Installing Air-Handling Components With Coil Connections - Denco CAIRplus Operation Manual

Installation
6.3

Installing air-handling components with coil connections

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
42
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.
Description
Hydrogen ion concentration
Calcium and magnesium content
Chlorine ions
Iron ions
Magnesium ions
Carbon dioxide
Hydrogen sulphate
Oxygen
Chlorine
Ammonia
Ratio carbons/sulphates
1/1.78 °D = 1 °Fr with 1 °Fr = 10 g CaCO
ppm = parts per million (mg/l)
ppb = parts per billion (μg/l)
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.
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.
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).
Symbol Values
−
pH 7.5
−
Hardness (Ca/Mg) 4 8.5 ×
–
Cl < 50 ppm
+
Fe³ < 0.5 ppm
+
Mg² < 0.05 ppm
CO < 10 ppm
2
H S < 50 ppb
2
O < 0.1 ppm
2
Cl < 0.5 ppm
2
NH < 0.5 ppm
3
- -
HCO ² /SO ² > 1
3 4
/m³
3
ATTENTION
PR-2009-0096-GB • Subject to modifications • R8-10/2015
CAIRplus
Effects in case of
difference
< 7 Corrosion
9
> 9 Incrustation
Δ
> 8.5 Incrustation
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
Corrosion
< 1 Corrosion