20
Carrier recommendations on heat exchange fluids:
•
No NH
4+
ammonium ions in the water, they are very
detrimental for copper. This is one of the most impor-
tant factors for the operating life of copper piping. A
content of several tenths of mg/l will badly corrode the
copper over time.
•
Cl
-
Chloride ions are detrimental for copper with a risk
of perforations by corrosion by puncture. If possible
keep below 125 mg/l.
•
SO
4
2-
sulphate ions can cause perforating corrosion, if
their content is above 30 mg/l.
•
No fluoride ions (<0.1 mg/l).
•
No Fe
2+
and Fe
3+
ions with non negligible levels of
dis-solved oxygen must be present. Dissolved iron < 5
mg/l with dissolved oxygen < 5 mg/l.
•
Dissolved silicon: silicon is an acid element of water
and can also lead to corrosion risks. Content < 1 mg/l.
•
Water hardness: > 0.5 mmol/l. Values between 1 and
2.5 can be recommended. This will facilitate scale deposit
that can limit corrosion of copper. Values that are too
high can cause piping blockage over time. A total
alkalimetric titre (TAC) below 100 mg/l is desirable.
•
Dissolved oxygen: Any sudden change in water
oxy-genation conditions must be avoided. It is as
detrimen-tal to deoxygenate the water by mixing it
with inert gas as it is to over-oxygenate it by mixing it
with pure oxygen. The disturbance of the oxygenation
conditions encourages destabilisation of copper
hydroxides and enlargement of particles.
•
Electric conductivity 10-600µS/cm.
•
pH: Ideal case pH neutral at 20-25°C
7 < pH < 8
7.2 - Water connections
The water connections are Victaulic type connections. The inlet and outlet connection diameters are identical.
Inlet/outlet diameters
Evaporator 30XW-V/30XWHV
580
630
810
880
1150
1280
1470
1570
1710
Units without option 100C
Connection
in
6
6
8
8
8
8
8
8
8
Outside diameter
mm
168.3
168.3
219.1
219.1
219.1
219.1
219.1
219.1
219.1
Units with option 100C
Connection
in
6
6
8
8
8
8
8
8
8
Outside diameter
mm
168.3
168.3
219.1
219.1
219.1
219.1
219.1
219.1
219.1
Condenser 30XW-V/30XWHV
580
630
810
880
1150
1280
1470
1570
1710
Units without option 102C
Connection
in
6
6
8
8
8
8
8
8
8
Outside diameter
mm
168.3
168.3
219.1
219.1
219.1
219.1
219.1
219.1
219.1
Units with option 102C
Connection
in
8
8
8
8
8
8
8
8
8
Outside diameter
mm
219.1
219.1
219.1
219.1
219.1
219.1
219.1
219.1
219.1
If the water circuit must be emptied for longer than one
month, the complete circuit must be placed under nitrogen
charge to avoid any risk of corrosion by differential aeration.
ATTENTION: Filling, completing and draining the water
circuit charge must be done by qualified personnel, using the
air purges and materials that are suitable for the products.
Charging and removing heat exchange fluids should be
done with devices that must be included on the water
circuit by the installer. Never use the unit heat exchangers
to add heat exchange fluid.
