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IOM_WPHBA-WPHA_091a1201_207954_180610_EN
COMPACT HORIZONTAL PACKAGED WATER-TO-AIR UNITS
WPHBA / WPHA
INSTALLATION
THE HYDRAULIC CIRCUIT AND ITS COMPONENTS
The plate heat exchanger is the most fragile part of the hydraulic circuit. Therefore it is very important that the units provided
with a plate exchanger work in an open hydraulic circuit and in a closed thermal circuit within the control values as stated
in the following chart. The Langelier index shall not be exceeded (downwards or upwards) as in such a situation corrosive
or encrusting water may be produced. That would geopardize the component and the unit warranty would not apply. In
such a case a special exchanger suitable for this quality of water would be necessary.
Element contained in
water
Concentration by mg/l
Effects of a higher value
Effects of a lower value
Suspended solids
Variable
Can deteriorate the material
No effects are observed
Conductivity
≤ 500 µs/cm
No effects are observed
-
> 500 µs/cm
-
Not recommended
NH
3
Must be between 2 and 20
Not recommended
No effects are observed
Chlorides
≤ 300
-
No effects are observed
> 300
Corrosion
-
Iron
≤ 10
No effects are observed
-
> 10
-
Corrosion
Carbonic acids
Must be between 20 and 50
Corrosion
Not recommended
PH
Must be between 6 and 9
Corrosion
No effects are observed
Sulphates
Must be between 70 and 300
No effects are observed
Corrosion
Langelier
Must be between -0,5 and +0,5
Water with tendency to create
incrustations
Water with corrosive
tendency
Shut-off valves
Installed at the inlet and the outlet of each component, they allow to carry out the maintenance operations without having
to empty the installation.
Thermometers and pressure gauges
Installed at the inlet and the outlet of the main elements. They make maintenance and control operations easier.
Air release valves
Installed at the highest points of the installation. They enable air drainage of the circuit.
Drainage valves
Install them at all the low points to empty the circuit.
Supports
The weight of the pipes must not be supported by the connections of the unit. Therefore supporting rings shall be used.
Expansion vessel
It maintains the correct pressure of the installation, we recommend filling at 2.15 bar, when the water temperature varies
from cold to pump and vice versa. The expansion vessel has to be dimensioned according to the water content of the
installation.
In special circumstances it may be necessary to install one or more additional vessels even tif the unit already is equipped
with one.
Security devices
The installation of the following safety devices is
MANDATORY
when these elements
ARE NOT
included as standard
features. Not complying with this condition will entail the
LOSS OF WARRANTY
.
Water filter
At the water inlet of the unit, to protect the heat exchanger or other critical components from obstructions and/or clogging.
Flow switch
It aims at protecting the plate heat exchanger from breakage caused by a too low water flow that would make the equipment
completely inoperative.
