DencoHappel ZGF.1E series Operation Manual page 8

Safety and User Instructions
8
The following limit values apply to medium for operating Cu/Al heat exchangers:
Parameter
pH-value (at 20 °C)
Conductivity (at 20 °C)
Oxygen content
Total hardness
Dissolved sulphur
Sodium
Iron
Manganese
Ammonium content
Chloride
Sulphate
Nitrite
Nitrate
Tab. 1-1: Limit values for medium in closed heating and cooling circuits
EQUIPMENT DAMAGE!
In open systems (e.g. when using well water consider limit values from table
from Tab. 1-1), used water should additionally be cleansed of suspended mat-
ter using a filter to be installed at the inlet. Failure to do so could result in a risk
of erosion by suspended matter.
It must also be ensured that the unit is protected from dust and other sub-
stances that can cause acidic or alkaline reaction with water (aluminium corro-
sion).
It is not allowed to use Flex-Geko units, in particular with a cooling function, for
suction of kitchen exhaust air containing organic acids, e.g. vinegar. Besides, it
is not allowed to use cleaning agents, containing vinegar or other organic acids,
to clean rooms where such units are installed due to a substantial risk of acid-
related corrosion of aluminium fins!
The Flex-Geko may only be operated indoors.
The Flex-Geko units are designed for wall and ceiling installation.
The unit is considered to be used in an improper manner if it is applied for other
purposes or a purpose that is not covered by the scope of the given operation
manual. The manufacturer or supplier is not liable for any resulting damage: the
user alone bears the full risk.
The operator is responsible for proper use.
Proper use also stipulates the observance of the operation manual and the in-
spection and maintenance conditions defined by DencoHappel.
Unit
μS/cm
O mg/l
2
°dH
S
+
Na mg/l
2+ 3+
Fe , Fe mg/l
2+
Mn mg/l
+
NH mg/l
4
-
Cl mg/l
2-
SO mg/l
4
-
NO mg/l
2
-
NO mg/l
3
PR-2011-0115-GB • Subject to modifications • R4-12/2015
Flex-Geko Fan Coil Unit
Value
7.5 - 9
< 700
< 0.1
1 - 15
not detectable
< 100
< 0.1
< 0.05
< 0.1
< 100
< 50
< 50
< 50