Installation
CAIR
plus
42
PR-2009-0096-GB • Subject to modifications • R8-10/2015
6.3
Installing air-handling components with coil connections
Recommendations on water quality for heat exchangers operating with pumped
warm water and pumped chilled water:
Water in proper quality, e.g. salt and lime-free drinking water, considerably increases
the service life and efficiency of the heat exchanger.
•
Check the limit values
in the table
once a year
to prevent damage to the hydraulic
system and installed components. If necessary, add inhibitors to water.
Notice!
These limit values are
only intended to provide
basic information
on water quality
and do not form any
basis for a guarantee.
6.3.1 Installing air-handling components for cooling/heating applications
Consider the counter flow principle when connecting coils. (air and water moving in
opposite directions in the coil)
•
Protect the fins in the coils to prevent damage.
•
Connect pipework by others to the chilled water inlet and outlet. The inlet and outlet
coil connections are marked with labels.
•
Insulate pipework on site.
With air-handling components for cooling/heating applications, consider the
following:
•
Following installation insulate coil connections and pipework to prevent condensing
water.
9
Coil drip tray is made of stainless steel and collects forming condensate. The coil
drip tray is fitted with a drain connection to empty condensate.
•
Refer to the section on trap (see "Water drain trapping" on page 45).
Description
Symbol
Values
Effects in case of
difference
Hydrogen ion concentration
pH
7.5
−
9
< 7
> 9
Corrosion
Incrustation
Calcium and magnesium content
Hardness (Ca/Mg)
4
−
8.5 ×
Δ
> 8.5
Incrustation
Chlorine ions
Cl
–
< 50 ppm
Corrosion
Iron ions
Fe³
+
< 0.5 ppm
Corrosion
Magnesium ions
Mg²
+
< 0.05 ppm
Corrosion
Carbon dioxide
CO
2
< 10 ppm
Corrosion
Hydrogen sulphate
H
2
S
< 50 ppb
Corrosion
Oxygen
O
2
< 0.1 ppm
Corrosion
Chlorine
Cl
2
< 0.5 ppm
Corrosion
Ammonia
NH
3
< 0.5 ppm
Corrosion
Ratio carbons/sulphates
HCO
3
²
-
/SO
4
²
-
> 1
< 1
Corrosion
1/1.78 °D = 1 °Fr with 1 °Fr = 10 g CaCO
3
/m³
ppm = parts per million (mg/l)
ppb = parts per billion (
μ
g/l)
ATTENTION
Risk of damage to the unit!
•
When connecting the heat exchanger, counter hold with a pipe wrench to
prevent damage.
•
The connections to coils made by others on side must generally be tension-free.
Do not apply mechanical and static loads to the connection fittings.
