takes the coolant's operating conditions into consideration and is not strictly
dependant on the freezing point of the chilled water leaving the unit.
- The water flow rate must comply with the value stated in the performance technical data or the selection software.
Freeze protection setpoint set at 5°C.
For water outlet temperatures lower than 6 °C you must add a suitable quantity of antifreeze solution.
Ambient T up to [°C] Ethylene Glycol [% by weight] Propylene Glycol [% by weight]
000
-5 15 20
-10 25 30
-15 30 35
-20 40 40
water outlet T
up to [°C]
Ethylene or propylene glycol
[% by weight]
60
320
025
-5 30
-7 35
-10 40
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