12 WSAT-XIN 21-171 M0Q940G14-03
5 Water connections
5.1 Water quality
Water features
•
conrming to local regulations
•
total hardness < 14°fr
•
within the limits indicated by table
The water quality must be checked by qualied personnel.
Water with inadequate characteristics can cause:
•
pressure drop increase
•
reduces energy eciency
•
increased corrosion potential
Provide a water treatment system if values fall outside the limits.
The warranty does not cover damages caused by limestone formations, deposits and impurities
from the water supply and / or failure from failed system clearing to clean system.
5.2 Risk of freezing
If the unit or the relative water connections are subject to temperatures close to 0°C:
•
mix water with glycol, or
•
safeguard the pipes with heating cables placed under the insulation, or
•
empty the system in cases of long non-use
5.3 Anti-freeze solution
The use of an anti-freeze solution results in an increase in pressure drop.
Make sure that the glycol type utilized is inhibited (not corrosive) and compatible with the water circuit components.
Do not use dierent glicol mixture (i.e. ethylene with propylene).
5.4 Water ow-rate
The project water-ow must be:
•
inside the exchanger operating limits (see the TECHNICAL INFORMATION section)
•
guarantee, also with variable system conditions (for example in systems where some circuits are bypassed in particular situations).
Version: Premium
Size 21 31 41 51 71 81 91 101 121 131 141
Min. installation water contents litres 17 20 25 33 40 50 53 57 63 68 74
Version: Excellence
Size 21 31 41 51 71 81 91 101 121 131 141 151 161 171
Min. installation water
contents
litres 17 20 25 33 40 50 53 57 63 68 87 99 113 117
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